CN101718361B - Constant-pressure check valve - Google Patents
Constant-pressure check valve Download PDFInfo
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- CN101718361B CN101718361B CN201010103885XA CN201010103885A CN101718361B CN 101718361 B CN101718361 B CN 101718361B CN 201010103885X A CN201010103885X A CN 201010103885XA CN 201010103885 A CN201010103885 A CN 201010103885A CN 101718361 B CN101718361 B CN 101718361B
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- pressure
- piston ring
- spool
- pressure chamber
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Abstract
The invention relates to a valve, in particular to a constant-pressure check valve comprising a valve body, a valve cover, a valve core, a medium access channel, a medium outflow channel and a connection channel, wherein the connection channel is used for communicating the medium access channel and the medium outflow channel, a pressure cavity is arranged between the valve cover and the valve body, a spring is arranged in the pressure cavity, a seal piece is arranged between the valve core and the connection channel, a channel is arranged between the medium access channel and the pressure cavity and is used for mutually communicating the medium access channel and the pressure cavity, a connection path is arranged between the medium outflow channel and the pressure cavity and is used for mutually communicating the medium outflow channel and the pressure cavity, a pressure discharge valve is arranged on the connection path, a piston ring is arranged between the valve core and the spring, one end of the piston ring is movably connected with the valve core, the other end of the piston ring supports against the spring, and a pressure storing cavity is arranged between the piston ring and the valve core and is communicated with the medium outflow channel. The constant-pressure check valve has good seal performance and compact structure, is stably opened and reduces the production cost.
Description
Technical field
The present invention relates to a kind of valve, particularly a kind of constant-pressure check valve.
Background technique
Safety check mainly is installed on fluid-transporting tubing or is used for the medium transport pipeline of special operation condition, so that stop the backflow of fluid or special media.
At present, the safety check on market and the data mainly by valve body, valve gap, be located at medium inlet passage, medium flow pass on the valve body, the connecting passage and the spool that are used to be communicated with medium inlet passage and medium flow pass constitute.
The safety check that is used for special occasions need be opened under the pressure of setting, valve closing when the pressure of inlet passage is lower than the pressure of this setting, the constant-pressure check valve of this specific (special) requirements normally is provided with a spring above spool, realize the constant pressure turn on of valve by the size of adjusting initial tension of spring, because the cracking pressure of this type of constant-pressure check valve depends on the load of spring action on spool fully, if require safety check is set in unlatching under the very high pressure, then need very big spring load, promptly require the cracking pressure of safety check high more, needed spring force is just big more, the diameter of spring and volume are also big more, but the manufacturing of big spring is difficulty very, in addition, if spring is very big, it is very big that the volume of valve also can become, so the manufacture cost of valve also can be very high.
Summary of the invention
At the deficiency that prior art exists, the constant-pressure check valve that the invention provides a kind of good seal performance, opens stable, compact structure, can reduce production costs.
For achieving the above object, the invention provides following technological scheme: a kind of constant-pressure check valve, include valve body, valve gap, spool, be located at the medium inlet passage on the valve body, the medium flow pass, be used to be communicated with the connecting passage of medium inlet passage and medium flow pass, be provided with the pressure chamber of placing slippage for spool between valve gap and the valve body, be provided with spring in this pressure chamber, be provided with Sealing between spool and the connecting passage, spool and connecting passage sealing, constitute the sealing of medium inlet passage and medium flow pass, spool separates with connecting passage, constitute the conducting of medium inlet passage and medium flow pass, be provided with the passage of mutual conduction between described medium inlet passage and the pressure chamber, be provided with being connected of communicating with one another between medium flow pass and the pressure chamber, connect the road and be provided with Pressure Relief Valve, be provided with piston ring between described spool and the spring, one end and the spool of this piston ring are movably connected, the other end and spring are conflicted, the inwall axial seal slippage of the side of piston ring and pressure chamber, be provided with pressure-storing cavity between piston ring and the spool, this pressure-storing cavity and the conducting of medium flow pass.
