DE102016122661A1 - Pressure reducing valve for liquid and gaseous media - Google Patents

Abstract

The present invention relates to a pressure reducing valve (10) for liquid and gaseous media, in particular for regulating the pressure in piping systems, preferably in buildings, with a housing (12), wherein the housing (12) has an upper housing part (14), a middle housing part (16 ) and a housing cover (18), wherein the housing middle part (16) has a piston bore (20), wherein the pressure reducing valve (10) further comprises a membrane (32) for dividing the housing (12) into a fluid-free and a fluid-flow area (48 , 50), said pressure reducing valve (10) further comprising a piston (24) movably guided in said piston bore (20), said piston (24) being connected at one of its ends to said diaphragm (32) and at its other end a seat seal (34), wherein the seat seal (34) substantially by a convexly outwardly or inwardly outwardly formed circumferential sealing lip (36) is formed and / or that the K is integral with the membrane at one of its ends.

Description

The present invention relates to a pressure reducing valve for liquid and gaseous media, in particular for regulating the pressure in piping systems, e.g. in buildings.

Pressure reducing valves are already known from the prior art. These are used for example in piping systems for water treatment plants or for ultrapure water systems.

The DE 44 34 634 B2 discloses a pressure reducing valve in which the adjustment of the desired outlet pressure is easy to handle. The medium flowing into the housing has a high or too high pressure for further use. By setting the desired outlet pressure can be adjusted by the spring is biased accordingly. This in turn gives the corresponding force on the piston, which regulates the outlet pressure. If the spring is strongly compressed, it generates a high counterforce on the piston, whereby the desired outlet pressure is high. The piston or the sealing seat, which is located between the valve element and the annular projection of the housing, closes only when the building pressure in the valve or in the piston chamber is so large that it exceeds the allowable outlet pressure, whereby the piston against the spring force is pressed and the valve element closes the valve seat. The piston and the valve element with rod consist of several items, also sealing elements are arranged on it, which ensure the tightness, which are also formed as separate parts. Such a pressure reducing valve has disadvantages in use in high purity media, since this is the many items increased the possibility of contamination. In addition, sealing elements made of elastomers, as they are commonly used, are inadmissible for use in high purity media, as they cause an undesirable abrasion that could contaminate the purest medium.

From the EP 2 843 495 A1 Further, a pressure reducing valve is known in which the piston of the pressure reducing valve is integrally formed and the sealing element is integrally disposed on the piston or integrally on the inner housing.

Other pressure reducing valves are for example from the JP 2002-157021 A , of the DE 40 24 487 A1 , of the GB 2071277 A , of the EP 2 211 247 A2 , of the US 3,902,522 , of the FR 2632045 A1 as well as the DE 44 34 634 A1 known.

The object of the present invention is to develop a pressure reducing valve of the type mentioned in an advantageous manner, in particular to the effect that a pressure reducing valve can be simple and at the same time the sealing elements used can not cause contamination of the medium passed through the pressure reducing valve.

This object is achieved by a pressure reducing valve with the features of claim 1. Thereafter, it is provided that a pressure reducing valve for liquid and gaseous media, in particular for regulating the pressure in piping systems, preferably in buildings, is provided, wherein the pressure reducing valve has a housing, wherein the housing has a housing upper part, a middle part of the housing and a housing cover, wherein the housing middle part has a piston bore, wherein the pressure reducing valve further comprises a membrane for dividing the housing into a fluid-free and a fluid-flow area, the pressure reducing valve also having a piston movably guided in the piston bore wherein the piston is connected at one of its ends to the membrane and at its other end has a seat seal, wherein the seat seal substantially by a outwardly or inwardly convexly formed umla ufende sealing lip is formed and / or that the piston is integrally connected at one of its ends with the membrane.

The invention is based on the basic idea that the seat seal can optimally invest in a contact surface in the housing of the pressure reducing valve and is pressed by the training as circumferential sealing lip and correspondingly by flow of fluid sealing against this contact surface.

By training as circumferential sealing lip is further achieved that in addition manufacturing tolerances can be compensated. This results in an inner cavity in the seat seal, which allows an inflow of fluid for pressure-assisted contact of the sealing lip, so that in this way also further manufacturing tolerances can be compensated, since a corresponding pressure is exerted on the sealing surfaces. A leak in the seat seal is thereby prevented. The seat seal can thus also be easily integrated into the piston. By this configuration, the sealing lip can be integrally formed on the piston. As a result, additional components are avoided. The seat seal and the piston or at least a part of the piston can be formed as a common, one-piece injection molded part, in particular as a plastic injection molded part.

