CN101832399B - Differential pressure valve - Google Patents

Differential pressure valve Download PDF

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Publication number
CN101832399B
CN101832399B CN2010101955670A CN201010195567A CN101832399B CN 101832399 B CN101832399 B CN 101832399B CN 2010101955670 A CN2010101955670 A CN 2010101955670A CN 201010195567 A CN201010195567 A CN 201010195567A CN 101832399 B CN101832399 B CN 101832399B
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China
Prior art keywords
valve
water
cylinder
spool
pressure difference
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CN2010101955670A
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Chinese (zh)
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CN101832399A (en
Inventor
卓旦春
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卓旦春
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Priority to CN2010101955670A priority Critical patent/CN101832399B/en
Publication of CN101832399A publication Critical patent/CN101832399A/en
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Publication of CN101832399B publication Critical patent/CN101832399B/en

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Abstract

The invention provides a differential pressure valve which belongs to the technical field of machinery, solving the problem of low use stability of the traditional pressure-reducing valves. The differential pressure valve comprises a valve body and a valve element, wherein the valve body is internally provided with a control cavity and a water-through cavity which are adjacent up and down; the control cavity is internally provided with a diaphragm dividing the control cavity into a balancing cavity 1 and a balancing cavity 2 which are adjacent up and down; the balancing cavity 1 is internally provided with a spring, and both ends of the spring respectively act on the valve body and the diaphragm; one end of the valve element passes through the balancing cavity 2 and is connected with the diaphragm, while the other end of the valve element is arranged in the water-through cavity; the balancing cavity 2 is provided with a pressure guidance port used for communicating with a water inlet end of a user; and a variable mechanism capable of reducing the opening degree of the differential pressure valve through the action of the valve element when pressure in the balancing cavity 2 increases is arranged between the other end of the valve element and the water-through cavity. Because a connecting cylinder playing a role of guiding is arranged in the water-through cavity, the valve element of the differential pressure valve can stably move in the process of use, thereby increasing the stability of the differential pressure valve.

