JP2007298065A - Diaphragm valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diaphragm valve improved in sealability, which is used for a long time without damaging a diaphragm even after continuous opening and closing operations. <P>SOLUTION: The diaphragm valve comprises: a valve body 1 having an inlet passage 3, an outlet passage 4, and a partition wall 5 which is located between both passages 3, 4 and curves the passages; a bonnet 15 mounted on the valve body 1; a compressor 14 which is supported by the bonnet 15 and is fixed to the lower end of a stem 18 to be engaged with a driving portion; and a diaphragm 9 which is fixed to the compressor 14, and is held between the valve body 1 and the bonnet 15, and has a line shape projecting portion 10 to be brought into pressure contact with the partition wall 5 and to be separated therefrom, and an annular projecting portion 11 to be brought into pressure contact with the portion around an opening portion 2 of the upper surface of the valve body 1 formed thereon. In this case, at least one projecting portion 12 having a width smaller than that of the line shape projecting portion 10 is provided on the line shape projecting portion 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a diaphragm valve used in a transportation piping line for various fluids (water, pure water, corrosive chemicals, etc.). More specifically, the present invention can improve sealing performance and perform continuous opening and closing. The present invention relates to a diaphragm valve that can be used for a long time without damaging the diaphragm.

  Conventional diaphragm valves and their seal structures are as shown in FIGS. 11 and 12 (see, for example, Patent Document 1). This configuration includes an opening 101 and a valve body 103 having a valve seat 102 facing the opening 101, a diaphragm 104 that seals the opening 101, a bonnet 105 that sandwiches the diaphragm 104 with the valve body 103, and a diaphragm 104 and a compressor 106 that moves the diaphragm 104 up and down along a guide groove provided in the bonnet 105 to separate or seat the diaphragm 104 with respect to the valve seat 102, and an annular protrusion on the sandwiched portion of the diaphragm 104. The annular ridge 107 is formed on the sandwiched portion of the diaphragm 104 on the liquid contact surface, and the seal zone 108 having the same height as the annular ridge 107 is formed on the annular ridge 107. It was formed outside 107. The valve seat 102 of the diaphragm valve is formed of a bottom surface portion 110 provided lower than the opening portion 101 and an arcuate slope portion 111 rising from the bottom surface portion 110 toward the opening portion 101, and the diaphragm 104 is provided on the valve seat 102. The linear protrusion 109 was pressed. The effect was to eliminate not only leakage inside the pipeline but also leakage outside the pipeline when the pressure fluid was fully closed.

Japanese Utility Model Publication No. 2-47325

  However, the seal structure of the conventional diaphragm valve shown in FIG. 11 has a configuration in which the linear protrusion 109 is pressed against the valve seat 102, and the linear protrusion 109 deteriorates when used for a long time while performing continuous opening and closing. In particular, the bottom surface portion 110 of the valve seat 102 of the linear protrusion 109 and the portion pressed against the curved surface portion 112 between the bottom surface portion 110 and the inclined surface portion 111 are deteriorated because they are pressed against the valve seat 102 so as to be strongly crushed. There is a problem that the linear protrusion 109 may be damaged easily. Further, the valve seat 102 of the diaphragm valve is post-processed to smooth the surface of the valve seat 102 in order to achieve a stable seal, but normally the valve body 103 of the diaphragm valve is rotated around the spindle axis direction. Therefore, the curved surface portion 112 is formed in a concave shape instead of a flat surface due to the nature of the lathe processing, and the intersection between the rising surface of the valve seat 102 and the curved surface is slightly projected (see FIG. 5 curved surface portion). At this time, when the linear protrusion 109 of the diaphragm 104 is pressed against the valve seat 102 so as to be strongly crushed, the intersecting portion of the curved surface portion 112 comes into contact with the surface around the linear protrusion 109 of the diaphragm 104 and is continuously opened and closed. As a result, the contact portion between the intersecting portion and the surface of the linear protrusion 109 is damaged, which may cause fluid leakage. This can be improved by providing a roundness at the intersection, but it has to be processed by a machining center, and there is a problem that the processing cost is increased due to labor and time. The above problem is more likely to occur when the valve seat 102 is deeply provided by increasing the height of the upper surface portion of the valve body 103 and the bottom surface portion 110 of the valve seat 102.

  The present invention has been made in view of the above-described problems of the prior art, and provides a diaphragm valve that improves sealing performance and can be used for a long period of time without being damaged even when continuously opened and closed. The purpose is to do.

  The configuration of the diaphragm valve of the first invention of the present application for solving the above-described problems will be described with reference to the drawings. The inlet channel 3, the outlet channel 4, and the channels 3, 4 are positioned between the channels. A valve body 1 having a partition wall 5 that bends, a bonnet 15 attached to the valve body 1, a compressor 14 supported by the bonnet 15 and fixed to a lower end of a stem 18 that engages with a drive unit, and a compressor An annular ring 10 that is fixed to 14 and sandwiched between the valve body 1 and the bonnet 15 and pressed against and separated from the upper surface of the partition wall 5 and the periphery of the opening 2 on the upper surface of the valve body 1. In the diaphragm valve comprising the diaphragm 9 formed with the ridge 11, the linear ridge 10 is provided with at least one ridge 12 having a width smaller than that of the linear ridge 10. One special To.

