JP7025925B2 - valve - Google Patents

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JP7025925B2
JP7025925B2 JP2017254131A JP2017254131A JP7025925B2 JP 7025925 B2 JP7025925 B2 JP 7025925B2 JP 2017254131 A JP2017254131 A JP 2017254131A JP 2017254131 A JP2017254131 A JP 2017254131A JP 7025925 B2 JP7025925 B2 JP 7025925B2
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valve
seat
valve body
seat portion
outer peripheral
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JP2019120285A (en
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泰平 飛田
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Tlv Co Ltd
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Tlv Co Ltd
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Description

本願は、蒸気や空気等の気体又は温水や水等の液体が流れる流体配管系統に設けられて流体の流れを制御する弁に関するものである。 The present application relates to a valve provided in a fluid piping system through which a gas such as steam or air or a liquid such as hot water or water flows to control the flow of fluid.

例えば特許文献１には、リリーフ弁が開示されている。このリリーフ弁は、流体が通過する弁口（圧力開放口）が形成された弁座と、弁座に離着座して弁口を開閉する弁体とを備えている。弁座には、凸環部が弁体側端に設けられ、弁体には、環状の凹溝が弁座側端に設けられている。弁体は、環状の凹溝の外表面全体が弁座の凸環部の外表面全体に着座することにより弁口を閉じる。 For example, Patent Document 1 discloses a relief valve. This relief valve includes a valve seat in which a valve opening (pressure release port) through which a fluid passes is formed, and a valve body that opens and closes the valve opening by taking off and sitting on the valve seat. The valve seat is provided with a convex ring portion at the valve body side end, and the valve body is provided with an annular concave groove at the valve seat side end. The valve body closes the valve opening by seating the entire outer surface of the annular concave groove on the entire outer surface of the convex ring portion of the valve seat.

実開平２－９３８１号公報Jikkenhei 2-9381 Gazette

ところで、前述のようなリリーフ弁においては、弁座と弁体との間隙が所定以下の途中開度のとき、弁口を通過する流体が弁座と弁体との間を高速で通過するため、弁座と弁体とにエロージョンが発生する可能性があった。 By the way, in the relief valve as described above, when the gap between the valve seat and the valve body is an intermediate opening of a predetermined value or less, the fluid passing through the valve opening passes between the valve seat and the valve body at high speed. , There was a possibility of erosion between the valve seat and the valve body.

本願に開示の技術は、かかる事情に鑑みてなされたものであり、その目的は、エロージョンの発生を抑制することができる弁を提供することにある。 The technique disclosed in the present application has been made in view of such circumstances, and an object thereof is to provide a valve capable of suppressing the occurrence of erosion.

本願の弁は、ケーシングと、弁座と、弁体とを備えている。前記ケーシングは、流体の流入口および流出口が設けられたものである。前記弁座は、前記流入口から流入した流体が通過して前記流出口へ流れる弁口が形成されたものである。前記弁体は、前記弁座に離着座して前記弁口を開閉するものである。前記弁座は、内周シート部および外周シート部を有する環状の凹溝又は凸環部が設けられたものである。前記弁体は、前記弁座の環状の凹溝の内周シート部および外周シート部に離着座する内周シート部および外周シート部を有する凸環部又は前記弁座の凸環部の内周シート部および外周シート部に離着座する内周シート部および外周シート部を有する環状の凹溝が設けられたものである。そして、前記弁体が前記弁座から離座し前記弁座と前記弁体との間隙が途中開度のとき、前記弁座の内周シート部と前記弁体の内周シート部とで形成される間隙から前記弁座の外周シート部と前記弁体の外周シート部とで形成される間隙に至る流路に流路面積を拡大する拡大部が設けられている。 The valve of the present application includes a casing, a valve seat, and a valve body. The casing is provided with a fluid inlet and outlet. The valve seat is formed with a valve port through which a fluid flowing from the inlet passes and flows to the outlet. The valve body opens and closes the valve opening by taking off and sitting on the valve seat. The valve seat is provided with an annular concave groove or convex ring portion having an inner peripheral seat portion and an outer peripheral seat portion. The valve body is a convex ring portion having an inner peripheral seat portion and an outer peripheral seat portion that are taken off and seated on the inner peripheral seat portion and the outer peripheral seat portion of the annular concave groove of the valve seat, or the inner circumference of the convex ring portion of the valve seat. An annular groove having an inner peripheral seat portion and an outer peripheral seat portion for taking off and sitting on the seat portion and the outer peripheral seat portion is provided. Then, when the valve body is separated from the valve seat and the gap between the valve seat and the valve body is opened in the middle, the inner peripheral seat portion of the valve seat and the inner peripheral seat portion of the valve body are formed. An enlarged portion for expanding the flow path area is provided in the flow path from the gap to the gap formed by the outer peripheral seat portion of the valve seat and the outer peripheral seat portion of the valve body.