Alternatively or additionally, it may be provided that the piston is integrally connected at one of its ends to the membrane. By the Integral Anformung results in the advantage that a simple production is possible. In addition, it is achieved that there are fewer gaps in the area of the piston, which can run the risk of dirt settling there. It is conceivable to vulcanize or stick on an integral molding or to achieve other suitable production methods, eg 2-component injection molding.

The seat seal may have a hemispherical and / or egg cup-shaped or at least partially hemispherical and / or partially egg-cup-like shape. This design facilitates the contact with the corresponding sealing surface for the seat seal. The otherwise prevailing very narrow tolerance fields can be widened thereby, so that the manufacturing costs can be reduced as a result.

The sealing lip may be formed at least partially flexible. As a result, the system of the sealing lip is facilitated to the corresponding sealing surface in the housing. The sealing function can thereby be improved.

The material of the sealing lip may be, for example, polytetrafluoroethylene (PTFE) and / or polyvinylidene fluoride (PVDF).

In addition, it can be provided that the sealing lip in the closed state of the pressure reducing valve is sealingly applied to an edge of the piston bore. The sealing surface is thus formed by the edge of the piston bore. As a result, a perfect or almost perfect adjustment of the seat seal in the valve is achieved, whereby a control can be achieved.

Furthermore, it can be provided that the membrane is integrally formed on the piston. As a result, the number of parts in the pressure reducing valve is reduced. It is conceivable to produce membrane and piston or upper piston part as a single injection molded part, in particular plastic injection molded part.

The membrane may have an outer diameter which substantially corresponds to the outer diameter of the upper housing part and the middle part of the housing. As a result, a support and attachment of the membrane between the upper housing part and the middle part is facilitated. The seal between the fluid-free and the fluid-flow area is thereby improved.

The membrane may be clamped between the upper housing part and the middle part of the housing. As a result, a simple attachment of the membrane is achieved in the housing of the pressure reducing valve.

In addition, it can be provided that the membrane has a recess which is located in the mounted state movable in a valve chamber. This makes it possible that the membrane is movable and can follow movements of the piston accordingly, without being stretched excessively.

In addition, it can be provided that the membrane cooperates with a sealing element, wherein in the assembled state, the sealing element between the membrane and the upper housing part or middle part is arranged. The sealing element may be, for example, an O-ring or a vulcanized sealing ring. As a result, a seal is supported or produced between the fluid-free and the fluid-flow area.

Moreover, it can be provided that the piston is designed in several parts. Due to the multi-part design of the piston, the production of the piston is simplified. In particular, it is thereby possible to enable the integral molding of the seat seal, but also the one-piece molding, for example, the membrane. The piston may have a piston upper part and a piston lower part. The upper piston part and the lower piston part can be screwed together, clipped together or attached to each other. It is particularly conceivable that the lower piston part is screwed onto the piston upper part or vice versa.

Between piston upper part and piston lower part, a piston seal may be provided, which is clamped between piston upper part and piston lower part.

Further details and advantages of the invention will now be explained in more detail with reference to an embodiment executed in the drawing. The single FIGURE shows a schematic sectional view through an embodiment of a pressure reducing valve according to the invention.

In the only figure is a pressure reducing valve 10 shown.

The pressure reducing valve 10 is a pressure reducing valve 10 for liquid and gaseous media, in particular for regulating the pressure in piping systems, preferably in buildings.

As an area of application, for example, ultrapure water applications or the use as ultrapure water pressure reducing valves into consideration.

The pressure reducing valve 10 has a housing 12 on.

The housing 12 has an upper housing part 14 , a middle part of the housing 16 and a housing cover 18 on.

In this case, the middle part of the housing 16 a piston bore 20 on, focusing on the top of the housing 14 facing side in a part of a valve chamber 22 expands.

The pressure reducing valve 10 further has one in the piston bore 20 guided piston 24 on.

The piston 24 is designed in several parts.

The multi-part piston 24 has a piston upper part 26 and a piston bottom 28 on.

The piston lower part 28 is on the piston upper part 26 by means of a thread 30 screwed.

At the piston upper part 26 is in one piece a membrane 32 formed. This is the membrane 32 integral to one end of the piston 24 formed.

At the piston bottom 28 is a one-piece seat seal 34 formed.