  A second feature is that the protruding portion 12 is provided at a position symmetrical with respect to the entirety of the linear protruding portion 10 or the flow path axis.

  The upper surface of the partition wall 5 of the valve body 1 has a flat bottom surface portion 6 provided lower than the opening portion 2, a tapered or arcuate slope portion 7 rising from the bottom surface portion 6 toward the opening portion 2, It is formed by the curved surface portion 8 between the bottom surface portion 6 and the slope portion 7, and the ridge is located at a position of the linear ridge portion 10 facing the bottom surface portion 6 and / or the curved surface portion 8 of the partition wall 5. The third feature is that the portion 12 is provided.

  The cross-sectional shapes of the linear protrusions 10 and the protrusions 12 are substantially semicircular arcs, and the height of the protrusions 12 is 0.05 W to 0.00 mm with respect to the minimum width W of the upper surface of the partition wall 5. The fourth characteristic is that the width of the ridge 12 is 0.2 to 0.9 times the width of the linear ridge 10 within the range of 15 W.

  The diameter D of the opening 2 of the valve body 1 and the height H between the upper surface of the valve body 1 and the bottom of the partition wall 5 are provided in the range of H = 0.18D to 0.31D. Five features.

  A sixth feature is that a thick portion 31 is provided on the linear protrusion 10.

A seventh feature is that the driving unit is a manual type, an air driven type or an electric driven type.

  Further, the configuration of the second invention of the present application will be described in the same manner as described above. The inlet channel 3, the outlet channel 4, and the partition wall 5 that is located between both the channels 3 and 4 and curves the channel. A valve body 1, a bonnet 15 attached to the valve body 1, a compressor 14 supported by the bonnet 15 and fixed to a lower end of a stem 18 that engages with a drive unit, and a valve body that is fixed to the compressor 14 and fixed to the compressor 14. 1 and a bonnet 15 are formed, and a linear ridge portion 10 pressed against and separated from the upper surface of the partition wall 5 and an annular ridge portion 11 pressed against the periphery of the opening 2 on the upper surface of the valve body 1 are formed. In the diaphragm valve comprising the diaphragm 9, a groove portion 36 is provided on the liquid contact surface located on both sides of the linear protrusion 10 in parallel with the linear protrusion 10, and the upper surface of the partition wall 5 is closed when the valve is closed. Intersection of rising surface 21 22 is a first feature that it does not contact the groove bottom 37.

  The diameter D of the opening 2 of the valve body 1 and the height H between the upper surface of the valve body 1 and the bottom of the partition wall 5 are provided in the range of H = 0.18D to 0.31D. Two features.

  A third feature is that a thick portion 31 is provided on the linear protrusion 10.

  A fourth feature is that the driving unit is a manual type, an air driving type, or an electric driving type.

  In the first invention of the present application, the ridge portion 12 is a portion that is formed to have a width smaller than the linear ridge portion 10 of the diaphragm 9 and that protrudes from the apex portion of the linear ridge portion 10. is there. It is desirable that the ridge portion 12 is provided at a certain height with respect to the apex portion of the linear ridge portion 10 or is provided in a mountain shape by gradually changing the height. Further, the ridge portion 12 may be provided at least in one stage with respect to the linear ridge portion 10 and may be provided in multiple stages. However, in order to maintain a strength that is not easily damaged, the ridge portion 12 is provided in one stage. It is preferable to provide it. Further, the ridge portion 12 may be provided on the entire linear ridge portion 10 or may be provided on a part of the linear ridge portion 10 at a symmetrical position with respect to the channel axis. This is preferable because the valve seat surface is provided symmetrically, and a stable sealing property can be obtained.

  Further, it is desirable that the ridge portion 12 is provided at a position of the linear ridge portion 10 facing the bottom surface portion 6 and / or the curved surface portion 8 on the upper surface of the partition wall 5. This is preferable because the projecting portion 12 makes line contact with the bottom surface portion 6 and the curved surface portion 8 where the seal of the valve seat surface is most required to improve the sealing performance. In particular, the curved surface portion 8 is formed in a concave shape instead of a flat surface for convenience of lathe processing as shown in FIG. 5, and the intersecting portion 22 between the rising surface 21 of the partition wall 5 and the curved surface portion 8 has a slightly protruding shape. However, even if the linear protrusion 10 of the diaphragm 9 is pressed against the valve seat surface so as to be strongly crushed, the protrusion 12 protruding from the top of the linear protrusion 10 is provided. Since the intersecting portion 22 and the liquid contact surface 23 around the linear protruding portion are kept at a distance of the protruding portion 12 crushed by the pressure contact, the intersecting portion 22 is linear in the curved surface portion 8 and the bottom surface portion 6. There is no contact with the liquid contact surface 23 around the ridge. Therefore, when performing continuous opening and closing, the crossing portion 22 does not come into contact with the liquid contact surface 23 around the linear ridge when fully closed, so that the diaphragm 9 is prevented from being deteriorated and damaged by contact every time as in the past. This is preferable.