本願の弁によれば、エロージョンの発生を抑制することができる。 According to the valve of the present application, the occurrence of erosion can be suppressed.

図１は、実施形態１に係る弁の概略構成を示す断面図である。FIG. 1 is a cross-sectional view showing a schematic configuration of a valve according to the first embodiment. 図２は、実施形態１に係る弁の弁座と弁体とについて弁体が弁座に着座した状態を拡大して示す断面図である。FIG. 2 is an enlarged cross-sectional view showing a state in which the valve body is seated on the valve seat with respect to the valve seat and the valve body according to the first embodiment. 図３は、実施形態１に係る弁の弁座と弁体とについて弁体が弁座から離座し弁座と弁体との間隙が所定以下の途中開度時の状態を拡大して示す断面図である。FIG. 3 shows an enlarged state of the valve seat and the valve body according to the first embodiment when the valve body is separated from the valve seat and the gap between the valve seat and the valve body is less than a predetermined opening. It is a sectional view. 図４は、実施形態２に係る弁の弁座と弁体とについて弁体が弁座から離座し弁座と弁体との間隙が所定以下の途中開度時の状態を拡大して示す断面図である。FIG. 4 shows an enlarged state of the valve seat and the valve body according to the second embodiment when the valve body is separated from the valve seat and the gap between the valve seat and the valve body is less than a predetermined opening. It is a sectional view. 図５は、実施形態１の変形例に係る弁の弁座と弁体とについて弁体が弁座から離座し弁座と弁体との間隙が所定以下の途中開度時の状態を拡大して示す断面図である。FIG. 5 shows an enlarged state of the valve seat and the valve body according to the modified example of the first embodiment when the valve body is separated from the valve seat and the gap between the valve seat and the valve body is less than a predetermined opening. It is a cross-sectional view shown by. 図６は、実施形態２の変形例に係る弁の弁座と弁体とについて弁体が弁座から離座し弁座と弁体との間隙が所定以下の途中開度時の状態を拡大して示す断面図である。FIG. 6 shows an enlarged state of the valve seat and the valve body according to the modified example of the second embodiment when the valve body is separated from the valve seat and the gap between the valve seat and the valve body is less than a predetermined opening. It is a cross-sectional view shown by.

以下、本願の実施形態について図面を参照しながら説明する。なお、以下の実施形態は、本質的に好ましい例示であって、本願に開示の技術、その適用物、あるいはその用途の範囲を制限することを意図するものではない。 Hereinafter, embodiments of the present application will be described with reference to the drawings. It should be noted that the following embodiments are essentially preferred examples and are not intended to limit the scope of the techniques disclosed in this application, their applications, or their uses.

（実施形態１）
図１は、実施形態１に係る弁の概略構成を示す断面図である。図２は、実施形態１に係る弁の弁座と弁体とについて弁体が弁座に着座した状態を拡大して示す断面図である。図３は、実施形態１に係る弁の弁座と弁体とについて弁体が弁座から離座し弁座と弁体との間隙が所定以下の途中開度時の状態を拡大して示す断面図である。本実施形態１の弁１は、流体として蒸気が流通するものである。図１に示すように、本実施形態１の弁１は、ケーシング１１と、弁座２１と、弁体３１とを備えている。 (Embodiment 1)
FIG. 1 is a cross-sectional view showing a schematic configuration of a valve according to the first embodiment. FIG. 2 is an enlarged cross-sectional view showing a state in which the valve body is seated on the valve seat with respect to the valve seat and the valve body according to the first embodiment. FIG. 3 shows an enlarged state of the valve seat and the valve body according to the first embodiment when the valve body is separated from the valve seat and the gap between the valve seat and the valve body is less than a predetermined opening. It is a sectional view. The valve 1 of the first embodiment is for circulating steam as a fluid. As shown in FIG. 1, the valve 1 of the first embodiment includes a casing 11, a valve seat 21, and a valve body 31.

ケーシング１１は、本体１２と、上蓋１３と、下蓋１４とを有している。なお、図１ではその縦方向が上下方向である。本体１２の上部開口には、仕切部材１５を挟んで上蓋１３が設けられている。上蓋１３および仕切部材１５は、上蓋１３に設けられているフランジ１６によって本体１２に締結されている。本体１２の下部開口には、下蓋１４が締結されている。本体１２には、蒸気の流入口１７および流出口１８が設けられている。流入口１７および流出口１８は互いに対向している。 The casing 11 has a main body 12, an upper lid 13, and a lower lid 14. In FIG. 1, the vertical direction is the vertical direction. An upper lid 13 is provided in the upper opening of the main body 12 with the partition member 15 interposed therebetween. The upper lid 13 and the partition member 15 are fastened to the main body 12 by a flange 16 provided on the upper lid 13. A lower lid 14 is fastened to the lower opening of the main body 12. The main body 12 is provided with a steam inlet 17 and an outlet 18. The inflow port 17 and the outflow port 18 face each other.

