CN111927987B - Low-resistance special-shaped sealing check valve and using method - Google Patents
Low-resistance special-shaped sealing check valve and using method Download PDFInfo
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- CN111927987B CN111927987B CN202010971655.9A CN202010971655A CN111927987B CN 111927987 B CN111927987 B CN 111927987B CN 202010971655 A CN202010971655 A CN 202010971655A CN 111927987 B CN111927987 B CN 111927987B
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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
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/04—Check valves with guided rigid valve members shaped as balls
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/18—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float
- F16K31/30—Actuating devices; Operating means; Releasing devices actuated by fluid actuated by a float actuating a gate valve or sliding valve
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention discloses a low-resistance special-shaped sealing check valve and a using method thereof, and the low-resistance special-shaped sealing check valve comprises a valve body, wherein a liquid inlet channel and a liquid outlet channel are arranged on the valve body, a valve seat is arranged at the joint of the liquid inlet channel and the liquid outlet channel, a stroke cavity is formed in the valve seat, the stroke cavity extends upwards along the direction of the liquid inlet channel, the liquid outlet channel is connected to the middle part of the stroke cavity, a valve cover is arranged at the upper part of the stroke cavity, a valve core cylinder is arranged in the stroke cavity, a valve cavity is arranged in the valve core cylinder, a special-shaped valve core is arranged in the valve cavity, a liquid inlet is arranged at the lower end of the valve core cylinder, and a liquid outlet is also arranged on the side wall of the valve core cylinder; the special-shaped valve core is provided with an inclined plane, when the special-shaped valve core slides to the upper end of the valve cavity, the valve cavity is communicated with the liquid outlet channel, the inclined plane faces the liquid inlet and the liquid outlet, and when the special-shaped valve core slides to the lower end of the valve cavity, the valve cavity and the liquid outlet channel are closed. The scheme adopts the special-ball valve core with the inclined plane, thereby reducing the fluid flow resistance and reducing the pressure loss in the infusion pipeline.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a low-resistance special-shaped sealing check valve and a using method thereof.
Background
In the current market, the main application structures of check valves are lift check valves, swing check valves, butterfly check valves. Most check valves usually need manual operation to achieve the purpose of preventing liquid from flowing backwards, or a fixed part is arranged in the valve body after the check valve is opened, so that certain liquid flowing resistance is caused.
The lifting check valve is a spherical sealing check valve, the spherical sealing check valve comprises a valve body, a liquid inlet channel and a liquid outlet channel are arranged on the valve body, a valve seat is arranged at the joint of the liquid inlet channel and the liquid outlet channel, and a valve ball is arranged in the valve seat. In the existing check valve, (1) the valve core adopts a valve ball, and the resistance of liquid is large; (2) when the liquid pressure in the liquid inlet channel is smaller than that in the liquid outlet channel, but the liquid pressure in the liquid inlet channel is still enough to jack up the ball valve, the problem of counter flow is caused.
Disclosure of Invention
The invention provides a low-resistance special-shaped sealing check valve and a using method thereof, which aim to solve the problem that the existing valve ball has large resistance to liquid flow.
In order to achieve the purpose, the invention adopts the following technical scheme:
a low-resistance special-shaped sealing check valve comprises a valve body, wherein a liquid inlet channel and a liquid outlet channel are arranged on the valve body, a valve seat is arranged at the joint of the liquid inlet channel and the liquid outlet channel, a stroke cavity is formed in the valve seat, the stroke cavity extends upwards along the direction of the liquid inlet channel, the liquid outlet channel is connected to the middle part of the stroke cavity, a valve cover is installed at the upper part of the stroke cavity, a valve core cylinder is arranged in the stroke cavity, a valve cavity is arranged in the valve core cylinder, a special-shaped valve core is arranged in the valve cavity, a liquid inlet is arranged at the lower end of the valve core cylinder, and a liquid outlet is also arranged on the side wall of the valve core cylinder; the special-shaped valve core is provided with an inclined plane, when the special-shaped valve core slides to the upper end of the valve cavity, the valve cavity is communicated with the liquid outlet channel, the inclined plane faces the liquid inlet and the liquid outlet, and when the special-shaped valve core slides to the lower end of the valve cavity, the valve cavity and the liquid outlet channel are closed.
Optionally, the inclined surface is a smooth concave surface.
