CN111677880A - Pneumatic piston type stop valve - Google Patents
Pneumatic piston type stop valve Download PDFInfo
- Publication number
- CN111677880A CN111677880A CN202010671707.0A CN202010671707A CN111677880A CN 111677880 A CN111677880 A CN 111677880A CN 202010671707 A CN202010671707 A CN 202010671707A CN 111677880 A CN111677880 A CN 111677880A
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- China
- Prior art keywords
- piston
- valve
- sealing
- sealing ring
- ring
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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
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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
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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
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The invention relates to a pneumatic piston type stop valve, which comprises a valve body 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; the method 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 a double-piston structure consisting of an upper piston and a lower piston, the upper piston and the lower piston are fixedly connected with each other through a connecting rod, and the annular area between the lower end surface of the upper piston and the connecting rod is larger than that between the upper end surface of the lower piston and the connecting rod; an upper cover at the upper end of the upper piston cylinder is provided with an air pressure joint; the outer circular surface of the lower part of the upper piston is embedded with a sealing ring, the sealing ring is tightly pressed and installed on the annular step of the upper piston by a guide ring, the outer circular surface of the guide ring is in dynamic sealing fit with the inner wall of the through hole of the valve seat, the diameter of the sealing ring is larger than that of the guide ring, and an annular sealing surface which is matched with the sealing surface on the outlet side of the valve seat is formed in the lower plane of the sealing. Has the advantages of small volume, low manufacturing cost, reliable sealing performance and the like.
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 hazardous media such as poison and harm.
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 installed on the support, the pneumatic actuator drives the valve rod nut to rotate, the valve rod is driven to move up and down, and the opening and closing operation of the. One of the disadvantages is: the upper end of the valve cover is provided with the bracket and the pneumatic actuator, so the size is large and the cost is high; the second defect is that: the sealing filler between the valve rod and the valve cover is easy to be worn by the valve rod to cause leakage, and the sealing reliability is poor.
Disclosure of Invention
Aiming at the defects 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 for realizing the invention comprises a valve body 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; the method 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 a double-piston structure consisting of an upper piston and a lower piston, the outer circular surface of the upper piston is in dynamic sealing fit with the inner wall of the upper piston cylinder, the outer circular surface of the lower piston is in dynamic sealing fit with the inner wall of the lower piston cylinder, the center of the lower end surface of the upper piston and the center of the upper end surface of the lower piston are fixedly connected with each other through a connecting rod, and the annular area between the lower end surface of the upper piston and the connecting rod is larger; the upper end of the upper piston cylinder is provided with an upper cover, the center of the plane of the upper cover is provided with an air pressure joint, and the air pressure joint is communicated with a piston cavity on the lower end surface of the upper cover; the outer circular surface of the lower part of the upper piston is embedded with a sealing ring, the sealing ring is tightly pressed and installed on an annular step of the upper piston by a guide ring, the outer circular surface of the guide ring is in dynamic sealing fit with the inner wall of a through hole of a valve seat, the diameter of the sealing ring is larger than that of the guide ring, an annular sealing surface which is matched with a sealing surface on the outlet side of the valve seat is arranged in the lower plane of the sealing ring on the outer side of the guide ring, the annular sealing surface is positioned on the upper side of the lower end face of the upper piston, and an annular.
Preferably, the outer circular 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 circular 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, the lower ring surface of the guide ring is uniformly provided with a plurality of n-shaped windows in the circumferential direction.
Compared with the prior art, the invention has the beneficial effects that: the valve core is directly driven to close by air pressure and is automatically pushed to open by medium pressure, and the valve core is small in size, low in manufacturing cost and reliable in sealing performance.
Drawings
Fig. 1 is a schematic structural view of the closed state of the present invention.
Fig. 2 is a schematic structural view of the fully open state of the present invention.
1 valve body, 2 lower pistons, 3 connecting rods, 4 guide rings, 5 sealing rings, 6 first sealing rings, 7 upper pistons, 8 second sealing rings, 9 upper covers, 10 pneumatic joints, 11 third sealing rings, 12 fourth sealing rings, 13 springs and 14 lower piston cylinders.