  Here, the height h of the ridge 12 is the height to the top of the ridge 12 on the basis of the top of the linear ridge 10, as shown in FIG. The height of the ridge 10 is the height from the liquid contact surface of the diaphragm 9 to the apex of the linear ridge 10. The width a of the ridge 12 is a width between the boundary of the ridge 12 and the linear ridge 10, as shown in FIG. 4, and the width b of the linear ridge 10 is This is the width between the liquid contact surface of the diaphragm 9 and the boundary between the linear protrusions 10.

  The cross-sectional shapes of the linear protrusion 10 and the protrusion 12 are preferably substantially semicircular arcs. 4 has a height h of 0.05 W to 0.15 W with respect to a minimum width W (hereinafter referred to as a valve seat width) W of the upper surface of the partition wall 5. It is desirable that the range is 0.08 W to 0.14 W. By providing a certain height, the sealing performance is improved, and the protrusions 12 are provided so that the intersecting part 22 and the liquid contact surface 23 around the line protrusions do not come into contact with each other while maintaining a certain distance. Thus, in order to prevent the diaphragm 9 from being damaged even if it is continuously opened and closed, the height h of the protrusion 12 is 0.05 W or more with respect to the valve seat width W that is the distance between the intersecting portions 22. It is necessary to prevent the compressive strength of the ridge 12 from being lowered by making the ridge 12 too high, and to prevent the stress from concentrating on the ridge 12 and reducing the durability of the diaphragm 9. In order to do this, the height h of the ridge 12 needs to be 0.15 W or less with respect to the valve seat width W. Similarly, the width a of the ridge 12 is preferably in the range of 0.2 to 0.9 times the width b of the linear ridge 10, and is in the range of 0.28 to 0.84. Is more desirable. In order to obtain sufficient strength to seal the valve seat surface in pressure contact, the width a of the protrusion 12 needs to be 0.2 times or more than the width b of the linear protrusion 10, and the protrusion The width a of the ridge 12 is made narrower than the width b of the linear ridge 10 to improve the sealing performance by reducing the area of the contact surface between the valve seat surface and the ridge 12. Needs to be 0.9 times or less the width b of the linear protrusion 10. In addition, if it is in the said range, you may provide by changing gradually the ratio of the height and width | variety of the protrusion part 12 with respect to the linear protrusion part 10 formed with fixed height and width, for example. Alternatively, the ridges 12 having a certain height and width may be provided on the linear ridges 10 formed by gradually changing the ratio of the height and width.

  As shown in FIG. 8, the groove portion 36 in the second invention of the present application refers to the diaphragm 33 so that the intersecting portion 22 between the upper surface of the partition wall 5 and the rising surface 21 does not contact the liquid contact surface of the diaphragm 33 when the valve is closed. These are recessed portions provided in parallel on both sides of the linear protrusion 34. If the bottom surface 37 of the groove portion 36 does not come into contact with the intersecting portion 22 when the valve is closed, the depth, width and shape of the groove portion 36 are not particularly limited. However, the groove portion 36 is not provided deeper than necessary and is formed in a gently rounded shape. It is desirable to do. This is preferable in order to prevent stress from concentrating on a portion where the thickness of the diaphragm 33 is suddenly changed. Further, the intersecting portion 22 of the curved surface portion 8 has a slightly protruding shape for convenience of processing, and is most likely to come into contact with the liquid contact surface of the diaphragm 33, so that the groove portion 36 is provided at the deepest position relative to the curved surface portion 8. It is desirable that the other part is provided shallower than that. At this time, the position (back side) of the diaphragm 33 facing the groove portion 36 on the non-wetted surface may be provided thick, or the entire diaphragm 33 may be provided thick.

  The height (hereinafter referred to as the valve seat depth) H between the upper surface of the valve body 1 and the bottom surface portion 6 of the partition wall 5 of the first and second inventions of the present application (hereinafter collectively referred to as the present invention) is the valve body. In relation to the diameter D of one opening 2, it is desirable to set the range of H = 0.18D to 0.31D (see FIG. 2). If H is smaller than 0.18D, the pressure receiving area is reduced, so that the sealing performance of the valve can be improved and the valve can be provided in a compact manner. On the other hand, the flow rate is reduced and the CV value is lowered. This is because if the value is larger than 31, the flow rate increases and the CV value improves, while the deformation amount of the diaphragm 9 increases and a load is applied to the diaphragm 9. Therefore, in order to improve the sealing performance by reducing the diameter D of the opening 2 and to provide a valve in a compact manner, and at the same time, to secure a flow rate and maintain a sufficient CV value, H is 0.18D to 0.31D. It is desirable to set the range.

