CN102691814B - There is the back pressure regulating valve of spool - Google Patents

Abstract

A kind of back pressure regulating valve, including: there is the valve body of fluid intake, fluid issuing and centre bore；Cover the bonnet of the spring loaded being operatively coupled to barrier film；And the chamber connected with described fluid inlet.Spool includes housing, is sized to be arranged in described centre bore, and includes Part I, Part II, valve guiding piece and flow channel.Valve seat is arranged in described housing, and valve plug can allow displacement between the open position of flowing and the closed position stoping flowing.Valve plug is combined with valve guiding piece, and spring biases described valve plug towards described open position.Keeper is disposed adjacent with the described Part I of described housing and engages, to be maintained in described housing by described valve plug with a part for described valve plug.

Description

There is the back pressure regulating valve of spool

Technical field

The present invention relates to back pressure regulating valve, more particularly, to the back pressure of the spool using one Regulation valve, in described spool may be mounted to that valve casing.

Background technology

Pressure regulation valve is widely used in controlling fluid in the application with house of various industry Downstream pressure.Such as, in chemical process factory or oil plant, pressure regulation valve is used for grasping Fluid flowing in Ore-controlling Role, to compensate being increased or decreased or the interference of other load of demand, And then the pressure of fluid is controlled in desired scope.As a rule, increase when downstream demand Added-time, pressure regulation valve is opened, to allow more fluid to flow to the downstream part of system by valve, And then maintain the downstream pressure of relative constancy.On the contrary, when downstream demand reduces, pressure regulates Valve cuts out, and to reduce the amount of the fluid flowing through valve, and again maintains the downstream pressure of relative constancy.

On the other hand, back pressure regulating valve can operate under different principles.The above-mentioned pressure mentioned The pressure in the downstream of actuator regulation valve, and the pressure of the upstream side of back pressure regulator control valve By force.Therefore, when the pressure of entrance or upstream side exceedes set point, back pressure regulator is opened.

Summary of the invention

According to an exemplary aspect, back pressure regulating valve includes: valve body, its have fluid intake, Fluid issuing and the centre bore being arranged between described fluid intake and described fluid issuing；Valve Cap, it is coupled to described valve body and covers the spring loaded being operably coupled on barrier film, Described barrier film cooperates with forming chamber with a part for described valve body, and described chamber is via port and institute State fluid inlet connection；And spool, it is arranged in the described centre bore of described valve body. Described spool includes housing, is sized to be arranged in described centre bore, and described housing bag Include Part I, Part II, valve guiding piece and be provided to described chamber and described fluid The flow channel of the flowing connection between outlet.Described spool also includes: valve seat, and it is along institute State flow channel to be arranged in described housing, and be positioned at described Part I and described Part II Between；Valve plug, it is arranged in described housing and can move between an open position and a closed Position, described valve plug includes and the part of described valve guide member engagement, wherein, opens position described Put, it is allowed to through the flowing of described flow channel, on described closed position, stop and pass through The flowing of described flow channel；Spring, it is operably coupled to described valve plug and is configured to court Described open position biases described valve plug；And keeper, itself and described the first of described housing Part is disposed adjacent and engages with a part for described valve plug, described to be maintained at by described valve plug In housing.

According to one or more preferred forms, described back pressure regulator can individually or combination in any Ground includes one or more following exemplary characteristics summarized in paragraph subsequently.Specifically, Described keeper includes cap portion, and it has the retainer being configured to and be coupled to described housing and adjoins Flange, described valve seat is formed by the removable seat ring being arranged in described flow channel, and Including seat ring keeper, it is removably coupled to described housing and is configured to fixing described seat Ring, wherein said retainer is carried by the top of described seat ring keeper.

Described seat ring keeper can include hole, is sized to slideably received within described cap portion, And described cap portion can include hole, and described valve plug can include the described hole that extends into described cap portion In upper pole part, and include spring, described spring is coupled to described cap portion and described valve plug also It is configured to bias described valve plug towards described valve seat.Described seat ring keeper includes aperture, and Wherein said cap portion includes top, is sized to extend in described aperture, and wherein institute State the movement in response to described barrier film of the cap portion.Described housing can include adjacent with described second end Lower opening, described lower opening receives described spring and forms described valve guiding piece, and described valve plug can wrap Include the lower beam portion extended in described lower opening.