Description

A kind of pressure difference valve
Technical field
The invention belongs to field of mechanical technique, relate to a kind of valve, particularly a kind of pressure difference valve.
Background technique
Pressure difference valve is a self-balanced differential pressure valve, and it relies on flowing medium self variation in pressure to automatically adjust, and eliminates the residual pressure of pipeline and the flow deviation that pressure surge causes automatically, the pressure reduction of constant user's feed-water end and waterexit end.Pressure difference valve is specially adapted in household metering or the automatic control system, helps the stable system operation.
Chinese patent CN201386795Y " a kind of many spray orifices of the piston type reduction valve " that provide for example; It comprises valve body, valve rod, flap and piston etc., and piston is divided into two neighbouring cavitys with valve body, is provided with spring between piston top and the valve body; Lower part of piston and flap are connected; Elastic force effect lower piston at spring has the trend that moves down, and that is to say that under the elastic force effect of spring, flap has the trend of moving down and reduction valve cuts out.
Can find out that the mechanism of it not being led in the flap moving process in the above-mentioned reduction valve deflection possibly occur in the flap moving process, thereby influence the normal use of reduction valve.
Summary of the invention
The objective of the invention is the problems referred to above, provide a kind of stability in use high, pressure difference valve simple in structure to the existing technology existence.
The object of the invention can be realized through following technical proposal: a kind of pressure difference valve; Comprise valve body and spool; Have neighbouring control chamber and water flowing chamber in the valve body, it is characterized in that, be provided with barrier film in the described control chamber; Barrier film is divided into neighbouring counter balance pocket one and counter balance pocket two with control chamber; Be provided with spring in the counter balance pocket one, the two ends of spring act on respectively on valve body and the barrier film, and an end of said spool passes that counter balance pocket two links to each other with barrier film and the spool the other end is positioned at the water flowing chamber; Described counter balance pocket two places have and are used for the pilot port that is communicated with user's feed-water end, have between the described spool the other end and the water flowing chamber when counter balance pocket two internal pressures to increase the stroking mechanism that can the valve openings degree reduced through the spool action.
This pressure difference valve is installed in user's in the pipe-line system waterexit end, through its balance user's feed-water end and the pressure difference between the waterexit end.Feed-water end has an arm, and the other end of this arm is communicated with the pilot port.
The flowing medium of feed-water end gets in the user in the water flowing process, and flowing medium also can get in the counter balance pocket two.When the hydraulic pressure of feed-water end is bigger; The also corresponding increase of hydraulic pressure in the counter balance pocket two; Hydraulic pressure in the counter balance pocket two overcome spring force to be made on the barrier film and moves, the spool that is connected with barrier film along with on move, on spool after moving make the opening degree of pressure difference valve reduce; The corresponding hydraulic pressure that has just increased the user waterexit end, thus user's the feed-water end and the pressure balance of waterexit end made.
In like manner; When the hydraulic pressure of feed-water end is smaller, also corresponding the reducing of hydraulic pressure in the counter balance pocket two, the hydraulic action force urges barrier film that the elastic force of spring overcomes counter balance pocket two moves down; The spool that is connected with barrier film is along with moving down; Spool after moving down makes the opening degree of pressure difference valve increase, and has just reduced the hydraulic pressure of user waterexit end accordingly, thereby has made user's the feed-water end and the pressure balance of waterexit end.
That is to say that the pressure of user's feed-water end and waterexit end increases simultaneously or reduces under the effect of this pressure difference valve, make the pressure balance of feed-water end and waterexit end all the time.
In above-mentioned pressure difference valve, described stroking mechanism is the connecting cylinder that is tubular and is complementary with the spool the other end, and the above-mentioned spool the other end is positioned at connecting cylinder, and the connecting cylinder sidepiece has the osculum that runs through.
In the moving process, when the spool the other end was positioned at the osculum bottom, the opening degree of pressure difference valve increased the other end of spool in connecting cylinder.When piston is positioned at connecting cylinder bottom the time, this moment, the opening degree of pressure difference valve was maximum.
When the hydraulic pressure of user's feed-water end increased, the pressure in the counter balance pocket two increased, and moved on the spool osculum is partly stopped, made the size decreases of osculum.Because osculum diminishes, and has so just increased the pressure of pressure difference valve water inlet, has correspondingly increased the pressure of user waterexit end.The pressure reduction that has guaranteed user's feed-water end and waterexit end is constant.
When the hydraulic pressure of user's feed-water end reduced, the pressure in the counter balance pocket reduced, and moved on the spool spool is removed by the osculum place, made the size of osculum increase.Because it is big that osculum becomes, and so just reduced pressure difference valve water inlet pressure, correspondingly increased the pressure of user waterexit end.The pressure reduction that has guaranteed user's feed-water end and waterexit end is constant.
In above-mentioned pressure difference valve, described spool by connecting rod be connected in connecting rod wherein the piston of an end form, piston is positioned at above-mentioned connecting cylinder, the other end of connecting rod links to each other with above-mentioned barrier film.
Through connecting rod spool is linked to each other with barrier film, can abut in the connecting cylinder inboard closely through piston.
In above-mentioned pressure difference valve, be provided with Sealing between described connecting rod and the valve body.
Through Sealing the joint between connecting rod and the valve body is sealed.
In above-mentioned pressure difference valve; The two ends in said valve body water flowing chamber are respectively water-inlet cavity and water chamber; The middle part in water flowing chamber has the water port that water-inlet cavity and water chamber are connected; It is inboard that one end of above-mentioned connecting cylinder is resisted against valve body water flowing chamber, and the other end of connecting cylinder communicates against the place, water port and with the water port, has the through hole that runs through on the described piston.
After spool moved, the piston on the spool was blocked the water port, so just whole pressure difference valve was closed.After piston was with the osculum partial occlusion on the connecting cylinder, water by the through hole on water-inlet cavity, osculum, the piston, got in the water chamber successively at last.
In above-mentioned pressure difference valve, said osculum radially evenly distributes along connecting cylinder.
In above-mentioned pressure difference valve, connecting cylinder axial lower dimension in said osculum upper edge is greater than its upper dimension.
Flowing medium is passed through by the osculum place, and the structure of osculum makes water to pass through more smoothly.Simultaneously, through such structure can equal percentage after moving on the spool the pressure at increase water-inlet cavity place.
In above-mentioned pressure difference valve, the joint of the valve body at said connecting cylinder and place, water port is provided with Sealing.