Optionally, the valve core cylinder is a float bowl, the float bowl can slide along the stroke cavity, the lower part of the float bowl is in sealed connection with the inner wall of the valve seat, and an adjusting cavity communicated with the liquid outlet channel is formed between the upper part of the float bowl and the inner wall of the valve seat; when the buoy and the special-shaped valve core slide to the upper end of the stroke cavity, the liquid outlet is communicated with the liquid outlet channel, and when the buoy and the special-shaped valve core slide to the lower end of the stroke cavity, the liquid outlet and the liquid outlet channel are closed in a staggered mode.
Optionally, the upper end of the float is provided with an installation opening, and a cylinder cover is arranged at the installation opening.
Optionally, an exhaust port is arranged in the middle of the cylinder cover.
Optionally, a stop ring is further installed in the stroke cavity, a positioning key is arranged on the stop ring, and a sliding groove matched with the positioning key is formed in the outer side wall of the float bowl.
Optionally, the liquid-discharging device further comprises a liquid-discharging channel, and the liquid-discharging channel is communicated with the adjusting cavity and the liquid-discharging channel.
Optionally, the valve cover is in threaded connection with the valve seat, and a sealing ring is arranged between the valve cover and the valve body.
The use method of the low-resistance special-shaped sealing check valve comprises the following steps:
(1) when liquid enters the liquid inlet channel in the valve body, the special-shaped valve core moves upwards in an inclined mode under the action of the pressure of the liquid;
(2) when the special-shaped valve core slides to the upper end of the valve core, the upper edge of the inclined plane is positioned at the upper end of the liquid outlet, and the lower edge of the inclined plane is positioned at the left side of the valve cavity;
(3) the liquid flows to the liquid outlet channel under the action of the inclined plane.
The use method of the low-resistance special-shaped sealing check valve specifically comprises the following steps:
(1) when liquid enters the liquid inlet channel in the valve body, the buoy moves towards the upper right under the action of the pressure of the liquid;
(2) when the float bowl slides to the upper end of the stroke cavity under the action of liquid pressure, the liquid pressure is continuously enhanced, and when the liquid pressure is greater than the self weight of the special-shaped valve core, the special-shaped valve core slowly rises to the uppermost end, and a passage is formed in the channel in the valve body, so that the liquid inlet channel, the valve cavity and the liquid outlet channel are communicated; making the whole check valve form a passage state;
(3) when the liquid pressure in the liquid inlet channel is reduced and the liquid pressure in the valve cavity is reduced, when the liquid pressure in the valve cavity is smaller than the liquid pressure in the liquid outlet channel, the liquid in the liquid channel flows back, and at the moment, the liquid in the liquid outlet channel enters the regulating cavity; because the liquid pressure of the adjusting cavity outside the floating cylinder is larger than the liquid pressure at the lower end of the floating cylinder, the floating cylinder moves downwards under the action of the liquid pressure, so that the liquid outlet of the floating cylinder is staggered with the liquid outlet channel, and the liquid entering the liquid outlet channel is reduced; if the liquid inlet channel continuously has liquid inlet, the liquid pressure of the liquid inlet channel is increased, so that the liquid in the liquid outlet channel is prevented from flowing back; if the liquid inlet channel does not feed liquid, the liquid outlet and the liquid outlet channel are closed; meanwhile, when the pressure of the liquid is smaller than the self weight of the special-shaped valve core, the special-shaped valve core is lowered to the lowest end.
The invention has the beneficial effects that:
the scheme adopts the special-ball valve core with the inclined plane, thereby reducing the fluid flow resistance and reducing the pressure loss in the infusion pipeline.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a (closed) schematic view of the check valve of the present invention;
FIG. 2 is a schematic view of the check valve (passage) of the present invention;
FIG. 3 is a schematic structural view of the check valve float of the present invention;
FIG. 4 is an AA-oriented view of FIG. 3;
FIG. 5 is a left side view of FIG. 3;
FIG. 6 is a schematic view of the check valve retainer ring of the present invention;
FIG. 7 is a schematic view of the check valve (ball, closed) of the present invention;
fig. 8 is a schematic view of the inventive check valve (ball, passage).
Description of reference numerals:
1: a valve body; 2: a float bowl; 3: a baffle ring; 4: a positioning key; 5: a seal ring; 6: a valve cover; 7: a cylinder cover; 8: a special-shaped valve core; 9: a liquid outlet; 10: an exhaust port; 11: an inner step; 12: a bevel; 13: a liquid inlet; 14: an upper edge; 15: a lower edge;
t1: a liquid inlet channel; t2: a valve cavity; t3: a stroke chamber; t4: a liquid outlet channel; 101: an adjustment chamber; 102: a liquid discharge channel.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
As shown in fig. 1-6, the low resistance special-shaped sealing check valve comprises a valve body 1, wherein a liquid inlet channel T1 and a liquid outlet channel T4 are arranged on the valve body 1, and a valve seat is arranged at the joint of the liquid inlet channel T1 and the liquid outlet channel T4.
