CN107255171B - Maintenance-free full-sealed cut-off cover plate valve - Google Patents
Maintenance-free full-sealed cut-off cover plate valve Download PDFInfo
- Publication number
- CN107255171B CN107255171B CN201710693932.2A CN201710693932A CN107255171B CN 107255171 B CN107255171 B CN 107255171B CN 201710693932 A CN201710693932 A CN 201710693932A CN 107255171 B CN107255171 B CN 107255171B
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- valve
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- cover plate
- gap
- air inlet
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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
- F16K1/16—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 with pivoted closure-members
- F16K1/18—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 with pivoted closure-members with pivoted discs or flaps
- F16K1/22—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 with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
- F16K1/226—Shaping or arrangements of the sealing
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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
- 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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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Sliding Valves (AREA)
Abstract
The invention discloses a maintenance-free full-sealed cut-off cover plate valve, and relates to the technical field of valves. According to the cut-off cover plate valve, the outer side of the air inlet chamber is provided with the leakage-proof chamber connected with the first gap, and the exhaust hole of the valve body is provided with the inner leakage-proof chamber connected with the second gap, so that air seal between the air inlet chamber and the outside air and air seal between the air inlet chamber and the exhaust chamber are realized, and the leakage and the inner leakage of gas are avoided; the valve rod is not contacted with the side wall of the air inlet chamber, and the valve cover plate is not contacted with the partition plate, so that the valve rod and the valve cover plate are prevented from being worn, and maintenance-free is realized; meanwhile, the plate wall of the rectangular ventilation pipeline on site is used as the valve body, so that the cost can be effectively reduced.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a maintenance-free full-sealed cut-off cover plate valve.
Background
With the development of economy, the level of industrial automation control is continuously increasing, and thus, the demands on the reliability and economy of the regulating valve in process control are also continuously increasing. This also places higher demands on the valve body structure.
The valve used at present is usually sealed in a soft sealing or hard sealing mode, but the contact between solid components exists no matter in the soft sealing mode or the hard sealing mode, so that the valve plate and the valve rod are continuously contacted with sealing elements in the moving process, the valve plate, the valve rod and the sealing elements are worn, the service life of the valve plate is reduced, the leakage risk is increased, and the valve needs to be frequently maintained and replaced; in addition, the valve has a complex structure and a large weight, so that the production cost is relatively high.
Disclosure of Invention
The invention aims to provide a maintenance-free full-sealed cut-off cover plate valve, so as to solve the problems in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a maintenance-free fully sealed shut-off flap valve comprising: the valve rod is arranged on the rectangular ventilation pipeline, the rectangular ventilation pipeline is divided into an air inlet chamber and an air outlet chamber through a partition plate, one end of the valve rod is positioned at the outer side of the air inlet chamber and connected with a driving device, a first gap is formed between the valve rod and the side wall of the air inlet chamber, the other end of the valve rod penetrates through the partition plate and is positioned in the air outlet chamber, an air outlet hole is formed in the partition plate, the valve cover plate is arranged on the valve rod and positioned in the air inlet chamber, the valve cover plate is arranged right opposite to the air outlet hole, the valve cover plate can move left and right in the air inlet chamber along with the valve rod, and a second gap is formed between the valve cover plate and the side wall of the air inlet chamber when the valve cover plate is positioned at the rightmost end;
the anti-leakage chamber is positioned at the outer side of the air inlet chamber and is connected with the first gap;
the anti-internal leakage chamber is positioned at the exhaust hole and is connected with the second gap.
Preferably, the thickness of the first gap is less than 2mm.
Preferably, the thickness of the second gap is less than 2mm.
Preferably, the inner leakage preventing chamber is an annular chamber, and the width x thickness of the annular chamber is as follows: 50x60mm.
Preferably, a small air hole is formed in the wall surface, located on one side of the second gap, of the annular cavity.
Preferably, the diameter of the small air holes is 4-6mm, all the small air holes are uniformly arranged on the wall surface of the annular chamber, and the distance between two adjacent small air holes is 35-40mm.
Preferably, the valve cover plate has a diameter greater than the diameter of the exhaust hole and equal to the outer diameter of the annular chamber.
Preferably, the leak-proof chamber is mounted on the partition.
Preferably, the valve rod further comprises bearings mounted on the intake chamber and the exhaust chamber, respectively, and the valve rod is mounted on the bearings.
Preferably, the driving device is a cylinder.