The described centre bore of described valve body and the outside of described housing are threaded by cooperate Together, described spool can form single one that can remove from the described centre bore of described valve body Body unit, preferably integral piece.Actuator can be carried by described bonnet, and can be configured to right Described spring loaded applies adjustable preloading, so that described back pressure regulator sets desired In fixed point or neighbouring operation.

According on the other hand, back pressure regulating valve comprises the steps that valve body, and it has fluid intake, stream Body outlet and the centre bore being arranged between described fluid intake and described fluid issuing；Barrier film Assembly, a part for described barrier film cooperates with a part for described valve body, to form chamber, described Chamber is connected with described fluid inlet by port；And spool, it is arranged on described valve body Described centre bore in.Described spool includes: housing, and it is removably mounted at described center In hole and include flow channel, it is configured to permit between described chamber and described fluid issuing Flowing connection；Valve seat, it is arranged in described housing along described flow channel；Valve plug, its It is arranged in described housing and can shift between an open position and a closed, wherein, in institute State on open position, it is allowed to through the flowing of described flow channel, on described closed position, Described valve plug abuts with described valve seat and stops the flowing through described flow channel；First bullet Spring, it is operably coupled to described valve plug and is configured to bias described valve towards described open position Plug；And cap portion, it is operatively coupled to described valve plug, and has and be arranged to and be coupled to The flange that the retainer of described housing engages, to be maintained at described valve plug in described housing.

According to one or more additional preferred forms, described seat ring keeper is configured to institute Stating valve seat and be fixed to described housing, a part for described seat ring keeper forms described retainer. Described valve plug can include upper pole part, and described cap portion is slidably disposed on described seat ring keeper In, described cap portion includes hole, is sized to receive described upper pole part, and includes the second spring, Described cap portion is operationally coupled by it with described valve plug, and is configured to bias institute towards described valve seat State valve plug.Described seat ring keeper includes aperture, and described cap portion can include top, its chi Very little it is adapted to extend in described aperture, and described cap portion is configured in response to described barrier film Move, overcome the power of described second spring to move.

Described housing can include lower opening, and described valve plug can include the lower beam that extends into described hole Portion, described lower beam portion cooperates with described lower opening, to form valve guiding piece, described first spring quilt It is arranged in described lower opening.The described centre bore of described valve body and the outside of described housing are the most logical Cross being threaded togather of cooperation, and the formation of described spool can be from the described center of described valve body The integrated unit that hole removes.Spring loaded may be provided at described bonnet interior and be configured to right Described barrier film applies power, and actuator can be configured to apply adjustable pre-to described spring loaded Load.

According to another preferred aspect, the method assembling back pressure regulating valve comprises the following steps: select Have fluid intake, fluid issuing and be arranged on described fluid intake and described fluid issuing it Between the valve body of centre bore；There is provided diaphragm assembly, so diaphragm assembly is configured so that described A part for a part for barrier film and described valve body cooperate, to form chamber, and provide described chamber and Flowing connection between described fluid intake；And assemble the spool with housing, described housing The described centre bore being sized for insert into described valve body in.It is logical that flowing is set on the housing Road, its flowing being configured to allow between described chamber with described fluid issuing connects, and along described Flow channel arranges valve seat.Valve plug is arranged in described housing, and described valve plug is configured to Can shift between an open position and a closed, wherein, on described open position, it is allowed to Through the flowing of described flow channel, on described closed position, described valve plug and described valve seat Abut, and stop the flowing through described flow channel.First spring is configured to operationally It is couple to described valve plug and is configured to bias described valve plug towards described open position, and cap portion is by coupling Being connected to described valve plug, described cap portion has the corresponding stop being arranged to being coupled to described housing The flange that part engages, to be maintained at described valve plug in described housing.