Wherein, the end face that piston ring and spool flexibly connect an end is provided with chute, spool is provided with the slide block adaptive with this chute, leave the space between the top end of slide block and the bottom end of chute, this space is a pressure-storing cavity, and the side of piston ring offers respectively the attachment hole with pressure-storing cavity and the conducting of medium flow pass.
Adopt technique scheme, after the pretightening force and connecting passage applying of spool by spring, medium is entered by the medium inlet passage of valve body, after medium enters into the medium inlet passage, entered in the pressure chamber by the passage of being located between medium inlet passage and the pressure chamber, the pressure in the pressure chamber impels spool and connecting passage sealing, at this moment, pressure in the medium inlet passage is lower than the force value of setting, and medium inlet passage and medium flow pass are in cut-off state; When the pressure in the medium inlet passage is higher than the force value of setting, being in the pressure Decompression valves that connects on the road opens, and pressure in the pressure chamber and medium are drained into the medium flow pass by connecting the road, spool breaks away from sealing with connecting passage under the pressure medium effect of medium inlet passage, make medium inlet passage and the conducting of medium flow pass.If the pressure of medium inlet passage is lower than the pressure of setting, then Pressure Relief Valve is closed, and the pressure of pressure chamber raises, and under the acting in conjunction of the pressure medium of pressure chamber and spring force, spool seals valve closing with connecting passage.If the pressure in the medium flow pass is higher than the pressure of medium inlet passage, this moment, refluxing appearred in medium, medium that refluxes and pressure can enter the pressure-storing cavity (attachment hole of being offered by the piston ring side enters) between piston ring and the spool, thereby spool is compressed, impel the sealing of spool and connecting passage, prevent the backflow of medium, guaranteed non-return, the pressure of medium flow pass is big more, and the power that medium acts on the spool is big more, and the sealing between spool and the connecting passage is tight more.Meanwhile, when the pressure in the medium flow pass is higher than the pressure of medium inlet passage, piston ring will by on push away, the annular boss that is arranged on the piston ring bottom can push away in the continuation of limited piston ring, can protect spring can not damaged by excessive compression.The sealing of spool and connecting passage mainly relies on medium power, and spring only plays the effect of pretension, even be under the hyperbaric environment, also need not to use very big spring, after the spring design was small and exquisite, therefore the compact that valve body also can design can save production cost; The interference of other pressure or parts can be avoided in the position that Pressure Relief Valve is in, and its unlatching or the sensitivity of closing get a promotion, and unlatching when making valve body be in level pressure or the sensitivity of closing improve.
The present invention further is set to: medium inlet passage and passage between the pressure chamber are that an end is connected with valve body and extends in the medium inlet passage, the suction side conducting formation that the other end penetrates valve gap and is communicated with pressure chamber, being connected between described medium flow pass and the pressure chamber is that an end penetrates valve gap and is communicated with pressure chamber, the other end is connected with valve body and extends to the interior outlet side conduit of medium flow pass, and described pressure Decompression valves is located on this outlet side conduit.
Wherein, the cross section of suction side conduit and outlet side conduit is " U " type respectively, and all is in the top of valve body.
Adopt technique scheme, with passage and connect the road and be arranged to suction side conduit and outlet side conduit and help being communicated with and processing of medium inlet passage and medium flow pass and pressure chamber; And the cross section of suction side conduit and outlet side conduit is " U " type respectively, and the top that all is in valve body then is the placement and the installation of valve body for convenience.
The present invention further is set to: the end face that piston ring and spring are conflicted is provided with annular short slot, and spring is in this annular short slot, and the side of piston ring is provided with seal ring, constitutes the sealing with pressure chamber.
Adopt technique scheme, the setting of annular short slot can be played the effect of spring seat on the piston ring, with this spring is positioned, prevent to take place when spring from conflicting to be offset and to have influence on spring force, piston ring side seals circle has guaranteed the sealing between piston ring and the pressure chamber, prevents that pressure chamber from leaking and have influence on the unlatching of valve body.