The beneficial effects of the invention are as follows: according to the maintenance-free full-sealed cut-off cover plate valve provided by the embodiment of the invention, the outer side of the air inlet chamber is provided with the outer leakage prevention chamber connected with the first gap, and the exhaust hole of the valve body is provided with the inner leakage prevention chamber connected with the second gap, so that the air seal between the air inlet chamber and the outside air and the air seal between the air inlet chamber and the exhaust chamber are realized, and the outer leakage and the inner leakage of gas are avoided; the valve rod is not contacted with the side wall of the air inlet chamber, and the valve cover plate is not contacted with the partition plate, so that the valve rod and the valve cover plate are prevented from being worn, and maintenance-free is realized; meanwhile, the plate wall of the rectangular ventilation pipeline on site is used as the valve body, so that the cost can be effectively reduced.
Drawings
FIG. 1 is a schematic diagram of the internal structure of a maintenance-free fully sealed shut-off cover valve according to an embodiment of the present invention;
FIG. 2 is an enlarged schematic view of a portion of FIG. 1 at position A;
FIG. 3 is an enlarged schematic view of a portion of FIG. 1 at position B;
fig. 4 is a schematic diagram of an internal structure of an open state of a maintenance-free fully-sealed shut-off cover valve according to an embodiment of the present invention.
In the figure, the meanings of the symbols are as follows:
the valve comprises a valve rod 1, a valve cover plate 2, a high-pressure gas pipeline 3, an inner leakage prevention chamber 4, an outer leakage prevention chamber 5, a rectangular ventilation pipeline 6, a partition plate 7, an air inlet chamber 8, an air outlet chamber 9, a driving device 10, a first gap 11, a second gap 12, a small air hole 13 and a bearing 14.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the detailed description is presented by way of example only and is not intended to limit the invention.
As shown in fig. 1-4, an embodiment of the present invention provides a maintenance-free full-sealed shut-off flap valve, comprising: the valve rod 1, the valve deck 2, the high-pressure gas pipeline 3, the inner leakage prevention cavity 4 and the outer leakage prevention cavity 5, the high-pressure gas pipeline 3 is connected with the inner leakage prevention cavity 4 and the outer leakage prevention cavity 5 respectively, the valve rod 1 is installed on the rectangular ventilation pipeline 6, the rectangular ventilation pipeline 6 is divided into an air inlet chamber 8 and an air outlet chamber 9 through a partition plate 7, one end of the valve rod 1 is located outside the air inlet chamber 8 and connected with a driving device 10, a first gap 11 is arranged between the valve rod 1 and the side wall of the air inlet chamber 8, the other end of the valve rod 1 penetrates through the partition plate 7 and is located in the air outlet chamber 9, an exhaust hole is formed in the partition plate 7, the valve deck 2 is installed on the valve rod 1, the valve deck 2 is located in the air inlet chamber 8, the valve deck 2 is opposite to the exhaust hole, the valve deck 2 can move left and right along with the valve rod 1 in the air inlet chamber 8, and a second gap 12 is arranged between the valve deck 2 and the side wall of the inner leakage prevention cavity 4 when the valve deck 2 is located at the rightmost end;
the anti-leakage chamber 5 is positioned at the outer side of the air inlet chamber 8, and the anti-leakage chamber 5 is connected with the first gap 11;
the inner leakage preventing chamber 4 is positioned at the exhaust hole, and the inner leakage preventing chamber 4 is connected with the second gap 12.
The working principle of the structure is as follows:
in the use, drive arrangement can drive the valve rod horizontal migration about, the valve rod drives valve deck horizontal migration about, when the valve deck left-hand motion, when keeping away from the exhaust hole, the gas in the inlet chamber can get into the exhaust chamber from the exhaust hole, and discharge from the gas vent that the exhaust chamber set up, in the equipment that is connected or in the air, when the valve deck right-hand motion, be close to the exhaust hole and lie in the extreme right, high-pressure gas is input through high-pressure gas pipeline, high-pressure gas gets into in the anti-internal leakage cavity from high-pressure gas pipeline, because anti-internal leakage cavity is connected with the second clearance, then high-pressure gas can get into the second clearance from anti-internal leakage cavity, at this moment, the second clearance has full high-pressure gas, and flow into inlet chamber and exhaust chamber from the second clearance, because high-pressure gas flow pressure in the second clearance is higher than the gas pressure in inlet chamber and the exhaust chamber, so, high-pressure gas flow in the second clearance can be continuous flow into inlet chamber and exhaust chamber, and the gas in the exhaust chamber in the inlet chamber then can not pass high-pressure gas curtain flow towards each other, gas mixing takes place. Therefore, when the valve cover plate is positioned at the rightmost end, the valve cover plate covers the exhaust hole, and meanwhile, the air seal between the air inlet chamber and the exhaust chamber is realized through the second gap, so that the occurrence of gas leakage is avoided.
