CN111677880B - Pneumatic piston stop valve - Google Patents
Pneumatic piston stop valve Download PDFInfo
- Publication number
- CN111677880B CN111677880B CN202010671707.0A CN202010671707A CN111677880B CN 111677880 B CN111677880 B CN 111677880B CN 202010671707 A CN202010671707 A CN 202010671707A CN 111677880 B CN111677880 B CN 111677880B
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- CN
- China
- Prior art keywords
- piston
- valve
- sealing
- sealing ring
- upper piston
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 238000007789 sealing Methods 0.000 claims abstract description 78
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Driven Valves (AREA)
- Lift Valve (AREA)
Abstract
本发明涉及一种气动活塞式截止阀，包括阀体、阀芯，在阀体进出口通道之间的阀腔内设置水平阀座；其特征是：在阀腔上下两侧分别制有与阀座同心的上活塞缸和下活塞缸，阀芯采用上活塞和下活塞组成双活塞结构，上活塞与下活塞由连接杆相互固定连接，上活塞下端面与连接杆之间的环形面积大于下活塞上端面与连接杆之间的环形面积；上活塞缸上端的上盖上设有气压接头；在上活塞下部外圆面嵌装密封环，该密封环由导向环压紧安装在上活塞的环形台阶上，导向环外圆面与阀座通孔内壁动密封配合，密封环直径大于导向环直径，其下平面內制有与阀座出口侧密封面相互配合的环形密封面。具有体积小、制作成本低、密封性能可靠等优点。
The present invention relates to a pneumatic piston stop valve, comprising a valve body and a valve core, wherein a horizontal valve seat is arranged in a valve cavity between an inlet and outlet passage of the valve body; the valve cavity is characterized in that an upper piston cylinder and a lower piston cylinder concentric with the valve seat are respectively formed on the upper and lower sides of the valve cavity, the valve core adopts an upper piston and a lower piston to form a double piston structure, the upper piston and the lower piston are fixedly connected to each other by a connecting rod, the annular area between the lower end face of the upper piston and the connecting rod is larger than the annular area between the upper end face of the lower piston and the connecting rod; an air pressure joint is arranged on the upper cover at the upper end of the upper piston cylinder; a sealing ring is embedded in the outer cylindrical surface of the lower part of the upper piston, the sealing ring is pressed and installed on the annular step of the upper piston by a guide ring, the outer cylindrical surface of the guide ring is dynamically sealed with the inner wall of the valve seat through hole, the diameter of the sealing ring is larger than the diameter of the guide ring, and an annular sealing surface is formed in the lower plane thereof to cooperate with the sealing surface on the outlet side of the valve seat. The valve has the advantages of small size, low manufacturing cost, reliable sealing performance, etc.
Description
Technical Field
The invention belongs to the field of valves, and particularly relates to a piston type stop valve. The invention is suitable for the working conditions of toxic and harmful dangerous media.
Background
The structure of the pneumatic stop valve generally comprises a valve body, a valve seat, a valve core, a valve rod, a valve cover, a support and a pneumatic actuator, wherein the valve core is connected to the lower end of the valve rod, the upper end of the valve rod penetrates through the upper end face of the valve cover to be connected with a valve rod nut fixedly arranged on the support, the pneumatic actuator drives the valve rod nut to rotate, and the valve rod is driven to move up and down so as to realize the opening and closing operation of the valve core. The valve cover has the advantages that the upper end of the valve cover is provided with the support and the pneumatic actuator, the size is large, the cost is high, and the sealing filler between the valve rod and the valve cover is easy to leak due to abrasion of the valve rod, so that the sealing reliability is poor.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the pneumatic piston type stop valve which is small in size, low in cost and reliable in sealing performance.
The technical scheme includes that a horizontal valve seat is arranged in a valve cavity between an inlet channel and an outlet channel of the valve body, the horizontal valve seat is characterized in that an upper piston cylinder and a lower piston cylinder which are concentric with the valve seat are respectively arranged on the upper side and the lower side of the valve cavity, the valve core adopts an upper piston and a lower piston to form a double-piston structure, the outer circular surface of the upper piston is in movable sealing fit with the inner wall of the upper piston cylinder, the outer circular surface of the lower piston is in movable sealing fit with the inner wall of the lower piston cylinder, the center of the lower end surface of the upper piston is fixedly connected with the center of the upper end surface of the lower piston through a connecting rod, the annular area between the lower end surface of the upper piston and the connecting rod is larger than the annular area between the upper end surface of the lower piston and the connecting rod, an upper cover is arranged at the upper end of the upper piston cylinder, an air pressure joint is arranged at the center of the plane of the upper cover and is communicated with a piston cavity of the lower end surface of the upper cover, a sealing ring is embedded on the outer circular surface of the lower piston, the sealing ring is tightly pressed and arranged on an annular step of the upper piston through hole of the upper piston through, the sealing ring is in movable sealing fit with the inner wall of the valve seat, the sealing ring diameter is larger than the diameter of the sealing ring, the sealing ring is formed in the inner plane of the sealing ring and the sealing ring is mutually matched with the sealing surface on the side of the outlet side of the sealing surface of the upper piston.