  As shown in FIG. 7, a thick portion 31 may be provided on the linear protrusion 29 of the diaphragm according to the first invention of the present application. The thick portion 31 is a portion of the linear protrusion 29 of the diaphragm 28 that appears to swell more than others, and is preferably a shape that bulges in the height direction and / or the width direction. Providing the thick portion 31 is preferable because the linear protrusion 29 is strongly pressed against the valve seat surface by the elastic force of the thick portion 31 and high sealing performance can be obtained. Further, when the diaphragm valve is closed, the thick portion 31 is provided so that the linear protrusion 29 can come into contact with the valve seat surface without a gap even when the diaphragm 28 is not strongly compressed from above. Therefore, the height of the linear protrusion 10 may be adjusted.

  Further, it is desirable that the thick portion 31 is provided at a position of the linear ridge portion 29 facing the bottom surface portion 6 and / or the curved surface portion 8 of the partition wall 5. This improves the sealing performance at the bottom surface portion 6 and the curved surface portion 8 where the seal of the valve seat surface is most required, and improves the strength of the linear protrusion 29 at the most stressed portion when the valve is closed. Even if it is continuously opened and closed, it is suitable because it can be used for a long period of time without damage. In particular, the curved surface portion 8 has a shape in which the intersecting portion 22 between the rising surface 21 of the partition wall 5 and the curved surface portion 8 is slightly projected for convenience of processing, but the linear protrusion 29 of the diaphragm 28 is formed on the valve seat surface. Even if pressed so as to be strongly crushed, the thick portion 31 is not crushed so much, so that a constant distance is maintained between the intersecting portion 22 and the liquid contact surface 23 around the linear protrusion. In the curved surface portion 8 and the bottom surface portion 6, the intersecting portion 22 does not come into contact with the liquid contact surface 23 around the linear protrusion. Therefore, when performing continuous opening / closing, the crossing portion 22 does not come into contact with the liquid contact surface 23 around the linear ridge portion every time when it is fully closed, so that the diaphragm 9 is deteriorated and damaged by contact as in the prior art. Can be prevented, which is preferable.

  In the present invention, the drive part of the diaphragm valve includes a manual type, an air driven type by pneumatic pressure (see FIG. 10), an electric driven type by a motor or the like (not shown), and any of them may be used without any particular limitation. In the case of the air drive type, the pneumatic drive unit 38 is engaged with the stem 39 in place of the handle 20 which is a manual operation of the diaphragm valve, and in the case of the electric drive type, the electric drive unit (motor or the like) is engaged with the stem 39 respectively. A type diaphragm valve is formed.

  In the present invention, the material of the diaphragm 9 is desirably a rubber-like elastic body, such as ethylene propylene rubber (hereinafter referred to as EPDM), isoprene rubber, chloroprene rubber, chlorosulfonated rubber, nitrile rubber, styrene butadiene rubber, chlorine. Suitable examples include fluorinated polyethylene and fluororubber. Diaphragm 9 is made of polypropylene (hereinafter referred to as PP), polyvinylidene fluoride (hereinafter referred to as PVDF), polytetrafluoroethylene (hereinafter referred to as PTFE), tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer (hereinafter referred to as PTFE). , PFA)) and the like, and is not particularly limited. Further, a strong reinforcing cloth may be inserted into the diaphragm 9, and the reinforcing cloth is preferably made of nylon (in the case of fluororubber, made of polyvinylidene fluoride). This is suitable for preventing deformation and breakage of the diaphragm 9 when fluid pressure is applied to the diaphragm when the valve is closed.

  In the present invention, the material of the valve body 1 and the bonnet 15 of the diaphragm valve is a resin such as polyvinyl chloride (hereinafter referred to as PVC), polystyrene, ABS resin, PP, PVDF, PTFE, PFA, polychlorotrifluoroethylene, Any of iron, copper, copper alloy, metal such as brass, aluminum, and stainless steel, or ceramic such as porcelain may be used. In particular, a resin diaphragm valve having excellent corrosion resistance is preferably used for a chemical solution piping line. Also, the material of the compressor 14 is not particularly limited, such as resin or metal, but is preferably made of resin such as PVDF. The material of the stem 18 and the sleeve 17 is not particularly limited as long as it has a desired strength, but metals such as iron, copper, copper alloy, brass, aluminum, and stainless steel are preferable.