The present invention further is set to: piston ring and pressure chamber between be provided with bounding means, this bounding means is the positive stop lug boss of being located on the piston ring outer circumferential face, the bottom end of positive stop lug boss and pressure chamber wall is conflicted and is constituted the spacing of piston ring.
Adopt technique scheme, the setting of piston ring upper limit boss can prevent that pressure in the medium inlet passage is excessive and piston ring continued to promote and cause the damage of spring.
Below in conjunction with accompanying drawing the present invention is further described:
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention;
Fig. 2 is the A-A part sectioned view of Fig. 1.
Embodiment
As Fig. 1, a kind of constant-pressure check valve shown in Figure 2, include valve body 1, valve gap 2, spool 3, be located at the medium inlet passage 11 on the valve body 1, medium flow pass 12, be used to be communicated with the connecting passage 13 of medium inlet passage 11 and medium flow pass 12, be provided with between valve gap 2 and the valve body 1 for spool 3 and place the pressure chamber 14 of slippage, be provided with spring 4 in this pressure chamber 14, be provided with Sealing 15 between spool 3 and the connecting passage 13, during valve closing, spool 3 and connecting passage 13 sealings, constitute the sealing of medium inlet passage 11 and medium flow pass 12, during valve opening, spool 3 separates with connecting passage 13, constitute the conducting of medium inlet passage 11 and medium flow pass 12, be provided with the passage of mutual conduction between medium inlet passage 11 and the pressure chamber 14, be provided with being connected of communicating with one another between medium flow pass 11 and the pressure chamber 14, connect the road and be provided with Pressure Relief Valve 5, be provided with piston ring 6 between spool 3 and the spring 4, one end and the spool 3 of this piston ring 6 are movably connected, the other end and spring 4 are conflicted, the inwall axial seal slippage of the side of piston ring 6 and pressure chamber 14, be provided with pressure-storing cavity 61 between piston ring 6 and the spool 3, this pressure-storing cavity 61 and 12 conductings of medium flow pass.After the pretightening force and connecting passage 13 applyings of spool 3 by spring 4, medium is entered by the medium inlet passage 11 of valve body 1, after medium enters into medium inlet passage 11, enter in the pressure chamber 14 by the passage of being located between medium inlet passage 11 and the pressure chamber 14, the pressure in the pressure chamber 14 and the pretightening force of spring 4 are impelled spool 3 and connecting passage 13 sealings, at this moment, pressure in the medium inlet passage 11 is lower than the force value of setting, medium inlet passage 11 is in cut-off state with medium flow pass 12, and since the area of pressure chamber 14 greater than the sealing surface of spool 3 with connecting passage 13, so the pressure in the medium inlet passage 11 is big more, the sealing between spool 3 and the connecting passage 13 is tight more; When the pressure in the medium inlet passage 11 is higher than the force value of setting, Pressure Relief Valve 5 is opened, and pressure and media in the pressure chamber 14 are drained into medium flow pass 12 by connecting road 8, spool 3 breaks away from sealing with connecting passage 13, makes medium inlet passage 11 and 12 conductings of medium flow pass.When if refluxing appears in the medium in the medium flow pass 12, medium that refluxes and pressure can enter the pressure-storing cavity 61 (attachment hole of being offered by piston ring 6 sides 62 enters) between piston ring 6 and the spool 3, thereby spool 3 is compressed, impel spool 3 and connecting passage 13 sealings, when having guaranteed non-return, also improved sealability, the pressure that medium flow pass 12 refluxes is big more, and the sealing between spool 3 and the connecting passage 13 is tight more.Above-mentioned spring 4 only plays the effect of pretension, even be under the hyperbaric environment, also need not to use very big spring, and after spring 4 designs were small and exquisite, the volume of valve body 1 also need not to increase, and has saved cost of production; Pressure Decompression valves 5 can be avoided the interference of other pressure or parts, and its unlatching or the sensitivity of closing get a promotion, and unlatching when making valve body 1 be in level pressure or the sensitivity of closing improve.