Preferably, the outer circumferential surface of the upper piston is provided with a first sealing ring and a second sealing ring which are in dynamic sealing fit with the upper piston cylinder, and the outer circumferential surface of the lower piston is provided with a third sealing ring and a fourth sealing ring which are in dynamic sealing fit with the lower piston cylinder.
Preferably, a spring is arranged between the lower end surface of the lower piston and the bottom surface of the lower piston cylinder.
Preferably, a plurality of inverted U-shaped windows are uniformly formed on the circumference of the lower ring surface of the guide ring.
Compared with the prior art, the invention has the advantages that the valve core is directly driven to be closed by adopting air pressure and automatically pushed to be opened by medium pressure, so that the product has small volume, low manufacturing cost and reliable sealing performance.
Drawings
Fig. 1 is a schematic view of the structure of the present invention in a closed state.
Fig. 2 is a schematic view of the structure of the present invention in the fully opened state.
The valve comprises a valve body 1, a lower piston 2, a connecting rod 3, a guide ring 4, a sealing ring 5, a first sealing ring 6, an upper piston 7, a second sealing ring 8, an upper cover 9, a pneumatic joint 10, a third sealing ring 11, a third sealing ring 12, a fourth sealing ring 12, a spring 13 and a lower piston cylinder 14.
Detailed Description
The pneumatic piston type stop valve shown in fig. 1 and 2 comprises a valve body 1 and a valve core, wherein a horizontal valve seat is arranged in a valve cavity between an inlet channel and an outlet channel of the valve body 1; the valve is characterized in that an upper piston cylinder and a lower piston cylinder 14 which are concentric with a valve seat are respectively arranged on the upper side and the lower side of a valve cavity, a valve core adopts an upper piston 7 and a lower piston 2 to form a double-piston structure, the outer circular surface of the upper piston 7 is in dynamic sealing fit with the inner wall of the upper piston cylinder, the outer circular surface of the lower piston 2 is in dynamic sealing fit with the inner wall of the lower piston cylinder 14, the center of the lower end surface of the upper piston 7 is fixedly connected with the center of the upper end surface of the lower piston 2 through a connecting rod 3, the upper piston 7, the upper piston cylinder, the lower piston 2 and the lower piston cylinder 14 form a double-guide and double-positioning structure, the matching concentricity between the valve core and the valve seat is ensured, the sealing performance is improved, the annular area between the lower end surface of the upper piston 7 and the connecting rod 3 is larger than the annular area between the upper end surface of the lower piston 2 and the connecting rod 3, and the upward thrust generated by a medium in an inlet channel of the valve body 1 is larger than the downward thrust generated by the upper piston 2, and the medium is pushed to move upwards when no external force is generated; the upper end of the upper piston cylinder is provided with an upper cover 9, the center of the plane of the upper cover 9 is provided with an air pressure joint 10, the air pressure joint 10 is communicated with a piston cavity at the lower end face of the upper cover 9, when air pressure is injected into the piston cavity, the valve core is pushed to move downwards to be matched with the valve seat in a sealing way, the lower outer circular surface of the upper piston 7 is embedded with a sealing ring 5, the sealing ring 5 is tightly pressed and installed on an annular step of the upper piston 7 by a guide ring 4, the outer circular surface of the guide ring 4 is matched with the inner wall of a valve seat through hole in a dynamic sealing way to form a first sealing pair, the diameter of the sealing ring 5 is larger than that of the guide ring 4, an annular sealing surface matched with the sealing surface at the outlet side of the valve seat is arranged in the lower plane of the sealing ring 5 at the outer side of the guide ring 4, the second sealing pair is formed, secondary sealing is realized on the medium leaked from the first sealing pair, the second sealing pair is easy to completely block the medium leaked from the first sealing pair and realize zero leakage, the annular sealing surface of the sealing ring 5 is positioned on the upper side of the lower end surface of the upper piston 7, when the valve core is opened, the lower end surface of the upper piston 7 blocks flushing of the medium on the sealing ring 5, sealing performance is improved, an annular pressure cavity with a downward opening is formed between the inner wall of the guide ring 4 and the lower end surface of the upper piston 7, the opening height of the valve core is increased, and the valve core is ensured to be fully opened in place. The bottom of the lower piston cylinder 14 is provided with breathing holes.
The outer circular surface of the upper piston 7 is provided with a first sealing ring 6 and a second sealing ring 8 which are in dynamic sealing fit with the upper piston cylinder, the first sealing ring 6, the second sealing ring 8 and the upper piston cylinder form a double sealing pair in a valve element full-open state to realize zero leakage of a middle cavity, and the outer circular surface of the lower piston 2 is provided with a third sealing ring 11 and a fourth sealing ring 12 which are in dynamic sealing fit with the lower piston cylinder 14 to realize zero leakage of a lower cavity of the valve body 1.