Since the present invention is configured as described above, the following excellent effects can be obtained.
(1) Since the sealing surface is strongly pressed and sealed in a state where the contact area between the valve seat surface and the protruding portion is small, a sealing performance that is about 20% higher than that in the case where there is no conventional protruding portion can be obtained.
(2) Even if the linear protrusion of the diaphragm is pressed against the valve seat surface so as to be strongly crushed, the protrusion is formed so that the intersection of the upper surface and the rising surface of the partition wall is the linear shape of the diaphragm. Since it does not come into contact with the liquid contact surface around the ridge, when the continuous opening and closing is performed as in the conventional case, the crossing portion contacts the liquid contact surface every time when it is fully closed, so that the diaphragm deteriorates and breaks. Can be prevented.
(3) Even if the linear protrusion of the diaphragm is pressed against the valve seat surface so as to be strongly crushed, a groove is formed so that the intersection of the upper surface and the rising surface of the partition wall is the linear protrusion of the diaphragm Prevents the diaphragm from deteriorating and damaging because the intersection does not contact the liquid contact surface around the linear ridges every time it is fully closed, without contact with the liquid contact surface around it. be able to.
(4) If the diameter D of the opening is made small and the valve seat depth H is in the range of H = 0.18D to 0.31D, the pressure receiving area is small and the valve sealing performance is improved and the valve is made compact. The flow rate can be secured, a sufficient CV value can be maintained, and external leakage (external leakage) can be prevented.
(5) When a thick portion is provided on the linear protrusion, the linear protrusion is strongly pressed against the valve seat surface by the elastic force of the thick portion, and high sealing performance can be obtained. Furthermore, a higher sealing performance can be obtained by using the thick part and the protrusion part together.

  Hereinafter, although 1st embodiment of this invention 1st invention is described with reference to drawings, it cannot be overemphasized that this invention 1st invention is not limited to this embodiment. FIG. 1 is a longitudinal sectional view showing a diaphragm valve of the first embodiment. FIG. 2 is a longitudinal sectional view taken along line AA in FIG. FIG. 3 is a plan view of the liquid contact surface side of the diaphragm in FIG. FIG. 4 is an enlarged vertical sectional view of a main part of FIG. FIG. 5 is an enlarged vertical sectional view showing a main part of the curved surface portion of the first embodiment. FIG. 6 is a plan view on the wetted surface side showing a second embodiment of the diaphragm in FIG. FIG. 7 is a plan view on the liquid contact side showing a third embodiment of the diaphragm.

  In the figure, 1 is a valve body made of PVC having a diameter of 50 mm, an opening 2 is provided on the upper surface of the valve body 1, and is located in the middle of the inlet channel 3, the outlet channel 4 and both channels, A partition wall 5 that curves the flow path is provided. On the upper surface of the partition wall 5, a planar bottom surface portion 6 provided lower than the opening portion 2, a tapered inclined surface portion 7 rising from the bottom surface portion 6 toward the opening portion 2, and the bottom surface portion 6 and the inclined surface portion 7. The curved surface portion 8 is formed between the bottom surface portion 6, the slope portion 7, and the curved surface portion 8, thereby forming a valve seat surface. At this time, the valve seat width W is 10 mm. Further, the diameter D of the opening 2 of the valve body 1 and the valve seat depth H are provided such that H = 0.21D. In addition, although the slope part 7 of this invention is a taper shape, it may be circular arc shape, and when it is circular arc shape, it is preferable that it is circular arc shape with a big curvature. Further, the shape of the valve seat surface of the partition wall 5 is a flow formed from the valve seat surface and the later-described diaphragm 9 when the opening portion 2 is provided to reduce the pressure receiving area of the later-described diaphragm 9 and the diaphragm valve is fully opened. The above configuration is adopted so that the road opening area can be increased.

  Reference numeral 9 denotes an EPDM diaphragm. On the liquid contact surface side of the diaphragm 9, a linear protrusion 10 that is pressed against and separated from the valve seat surface on the upper surface of the partition wall 5 of the valve body 1, and the upper surface of the valve body 1. An annular ridge 11 is formed in pressure contact with the periphery of the opening 2. At the apex portion of the linear ridge portion 10, a ridge portion 12 having a constant height is provided over the entire linear ridge portion, and the height h (see FIG. 4) of the ridge portion 12 is the valve seat width. W is provided at 1.2 mm, which is 0.12 W with respect to 10 mm, and the width a of the ridge 12 is 0.6 times the width b of the linear ridge 10. The ridges 12 gradually become lower in the vicinity of both end portions of the linear ridges 10, and are almost the same height as the linear ridges 10 at the ends contacting the annular ridges 11. Is formed. An embedded fitting 13 is embedded on the non-wetted surface side of the diaphragm 9 with the upper portion protruding, and is engaged and fixed to a compressor 14 described later via the embedded fitting 13. The peripheral edge of the diaphragm 9 is sandwiched between the valve body 1 and a bonnet 15 to be described later, and the annular protrusion 11 is fixed by the lower surface of the bonnet 15 in a state of being crushed around the opening 2 on the upper surface of the valve body 1. .

  Reference numeral 14 denotes a PVDF compressor, and an upper portion is engaged and fixed to a lower end portion of a stem 18 described later. A PVC bonnet 15 is fixed to the upper portion of the valve body 1 with bolts and nuts (not shown), and a copper alloy sleeve 17 is supported in a through hole 16 at the upper center of the bonnet 15. Reference numeral 18 denotes a copper alloy stem that is screwed into a female screw portion 19 provided in the sleeve 17. Reference numeral 20 denotes a PP handle, which is fitted to the upper outer peripheral portion of the sleeve 17 and arranged at the upper end portion of the bonnet 15.

  Next, the operation of the diaphragm valve of the first embodiment will be described with reference to FIGS.