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 method is characterized in that: an upper piston cylinder and a lower piston cylinder 14 which are concentric with a valve seat are respectively arranged at the upper side and the lower side of the valve cavity, the valve core adopts a double-piston structure consisting of an upper piston 7 and a lower piston 2, 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-guiding 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, the upward thrust generated, the medium pushes the valve core to move upwards; 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 on the lower end surface of the upper cover 9, and when air pressure is injected into the piston cavity, the valve core is pushed to move downwards to be in sealing fit with the valve seat; the outer circular surface of the lower part of an 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 in movable sealing fit with the inner wall of a through hole of a valve seat 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 which is matched with a sealing surface at the outlet side of the valve seat is formed in the lower plane of the sealing ring 5 at the outer side of the guide ring 4 to form a second sealing pair, secondary sealing is realized on a medium leaked from the first sealing pair, the second sealing pair is easy to completely block the medium leaked from the first sealing pair due to the fact that the medium leaked from the first sealing pair is a trace ultralow-pressure medium, zero leakage is realized, 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 when a valve core is opened, the washing of the sealing, 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 a breathing hole.
The excircle surface of the upper piston 7 is provided with a first sealing ring 6 and a second sealing ring 8 which are matched with the upper piston cylinder in a dynamic sealing way, and the first sealing ring 6, the second sealing ring 8 and the upper piston cylinder form a double sealing pair under the state that the valve core is fully opened, so that zero leakage of the middle cavity is realized; 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, so that zero leakage of the lower cavity of the valve body 1 is realized.
A spring 13 is arranged between the lower end surface of the lower piston 2 and the bottom surface of a lower piston cylinder 14, and the spring 13 and the medium pressure of an inlet channel of the valve body 1 jointly push the valve core to move upwards so as to reduce the opening pressure of the valve.
The circumferential direction of the lower ring surface of the guide ring 4 is uniformly provided with a plurality of n-shaped windows, when the flow is low, a medium passes through the n-shaped windows and the valve seat, and the outer ring 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, so that the stability of the valve core during small opening is improved.
Claims (4)
1. A pneumatic piston type 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); the method is characterized in that: 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 a double-piston structure consisting of an upper piston (7) and a lower piston (2), 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), and 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; 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), and the air pressure joint (10) is communicated with a piston cavity on the lower end face of the upper cover (9); the outer circular surface of the lower portion of an 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) through a guide ring (4), the outer circular surface of the guide ring (4) is in dynamic sealing fit with the inner wall of a through hole of a valve seat, the diameter of the sealing ring (5) is larger than that of the guide ring (4), an annular sealing surface which is matched with a sealing surface on the outlet side of the valve seat is formed in the lower plane of the sealing ring (5) on the outer side of the guide ring (4), the annular sealing surface of the sealing ring (5) is located on the upper side of the lower end face of the upper piston (7), and an annular pressure cavity with a downward opening.
2. A pneumatic piston shut off valve as defined in claim 1 wherein: 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. A pneumatic piston shut-off valve according to claim 1 or 2, characterised in that: 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).
4. A pneumatic piston shut-off valve according to claim 1 or 2, characterised in that: the lower ring surface of the guide ring (4) is uniformly provided with a plurality of n-shaped windows in the circumferential direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671707.0A CN111677880A (en) | 2020-07-14 | 2020-07-14 | Pneumatic piston type stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010671707.0A CN111677880A (en) | 2020-07-14 | 2020-07-14 | Pneumatic piston type stop valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111677880A true CN111677880A (en) | 2020-09-18 |
Family
ID=72457477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010671707.0A Pending CN111677880A (en) | 2020-07-14 | 2020-07-14 | Pneumatic piston type stop valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111677880A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033892A (en) * | 2021-12-02 | 2022-02-11 | 大连大高阀门股份有限公司 | Main steam release isolating valve |
-
2020
- 2020-07-14 CN CN202010671707.0A patent/CN111677880A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114033892A (en) * | 2021-12-02 | 2022-02-11 | 大连大高阀门股份有限公司 | Main steam release isolating valve |
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