A spring 13 is arranged between the lower end surface of the lower piston 2 and the bottom surface of the lower piston cylinder 14, and the spring 13 and the medium pressure of the inlet channel of the valve body 1 push the valve core to move upwards together so as to reduce the valve opening pressure.
The circumference direction of the lower ring surface of the guide ring 4 is uniformly provided with a plurality of inverted U-shaped windows, when the flow rate is low, a medium passes through the inverted U-shaped windows and the valve seat, the outer circular surface of the lower part of the guide ring 4 is in guide fit with the inner wall of the through hole of the valve seat, and the stability of the valve core in the process of micro opening is improved.
Claims (4)
1. A pneumatic piston stop valve comprises a valve body (1) and a valve core, wherein a horizontal valve seat is arranged in a valve cavity between an inlet channel and an outlet channel of the valve body (1), an upper piston cylinder and a lower piston cylinder (14) which are concentric with the valve seat are respectively arranged on the upper side and the lower side of the valve cavity, the valve core adopts an upper piston (7) and a lower piston (2) to form a double-piston structure, the outer circular surface of the upper piston (7) is in dynamic seal fit with the inner wall of the upper piston cylinder, the outer circular surface of the lower piston (2) is in dynamic seal fit with the inner wall of the lower piston cylinder (14), the center of the lower end surface of the upper piston (7) is fixedly connected with the center of the upper end surface of the lower piston (2) through a connecting rod (3), the annular area between the lower end surface of the upper piston (7) and the connecting rod (3) is larger than the annular area between the upper end surface of the lower piston (2) and the connecting rod (3), an upper cover (9) is arranged at the upper end of the upper piston cylinder, an air pressure joint (10) is arranged at the center of the plane of the upper cover (9), the air pressure joint (10) is communicated with a piston cavity of the lower end surface of the upper cover (9), an outer circular surface (5) is embedded on the lower outer circular surface of the upper piston (7), the upper sealing ring (4) is in dynamic seal fit with the diameter of the upper sealing ring (4) through a guide ring (4), an annular sealing surface matched with the valve seat outlet side sealing surface is formed in the lower plane of the sealing ring (5) at the outer side of the guide ring (4), the annular sealing surface of the sealing ring (5) is positioned at the upper side of the lower end surface of the upper piston (7), and an annular pressure cavity with a downward opening is formed between the inner wall of the guide ring (4) and the lower end surface of the upper piston (7).
2. A pneumatic piston stop valve according to claim 1 is characterized in that the outer circular surface of the upper piston 7 is provided with a first sealing ring 6 and a second sealing ring 8 which are in dynamic sealing fit with the upper piston cylinder, and the outer circular surface of the lower piston 2 is provided with a third sealing ring 11 and a fourth sealing ring 12 which are in dynamic sealing fit with the lower piston cylinder 14.
3. Pneumatic piston shut-off valve according to claim 1 or 2, characterized in that a spring (13) is mounted between the lower end surface of the lower piston (2) and the bottom surface of the lower piston cylinder (14).
4. The pneumatic piston type stop valve according to claim 1 or 2, wherein a plurality of inverted U-shaped windows are uniformly formed in the circumferential direction of the lower ring surface of the guide ring (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671707.0A CN111677880B (en) | 2020-07-14 | 2020-07-14 | Pneumatic piston stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671707.0A CN111677880B (en) | 2020-07-14 | 2020-07-14 | Pneumatic piston stop valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111677880A CN111677880A (en) | 2020-09-18 |
| CN111677880B true CN111677880B (en) | 2025-02-11 |
Family
ID=72457477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010671707.0A Active CN111677880B (en) | 2020-07-14 | 2020-07-14 | Pneumatic piston stop valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111677880B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033892B (en) * | 2021-12-02 | 2024-06-21 | 大连大高阀门股份有限公司 | Main steam release isolation valve |
| CN115875325B (en) * | 2022-10-09 | 2025-06-27 | 无锡市亚迪流体控制技术有限公司 | A pneumatic amplifier |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212509545U (en) * | 2020-07-14 | 2021-02-09 | 浙江人一阀门制造有限公司 | Pneumatic Piston Globe Valve |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3572382A (en) * | 1969-01-31 | 1971-03-23 | Fred J Luthe | Single-ported double-seated valve mechanism |
| CN1219166C (en) * | 2000-01-27 | 2005-09-14 | 张磊 | Multifunctional piston valve |
| CN204004722U (en) * | 2014-08-19 | 2014-12-10 | 重庆川武仪表有限公司 | Balance cage type single seat regulating valve |
| CN107763266A (en) * | 2016-08-18 | 2018-03-06 | 阿司米阀门有限公司 | A kind of low temperature resistant pilot operated safety valve of high temperature resistant |
-
2020
- 2020-07-14 CN CN202010671707.0A patent/CN111677880B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN212509545U (en) * | 2020-07-14 | 2021-02-09 | 浙江人一阀门制造有限公司 | Pneumatic Piston Globe Valve |
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| Publication number | Publication date |
|---|---|
| CN111677880A (en) | 2020-09-18 |
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