In embodiments of the present invention, piston ring 6 is provided with chute 63 with the end face that spool 3 flexibly connects an end, and spool 3 is provided with the slide block 31 adaptive with this chute 63, and the cross section of chute 63 is generally circle, rectangle or rhombus also are feasible, and the shape of slide block 31 is adaptive with it to get final product; Leave the space between the top end 311 of slide block 31 and the bottom end 631 of chute 63, this space is a pressure-storing cavity 61, the side of piston ring 6 offers respectively the attachment hole 62 with pressure-storing cavity 61 and 12 conductings of medium flow pass, when medium back flow, medium and pressure or entered in the storage chamber 61 by this attachment hole 62 are implemented compressing spool 3 with this.
Setting of passage and connecting passage for convenience and convenient processing, medium inlet passage 11 in the embodiment of the invention and passage between the pressure chamber 14 are that an end is connected with valve body 1 and extends in the medium inlet passage 11, and the other end penetrates valve gap 2 and the suction side conduit 7 that is communicated with pressure chamber 14 constitutes.Being connected between medium flow pass 12 and the pressure chamber 14 is that an end penetrates valve gap 2 and is communicated with pressure chamber 14, and the other end is connected with valve body 1 and extends to outlet side conduit 8 in the medium flow pass 12, and pressure Decompression valves 5 is located on this outlet side conduit 8.And the cross section of suction side conduit 7 and outlet side conduit 8 is " U " type respectively, and all be in the top of valve body 1, the placement and the installation that have made things convenient for valve body 1 are set like this, need to prove, suction side conduit 7 and outlet side conduit 8 also can be located at the side of valve body 1.
In embodiments of the present invention, the sealing between piston ring 6 and the pressure chamber 14 is implemented by the seal ring 64 of being located at piston ring 6 sides, when effectively preventing piston ring 6 with pressure chamber 14 slippages, and the pressure leakage in the pressure chamber 14; Piston ring 6 is provided with annular short slot 65 with the end face that spring 4 is conflicted, and spring 4 is in this annular short slot 65; Annular short slot 65 is a spring seat in fact, plays the effect to spring 4 location, prevents that spring 4 and its enforcement conflict place from skew taking place and have influence on preloading spring power.In order to prevent to follow the string after spring 4 overvoltages, piston ring 6 and pressure chamber 14 between be provided with bounding means 66, this bounding means 66 is for being located at the positive stop lug boss on piston ring 6 outer circumferential faces, and the bottom end 141 of positive stop lug boss and pressure chamber 14 walls is conflicted and constituted the spacing of piston ring.
Claims (6)
1. constant-pressure check valve, include valve body, valve gap, spool, be located at the medium inlet passage on the valve body, the medium flow pass, be used to be communicated with the connecting passage of medium inlet passage and medium flow pass, be provided with the pressure chamber of placing slippage for spool between valve gap and the valve body, be provided with spring in this pressure chamber, be provided with Sealing between spool and the connecting passage, spool and connecting passage sealing, constitute the sealing of medium inlet passage and medium flow pass, spool separates with connecting passage, constitute the conducting of medium inlet passage and medium flow pass, it is characterized in that: the passage that is provided with mutual conduction between described medium inlet passage and the pressure chamber, be provided with being connected of communicating with one another between medium flow pass and the pressure chamber, connect the road and be provided with the pressure Decompression valves, be provided with piston ring between described spool and the spring, one end and the spool of this piston ring are movably connected, the other end and spring are conflicted, the inwall axial seal slippage of the side of piston ring and pressure chamber, be provided with pressure-storing cavity between piston ring and the spool, this pressure-storing cavity and the conducting of medium flow pass.