弁座２１は、本体１２の内部に設けられている。弁座２１は、略円筒状に形成され、円筒軸が上下方向に延びる状態で設けられている。そして、弁座２１は、円筒内部が弁口２２となっている。ケーシング１１の内部は、弁座２１の下方が流入空間１９となり、弁座２１の上部が流出空間２０となっている。流入空間１９は流入口１７と連通し、流出空間２０は流出口１８と連通し、流入空間１９と流出空間２０とは弁座２１の弁口２２によって連通している。弁座２１の弁口２２は、流入口１７と流出口１８とを連通させるものであり、流入口１７から流入した蒸気が通過して流出口１８へ流れるものである。 The valve seat 21 is provided inside the main body 12. The valve seat 21 is formed in a substantially cylindrical shape, and is provided in a state in which the cylindrical axis extends in the vertical direction. The valve seat 21 has a valve opening 22 inside the cylinder. Inside the casing 11, the lower part of the valve seat 21 is the inflow space 19, and the upper part of the valve seat 21 is the outflow space 20. The inflow space 19 communicates with the inflow port 17, the outflow space 20 communicates with the outflow port 18, and the inflow space 19 and the outflow space 20 communicate with each other by the valve port 22 of the valve seat 21. The valve port 22 of the valve seat 21 communicates the inflow port 17 and the outflow port 18, and the steam flowing in from the inflow port 17 passes through and flows to the outflow port 18.

弁体３１は、流出空間２０に配置されている。弁体３１には、上下方向に延びる弁軸３２が一体に設けられている。弁体３１は、弁軸３２が上下方向に変位することにより弁座２１の弁体側端に離着座し、弁口２２を開閉するものである。弁軸３２の上部は、仕切部材１５および上蓋１３を貫通して外部に突出している。弁軸３２と上蓋１３との間には、コイルバネ４１およびパッキング４２が押え部材４３によって装着されている。 The valve body 31 is arranged in the outflow space 20. The valve body 31 is integrally provided with a valve shaft 32 extending in the vertical direction. The valve body 31 takes off and seats at the valve body side end of the valve seat 21 due to the vertical displacement of the valve shaft 32, and opens and closes the valve opening 22. The upper portion of the valve shaft 32 penetrates the partition member 15 and the upper lid 13 and projects outward. A coil spring 41 and a packing 42 are mounted between the valve shaft 32 and the upper lid 13 by a pressing member 43.

弁座２１は、図２および図３に示すように、弁体側端に環状の凹溝２３が形成されている。環状の凹溝２３は、横断面が三角形に形成されている。環状の凹溝２３には、内周シート部２４及び外周シート部２５が設けられている。 As shown in FIGS. 2 and 3, the valve seat 21 has an annular concave groove 23 formed at the valve body side end. The annular groove 23 has a triangular cross section. The annular groove 23 is provided with an inner peripheral sheet portion 24 and an outer peripheral sheet portion 25.

弁体３１は、図２および図３に示すように、弁座側端に凸環部３２が形成されている。凸環部３２の先端は、横断面が半円形に形成されている。凸環部３２の先端側には、内周シート部３３及び外周シート部３４が設けられている。弁体３１は、凸環部３２の内周シート部３３及び外周シート部３４が弁座２１の環状の凹溝２３の内周シート部２４及び外周シート部２５に離着座することにより、弁口２２を開閉する。図２に示すように、弁体３１の内周シート部３３および外周シート部３４が弁座２１の内周シート部２４および外周シート部２５に着座して弁口２２を閉じたとき、弁座２１の内周シート部２４と外周シート部２５との間と、弁体３１の内周シート部３３と外周シート部３４との間とに拡大部４４が設けられている。 As shown in FIGS. 2 and 3, the valve body 31 has a convex ring portion 32 formed at the valve seat side end. The tip of the convex ring portion 32 has a semicircular cross section. An inner peripheral sheet portion 33 and an outer peripheral sheet portion 34 are provided on the tip end side of the convex ring portion 32. The valve opening of the valve body 31 is such that the inner peripheral seat portion 33 and the outer peripheral seat portion 34 of the convex ring portion 32 are detached and seated on the inner peripheral seat portion 24 and the outer peripheral seat portion 25 of the annular concave groove 23 of the valve seat 21. 22 is opened and closed. As shown in FIG. 2, when the inner peripheral seat portion 33 and the outer peripheral seat portion 34 of the valve body 31 are seated on the inner peripheral seat portion 24 and the outer peripheral seat portion 25 of the valve seat 21 and the valve opening 22 is closed, the valve seat An enlarged portion 44 is provided between the inner peripheral seat portion 24 of 21 and the outer peripheral seat portion 25, and between the inner peripheral seat portion 33 and the outer peripheral seat portion 34 of the valve body 31.