Next is between piston upper part 26 and piston base 28 a piston seal 27 with one against the inner surface of the piston bore 20 employed sealing lip 27a intended.

The seat seal 34 is essentially by a convex outwardly convex sealing lip 36 educated.

The sealing lip 36 is formed a total of hemispherical or eierbecherartig.

The sealing lip 36 is further flexible and made in the embodiment shown here made of polytetrafluoroethylene (PTFE). Alternatively, it is also possible to use polyvinylidene fluoride (PVDF) or other fluoropolymers.

The pressure reducing valve 10 is shown here in the open assembled state. In the closed assembled state is the seat seal 34 sealing to the lower edge (as shown in the figure) of the piston bore 20 created.

The pressure reducing valve 10 has a first connection 38 and a second connection 40 on. In the connections 38 and 40 is in each case a piece of pipe 42 respectively. 44 connected, screwed in here by a correspondingly provided thread.

The connection 38 is with the piston bore 20 connected and flows into it. piston bore 20 and connection 38 are arranged perpendicular to each other.

In the housing cover 18 facing end portion of the piston bore 20 this opens into another valve chamber 46 the area through which the fluid flows 48 the pressure reducing valve 10 belongs.

In contrast, further is a fluid-free area 50 provided, which is located substantially in the area of the upper housing part 14 located and through the membrane 32 from the fluid-flow area 48 is separated.

Between housing middle part 16 and housing cover 18 is a seal 52 provided here in the form of a sealing ring in a circumferential groove in the housing cover 18 is inserted. In principle, it can be provided that the circumferential groove, for example, in the middle part of the housing 16 is arranged.

The pressure reducing valve 10 continues to have a spring 54 on, in the upper housing part 14 is arranged. The feather 54 is on the one hand on a disc 56 at one end against the piston 24 employed and at its other end against an adjusting screw 58 ,

The adjusting screw 58 is in a socket 60 in the upper housing part 14 guided and can via an adjusting nut 62 be moved accordingly.

To rest on the spring 54 is a spring recording 64 provided, that of the adjusting screw 58 facing end of the spring 54 leads and supports accordingly. The free end of the adjusting screw 58 is by means of a removable lid 66 covered.

The valve room 22 and the valve room 46 are by means of a bypass channel 68 fluidly connected to each other. The connection 40 is further arranged so that it to the valve chamber 46 is connected or flows into this.

The membrane 32 is integral to the piston top 26 formed and has a bulge 32a on.

In principle, it can be provided that the membrane 32 has an outer diameter, the outer diameter of the upper housing part 14 and the middle part of the housing 16 equivalent.

In the embodiment shown here, the outer end of the membrane 32 in a circumferential groove in the middle part of the housing 16 hammered in and anchored there.

In the same area is in the upper housing part 14 provided a circumferential groove in which a sealing ring is inserted to achieve a seal here.

The function of the pressure reducing valve 10 can be described as follows:

Through the connection 38 (also called inlet) and over the pipe 42 the fluid flows into the pressure reducing valve 10 on (see arrow in the figure) and with open valve position on through the lower area of the piston bore 20 at the seat seal 34 over in the direction of the connection 40 (also called outlet).

The piston 24 is by the spring 54 according to the setting and preload by the adjusting screw 58 pressed down and thereby opened. The corresponding spring force caused by the preloaded spring 54 with the help of the spring holder 64 acts, holds the pressure reducing valve 10 open.

The strength of the bias of the spring 54 is about adjusting the screw 58 with the mother 62 achieved (here also the use of a spindle is conceivable), so that the spring 54 is biased to the appropriate length.

In the closed position (not shown here), the outlet pressure (pressure in the region of the connection 40 ) above the preset outlet pressure point. The medium then flows over the bypass bore 68 , which in the middle part of the housing 16 is arranged and pushes there against the membrane 32 and parts of the piston top 26 , This pressure, which arises there, thus presses against the spring force 54 , Once the force passes through the medium below the membrane 32 is higher than the permissible outlet pressure or the set spring force 54 , becomes the spring 54 further compressed and the piston 24 is in the piston bore 20 through the membrane 32 and the approach 26a on the piston upper part 26 pulled up.

The integral on the piston lower part 28 arranged seat seal 34 with the circumferential sealing lip 36 seals the piston bore 20 so that an influx of fluid through the piston bore into the port 40 is no longer possible. The inside of the sealing lip 36 Pending pressure increases the sealing effect of the circumferential sealing lip 36 because in the valve room 46 Pending fluid from the inside against the sealing lip 36 these against the lower edge of the piston bore 20 sealingly presses. By the raised piston 24 Thus, the valve is closed and sealed.