According to additional preferred form, seat ring keeper can be configured to be fixed to described valve seat Described housing, and described retainer may be disposed in a part for described seat ring keeper.Institute The method of stating comprises the steps that and arranges upper pole part on described valve plug；And described upper pole part is arranged on institute State in the hole in cap portion to allow the slip between described upper pole part and described cap portion to move；And set Putting the second spring, described cap portion is operationally coupled to described valve plug by it, and is configured to towards institute State valve seat and bias described valve plug.Arrange in described cap portion additionally, described method comprises the steps that Portion, is sized to extend in described aperture；And configure described cap portion, so that it rings The movement of barrier film described in Ying Yu, the power of described second spring is overcome to move.Described method also includes: Described valve plug arranges lower beam portion；Lower opening is set on the housing, is sized to receive Described lower beam portion, to form valve guiding piece；And described first spring is arranged on described lower opening In.

Accompanying drawing explanation

Fig. 1 be that the teaching according to the open example of the application first assembles, comprise back pressure and adjust The sectional view of the back pressure regulating valve of joint core.

Fig. 2 is the broken section enlarged drawing of the back pressure regulator cartridge used in the example of fig. 1, It illustrates valve in an open position.

Fig. 3 is another broken section enlarged drawing of the back pressure regulator cartridge of Fig. 2, and it illustrates and is in The valve of closed position.

Fig. 4 is the back pressure regulating valve that the teaching according to the open example of the application second assembles Sectional view.

Fig. 5 is the sectional view of the decompression valve comprising decompression regulation core, described decompression valve Use the valve body identical with the valve body in the back pressure regulating valve of Fig. 1.

Detailed description of the invention

Referring now to accompanying drawing, Fig. 1 illustrate the teaching of the open example of first according to the application assemble and Become and use the back pressure regulating valve 10 (hereinafter referred to " valve 10 ") of spool 12.Valve 10 wraps Including valve body 14, this valve body 14 has fluid intake 16, fluid issuing 18 and is arranged on fluid Centre bore 20 between entrance 16 and fluid issuing 18.Valve 10 includes bonnet 22, this bonnet 22 are coupled to valve body 14, and cover the spring loaded 24 being operably coupled on barrier film 26. Diaphragm plate can also well known to a person skilled in the art that mode is arranged.Barrier film 26 and valve body 14 Recess 28 cooperates, to form chamber 30.Chamber 30 is by port 32 with fluid intake 16 flowing even It is logical, so that chamber 30 is exposed under the upstream of valve 10 or the pressure of fluid inlet side.

Referring now still to Fig. 1, spool 12 is arranged in the centre bore 20 of valve body 14.Spool 10 Including housing 34, it is sized to be arranged in the centre bore 20 of valve body 14.Show shown In example, housing 34 has external screw thread 34a, and the centre bore 20 of valve body 14 has female thread 20a.Other method that housing 34 is connected to valve body 14 also demonstrates that it is feasible.Housing 34 Including top or Part I 36 and bottom or Part II 38.Housing 34 may also include valve and draws Guiding element 40.Housing 34 includes flow channel 42, and it is provided to go out with fluid in chamber 30 Flowing connection between mouth 18, and then fluid intake 16 and fluid issuing 18 are provided effectively Between flowing connection.Valve seat 44 is arranged in housing 34 along flow channel 42, and And be typically between Part I 36 and Part II 38.Valve plug 46 is arranged on shell In 34, and include controlling element 48, be sized to engage valve seat 44.Valve plug 46 can beaten Shift between open position (as shown in Figure 2) and closed position (as shown in Figure 3), wherein, On open position, control element 48 is away from valve seat 44, on closed position, controls element 48 abut with valve seat 44.Therefore, when valve plug 46 is in the open position of Fig. 2, valve 10 Allow from fluid intake 16 by port 32 to chamber 30, and by the flowing through valve seat 44 The flowing of passage 42 to fluid issuing 18.Similarly, it is in the closedown of Fig. 3 when valve plug 46 During position, by controlling the abutting of element 48 and valve seat 44, and then block flow channel 42, And stop flowing.

In the example shown, the bottom 50 of valve plug 46 engages valve guiding piece 40, and spring 52 are operably coupled to valve plug 46, and spring 52 is configured to the open position towards Fig. 2 simultaneously Biasing valve plug 46.Spool 12 also includes keeper (retainer) 54, and it is positioned adjacent to shell The Part I 36 of body 34.Keeper 54 engages the top 55 of valve plug 46, with by valve plug 46 It is maintained in housing 34.