In addition, no matter the valve deck moves leftwards or rightwards or is in a static state, high-pressure gas is input into the anti-leakage chamber through the high-pressure gas pipeline, and because the anti-leakage chamber is connected with the first gap, the high-pressure gas can enter the first gap from the anti-leakage chamber, so that the first gap is full of the high-pressure gas, and the high-pressure gas enters the air inlet chamber and the outside air through the first gap. Whereas, in view of the fact that the pressure of the high-pressure air flow is higher than the pressure of the air in the air inlet chamber and the outside air, the high-pressure air flow can continuously enter the air inlet chamber and the outside air, and the air in the air inlet chamber and the outside air cannot enter the anti-leakage chamber and are mutually mixed through the anti-leakage chamber, so that air seal between the air inlet chamber and the outside air is realized through the first gap, the air in the air inlet chamber is effectively prevented from entering the atmosphere through the first gap, and zero leakage is realized.
In the structure, as the first gap and the second gap are airtight, the valve rod is not contacted with the side wall of the rectangular ventilation pipeline (corresponding to the valve body), and the valve cover plate is not contacted with the rectangular ventilation pipeline (corresponding to the valve body), so that the valve rod and the valve cover plate are prevented from being rubbed with the rectangular ventilation pipeline (corresponding to the valve body) continuously in the continuous movement process, and abrasion is generated, and therefore, the valve rod, the valve cover plate and the rectangular ventilation pipeline (corresponding to the valve body) do not need to be replaced, and maintenance-free operation is realized.
In addition, the valve provided by the embodiment of the invention uses the plate wall of the rectangular ventilation pipeline on site as the valve body, so that the cost can be effectively reduced; meanwhile, the valve cover plate can be designed into a detachable structure, and is convenient to install and use on site.
In this embodiment, the thickness of the first gap 11 is less than 2mm.
The first gap must be at a distance to facilitate passage of the sealing gas and to form a high pressure zone in this area. The size of the first gap is smaller than 2mm, the overflow area of the first gap can be effectively reduced, and the flow rate of sealing gas is reduced on the premise that the sealing gas (high in pressure) always flows to a rectangular ventilation pipeline and the outside (low in pressure). Finally, the purpose of zero leakage (external leakage) of air flow (low pressure) in the valve is realized through a small amount of sealing air.
In this embodiment, the thickness of the second gap 12 is less than 2mm.
The second gap must be at a distance to facilitate passage of the sealing gas and to form a high pressure zone in this area. The size of the second gap is smaller than 2mm, the overflow area of the second gap can be effectively reduced, and the flow rate of the sealing gas is reduced on the premise that the sealing gas (high in pressure) always flows to the air inlet chamber and the air outlet chamber (low in pressure). Finally, the purpose of zero leakage (internal leakage) of air flow (low pressure) on the left side and the right side of the valve cover plate is realized through a small amount of sealing air.
In a preferred embodiment of the invention, the leak-proof chamber 4 is an annular chamber having a width x thickness of: 50x60mm.
The annular chamber is used for uniformly conveying the sealing gas to all the small air holes, and the cross-sectional area of the annular chamber is required to be larger than the sum of the areas of all the small air holes, so that the pressure in the second gap can be ensured to be always higher than the pressure on the left side and the right side of the valve cover plate.
In another preferred embodiment of the present invention, the wall surface of the annular chamber located at one side of the second gap 12 is provided with a small air hole 13.
The diameter of the small air holes 13 is 4-6mm, all the small air holes 13 are uniformly arranged on the wall surface of the annular chamber, and the distance between two adjacent small air holes 13 is 35-40mm.
In the actual use process, the groove can be formed in the wall surface of the annular chamber, the grooves are provided with small air holes, the small air holes are uniformly distributed in the groove in the upper wall surface of the annular chamber, the interval distance is 35-40mm, sealing gas can uniformly reach the groove in the upper wall surface of the annular chamber through the small air holes and uniformly reach the second gap through the annular groove, and finally flow from the upper side and the lower side of the second gap to the air inlet chamber and the air outlet chamber (with low pressure) so that the sealing gas achieves the effect of airtight seal.