  When the handle 20 is rotated in the closing direction from the fully opened state of FIG. 1, the stem 18 and the compressor 14 provided at the lower end of the stem 18 are lowered according to the rotation of the handle 20, and the diaphragm 9 gradually bends downward. The linear protrusion 10 is brought into pressure contact with the valve seat surface on the upper surface of the partition wall 5 of the valve body 1, the inlet flow path 3 and the outlet flow path 4 are closed, and the diaphragm valve is fully closed. At this time, the valve seat surface and the protruding portion 12 are pressed against each other in the fully closed state, but the width a of the protruding portion 12 is set to be 0.6 times narrower than the width b of the linear protruding portion. Since the area of the contact surface between the seat surface and the ridge portion 12 is small, the seal surface is strongly pressed and sealed, so that a sealing performance that is about 20% higher than that in the case without the conventional ridge portion 12 can be obtained. Further, as shown in FIG. 5, the contact portion between the protruding portion 12 and the curved surface portion 8 of the valve seat surface is linear even if the linear protruding portion 10 is pressed and pressed against the valve seat surface. By providing the ridge portion 12 protruding from the apex portion of the ridge portion 10, contact between the rising surface 21 of the partition wall 5 and the intersecting portion 22 of the curved surface portion 8 and the periphery of the linear ridge portion of the diaphragm 9 is achieved. Since the distance between the liquid surface 23 and the ridge portion 12 in a state of being crushed by pressure contact is maintained, the intersecting portion 22 does not contact the liquid contact surface 23 around the linear ridge portion. At this time, the distance between the intersecting portion 22 and the liquid contact surface 23 around the linear protruding portion is determined by the height h of the protruding portion 12 and the valve seat width W between the intersecting portions 22, for example, having a constant height h. When the valve seat width W is narrower than the protrusion 12, the distance between the intersecting portion 22 and the liquid contact surface 23 around the linear protrusion is increased. When the valve seat width W is wide, the intersecting portion 22 and the linear protrusion are increased. The distance from the wetted surface 23 around the strip becomes narrow. Therefore, by providing the height h of the ridge portion 12 within a range of 0.05 W to 0.15 W, the intersecting portion 22 and the liquid contact surface 23 around the linear ridge portion are not reliably in contact with each other. can do. Therefore, when performing continuous opening and closing, the crossing portion 22 does not contact the liquid contact surface 23 around the linear ridge portion every time when it is fully closed, so that the diaphragm 9 is deteriorated and damaged by contact as in the conventional case. Can be prevented.

  Next, when the handle 20 is rotated in the opening direction, the compressor 18 provided at the stem 18 and the lower end portion of the stem 18 rises as the handle 20 rotates, and the linear protrusion 10 of the diaphragm 9 is separated from the valve seat surface, The diaphragm 9 gradually curves upward and rises to the open limit position, the inlet channel 3 and the outlet channel 4 are opened, and the diaphragm valve is fully opened (the state shown in FIG. 1).

  Further, in the present embodiment, the diameter D of the opening 2 is made small and the valve seat depth H is provided in the range of H = 0.18D to 0.31D, so that the pressure receiving area is small and the sealing performance of the valve is small. Is improved. Further, the valve can be provided in a compact manner, the flow rate can be secured, and a sufficient CV value can be maintained.

  Next, the diaphragm of the second embodiment will be described with reference to FIG.

  Reference numeral 24 denotes an EPDM diaphragm. On the liquid contact surface side of the diaphragm 24, a linear ridge portion 25 and an annular ridge portion 26 are formed. At the position of the linear ridge portion 25 facing the curved surface portion 8 of the partition wall 5, the ridge portion 27 gradually increases with respect to the linear ridge portion 25 symmetrically with respect to the flow path axis. The height h of the highest part of the protrusion 27 is 1.2 mm, and the width a of the protrusion 12 is a linear protrusion. The width b is 10 times 0.6.

  Next, the operation of the diaphragm of the second embodiment will be described with reference to FIG.

  When the valve is in the closed state, the curved surface portion 8 of the valve seat surface and the ridge portion 27 of the linear ridge portion 25 are strongly pressed and sealed in a state where the contact area is small. The surface part 8 can obtain a high sealing performance. Further, the contact portion between the protruding portion 27 and the curved surface portion 8 of the valve seat surface is opposed to the curved surface portion 8 even when the linear protruding portion 25 of the diaphragm 24 is pressed against the valve seat surface so as to be strongly crushed. By providing the ridge portion 27 protruding from the apex portion of the linear ridge portion 25, the intersecting portion 22 of the partition wall 5 and the liquid contact surface 23 around the linear ridge portion of the diaphragm 24 are brought into pressure contact. Since the distance of the ridge portion 27 in the collapsed state is maintained, the intersecting portion 22 does not contact the liquid contact surface 23 around the linear ridge portion in the curved surface portion 8. Therefore, when performing continuous opening and closing, the intersection 22 does not come into contact with the liquid contact surface 23 around the linear protrusion every time when it is fully closed, so that the diaphragm 9 is deteriorated and damaged by contact as in the conventional case. Can be prevented.