Referring now to Fig. 2 and Fig. 3, in the example shown, keeper 54 shows as having ring-type The form in the cap portion 56 of flange 58, and collar flange 58 is configured to adjacent by extending internally Flange 62 formed corresponding retainer 60.Retainer 60 is carried by housing 34.Valve seat 44 are arranged on the installation region 64 being formed in housing 34, and in the example shown, valve Seat 44 is in position by seat ring keeper 66.Seat ring keeper 66 includes external screw thread 66a, its Being threaded in the hole 68 with female thread 68a, female thread 68a is formed at the top of shell 34 36.In the example shown, retainer 60 and flange 62 are of seat ring keeper 66 Point.More specifically, retainer 60 and flange 62 are formed by the top 70 of seat ring keeper 66.

The top 55 of valve plug extends upward from controlling element 48, and bottom 50 is from controlling element 48 extend downward.Seat ring keeper 66 has endoporus 72, and the collar flange in cap portion 56 58 be suitably sized to is slidably received in endoporus 72.Cap portion 56 includes hole 74, and The top 55 being suitably sized to reception valve plug 46 in this hole 74.Spring 76 is arranged on control unit In space 78 between part 48 and cap portion 56.In the example shown, spring 76 relies on Control on the lower surface 58a of the upper surface 48a of element 48 and the flange 58 in cap portion 56.Cause This, spring 76 applies bias force to valve plug 46, to drive valve plug and then to drive control element 48 Closed position towards Fig. 3 is moved.

Seat ring keeper 66 includes aperture 80, is sized to allow at least one of cap portion 56 Divide and extend through aperture 80 (seeing Fig. 2), and the top 46a of valve plug 46 can be in cap portion 56 Hole 74 in slide.Therefore, when barrier film 26 is pressed in cap portion 56, control element 48 right The power of valve seat 44 is controlled by the power of spring 76, and the power of described spring 76 prevents barrier film/load Control element 48 and/or valve seat 44 are caused damage because power is excessive by spring assembly.Spring loaded The power of 24 pairs of barrier films 26 can be controlled by actuator 77 (Fig. 1), and this makes the valve 10 can be in institute Open on desired set point, as is well understood in the art.

Referring now still to Fig. 2 and 3, the bottom 50 of valve plug 46 extends into and is formed at housing 34 times In hole 82, this lower opening 82 is the most adjacent with the bottom 38 of housing 34.In the example shown, Hole 82 is blind hole.Spring 52 is arranged in hole 82, and with the bottom in hole 82 and by valve plug The abutment 86 of bottom 50 carrying of 46 engages.Therefore, spring 52 is along making valve plug 46 Away from valve seat 44 and to the direction that the open position of Fig. 2 moves, valve plug 46 is applied bias force.

This other places, lower opening 82 contributes to forming at least some of of valve guiding piece 40.Further , the cap portion 56 being arranged in the hole 72 of seat ring keeper 66 and the valve being arranged in hole 74 The top 55 of plug 46 combines, or contributes to realizing valve individually together with lower opening 82 and guides Function.It will be appreciated by those skilled in the art that cap portion 56 and seat ring keeper 66 are configured to Allow the flowing by space 78 to valve seat/control component element from chamber 30.

In operation, user generally uses the load on actuator 77 regulating load spring 24, So that valve seat 10 opens and closes on desired set point.Owing to chamber 30 is by port 32 Being exposed under the pressure of the upstream of valve 10 or fluid inlet side, therefore, valve 10 will keep On closed position, until the making every effort to overcome upward on the barrier film 26 that caused by the pressure in chamber 30 Till taking the spring 24 power down to barrier film 26.When the pressure in chamber 30 exceedes set point Time, barrier film 26 moves upward, it is allowed to spring 84 promotes valve plug 46 upward, and then makes control Element 48 processed lifts off a seat 44 and the mobile open position to Fig. 2.

Valve 10 will stay open, until upstream pressure drops below desired set point and is Stop, and make valve plug/control element return on the closed position of Fig. 3, wherein, at this set point On, the power down of spring loaded/diaphragm assembly is more than by the fluid pressure generation in chamber 30 Power upward.