In this embodiment, the valve cover plate 2 has a diameter greater than the diameter of the exhaust hole and equal to the outer diameter of the annular chamber.
The structure can directly determine the sealing capability of the second gap and also determine the sealing effect of the two sides of the valve cover plate. The diameter of the valve cover plate is the same as the outer diameter of the annular cavity, so that the area of the second gap is the largest, the sealing capacity of the second gap is the strongest, and the sealing effect on the left side and the right side of the second gap is the best.
In this embodiment, the leak-proof chamber 4 may be mounted on the partition 7.
In this embodiment, the leak-proof chamber may be fixed to the partition plate by bolts or the like.
As will be appreciated by those skilled in the art, the removable connection of the leak-proof chamber may also be performed in other ways.
The maintenance-free full-sealed cut-off cover plate valve provided by the embodiment of the invention can also comprise bearings 14, the bearings 14 can be respectively arranged on the air inlet chamber 8 and the air outlet chamber 9, and the valve rod 1 is arranged on the bearings 14.
The structure is in the use, drive arrangement drives the valve rod and controls horizontal movement to slide through the bearing, at the in-process of motion, drive the valve apron and control horizontal movement in the inlet chamber, when the valve deck moves left, when keeping away from the baffle, the gas of inlet chamber gets into in the exhaust chamber through the exhaust hole, when the valve deck moves right, be close to the baffle and reach when right-most, the exhaust hole is covered by the valve deck, the second clearance between valve apron and the interior chamber lateral wall of preventing leaking seals through high-pressure gas, thereby realize the airtight of valve.
The bearings used in this example were self-lubricating, high temperature resistant sliding bearings, and compared with the existing valves with seal rings (200 ℃), the temperature resistance was better (400 ℃).
In this embodiment, the driving device 10 may be a cylinder.
The cylinder moves horizontally to drive the valve rod, so as to drive the valve cover plate, and only the friction force is needed to be overcome, so that the self weight of the valve is not needed to be overcome, and the valve is flexible, quick, stable and contactless in operation.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained: according to the maintenance-free full-sealed cut-off cover plate valve provided by the embodiment of the invention, the outer side of the air inlet chamber is provided with the outer leakage prevention chamber connected with the first gap, and the exhaust hole of the valve body is provided with the inner leakage prevention chamber connected with the second gap, so that the air seal between the air inlet chamber and the outside air and the air seal between the air inlet chamber and the exhaust chamber are realized, and the outer leakage and the inner leakage of gas are avoided; the valve rod is not contacted with the side wall of the air inlet chamber, and the valve cover plate is not contacted with the partition plate, so that the valve rod and the valve cover plate are prevented from being worn, and maintenance-free is realized; meanwhile, the plate wall of the rectangular ventilation pipeline on site is used as the valve body, so that the cost can be effectively reduced.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which is also intended to be covered by the present invention.
Claims (7)
1. A maintenance-free fully sealed shut-off flap valve, comprising: the valve rod is arranged on the rectangular ventilation pipeline, the rectangular ventilation pipeline is divided into an air inlet chamber and an air outlet chamber through a partition plate, one end of the valve rod is positioned at the outer side of the air inlet chamber and connected with a driving device, a first gap is formed between the valve rod and the side wall of the air inlet chamber, the other end of the valve rod penetrates through the partition plate and is positioned in the air outlet chamber, an air outlet hole is formed in the partition plate, the valve cover plate is arranged on the valve rod and positioned in the air inlet chamber, the valve cover plate is arranged right opposite to the air outlet hole, the valve cover plate can move left and right in the air inlet chamber along with the valve rod, and a second gap is formed between the valve cover plate and the side wall of the air inlet chamber when the valve cover plate is positioned at the rightmost end;
the anti-leakage chamber is positioned at the outer side of the air inlet chamber and is connected with the first gap;
the inner leakage preventing cavity is positioned at the exhaust hole and is connected with the second gap;
when the valve cover plate is positioned at the rightmost end, the valve cover plate covers the exhaust hole, and the air seal between the air inlet chamber and the exhaust chamber is realized through the second gap, so that the occurrence of gas leakage is avoided; when the valve cover plate moves left and right or is static, the air seal between the air inlet chamber and the outside air is realized through the first gap, so that the occurrence of gas leakage is avoided;
the thickness of the first gap is smaller than 2mm; the thickness of the second gap is smaller than 2mm;
the inner leakage prevention chamber is an annular chamber, and a small air hole is formed in the wall surface of the annular chamber, which is positioned at one side of the second gap; the cross-sectional area of the annular chamber is greater than the sum of all the small pore areas.