A stroke chamber T3 is formed in the valve seat (fig. 4 shows that the stroke chamber T3 is smaller, and a larger cavity may be provided, or the entire float 2 may be surrounded, so as to facilitate the pressing down of the float), and the stroke chamber T3 extends obliquely upward in the direction of the inlet passage T1, and the outlet passage T4 is connected to the middle of the stroke chamber T3. The valve cover 6 is arranged on the upper part of the valve seat, namely the upper part of the stroke cavity T3. The valve cover 6 is in threaded connection with the valve seat, and a sealing ring 5 is arranged between the valve cover 6 and the valve body 1.
A valve core cylinder is arranged in the stroke cavity T3, the valve core cylinder is a buoy 2, a valve cavity T2 is arranged in the buoy 2, a special-shaped valve core 8 is arranged in the valve cavity T2, and the buoy 2 can slide along the stroke cavity T3. The special-shaped valve core 8 is provided with a bevel 12, and the bevel 12 can be a smooth concave surface to reduce the liquid flow resistance. The ramp 12 is directed obliquely downwards. When the special-shaped valve core 8 slides to the upper end of the valve cavity T2, the valve cavity T2 is communicated with the liquid outlet channel T4, the inclined surface 12 faces the liquid inlet 13 and the liquid outlet 9, and when the special-shaped valve core 8 slides to the lower end of the valve cavity T2, the valve cavity T2 and the liquid outlet channel T4 are closed. The lower valve body 1 of the stroke cavity T3 is provided with an inner step 11 for blocking the buoy 2. The lower part of the float 2 extends outwards to be connected with the inner wall of the valve seat in a sealing way, and a regulating cavity 101 communicated with the liquid outlet channel is arranged between the upper part of the float 2 and the inner wall of the valve seat. The lower extreme of flotation pontoon 2 is equipped with inlet 13, still is equipped with liquid outlet 9 on the lateral wall of flotation pontoon 2. When the float bowl 2 and the special-shaped valve core 8 slide to the upper end of the stroke cavity T3, the liquid outlet 9 is communicated with the liquid outlet channel T4, and when the float bowl 2 and the special-shaped valve core 8 slide to the lower end of the stroke cavity T3, the liquid outlet 9 and the liquid outlet channel T4 are closed in a staggered mode.
The upper end of the float 2 is provided with a mounting opening, and the mounting opening is provided with a cylinder cover 7 for mounting a special-shaped valve core 8. The middle part of the cylinder cover 7 is provided with an air outlet 10 which is used for discharging air at the upper part of the valve cavity T2 when the special-shaped valve core 8 rises.
A baffle ring 3 is further arranged in the stroke cavity T3, a positioning key 4 is arranged on the baffle ring 3, and a sliding groove matched with the positioning key 4 is arranged on the outer side wall of the float 2. In this way, the float 2 is prevented from rotating, and the liquid outlet 9 is aligned with the liquid outlet passage T4.
As shown in fig. 7 and 8, the special-shaped valve core 8 can be replaced by a valve ball.
The liquid discharge channel 102 is also included, and the liquid discharge channel 102 is communicated with the adjusting cavity 101 and the liquid outlet channel T4. When the pontoon 2 slides to the uppermost end, the protrusion on the lower part of the pontoon 2 seals the liquid discharge channel 102, and when the pontoon 2 slides downwards, the protrusion moves downwards, and the liquid discharge channel 102 is communicated with the adjusting cavity 101.
The installation mode is as follows:
after the special-shaped valve core 8 is placed in the inner cavity of the floating barrel 2, the barrel cover 7 is tightly connected with the floating barrel 2 to play a role in sealing.
The float 2 is arranged in the cavity of the valve body 1;
the positioning key 4 is placed in a key groove in the baffle ring 3;
the baffle ring 3 is placed in the valve body 1, so that the exposed part of the positioning key 4 is placed in the key groove on the wall of the float 2, and the baffle ring 3 is coupled with a positioning step in the valve body 1 for positioning. The key grooves are matched for use, so that the circular opening on the baffle ring 3 is just butted with the liquid outlet 9 of the valve body 1, and the liquid outlet 9 of the float 2 and the liquid outlet 9 of the valve body 1 form a channel;
the sealing ring 5 is placed in a ring groove on the valve cover 6;
the valve cover 6 is tightly connected with the valve body 1.