  Next, the diaphragm of the third embodiment will be described with reference to FIG.

  Reference numeral 28 denotes an EPDM diaphragm. On the liquid contact surface side of the diaphragm 28, a linear protrusion 29 and an annular protrusion 30 are formed. At the position of the linear protrusion 29 facing the curved surface 8 of the partition wall 5, a thick part 31 with the linear protrusion 29 thick is provided symmetrically with respect to the flow path axis. The thickness of the thickest part 31 is 3.8 times the height of the non-thick part, and the cross-sectional radius of the thick part 31 is the cross-section of the non-thick part. It is provided with 2.9 times the radius. A protrusion 32 having a constant height is provided on the entire apex of the linear protrusion 29, the height h of the protrusion 32 is 1.2 mm, and the linear protrusion The thickest portion 31 of the thickest portion 31 is provided so that the width a of the ridge portion 32 is 0.4 times the width b of the linear ridge portion 29. In the center, the width a of the protrusion 32 is set to be 0.7 times the width b of the linear protrusion 29. Note that the height of the protrusion 32 gradually decreases from the vicinity of both ends of the linear protrusion 29, and the height of the protrusion 32 is substantially the same as that of the linear protrusion 29 at the end in contact with the annular protrusion 30. It is formed as follows.

  Next, the operation of the diaphragm of the third embodiment will be described with reference to FIG.

  When the valve is in the closed state, it is strongly pressed against the curved surface portion 8 of the valve seat surface by the elastic force of the thick portion 31 of the linear ridge portion 29. In addition to being able to obtain high sealing performance, the valve seat Since the surface and the protrusion 32 are strongly pressed and sealed in a state where the contact area is small due to the line contact, higher sealing performance can be obtained. In addition, the contact portion between the protrusion 32 and the curved surface portion 8 of the valve seat surface is thick at a position facing the curved surface portion 8 even if the linear protrusion 29 is pressed against the valve seat surface. By providing the flesh portion 31 and further the ridge portion 32 protruding from the apex portion of the linear ridge portion 29, the intersection portion 22 of the partition wall 5 and the periphery of the linear ridge portion of the diaphragm 28 are provided. The liquid contact surface 23 maintains the distance between the thick portion 31 that is not crushed by pressure contact and the protruding portion 32 in a state of being crushed by pressure contact, so that the intersecting portion 22 is linear in the curved surface portion 8. There is no contact with the liquid contact surface 23 around the ridge. Therefore, when performing continuous opening and closing, the crossing portion 22 abuts on the liquid contact surface 23 around the linear ridge portion every time it is fully closed, so that the diaphragm 9 can be prevented from being deteriorated and broken. Further, since the thick-walled portion 31 has high strength against compression, the linear protrusion 29 is reinforced, and the linear protrusion 29, which is most likely to deteriorate due to continuous opening and closing, can be used for a long time without being damaged.

  Next, the second invention of the present application will be described with reference to the drawings. FIG. 8 is a plan view on the wetted surface side showing the first embodiment of the diaphragm in the second invention. FIG. 9 is an enlarged vertical sectional view showing a main part of the curved surface portion of the partition wall. In the second embodiment of the present invention, the configuration of the diaphragm valve is the same as that of the first embodiment of the first invention except for the diaphragm. ing.

  Reference numeral 33 denotes an EPDM diaphragm, and a linear protrusion 34 and an annular protrusion 34 are formed on the liquid contact surface side of the diaphragm 33. Grooves 36 are provided on the liquid contact surfaces located on both sides of the linear protrusion 34 in parallel with the linear protrusion 34. The groove portion 36 is provided so that the position facing the intersecting portion 22 of the curved surface portion 8 is deepest. When the valve is closed, the intersecting portion 22 of the partition wall 5 and the rising surface 21 does not contact the groove bottom surface 37. (The state of FIG. 9).

  Moreover, a thick part may be provided in the linear protrusion 34 similarly to the diaphragm of 1st invention shown in FIG. Since the configuration and operation are the same as described above, description and drawings are omitted.

  Next, the operation of this diaphragm will be described with reference to FIG.

  When the valve is in the closed state, the contact portion between the linear protrusion 34 and the curved surface portion 8 of the valve seat surface is located at the intersection with the intersection portion 22 of the curved surface portion 8 as shown in FIG. Since a certain distance is maintained between the groove 22 and the groove bottom surface 37, even if the linear protrusion 34 is pressed against the valve seat surface so as to be strongly crushed, the intersection 22 of the partition wall 5 is the groove bottom surface 37 of the diaphragm 33. And no contact with the liquid contact surface 23 around the linear protrusion. Therefore, when performing continuous opening and closing, the intersection portion 22 does not contact the groove bottom surface 37 and the liquid contact surface 23 around the linear protrusion every time when fully closed. It can be prevented from being damaged. Since other operations of the second invention of the present application are the same as the operations of the first embodiment of the first invention, the description thereof will be omitted.