2. constant-pressure check valve according to claim 1, it is characterized in that: the end face that described piston ring and spool flexibly connect an end is provided with chute, spool is provided with the slide block adaptive with this chute, leave the space between the top end of slide block and the bottom end of chute, this space is a pressure-storing cavity, and the side of piston ring offers respectively the attachment hole with pressure-storing cavity and the conducting of medium flow pass.
3. constant-pressure check valve according to claim 1, it is characterized in that: described medium inlet passage and passage between the pressure chamber are that an end is connected with valve body and extends in the medium inlet passage, the suction side conducting formation that the other end penetrates valve gap and is communicated with pressure chamber, being connected between described medium flow pass and the pressure chamber is that an end penetrates valve gap and is communicated with pressure chamber, the other end is connected with valve body and extends to the interior outlet side conduit of medium flow pass, and described pressure Decompression valves is located on this outlet side conduit.
4. constant-pressure check valve according to claim 3 is characterized in that: the cross section of described suction side conducting and outlet side conduit is " U " type respectively, and all is in the top or the side of valve body of valve body.
5. constant-pressure check valve according to claim 1 and 2 is characterized in that: the end face that described piston ring and spring are conflicted is provided with annular short slot, and spring is in this annular short slot, and the side edge of piston ring is provided with seal ring, constitutes the sealing with pressure chamber.
6. constant-pressure check valve according to claim 1 and 2, it is characterized in that: described piston ring and pressure chamber between be provided with bounding means, this bounding means is the positive stop lug boss of being located on the piston ring outer circumferential face, and the bottom end of positive stop lug boss and pressure chamber wall is conflicted and constituted the spacing of piston ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010103885XA CN101718361B (en) | 2010-01-27 | 2010-01-27 | Constant-pressure check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010103885XA CN101718361B (en) | 2010-01-27 | 2010-01-27 | Constant-pressure check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101718361A CN101718361A (en) | 2010-06-02 |
| CN101718361B true CN101718361B (en) | 2011-07-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010103885XA Active CN101718361B (en) | 2010-01-27 | 2010-01-27 | Constant-pressure check valve |
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| CN (1) | CN101718361B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105358885B (en) * | 2013-10-02 | 2017-06-06 | 伊格尔工业股份有限公司 | Check valve |
| CN105422881B (en) * | 2015-09-25 | 2018-04-20 | 上海发电设备成套设计研究院 | A kind of labyrinth type discharge valve flap |
| CN106246961A (en) * | 2016-10-10 | 2016-12-21 | 苏州工业园区咖乐美电器有限公司 | A kind of unidirectional accumulator valve |
| CN112066048B (en) * | 2020-09-16 | 2022-09-16 | 山东威玛装备科技股份有限公司 | Slow-closing check valve |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201582452U (en) * | 2010-01-27 | 2010-09-15 | 浙江超达阀门股份有限公司 | Constant pressure check valve |
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2010
- 2010-01-27 CN CN201010103885XA patent/CN101718361B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201582452U (en) * | 2010-01-27 | 2010-09-15 | 浙江超达阀门股份有限公司 | Constant pressure check valve |
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| Publication number | Publication date |
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| CN101718361A (en) | 2010-06-02 |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHAODA VALVE GROUP CO., LTD. Free format text: FORMER NAME: ZHEJIANG CHAODA VALVE CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: Jiangbei Avenue 325000 Zhejiang Oubei town of Yongjia County Patentee after: Chaoda Valve Group Co., Ltd. Address before: Jiangbei Avenue 325000 Zhejiang Oubei town of Yongjia County Patentee before: Zhejiang Chaoda Valve Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170710 Address after: 323000 Nanming road Zhejiang city Lishui province Shuige Industrial Zone No. 772 Patentee after: Lishui Chaoda Valve Group Co. Ltd. Address before: Jiangbei Avenue 325000 Zhejiang Oubei town of Yongjia County Patentee before: Chaoda Valve Group Co., Ltd. |