図３に示すように、弁体３１が弁座２１から離座し弁座２１と弁体３１との間隙が所定以下の途中開度のとき、弁座２１の内周シート部２４と外周シート部２５との間と、弁体３１の内周シート部３３と外周シート部３４との間とに形成される間隙Ｓ１における流路は、弁座２１の内周シート部２４と弁体３１の内周シート部３３とで形成される間隙Ｓ２から弁座２１の外周シート部２５と弁体３１の外周シート部３４とで形成される間隙Ｓ３に至る流路において流路面積を拡大する拡大部４４が設けられている。 As shown in FIG. 3, when the valve body 31 is separated from the valve seat 21 and the gap between the valve seat 21 and the valve body 31 is an intermediate opening of a predetermined value or less, the inner peripheral seat portion 24 and the outer peripheral seat of the valve seat 21 are formed. The flow path in the gap S1 formed between the portion 25 and between the inner peripheral seat portion 33 and the outer peripheral seat portion 34 of the valve body 31 is the inner peripheral seat portion 24 of the valve seat 21 and the valve body 31. An enlarged portion that expands the flow path area in the flow path from the gap S2 formed by the inner peripheral seat portion 33 to the gap S3 formed by the outer peripheral seat portion 25 of the valve seat 21 and the outer peripheral seat portion 34 of the valve body 31. 44 is provided.

弁体３１が弁座２１から離座し弁口２２が開けられると、流入口１７から流入した蒸気は、弁座２１の弁口２２を通過し、弁座２１の内周シート部２４と弁体３１の内周シート部３３との間から弁座２１の外周シート部２５と弁体３１の外周シート部３４との間を通過し、流出口１８から外部に流出する。 When the valve body 31 is separated from the valve seat 21 and the valve port 22 is opened, the steam flowing in from the inflow port 17 passes through the valve port 22 of the valve seat 21 and the inner peripheral seat portion 24 of the valve seat 21 and the valve. It passes between the inner peripheral seat portion 33 of the body 31 and between the outer peripheral seat portion 25 of the valve seat 21 and the outer peripheral seat portion 34 of the valve body 31, and flows out from the outlet 18.

本実施形態の弁１においては、弁体３１が弁座２１から離座し弁座２１と弁体３１との間隙が所定以下の途中開度のとき、弁座２１の内周シート部２４と外周シート部２５との間と、弁体３１の内周シート部３３と外周シート部３４との間とに形成される間隙Ｓ１における流路は、弁座２１の内周シート部２４と弁体３１の内周シート部３３とで形成される間隙Ｓ２から弁座２１の外周シート部２５と弁体３１の外周シート部３４とで形成される間隙Ｓ３に至る流路において流路面積を拡大する拡大部が設けられている。この場合、間隙Ｓ２における上流側圧力、間隙Ｓ１における中間圧力、間隙Ｓ３における下流側圧力の順に圧力が段階的に低下し、蒸気の流れは拡大部４４において減速する。このため、蒸気が弁座２１と弁体３１との間を高速で通過することを抑制することができる。これにより、エロージョンの発生を抑制することができる。 In the valve 1 of the present embodiment, when the valve body 31 is separated from the valve seat 21 and the gap between the valve seat 21 and the valve body 31 is an intermediate opening of a predetermined value or less, the inner peripheral seat portion 24 of the valve seat 21 and the valve body 31 The flow path in the gap S1 formed between the outer peripheral seat portion 25 and between the inner peripheral seat portion 33 and the outer peripheral seat portion 34 of the valve body 31 is the inner peripheral seat portion 24 of the valve seat 21 and the valve body. The flow path area is expanded in the flow path from the gap S2 formed by the inner peripheral seat portion 33 of 31 to the gap S3 formed by the outer peripheral seat portion 25 of the valve seat 21 and the outer peripheral seat portion 34 of the valve body 31. An enlarged part is provided. In this case, the pressure gradually decreases in the order of the upstream pressure in the gap S2, the intermediate pressure in the gap S1, and the downstream pressure in the gap S3, and the steam flow is decelerated in the enlarged portion 44. Therefore, it is possible to prevent steam from passing between the valve seat 21 and the valve body 31 at high speed. As a result, the occurrence of erosion can be suppressed.

（実施形態２）
図４は、実施形態２に係る弁の弁座と弁体とについて弁体が弁座から離座し弁座と弁体との間隙が所定以下の途中開度時の状態を拡大して示す断面図である。本実施形態２の弁の弁座１２１と弁体１３１とは、図４に示すように、弁座１２１に凸環部１２３を形成し、弁体１３１に環状の凹溝１３２を形成したものである。 (Embodiment 2)
FIG. 4 shows an enlarged state of the valve seat and the valve body according to the second embodiment when the valve body is separated from the valve seat and the gap between the valve seat and the valve body is less than a predetermined opening. It is a sectional view. As shown in FIG. 4, the valve seat 121 and the valve body 131 of the valve of the second embodiment have a convex ring portion 123 formed in the valve seat 121 and an annular concave groove 132 formed in the valve body 131. be.