Under the effect of Sealing, avoid flowing medium directly to leak by the valve body joint at connecting cylinder and place, water port.That is to say that the flowing medium at water-inlet cavity place can only get into water chamber through the through hole on osculum and the piston.
In above-mentioned pressure difference valve, be provided with the PRESSURE PIPE that both are communicated with between the water-inlet cavity of said valve body and the counter balance pocket one.Under the effect of PRESSURE PIPE, make the valve inleting water chamber be communicated with counter balance pocket one.
In above-mentioned pressure difference valve, also be provided with the controlling mechanism of ability Regulation spring elastic acting force on the described valve body.
Through the elastic force of controlling mechanism Regulation spring, thereby the pressure difference between balance user feed-water end and the waterexit end is accurately adjusted.
In above-mentioned pressure difference valve, described controlling mechanism comprises the valve rod that is threaded with valve body, and the outer end of valve rod is stretched out valve body and is furnished with handwheel at this end, and valve rod the inner is positioned at counter balance pocket one, and the two ends of above-mentioned spring act on respectively on valve rod the inner and the barrier film.
Rotate in the handwheel process valve rod along with together rotating, thereby valve rod rotates pressuring spring, changes the elastic acting force of spring.
In above-mentioned pressure difference valve, be provided with disc in the counter balance pocket one of said valve body, the other end of above-mentioned spring is resisted against on the disc and disc is pressed on the barrier film.
Avoid spring to act directly on the barrier film through disc, prolong the working life of barrier film.
Compared with prior art, this pressure difference valve is owing to be provided with the connecting cylinder that play the guiding role in the water flowing chamber, and therefore, pressure difference valve in use spool can be stablized mobilely, has increased the stability of pressure difference valve.
Simultaneously, can adjust the active force that puts on the barrier film in the counter balance pocket one, therefore, this pressure difference valve makes and can keep the accurate pressure balance between user's feed-water end and the waterexit end.
In addition, between spring and barrier film, be provided with disc in this pressure difference valve, such structure is not only simple, and has avoided the push premature damage of barrier film because of spring.
Description of drawings
Fig. 1 is that this pressure difference valve is loaded on the structural representation in the pipe-line system.
Fig. 2 is the sectional structure schematic representation of this pressure difference valve.
Fig. 3 is the sectional structure schematic representation at place, water flowing chamber in this pressure difference valve.
Fig. 4 is the structural representation at connecting cylinder place in this pressure difference valve.
Among the figure, 1, valve body; 2, spool; 2a, connecting rod; 2b, piston; 2c, through hole; 3, barrier film; 4, PRESSURE PIPE; 5, control chamber; 5a, counter balance pocket one; 5b, counter balance pocket two; 5c, pilot port; 6, water flowing chamber; 6b, water-inlet cavity; 6c, water chamber; 6d, water port; 7, connecting cylinder; 7a, osculum; 8, valve rod; 9, handwheel; 10, disc; 11, spring.
Embodiment
As shown in Figure 1, this pressure difference valve comprises the valve body 1 that an inside is cavity and the spool 1, spring 11, barrier film 3, PRESSURE PIPE 4 and the connecting cylinder 7 that are arranged in valve body 1.
As depicted in figs. 1 and 2, have two neighbouring cavitys in the valve body 1: control chamber 5 and water flowing chamber 6.Barrier film 3 is arranged in the control chamber, and barrier film 3 is divided into neighbouring counter balance pocket one 5a and counter balance pocket two 5b with control chamber 5.Counter balance pocket two 5b places have the pilot port 5c that it communicates.
Spring 11 is arranged in counter balance pocket one 5a, and the two ends of spring 11 act on respectively on valve body 1 inboard and the barrier film 3.
Spool 2 is made up of piston 2b and connecting rod 2a, and the end of connecting rod 2a passes counter balance pocket two 5b and is connected on the barrier film 3, and the other end of connecting rod 2a and piston 2b are connected and piston 2b is positioned at water flowing chamber 6.In the present embodiment, be provided with Sealing between connecting rod 2a and the valve body 1.
Like Fig. 3 and shown in Figure 4, the two ends in valve body 1 water flowing chamber 6 are respectively the water-inlet cavity 6b and the water chamber 6c of valve, and the middle part in water flowing chamber 6 has the water port 6d that water-inlet cavity 6b and water chamber 6c are connected.The two ends of a PRESSURE PIPE 4 are connected with counter balance pocket one 5a with valve water-inlet cavity 6b respectively.
As shown in Figure 4, connecting cylinder 7 is tubular and is complementary with spool 2 boundary dimension, and the piston 2b of above-mentioned spool 2 is positioned at connecting cylinder 7.It is inboard that one end of connecting cylinder 7 is resisted against the water flowing chamber, and the other end of connecting cylinder is resisted against on the valve body 1 at place, water port, is provided with Sealing in the joint of connecting cylinder 7 and the valve body 1 at 6d place, water port.Connecting cylinder 7 sidepieces radially have some osculum 7a that run through along it, and above-mentioned spool 2 moves back its piston 2b sidepiece can block osculum 7a, and in the present embodiment, the lower dimension of connecting cylinder 7 upper water-out hole 7a is greater than its upper dimension.
As shown in Figure 1, P is that user side, P1 are that feed-water end, P2 are the waterexit end among Fig. 1, and this pressure difference valve is installed in user's in the pipe-line system waterexit end, through its balance user's feed-water end and the pressure difference between the waterexit end.Feed-water end has an arm, and the other end of this arm links to each other with pilot port 5c.
The flowing medium of feed-water end gets in the user in the water flowing process, and flowing medium also can get in counter balance pocket two 5b.When the hydraulic pressure of feed-water end is bigger, the also corresponding increase of hydraulic pressure in counter balance pocket two 5b, the hydraulic pressure in counter balance pocket two 5b overcomes spring 11 elastic force to be made on the barrier film 3 and moves, and drives on the piston 2b piston through connecting rod 2a with barrier film 3 and moves.Flowing medium gets into water chamber 6c by feed-water end chamber 6b, osculum 7a, the through hole 2c of valve body 1 successively; Because the piston 2b after moving makes osculum 7a diminish; So just make the opening degree of pressure difference valve reduce; The corresponding hydraulic pressure that has just increased the user waterexit end, thus user's the feed-water end and the pressure balance of waterexit end made.
In like manner, when the hydraulic pressure of feed-water end is smaller, also corresponding the reducing of hydraulic pressure in counter balance pocket two 5b, the hydraulic action force urges barrier film 3 that the elastic force of spring 11 overcomes counter balance pocket two 5b moves down, and the connecting rod 2a that is connected with barrier film 3 drives piston 2b along with moving down.Flowing medium gets into water chamber 6c by feed-water end chamber 6b, osculum 7a, the through hole 2c of valve body 1 successively; Because the piston 2b after moving makes osculum 7a become big; So just make the opening degree of pressure difference valve increase; The corresponding hydraulic pressure that has just reduced the user waterexit end, thus user's the feed-water end and the pressure balance of waterexit end made.
That is to say that the pressure of user's feed-water end and waterexit end increases simultaneously or reduces under the effect of this pressure difference valve, make the pressure balance of feed-water end and waterexit end all the time.