Referring now to Fig. 4, it is shown that use the control valve 110 of the spool 112 of simple type.Valve 110 Preferably include identical valve body 14 discussed above, this valve body 14 include fluid intake 16, Fluid issuing 18 and centre bore 20.Additionally, control valve 110 include identical bonnet 22, Spring loaded 24, barrier film 26, recess 28, chamber 30 and port 32.In the example of fig. 4, Shell 134 includes central flow passage 142.The lower surface of barrier film 126 is directly and valve seat 144 Abut, so that barrier film 126 is effectively formed control element 148.Valve seat 144 is preferably by closing Suitable material is formed, to provide the sufficient sealing between barrier film 126 and valve seat 144.This valve Seat can include O 146.

In operation, valve 110 is according to the ultimate principle running identical with valve 10.Specifically, Chamber 30 is exposed under the pressure of the upstream of valve 10 or fluid inlet side by port 32, And valve will remain on the closed position of Fig. 4, until the barrier film caused by the pressure in chamber 30 Till power upward on 126 overcomes the spring 24 power down to barrier film 126.When chamber 30 In pressure when exceeding setting value, barrier film 126 moves upward, so that barrier film 126/ controls unit Part 148 moves to open position away from valve seat 144, it is allowed to chamber 30 and central flow passage Flowing connection between 142, allows for the stream between fluid intake 16 and fluid issuing 18 Dynamic connection.

As valve 10 described above, valve 110 will stay open, until under upstream pressure Till falling below desired set point, and valve plug/control element returns on closed position, Wherein, on this set point, the power down of spring loaded/diaphragm assembly is more than by chamber 30 Fluid pressure produce power upward.

According to disclosed example, spool 12 can remove the list as individually one from valve body 14 Unit, it includes such as housing 34, valve plug 46, keeper 54 and other portion relevant to core Part.For spool 12 above-mentioned one or modular design many potential advantages can be provided. Such as, by using standardized valve body 14, can be using backpressure regulation spool 14 as individually Unit removes, and is inserted in the relief pressure valve cartridge 200 of the type shown in the pressure reducing regulator of Fig. 5. Certainly, vice versa, therefore, it can be made easily the pressure reducing regulator of Fig. 5 to be converted back to figure The back pressure regulating valve of 1.As shown in Fig. 1, Fig. 4 or Fig. 5, the chi of the bottom of centre bore 20 Very little being suitable to receives the core 12 of Fig. 1, the core of Fig. 4 or the bottom of the shell 34 of the core of Fig. 5 38.Additional details about the spool 100 of the pressure reducing regulator of Fig. 5 can be at serial number Finding in the U.S. Patent application of 12/496868, this application is co-pending and jointly authorizes, its Full content is incorporated herein by reference.

According to the one or more aspects in disclosed example, it is designed to coordinate the mark in valve body Back pressure cartridge in standardization core port can replace decompression core simply by with back pressure cartridge, makes decompression adjust Joint device is easily converted to back pressure regulator, and vice versa.Therefore, single standardization valve Body can be used as any type of actuator.Two different types of tune are constructed from identical valve body The ability of joint device simplifies manufacture and makes field maintenance simpler.Example disclosed herein also may be used Using the back pressure cartridge filtered, it can provide the protection to valve seat, and can be used in balanced design, Apply for higher pressure.The disclosure can be put the most in proportion according to various flow demand Big or reduce.

The preferred embodiment of disclosure application be described herein as including known for inventor Good mode is to implement the present invention.Although illustrate and describe multiple example, but people in the art Member is it should be readily understood that the details of various embodiment is the most mutually exclusive.On the contrary, ability Field technique personnel are by reading teaching in this, it should can one or more by an embodiment Feature is combined with one or more features of remaining embodiment.Also, it is to be understood that institute The embodiment shown is merely exemplary, and should not be taken as limiting the scope of the invention.All Method described herein can be carried out in any suitable order, refers to except as otherwise noted or clearly Go out contrary.Any and all embodiment that present document relates to, or exemplary language (such as, " example As ") use be only used to preferably to illustrate the present invention exemplary embodiment in terms of, and Do not limit the scope of the present invention.It is right that all language in description should be construed as indicating The present invention puts into practice necessary undesired element.