弁座１２１は、弁体側端に凸環部１２３が形成されている。凸環部１２３は、横断面が半円形に形成されている。凸環部１２３には、内周シート部１２４及び外周シート部１２５が設けられている。 The valve seat 121 has a convex ring portion 123 formed at the valve body side end. The convex ring portion 123 has a semicircular cross section. The convex ring portion 123 is provided with an inner peripheral sheet portion 124 and an outer peripheral sheet portion 125.

弁体１３１は、弁座側端に環状の凹溝１３２が形成されている。環状の凹溝１３２は、横断面が三角形に形成されている。環状の凹溝１３２には、内周シート部１３３及び外周シート部１３４が設けられている。弁体１３１は、環状の凹溝１３２の内周シート部１３３及び外周シート部１３４が弁座１２１の凸環部１２３の内周シート部１２４及び外周シート部１２５に離着座することにより、弁口１２２を開閉する。 The valve body 131 is formed with an annular concave groove 132 at the valve seat side end. The annular groove 132 has a triangular cross section. The annular recessed groove 132 is provided with an inner peripheral sheet portion 133 and an outer peripheral sheet portion 134. In the valve body 131, the inner peripheral seat portion 133 and the outer peripheral seat portion 134 of the annular concave groove 132 are detached and seated on the inner peripheral seat portion 124 and the outer peripheral seat portion 125 of the convex ring portion 123 of the valve seat 121, whereby the valve opening Open and close 122.

弁体１３１が弁座１２１から離座し弁座１２１と弁体１３１との間隙が所定以下の途中開度のとき、弁座１２１の内周シート部１２４と外周シート部１２５との間と、弁体１３１の内周シート部１３３と外周シート部１３４との間とに形成される間隙Ｓ４における流路は、弁座１２１の内周シート部１２４と弁体１３１の内周シート部１３３とで形成される間隙Ｓ５から弁座１２１の外周シート部１２５と弁体１３１の外周シート部１３４とで形成される間隙Ｓ６に至る流路において流路面積を拡大する拡大部１４４が設けられている。 When the valve body 131 is separated from the valve seat 121 and the gap between the valve seat 121 and the valve body 131 is an intermediate opening of a predetermined value or less, between the inner peripheral seat portion 124 and the outer peripheral seat portion 125 of the valve seat 121, The flow path in the gap S4 formed between the inner peripheral seat portion 133 of the valve body 131 and the outer peripheral seat portion 134 is formed by the inner peripheral seat portion 124 of the valve seat 121 and the inner peripheral seat portion 133 of the valve body 131. An enlarged portion 144 for expanding the flow path area is provided in the flow path from the formed gap S5 to the gap S6 formed by the outer peripheral sheet portion 125 of the valve seat 121 and the outer peripheral sheet portion 134 of the valve body 131.

弁体１３１が弁座１２１から離座し弁口１２２が開けられると、蒸気は、弁座１２１の弁口１２２を通過し、弁座１２１の内周シート部１２４と弁体１３１の内周シート部１３３との間から弁座１２１の外周シート部１２５と弁体１３１の外周シート部１３４との間を通過する。 When the valve body 131 is separated from the valve seat 121 and the valve opening 122 is opened, steam passes through the valve opening 122 of the valve seat 121, and the inner peripheral seat portion 124 of the valve seat 121 and the inner peripheral sheet of the valve body 131 are opened. It passes between the outer peripheral seat portion 125 of the valve seat 121 and the outer peripheral seat portion 134 of the valve body 131 from between the portions 133.