Claims (7)

1. pressure difference valve; Comprise valve body (1) and spool (2); Have neighbouring control chamber (5) and water flowing chamber (6) in the valve body (1), it is characterized in that, be provided with barrier film (3) in the described control chamber (5); Barrier film (3) is divided into neighbouring counter balance pocket one (5a) and counter balance pocket two (5b) with control chamber (5); Be provided with spring (11) in the counter balance pocket one (5a), the two ends of spring (11) act on respectively on valve body (1) and the barrier film (3), and an end of said spool (2) passes that counter balance pocket two (5b) links to each other with barrier film (3) and spool (2) the other end is positioned at water flowing chamber (6); Described counter balance pocket two (5b) is located to have and is used for the pilot port (5c) that is communicated with user's feed-water end; Have between described spool (2) the other end and water flowing chamber (6) when counter balance pocket two (5b) internal pressure increases and can move the stroking mechanism that the valve openings degree is reduced through spool (2), described stroking mechanism is the connecting cylinder (7) that is tubular and is complementary with spool (2) the other end, and above-mentioned spool (2) the other end is positioned at connecting cylinder (7); Connecting cylinder (7) sidepiece has the osculum (7a) that runs through; Described osculum (7a) radially evenly distributes along connecting cylinder (7), and the axial lower dimension of osculum (7a) upper edge connecting cylinder (7) is greater than its upper dimension, also be provided with on the described valve body (1) can Regulation spring (11) elastic acting force controlling mechanism; Controlling mechanism comprises the valve rod (8) that is threaded with valve body (1); The outer end of valve rod (8) is stretched out valve body (1) and is furnished with handwheel (9) at this end, and valve rod (8) the inner is positioned at counter balance pocket one (5a), and the two ends of above-mentioned spring (11) act on respectively on valve rod (8) the inner and the barrier film (3).
2. pressure difference valve according to claim 1; It is characterized in that; Described spool (2) by connecting rod (2a) and be connected in connecting rod (2a) wherein the piston of an end (2b) form, piston (2b) is positioned at above-mentioned connecting cylinder (7), the other end of connecting rod (2a) links to each other with above-mentioned barrier film (3).
3. pressure difference valve according to claim 2 is characterized in that, is provided with Sealing between described connecting rod (2a) and the valve body (1).
4. pressure difference valve according to claim 3; It is characterized in that; The two ends in described valve body (1) water flowing chamber (6) are respectively water-inlet cavity (6b) and water chamber (6c), and the middle part of water flowing chamber (6) has the water port (6d) that water-inlet cavity (6b) and water chamber (6c) are connected, and an end of above-mentioned connecting cylinder (7) is resisted against inboard, valve body (1) water flowing chamber (6); (6d) locates and communicates with water port (6d) the other end of connecting cylinder (7) against the water port, has the through hole (2c) that runs through on the described piston (2b).
5. pressure difference valve according to claim 4 is characterized in that, described connecting cylinder (7) is provided with Sealing with the joint of the valve body (1) that water port (6d) is located.
6. pressure difference valve according to claim 4 is characterized in that, is provided with the PRESSURE PIPE (4) that both are communicated with between the water-inlet cavity (6b) of described valve body (1) and the counter balance pocket one (5a).
7. pressure difference valve according to claim 6 is characterized in that, is provided with disc (10) in the counter balance pocket one (5a) of described valve body (1), and the other end of above-mentioned spring (11) is resisted against on the disc (10) and disc (10) is pressed on the barrier film (3).
CN2010101955670A 2010-06-09 2010-06-09 Differential pressure valve CN101832399B (en)