If the outlet pressure then drops below the preset value, the pressure also sinks below the membrane 32 again. The piston 24 decreases accordingly and the medium can flow through the valve again.

LIST OF REFERENCE NUMBERS

10

Pressure reducing valve

12

casing

14

Housing top

16

Housing body

18

housing cover

20

piston bore

22

valve chamber

24

piston

26

Piston crown

26a

approach

27

piston seal

27a

sealing lip

28

Piston part

30

thread

32

membrane

32a

bulge

34

seat seal

36

sealing lip

38

first connection

40

second connection

42

pipe section

44

pipe section

46

valve chamber

48

fluid-flow area

50

fluid-free area

52

poetry

54

feather

56

disc

58

adjustment

60

Rifle

62

adjusting

64

spring mount

66

cover

68

bypass channel

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 4434634 B2 [0003]
• EP 2843495 A1 [0004]
• JP 2002157021 A [0005]
• DE 4024487 A1 [0005]
• GB 2071277 A [0005]
• EP 2211247 A2
• US 3902522 [0005]
• FR 2632045 A1 [0005]
• DE 4434634 A1 [0005]

Claims (14)

Pressure reducing valve (10) for liquid and gaseous media, in particular for regulating the pressure in piping systems, preferably in buildings, with a housing (12), wherein the housing (12) has a housing upper part (14), a housing middle part (16) and a housing cover (16). 18), wherein the housing middle part (16) has a piston bore (20), wherein the pressure reducing valve (10) further comprises a membrane (32) for subdividing the housing (12) into a fluid-free and a fluid-flow area (48, 50), the pressure reducing valve (10) further comprising a piston (24) movably guided in the piston bore (20), the piston (24) being connected at one of its ends to the diaphragm (32) and a seat seal (34) at its other end. characterized in that the seat seal (34) is formed substantially by a convexly outwardly or inwardly outwardly encircling sealing lip (36) and / or that the piston on a its ends is integrally connected to the membrane. Pressure reducing valve (10) after Claim 1 , characterized in that the seat seal (34) is hemispherical and / or eierbecherartig formed. Pressure reducing valve (10) after Claim 1 or Claim 2 , characterized in that the sealing lip (36) is at least partially flexible. Pressure reducing valve (10) according to any one of the preceding claims, characterized in that the sealing lip (36) at least partially or completely of fluoropolymers, in particular of polytetrafluoroethylene (PTFE) and / or polyvinylidene fluoride (PVDF) is formed. Pressure reducing valve (10) according to one of the preceding claims, characterized in that in the closed state of the pressure reducing valve (10) the sealing lip (36) is sealingly applied to an edge of the piston bore (20). Pressure reducing valve (10) according to any one of the preceding claims, characterized in that the membrane (32) is integrally formed on the piston (24). Pressure reducing valve (10) according to one of the preceding claims, characterized in that the membrane (32) has an outer diameter which corresponds to the outer diameter of the upper housing part (14) and the middle part of the housing (16) substantially. Pressure reducing valve (10) according to any one of the preceding claims, characterized in that the membrane (32) between the upper housing part (14) and the middle part (16) is held non-positively, positively or materially. Pressure reducing valve (10) according to any one of the preceding claims, characterized in that the membrane (32) has a recess which is in the mounted state movable in a valve chamber (22). Pressure reducing valve (10) according to any one of the preceding claims, characterized in that the membrane (32) cooperates with a sealing element, wherein in the assembled state of the pressure reducing valve (10), the sealing element between the membrane (32) and upper housing part (14) or middle part (16) is arranged. Pressure reducing valve (10) according to one of the preceding claims, characterized in that the piston (24) is designed in several parts. Pressure reducing valve (10) after Claim 11 , characterized in that the piston (24) has a piston upper part (26) and a piston lower part (28). Pressure reducing valve (10) after Claim 12 , characterized in that the piston upper part (26) and the lower piston part (28) are screwed together or clipped together or put on each other, in particular wherein the lower piston part (28) screwed onto the piston upper part (26) or aufgeklippst or plugged. Pressure reducing valve (10) after Claim 12 or Claim 13 , characterized in that a piston seal (27) is provided, which is arranged between piston upper part (26) and lower piston part (28), in particular between the piston upper part (26) and lower piston part (28) is clamped.

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