本実施形態２の弁においては、弁体１３１が弁座１２１から離座し弁座１２１と弁体１３１との間隙が所定以下の途中開度のとき、弁座１２１の内周シート部１２４と外周シート部１２５との間と、弁体１３１の内周シート部１３３と外周シート部１３４との間とに形成される間隙Ｓ４における流路は、弁座１２１の内周シート部１２４と弁体１３１の内周シート部１３３とで形成される間隙Ｓ５から弁座１２１の外周シート部１２５と弁体１３１の外周シート部１３４とで形成される間隙Ｓ６に至る流路において流路面積を拡大する拡大部１４４が設けられている。この場合、間隙Ｓ５における上流側圧力、間隙Ｓ４における中間圧力、間隙Ｓ６における下流側圧力の順に圧力が段階的に低下し、蒸気の流れは拡大部１４４において減速する。このため、蒸気が弁座１２１と弁体１３１との間を高速で通過することを抑制することができる。これにより、エロージョンの発生を抑制することができる。 In the valve of the second embodiment, when the valve body 131 is separated from the valve seat 121 and the gap between the valve seat 121 and the valve body 131 is an intermediate opening of a predetermined value or less, the inner peripheral seat portion 124 of the valve seat 121 and the valve body 131 The flow path in the gap S4 formed between the outer peripheral seat portion 125 and between the inner peripheral seat portion 133 and the outer peripheral seat portion 134 of the valve body 131 is the inner peripheral seat portion 124 of the valve seat 121 and the valve body. The flow path area is expanded in the flow path from the gap S5 formed by the inner peripheral seat portion 133 of the 131 to the gap S6 formed by the outer peripheral seat portion 125 of the valve seat 121 and the outer peripheral seat portion 134 of the valve body 131. An enlarged portion 144 is provided. In this case, the pressure gradually decreases in the order of the upstream pressure in the gap S5, the intermediate pressure in the gap S4, and the downstream pressure in the gap S6, and the steam flow is decelerated in the enlarged portion 144. Therefore, it is possible to prevent steam from passing between the valve seat 121 and the valve body 131 at high speed. As a result, the occurrence of erosion can be suppressed.

以上のように、上記実施形態の弁は、弁体３１，１３１が弁座２１，１２１から離座し弁座２１，１２１と弁体３１，１３１との間隙が所定以下の途中開度のとき、弁座２１，１２１の内周シート部２４，１２４と外周シート部２５，１２５との間と、弁体３１，１３１の内周シート部３３，１３３と外周シート部３４，１３４との間とに形成される間隙Ｓ１，Ｓ４における流路は、弁座２１，１２１の内周シート部２４，１２４と弁体３１，１３１の内周シート部３３，１３３とで形成される間隙Ｓ２，Ｓ５における流路から弁座２１，１２１の外周シート部２５，１２５と弁体３１，１３１の外周シート部３４，１３４とで形成される間隙Ｓ３，Ｓ６に至る流路において流路面積を拡大する拡大部４４，１４４が設けられている。 As described above, in the valve of the above embodiment, when the valve bodies 31, 131 are separated from the valve seats 21, 121 and the gap between the valve seats 21, 121 and the valve bodies 31, 131 is an intermediate opening of a predetermined value or less. , Between the inner peripheral seats 24, 124 of the valve seats 21, 121 and the outer peripheral seats 25, 125, and between the inner peripheral seats 33, 133 and the outer peripheral seats 34, 134 of the valve bodies 31, 131. The flow path in the gaps S1 and S4 formed in is in the gaps S2 and S5 formed by the inner peripheral seat portions 24 and 124 of the valve seats 21 and 121 and the inner peripheral seat portions 33 and 133 of the valve bodies 31 and 131. An enlarged portion that expands the flow path area in the flow path from the flow path to the gaps S3 and S6 formed by the outer peripheral sheet portions 25 and 125 of the valve seats 21 and 121 and the outer peripheral sheet portions 34 and 134 of the valve bodies 31 and 131. 44, 144 are provided.

上記の構成によれば、間隙Ｓ２，Ｓ５における上流側圧力、間隙Ｓ１，Ｓ４における中間圧力、間隙Ｓ３，Ｓ６における下流側圧力の順に圧力が段階的に低下し、蒸気の流れは拡大部４４，１４４において減速する。このため、蒸気が弁座２１，１２１と弁体３１，１３１との間を高速で通過することを抑制することができる。これにより、エロージョンの発生を抑制することができる。 According to the above configuration, the pressure gradually decreases in the order of the upstream pressure in the gaps S2 and S5, the intermediate pressure in the gaps S1 and S4, and the downstream pressure in the gaps S3 and S6, and the steam flow is expanded in the expanding portion 44, Decelerate at 144. Therefore, it is possible to prevent steam from passing between the valve seats 21, 121 and the valve bodies 31, 131 at high speed. As a result, the occurrence of erosion can be suppressed.