It is a longitudinal cross-sectional view of the diaphragm valve which shows 1st embodiment of this invention 1st invention. It is a longitudinal cross-sectional view which follows the AA line of FIG. It is a top view by the side of the liquid-contacting surface of the diaphragm in FIG. It is a principal part expanded longitudinal cross-sectional view of FIG. It is a principal part expanded vertical sectional view which shows the curved surface part of 1st embodiment of this invention 1st invention. It is a top view by the side of the liquid-contact surface which shows 2nd embodiment of the diaphragm in FIG. It is a top view by the side of the liquid-contact surface which shows 3rd embodiment of the diaphragm in FIG. It is a top view of the liquid-contact surface side of the diaphragm which shows 1st embodiment in this-application 2nd invention. It is a principal part expanded vertical sectional view which shows the curved surface part of 1st embodiment of this invention 2nd invention. It is a fragmentary sectional view showing an air drive type diaphragm valve. It is a principal part expanded longitudinal sectional view which shows the conventional diaphragm valve. It is a perspective view of the diaphragm of the conventional diaphragm valve.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Valve body 2 ... Opening part 3 ... Inlet flow path 4 ... Outlet flow path 5 ... Partition wall 6 ... Bottom face part 7 ... Slope part 8 ... Curved surface part 9 ... Diaphragm 10 ... Linear protrusion 11 ... Annular protrusion 12 ... Projection 13 ... Embedded metal fitting 14 ... Compressor 15 ... Bonnet 16 ... Through hole 17 ... Sleeve 18 ... Stem 19 ... Female thread 20 ... Handle 21 ... Rising surface 22 ... Intersection 23 ... Around the linear projection Liquid contact surface 24: Diaphragm 25 ... Linear ridge 26 ... Annular ridge 27 ... ridge 28 ... Diaphragm 29 ... Linear ridge 30 ... Annular ridge 31 ... Thick part 32 ... ridge 33 ... Diaphragm 34 ... Linear ridge 35 ... Annular ridge 36 ... Groove 37 ... Groove bottom 38 ... Pneumatic drive 39 ... Stem

Claims (11)

  A valve body having an inlet channel, an outlet channel, and a partition wall that curves between the two channels, and a bonnet attached to the valve body, supported by the bonnet, and driven A compressor fixed to a lower end of a stem that engages with the portion, and a linear protrusion fixed to the compressor and sandwiched between the valve body and the bonnet and pressed against and separated from the upper surface of the partition wall And a diaphragm formed with an annular ridge that is press-contacted around the opening on the upper surface of the valve body, the linear ridge having a narrower protrusion than the linear ridge. A diaphragm valve characterized in that at least one step is provided.   The diaphragm valve according to claim 1, wherein the protruding portion is provided at a position symmetrical with respect to the entire linear protruding portion or a flow path axis.   The upper surface of the partition wall of the valve body has a flat bottom surface provided lower than the opening, a tapered or arcuate slope that rises from the bottom toward the opening, the bottom, and the bottom The ridge portion is provided at a position of the linear projecting portion facing the bottom surface portion and / or the curved surface portion of the partition wall. The diaphragm valve according to claim 1 or 2.   The cross-sectional shapes of the linear protrusion and the protrusion are substantially semicircular, and the height of the protrusion is in the range of 0.05 W to 0.15 W with respect to the minimum width W of the upper surface of the partition wall. The diaphragm according to any one of claims 1 to 3, wherein the width of the protrusion is 0.2 to 0.9 times the width of the linear protrusion. valve.   The diameter D of the opening of the valve body and the height H between the upper surface of the valve body and the bottom of the partition wall are provided in a range of H = 0.18D to 0.31D. The diaphragm valve according to any one of claims 1 to 4.   The diaphragm valve according to any one of claims 1 to 5, wherein a thick portion is provided on the linear protrusion.   The diaphragm valve according to any one of claims 1 to 6, wherein the driving unit is a manual type, an air driving type, or an electric driving type.   A valve body having an inlet channel, an outlet channel, and a partition wall that curves between the two channels, and a bonnet attached to the valve body, supported by the bonnet, and driven A compressor fixed to a lower end of a stem that engages with the portion, and a linear protrusion fixed to the compressor and sandwiched between the valve body and the bonnet and pressed against and separated from the upper surface of the partition wall And a diaphragm formed with an annular ridge that is press-contacted around the opening of the upper surface of the valve body, the linear protrusion on the liquid contact surface located on both sides of the linear ridge. A diaphragm valve characterized in that a groove portion is provided in parallel to the strip portion, and the intersection of the upper surface and the rising surface of the partition wall does not contact the bottom surface of the groove portion when the valve is closed.   The diameter D of the opening of the valve body and the height H between the upper surface of the valve body and the bottom of the partition wall are provided in a range of H = 0.18D to 0.31D. Item 9. The diaphragm valve according to Item 8. The diaphragm valve according to claim 8 or 9, wherein a thick portion is provided on the linear protrusion.   The diaphragm valve according to any one of claims 8 to 10, wherein the driving unit is a manual type, an air driving type, or an electric driving type.

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