The scheme utilizes the buoyancy of liquid and the gravity and hydraulic pressure changes of the sealing buoy and the special-shaped valve core to enable the check valve to form a passage and a sealing state so as to achieve one-way flow of the liquid in the passage. The valve body is provided with a stroke movable area which is convenient for the movement of the buoy by mainly utilizing the opening and closing of the spherical seal and the movement stroke channel of the buoy; be equipped with the cavity in the flotation pontoon, make things convenient for the removal of abnormal shape case, the combination uses and reaches sealed effect to the pressure variation of liquid in the adaptation valve body reaches the effect of preventing against current completely.
The working process is as follows:
(1) when liquid enters the liquid inlet channel in the valve body, the special-shaped valve core moves upwards in an inclined mode under the action of the pressure of the liquid;
(2) when the special-shaped valve core slides to the upper end of the valve core, the upper edge of the inclined plane is positioned at the upper end of the liquid outlet, and the lower edge of the inclined plane is positioned at the left side of the valve cavity;
(3) the liquid flows to the liquid outlet channel under the action of the inclined plane.
Specific work flow (anti-reflux)
(1): when liquid enters the liquid inlet channel T1 in the valve body 1, the buoy 2 moves to the upper right side under the action of the pressure of the liquid and enters the stroke cavity T3, and the positioning key 4 plays a guiding role;
(2): when the buoy 2 is contacted with the baffle ring 3 under the action of liquid pressure, the buoy is still; the liquid pressure is continuously enhanced, when the liquid pressure is larger than the dead weight of the special-shaped valve core 8, the special-shaped valve core 8 slowly rises and enters the valve cavity T2, and the valve cover 6 is provided with a small hole, so that gas enters the stroke cavity T3 when the special-shaped valve core 8 rises; after the special-shaped valve core 8 completely rises to the top end under the action of liquid pressure, a passage is formed in the valve body 1, so that the liquid inlet passage T1, the valve cavity T2 and the liquid outlet passage T4 are communicated; making the whole check valve form a passage state;
when the buoy 2 rises, liquid in the adjusting cavity 101 enters the liquid outlet channel T4 through the liquid outlet channel 102;
(3): when the liquid pressure in the liquid inlet channel T1 is reduced, the liquid pressure in the valve cavity T2 is also reduced, when the liquid pressure in the valve cavity T2 is smaller than the liquid pressure in the liquid outlet channel T4, the liquid in the liquid outlet channel T4 flows back, at the moment, the liquid in the liquid outlet channel T4 enters the adjusting cavity 101, and under the action of the liquid pressure, the buoy 2 moves downwards; when the buoy 2 moves downwards to open the liquid discharge channel 102 in the valve body 1, the buoy 2 moves downwards at an accelerated speed under the action of liquid pressure and is static at the step 11 in the valve body 1;
because the liquid pressure in the valve cavity T2 becomes smaller, the liquid pressure overcomes the self gravity of the special-shaped valve core 8 to make the special-shaped valve core rise in the process of opening the passage; the pressure of the liquid in the existing valve cavity T2 is reduced, and the special-shaped valve core 8 moves downwards under the action of self gravity; when the float bowl 2 is static in the valve body 1, the special-shaped valve core 8 continues to descend to form a seal at the inner step 11 of the float bowl 2, so that the liquid in the liquid outlet channel T4 stops flowing into the valve cavity T2, the liquid in the liquid outlet channel T4 is prevented from flowing into the liquid inlet channel T1, and the whole check valve is in a closed state;
(4): when liquid discharging and stopping are carried out again, the pressure of the liquid inlet channel T1, the valve cavity T2 and the liquid outlet channel T4 in the valve body 1 is changed, and the steps (1) to (3) are repeated.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A low-resistance special-shaped sealing check valve comprises a valve body, wherein a liquid inlet channel and a liquid outlet channel are arranged on the valve body, a valve seat is arranged at the joint of the liquid inlet channel and the liquid outlet channel, a stroke cavity is formed in the valve seat, the stroke cavity extends upwards along the direction of the liquid inlet channel, the liquid outlet channel is connected to the middle part of the stroke cavity, and a valve cover is installed at the upper part of the stroke cavity; the special-shaped valve core is provided with an inclined plane, when the special-shaped valve core slides to the upper end of the valve cavity, the valve cavity is communicated with the liquid outlet channel, the inclined plane faces the liquid inlet and the liquid outlet, and when the special-shaped valve core slides to the lower end of the valve cavity, the valve cavity and the liquid outlet channel are closed;
the valve core cylinder is a buoy, the buoy can slide along the stroke cavity, the lower part of the buoy is in sealing connection with the inner wall of the valve seat, and an adjusting cavity communicated with the liquid outlet channel is formed between the upper part of the buoy and the inner wall of the valve seat; when the buoy and the special-shaped valve core slide to the upper end of the stroke cavity, the liquid outlet is communicated with the liquid outlet channel, and when the buoy and the special-shaped valve core slide to the lower end of the stroke cavity, the liquid outlet and the liquid outlet channel are closed in a staggered mode.