Claims (20)

1. a back pressure regulating valve, including:

Valve body, it has fluid intake, fluid issuing and is arranged on described fluid intake and institute State the centre bore between fluid issuing；

Bonnet, it is coupled to described valve body and covers the load being operably coupled on barrier film Spring, described barrier film cooperates with forming chamber with a part for described valve body, and described chamber is via port Connect with described fluid inlet；And

Spool, it is arranged in the described centre bore of described valve body, and described spool includes:

Housing, is sized to be arranged in described centre bore, and described housing includes first Point, Part II, valve guiding piece and be provided to described chamber and described fluid issuing Between flowing connection flow channel；

Valve seat, it is arranged in described housing along described flow channel, and is positioned at described Between a part of and described Part II；

Valve plug, it is arranged in described housing and can move between an open position and a closed Position, described valve plug includes and the part of described valve guide member engagement, wherein, beats described On open position, it is allowed to through the flowing of described flow channel, on described closed position,

Stop the flowing through described flow channel；

First spring, it is operably coupled to described valve plug and is configured to open position towards described Put the described valve plug of biasing；

Keeper, its arrange neighbouring described housing described Part I and with described valve plug A part engages, to be maintained in described housing by described valve plug；And

Second spring, it is operatively coupled to described keeper and described valve plug, and described second Spring is configured to bias described valve plug towards described valve seat.

2. back pressure regulating valve as claimed in claim 1, it is characterised in that described keeper bag Including cap portion, it has the flange that the retainer being configured to and be coupled to described housing is adjacent.

3. such as back pressure regulating valve in any one of the preceding claims wherein, it is characterised in that institute State valve seat to be formed by the removable seat ring being arranged in described flow channel, and include that seat ring is protected Gripping member, it is removably coupled to described housing and is configured to fixing described seat ring, and wherein Retainer is carried by the top of described seat ring keeper.

4. back pressure regulating valve as claimed in claim 3, it is characterised in that described seat ring keeps Part includes the first hole, is sized to slideably received within described cap portion, and wherein said cap portion Including the second hole, wherein said valve plug includes extending in described second hole in described cap portion Upper pole part, and wherein said second spring is coupled to described cap portion and described valve plug.

5. back pressure regulating valve as claimed in claim 3, it is characterised in that described seat ring keeps Part includes aperture, and wherein said cap portion includes top, is sized to extend into described In upper aperture, and wherein said cap portion is in response to the movement of described barrier film.

6. back pressure regulating valve as claimed in claim 1, it is characterised in that described housing includes The lower opening adjacent with described Part II, described lower opening receives described first spring and is formed described Valve guiding piece, and wherein said valve plug includes the lower beam portion that extends in described lower opening.

7. back pressure regulating valve as claimed in claim 1, it is characterised in that the institute of described valve body State outside being threaded togather by cooperation of centre bore and described housing, and wherein said Spool forms the single integrated unit that can remove from the described centre bore of described valve body.

8. back pressure regulating valve as claimed in claim 1, it is characterised in that include actuator, It is carried by described bonnet, and is configured to described spring loaded is applied adjustable preloading.

9. a back pressure regulating valve, including:

Valve body, it has fluid intake, fluid issuing and is arranged on described fluid intake and institute State the centre bore between fluid issuing；

Diaphragm assembly, a part for described diaphragm assembly cooperates with a part for described valve body, with Forming chamber, described chamber is connected with described fluid inlet by port；And

Spool, it is arranged in the described centre bore of described valve body, and described spool includes:

Housing, it is removably mounted in described centre bore, and described housing includes that flowing is logical Road, its flowing being configured to permit between described chamber with described fluid issuing connects；

Valve seat, it is arranged in described housing along described flow channel；

Valve plug, it is arranged in described housing and can move between an open position and a closed Position, wherein, on described open position, it is allowed to through the flowing of described flow channel, On described closed position, described valve plug abuts with described valve seat and stops through described stream The flowing of dynamic passage；

First spring, it is operably coupled to described valve plug and is configured to open position towards described Put the described valve plug of biasing；

Cap portion, it is operatively coupled to described valve plug, and has and be arranged to and be coupled to institute State the flange that the retainer of housing engages, to be maintained in described housing by described valve plug；

And

Second spring, described cap portion operationally couples by it with described valve plug, and described second Spring is configured to bias described valve plug towards described valve seat.