（その他の実施形態）
上記実施形態１において弁座２１の環状の凹溝２３は、横断面が三角形に形成されているが、これに限られるものではない。例えば、図５に示すように、弁座２２１の環状の凹溝２２３は、横断面が矩形に形成されてもよい。矩形の環状の凹溝２２３には、内周シート部２２４及び外周シート部２２５が設けられている。弁体３１は、凸環部３２の内周シート部３３及び外周シート部３４が弁座２２１の環状の凹溝２２３の内周シート部２２４及び外周シート部２２５に離着座することにより、弁口２２２を開閉する。弁体３１が弁座２２１から離座し弁座２２１と弁体３１との間隙が所定以下の途中開度のとき、弁座２２１の内周シート部２２４と外周シート部２２５との間と、弁体３１の内周シート部３３と外周シート部３４との間とに形成される間隙Ｓ７における流路は、弁座２２１の内周シート部２２４と弁体３１の内周シート部３３とで形成される間隙Ｓ８から弁座２２１の外周シート部２２５と弁体３１の外周シート部３４とで形成される間隙Ｓ９に至る流路において流路面積を拡大する拡大部２４４が設けられている。 (Other embodiments)
In the first embodiment, the annular groove 23 of the valve seat 21 has a triangular cross section, but is not limited thereto. For example, as shown in FIG. 5, the annular recessed groove 223 of the valve seat 221 may have a rectangular cross section. The rectangular annular groove 223 is provided with an inner peripheral sheet portion 224 and an outer peripheral sheet portion 225. In the valve body 31, the inner peripheral seat portion 33 and the outer peripheral seat portion 34 of the convex ring portion 32 are detached and seated on the inner peripheral seat portion 224 and the outer peripheral seat portion 225 of the annular concave groove 223 of the valve seat 221. Open and close 222. When the valve body 31 is separated from the valve seat 221 and the gap between the valve seat 221 and the valve body 31 is an intermediate opening of a predetermined value or less, between the inner peripheral seat portion 224 and the outer peripheral seat portion 225 of the valve seat 221. The flow path in the gap S7 formed between the inner peripheral seat portion 33 of the valve body 31 and the outer peripheral seat portion 34 is formed by the inner peripheral seat portion 224 of the valve seat 221 and the inner peripheral seat portion 33 of the valve body 31. An enlarged portion 244 for expanding the flow path area is provided in the flow path from the formed gap S8 to the gap S9 formed by the outer peripheral seat portion 225 of the valve seat 221 and the outer peripheral seat portion 34 of the valve body 31.

また、上記実施形態２において弁体１３１の環状の凹溝１３２は、横断面が三角形に形成されているが、これに限られるものではない。例えば、図６に示すように、弁体３３１の環状の凹溝３３２は、横断面が矩形に形成されてもよい。矩形の環状の凹溝３３２には、内周シート部３３３及び外周シート部３３４が設けられている。弁体３３１は、環状の凹溝３３２の内周シート部３３３及び外周シート部３３４が弁座１２１の凸環部１２３の内周シート部１２４及び外周シート部１２５に離着座することにより、弁口１２２を開閉する。弁体３３１が弁座１２１から離座し弁座１２１と弁体３３１との間隙が所定以下の途中開度のとき、弁座１２１の内周シート部１２４と外周シート部１２５との間と、弁体３３１の内周シート部３３３と外周シート部３３４との間とに形成される間隙Ｓ１０における流路は、弁座１２１の内周シート部１２４と弁体３３１の内周シート部３３３とで形成される間隙Ｓ１１から弁座１２１の外周シート部１２５と弁体３３１の外周シート部３３４とで形成される間隙Ｓ１２に至る流路において流路面積を拡大する拡大部３４４が設けられている。 Further, in the second embodiment, the annular concave groove 132 of the valve body 131 has a triangular cross section, but is not limited to this. For example, as shown in FIG. 6, the annular recessed groove 332 of the valve body 331 may have a rectangular cross section. The rectangular annular groove 332 is provided with an inner peripheral sheet portion 333 and an outer peripheral sheet portion 334. The valve opening of the valve body 331 is such that the inner peripheral seat portion 333 and the outer peripheral seat portion 334 of the annular concave groove 332 are detached and seated on the inner peripheral seat portion 124 and the outer peripheral seat portion 125 of the convex ring portion 123 of the valve seat 121. Open and close 122. When the valve body 331 is separated from the valve seat 121 and the gap between the valve seat 121 and the valve body 331 is an intermediate opening of a predetermined value or less, between the inner peripheral seat portion 124 and the outer peripheral seat portion 125 of the valve seat 121, The flow path in the gap S10 formed between the inner peripheral seat portion 333 of the valve body 331 and the outer peripheral seat portion 334 is formed by the inner peripheral seat portion 124 of the valve seat 121 and the inner peripheral seat portion 333 of the valve body 331. An enlarged portion 344 for expanding the flow path area is provided in the flow path from the formed gap S11 to the gap S12 formed by the outer peripheral seat portion 125 of the valve seat 121 and the outer peripheral seat portion 334 of the valve body 331.

また、上記実施形態の弁は、蒸気以外の流体、例えば、空気、温水、水であっても同様に適用することができる。 Further, the valve of the above embodiment can be similarly applied to a fluid other than steam, for example, air, hot water, or water.

本願に開示の技術は、流体の流れを制御する弁について有用である。 The techniques disclosed herein are useful for valves that control fluid flow.