2. The low-drag contour seal check valve of claim 1 wherein said chamfer is a smooth concave inner surface.
3. The low drag profile seal check valve of claim 1 wherein said float bowl has a mounting opening at an upper end thereof, said mounting opening having a bowl cover.
4. The low-drag contour seal check valve of claim 3 wherein an exhaust port is provided in the middle of said barrel cover.
5. The low resistance profile seal check valve of claim 1 wherein a retaining ring is further mounted in the stroke cavity, the retaining ring is provided with a positioning key, and the outer sidewall of the float bowl is provided with a sliding groove matched with the positioning key.
6. The low-drag profile seal check valve of claim 1 further comprising a drain passage communicating the regulated chamber and the drain passage.
7. The low drag profile seal check valve of claim 1 wherein the valve cover is threadably connected to the valve seat and a sealing ring is disposed between the valve cover and the valve body.
8. The method of using the low-drag profile seal check valve of any of claims 1-7 comprising the steps of:
(1) when liquid enters the liquid inlet channel in the valve body, the special-shaped valve core moves upwards in an inclined mode under the action of the pressure of the liquid;
(2) when the special-shaped valve core slides to the upper end of the valve core, the upper edge of the inclined plane is positioned at the upper end of the liquid outlet, and the lower edge of the inclined plane is positioned at the left side of the valve cavity;
(3) the liquid flows to the liquid outlet channel under the action of the inclined plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010971655.9A CN111927987B (en) | 2020-09-16 | 2020-09-16 | Low-resistance special-shaped sealing check valve and using method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010971655.9A CN111927987B (en) | 2020-09-16 | 2020-09-16 | Low-resistance special-shaped sealing check valve and using method |
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| Publication Number | Publication Date |
|---|---|
| CN111927987A CN111927987A (en) | 2020-11-13 |
| CN111927987B true CN111927987B (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010971655.9A Active CN111927987B (en) | 2020-09-16 | 2020-09-16 | Low-resistance special-shaped sealing check valve and using method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4314583A (en) * | 1980-06-09 | 1982-02-09 | Peterson Harold A | Backwater valve |
| CN87211361U (en) * | 1987-11-04 | 1988-09-07 | 江伟平 | Check valve with floating ball |
| DE10239622C1 (en) * | 2002-08-29 | 2003-11-06 | Niklas-Simon Graul | Back-flow prevention valve, for drainage pipe, uses floating ball lifted for closing valve seat adjacent bottom end of drainage pipe |
| CN1590818A (en) * | 2003-08-28 | 2005-03-09 | 株式会社开滋 | Check ball valve and water draining controller using valve |
| CN202545902U (en) * | 2012-05-14 | 2012-11-21 | 生贵阀门有限公司 | Spherical sealing high-pressure check valve |
| CN109869510A (en) * | 2017-12-01 | 2019-06-11 | 中国石油化工股份有限公司华北油气分公司采油一厂 | Valve ball formula ball-and-seat |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6469406B2 (en) * | 2014-10-07 | 2019-02-13 | 株式会社イシザキ | Check valve and check valve set |
-
2020
- 2020-09-16 CN CN202010971655.9A patent/CN111927987B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4314583A (en) * | 1980-06-09 | 1982-02-09 | Peterson Harold A | Backwater valve |
| CN87211361U (en) * | 1987-11-04 | 1988-09-07 | 江伟平 | Check valve with floating ball |
| DE10239622C1 (en) * | 2002-08-29 | 2003-11-06 | Niklas-Simon Graul | Back-flow prevention valve, for drainage pipe, uses floating ball lifted for closing valve seat adjacent bottom end of drainage pipe |
| CN1590818A (en) * | 2003-08-28 | 2005-03-09 | 株式会社开滋 | Check ball valve and water draining controller using valve |
| CN202545902U (en) * | 2012-05-14 | 2012-11-21 | 生贵阀门有限公司 | Spherical sealing high-pressure check valve |
| CN109869510A (en) * | 2017-12-01 | 2019-06-11 | 中国石油化工股份有限公司华北油气分公司采油一厂 | Valve ball formula ball-and-seat |
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| CN111927987A (en) | 2020-11-13 |
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