10. back pressure regulating valve as claimed in claim 9, it is characterised in that include that seat ring is protected Gripping member, it is configured to be fixed to described valve seat described housing, the one of described seat ring keeper Part forms described retainer.

11. back pressure regulating valves as claimed in claim 10, it is characterised in that described valve plug Including upper pole part, and wherein said cap portion is slidably disposed in described seat ring keeper, institute State cap portion and include hole, be sized to receive described upper pole part.

12. back pressure regulating valves as claimed in claim 11, it is characterised in that described seat ring Keeper includes aperture, and wherein said cap portion includes top, is sized to extend into In described upper aperture, and wherein said cap portion be configured in response to described barrier film movement, gram The power taking described second spring moves.

13. back pressure regulating valves as claimed in claim 9, it is characterised in that described housing bag Include lower opening, and described valve plug include the lower beam portion that extends into described lower opening, described lower beam portion with Described lower opening cooperates, and to form valve guiding piece, and wherein said first spring is arranged on described In lower opening.

14. back pressure regulating valves as claimed in claim 9, it is characterised in that described valve body The outside of described centre bore and described housing is threaded togather by cooperation, and wherein institute State spool and form the integrated unit that can remove from the described centre bore of described valve body.

15. back pressure regulating valves as claimed in claim 9, it is characterised in that include loading bullet Spring, this spring loaded is arranged on described bonnet interior and is configured to apply described barrier film Power, and include actuator, it is configured to apply described spring loaded adjustable preloading Lotus.

16. 1 kinds of methods assembling back pressure regulating valve, comprise the following steps:

Selecting valve body, described valve body has fluid intake, fluid issuing and is arranged on described stream Centre bore between body entrance and described fluid issuing；

Thering is provided diaphragm assembly, described diaphragm assembly is arranged such that so that described diaphragm assembly Part cooperates with a part for described valve body, to form chamber, and provides described chamber and described fluid Flowing connection between entrance；

Assembling the integrated unit that spool becomes single, described single integrated unit has shell Body, in the described centre bore being sized for insert into described valve body of described housing；

Flow channel is set on the housing, described flow channel be configured to allow for described chamber with Flowing connection between described fluid issuing；

On the housing valve seat is set along described flow channel；

Valve plug is placed in described housing, and described valve plug is configured to can open position with Shift between closed position, wherein, on described open position, it is allowed to lead to through described flowing The flowing in road, on described closed position, described valve plug abuts with described valve seat, and stops warp Cross the flowing of described flow channel；

Arranging the first spring, it is operably coupled to described valve plug and is configured to open towards described Valve plug described in location bias；

Cap portion is coupled to described valve plug, and described cap portion has and is arranged to and be coupled to described housing Corresponding retainer engage flange, so that described valve plug is maintained in described housing；And Arranging the second spring, described cap portion is operationally couple to described valve plug and is configured to by it Described valve plug is biased towards described valve seat.

17. methods as claimed in claim 16, it is characterised in that also include: seat is provided Ring retainer, it is configured to be fixed to described valve seat described housing, and by described retainer It is arranged in a part for described seat ring keeper.

18. methods as claimed in claim 16, it is characterised in that including: at described valve Upper pole part is set beyond the Great Wall, and described upper pole part is arranged in the hole in described cap portion to allow described Slip between upper pole part and described cap portion is moved.

19. methods as claimed in claim 18, it is characterised in that including: at described seat Aperture is set in ring retainer, and top is set in described cap portion, be sized to extend Enter in described upper aperture, and configure described cap portion, so that it is in response to described diaphragm assembly Movement, overcome the power of described second spring to move.

20. methods as claimed in claim 16, it is characterised in that including: at described valve Lower beam portion is set beyond the Great Wall, and lower opening is set on the housing, be sized to receive described under Bar portion, to form valve guiding piece, and is arranged on described first spring in described lower opening.