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CN101832399B true CN101832399B (en) 2012-07-18

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Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101929574B (en) * 2010-09-19 2012-01-04 卓旦春 Dynamic balance motor-driven pressure-difference valve
CN101929575B (en) * 2010-09-19 2012-05-16 卓旦春 Dynamic differential pressure balancing valve
CN103016770B (en) * 2012-12-08 2015-05-20 中国航天科技集团公司第六研究院第十一研究所 Cutter type isolating valve for maintaining open state of cutter based on medium pressure
JP6474996B2 (en) * 2014-11-13 2019-02-27 トヨタ自動車株式会社 Pressure reducing valve and gas supply device
CN105650302B (en) * 2016-04-01 2018-01-09 天津特克执行器有限公司 Autoclave diaphragm valve with counter balance pocket
CN107701590A (en) * 2017-10-30 2018-02-16 镇江建华轴承有限公司 A kind of bearing (ball) cover structure

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Publication number Priority date Publication date Assignee Title
US4295489A (en) * 1979-10-03 1981-10-20 Fisher Controls Company, Inc. Pilot-operated back pressure regulator
CN2283765Y (en) * 1996-10-30 1998-06-10 四川石油管理局南充机械厂 Pressure release valve for compression natural gas
CN2436743Y (en) * 2000-08-22 2001-06-27 王元军 Self-powered flow control valve
CN2628828Y (en) * 2003-05-31 2004-07-28 河北平衡阀门制造有限公司 Self-operated auto-differential control valve
CN201269320Y (en) * 2008-10-21 2009-07-08 营口流体设备制造(集团)有限公司 Balancing type manual sluice valve
CN201386795Y (en) * 2009-04-24 2010-01-20 永嘉县良盛给排水阀门有限公司 Piston type multi-spraying hole pressure-reducing valve
CN201416648Y (en) * 2009-06-12 2010-03-03 上海平安高压调节阀门有限公司 Temperature and pressure reducing valve

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4295489A (en) * 1979-10-03 1981-10-20 Fisher Controls Company, Inc. Pilot-operated back pressure regulator
CN2283765Y (en) * 1996-10-30 1998-06-10 四川石油管理局南充机械厂 Pressure release valve for compression natural gas
CN2436743Y (en) * 2000-08-22 2001-06-27 王元军 Self-powered flow control valve
CN2628828Y (en) * 2003-05-31 2004-07-28 河北平衡阀门制造有限公司 Self-operated auto-differential control valve
CN201269320Y (en) * 2008-10-21 2009-07-08 营口流体设备制造(集团)有限公司 Balancing type manual sluice valve
CN201386795Y (en) * 2009-04-24 2010-01-20 永嘉县良盛给排水阀门有限公司 Piston type multi-spraying hole pressure-reducing valve
CN201416648Y (en) * 2009-06-12 2010-03-03 上海平安高压调节阀门有限公司 Temperature and pressure reducing valve

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