2. The maintenance-free fully sealed shut-off cover plate valve according to claim 1, wherein the annular chamber has a width x thickness of: 50x60mm.
3. The maintenance-free full-sealed shut-off cover plate valve according to claim 1, wherein the diameter of the small air holes is 4-6mm, all the small air holes are uniformly arranged on the wall surface of the annular chamber, and the distance between two adjacent small air holes is 35-40mm.
4. The maintenance-free fully sealed shut-off flap valve according to claim 1, wherein the diameter of the valve cover plate is greater than the diameter of the vent hole and equal to the outer diameter of the annular chamber.
5. The maintenance-free, fully sealed shut-off cover valve of claim 1, wherein the leak-proof chamber is mounted to the diaphragm.
6. The maintenance-free, fully sealed shut-off cover valve according to claim 1, further comprising bearings mounted on said intake chamber and said exhaust chamber, respectively, said valve stem being mounted on said bearings.
7. The maintenance-free fully sealed shut-off flap valve of claim 1 wherein said driving means is a cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693932.2A CN107255171B (en) | 2017-08-14 | 2017-08-14 | Maintenance-free full-sealed cut-off cover plate valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693932.2A CN107255171B (en) | 2017-08-14 | 2017-08-14 | Maintenance-free full-sealed cut-off cover plate valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107255171A CN107255171A (en) | 2017-10-17 |
| CN107255171B true CN107255171B (en) | 2023-09-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710693932.2A Active CN107255171B (en) | 2017-08-14 | 2017-08-14 | Maintenance-free full-sealed cut-off cover plate valve |
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| CN (1) | CN107255171B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB782836A (en) * | 1954-10-22 | 1957-09-11 | Glenfield & Kennedy Ltd | Improvements in or relating to butterfly valves |
| CN85200166U (en) * | 1985-04-01 | 1986-01-29 | 中国科学院金属研究所 | Airseal high-temperature stop valve |
| CN202812245U (en) * | 2012-09-27 | 2013-03-20 | 扬州高标机械有限公司 | Elastic gas sealing butterfly valve for waste heat power generation |
| CN203067800U (en) * | 2013-02-06 | 2013-07-17 | 鞍山亨通阀门有限公司 | Sealing device for negative-pressure butterfly valve for recovering converter gas |
| CN106090256A (en) * | 2016-08-17 | 2016-11-09 | 上海开纯洁净室技术工程有限公司 | Floating type pressure reduction confined gas valve |
| CN206268473U (en) * | 2016-12-12 | 2017-06-20 | 江苏大信环境科技有限公司 | A kind of zero leakage sealing gland playing card valve |
| CN207080619U (en) * | 2017-08-14 | 2018-03-09 | 维珂瑞（北京）环境科技有限公司 | A kind of non-maintaining hermetically sealed cut-out cover plate valve |
-
2017
- 2017-08-14 CN CN201710693932.2A patent/CN107255171B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB782836A (en) * | 1954-10-22 | 1957-09-11 | Glenfield & Kennedy Ltd | Improvements in or relating to butterfly valves |
| CN85200166U (en) * | 1985-04-01 | 1986-01-29 | 中国科学院金属研究所 | Airseal high-temperature stop valve |
| CN202812245U (en) * | 2012-09-27 | 2013-03-20 | 扬州高标机械有限公司 | Elastic gas sealing butterfly valve for waste heat power generation |
| CN203067800U (en) * | 2013-02-06 | 2013-07-17 | 鞍山亨通阀门有限公司 | Sealing device for negative-pressure butterfly valve for recovering converter gas |
| CN106090256A (en) * | 2016-08-17 | 2016-11-09 | 上海开纯洁净室技术工程有限公司 | Floating type pressure reduction confined gas valve |
| CN206268473U (en) * | 2016-12-12 | 2017-06-20 | 江苏大信环境科技有限公司 | A kind of zero leakage sealing gland playing card valve |
| CN207080619U (en) * | 2017-08-14 | 2018-03-09 | 维珂瑞（北京）环境科技有限公司 | A kind of non-maintaining hermetically sealed cut-out cover plate valve |
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| Publication number | Publication date |
|---|---|
| CN107255171A (en) | 2017-10-17 |
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