１ 弁
１１ ケーシング
１７ 流入口
１８ 流出口
２１，１２１，２２１ 弁座
２２，１２２，２２２ 弁口
２３，１２３，２２３ 凹溝
２４，１２４，２２４ 内周シート部
２５，１２５，２２５ 外周シート部
３１，１３１，３３１ 弁体
３２，１３２，３３２ 凸環部
３３，１３３，３３３ 内周シート部
３４，１３４，３３４ 外周シート部
４４，１４４，２４４，３４４ 拡大部
Ｓ１，Ｓ４，Ｓ７，Ｓ１０ 間隙
Ｓ２，Ｓ５，Ｓ８，Ｓ１１ 間隙
Ｓ３，Ｓ６，Ｓ９，Ｓ１２ 間隙

1 Valve 11 Casing 17 Inflow port 18 Outlet 21, 121,221 Valve seat 22, 122, 222 Valve port 23, 123, 223 Recessed groove 24, 124, 224 Inner peripheral seat portion 25, 125, 225 Outer peripheral seat portion 31, 131,331 Valve body 32,132,332 Convex ring portion 33,133,333 Inner peripheral seat portion 34,134,334 Outer peripheral seat portion 44,144,244,344 Enlarged portion S1, S4, S7, S10 Gap S2, S5 , S8, S11 gap S3, S6, S9, S12 gap

Claims (1)

流体の流入口および流出口が設けられたケーシングと、
前記流入口から流入した流体が通過して前記流出口へ流れる弁口が形成された弁座と、
前記弁座に離着座して前記弁口を開閉する弁体とを備え、
前記弁座は、内周シート部および外周シート部を有する環状の凹溝又は凸環部が設けられるとともに、前記凹溝の横断面は三角形に形成され、前記凸環部の横断面は半円形に形成されており、
前記弁体は、前記弁座の環状の凹溝の内周シート部および外周シート部に離着座する内周シート部および外周シート部を有する凸環部又は前記弁座の凸環部の内周シート部および外周シート部に離着座する内周シート部および外周シート部を有する環状の凹溝が設けられるとともに、前記凹溝の横断面は三角形に形成され、前記凸環部の横断面は半円形に形成されており、
前記凹溝の横断面の三角形と前記凸環部の横断面の半円形とによって構成される拡大部であって、前記弁体が前記弁座から離座し前記弁座と前記弁体との間隙が途中開度のとき、前記弁座の内周シート部と前記弁体の内周シート部とで形成される間隙から前記弁座の外周シート部と前記弁体の外周シート部とで形成される間隙に至る流路に、流路面積を拡大することによって流体を減速させ、上流側から下流側の順に段階的に圧力を低下させる拡大部が設けられていることを特徴とする弁。 Casing with fluid inlet and outlet,
A valve seat formed with a valve port through which the fluid flowing from the inlet passes and flows to the outlet.
It is provided with a valve body that opens and closes the valve opening by taking off and sitting on the valve seat.
The valve seat is provided with an annular concave groove or convex ring portion having an inner peripheral seat portion and an outer peripheral seat portion, and the cross section of the concave groove is formed in a triangular shape, and the cross section of the convex ring portion is half. It is formed in a circle and
The valve body is a convex ring portion having an inner peripheral seat portion and an outer peripheral seat portion that are taken off and seated on the inner peripheral seat portion and the outer peripheral seat portion of the annular concave groove of the valve seat, or the inner circumference of the convex ring portion of the valve seat. An annular concave groove having an inner peripheral seat portion and an outer peripheral seat portion for taking off and seating is provided on the seat portion and the outer peripheral seat portion, and the cross section of the concave groove is formed into a triangle, and the cross section of the convex ring portion is It is formed in a semi-circular shape and
It is an enlarged portion composed of a triangle having a cross section of the concave groove and a semicircle having a cross section of the convex ring portion, and the valve body is separated from the valve seat to form a valve seat and the valve body. When the gap is open in the middle, it is formed by the outer peripheral seat portion of the valve seat and the outer peripheral seat portion of the valve body from the gap formed by the inner peripheral seat portion of the valve seat and the inner peripheral seat portion of the valve body. A valve characterized in that the flow path leading to the gap is provided with an expansion portion that slows down the fluid by expanding the flow path area and gradually reduces the pressure from the upstream side to the downstream side. ..
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130020521A1 (en) 2011-04-14 2013-01-24 S.P.M. Flow Control, Inc. Preconfigured seal for valve assemblies
CN106090268A (en) 2016-08-23 2016-11-09 成都欧浦特控制阀门有限公司 A kind of control valve automatic control system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT337510B (en) * 1973-04-09 1977-07-11 Klinger Ag SEALING SYSTEM FOR BUTTONS
JPS6019867U (en) * 1983-07-19 1985-02-12 豊田工機株式会社 Air control valve

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130020521A1 (en) 2011-04-14 2013-01-24 S.P.M. Flow Control, Inc. Preconfigured seal for valve assemblies
CN106090268A (en) 2016-08-23 2016-11-09 成都欧浦特控制阀门有限公司 A kind of control valve automatic control system

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