CN112228567A - Double-cutoff self-sealing high-pressure stop valve - Google Patents
Double-cutoff self-sealing high-pressure stop valve Download PDFInfo
- Publication number
- CN112228567A CN112228567A CN201910582022.6A CN201910582022A CN112228567A CN 112228567 A CN112228567 A CN 112228567A CN 201910582022 A CN201910582022 A CN 201910582022A CN 112228567 A CN112228567 A CN 112228567A
- Authority
- CN
- China
- Prior art keywords
- valve
- piston
- valve body
- clack
- area
- 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.)
- Pending
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 43
- 238000012856 packing Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000002457 bidirectional effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
-
- 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
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
-
- 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
- F16K41/00—Spindle sealings
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
Abstract
The invention discloses a double-cutoff self-sealing high-pressure stop valve which comprises a valve body, a valve clack, a piston sleeve, a piston, a valve cover and a valve rod, wherein the valve clack is arranged on the valve body; the piston sleeve is arranged in the valve body, and the valve cover is locked with the top of the valve body; the piston is arranged in the piston sleeve, the valve clack is arranged in the piston, and the valve clack penetrates through a guide hole of the piston sleeve and extends into a cavity of the valve body; the lower end of the valve rod is connected with the valve clack, and the valve rod and the valve clack are fixed through a nut; the middle of the valve clack is provided with a flow passage. The invention has compact and simple structure and convenient manufacture and maintenance; the working stroke is small, and the opening and closing time is short; the double-shutoff valve has double-shutoff function, and realizes the sealing performance of the valve through the self pressure of the medium. When the actuating mechanism can not work normally, no matter the medium enters from the upstream or the downstream of the valve, the valve can realize the sealing performance of the pipeline medium through the medium force, thereby realizing the double-cut sealing performance of the stop valve. And the actuating mechanism has the function of remotely controlling the opening and closing of the valve.
Description
Technical Field
The invention relates to the technical field of remote control valves, in particular to a double-block self-sealing high-pressure stop valve.
Background
With the rapid development of economy and industrial modernization in China, the parameters of large-scale aerospace, petrochemical and chemical devices are continuously improved, new technologies, new processes and new devices are continuously appeared, the requirements on remote control valves are increasingly strict, and the valve is particularly widely applied to ball valves and stop valves for cutting off main pipelines. In some specific environments and occasions (such as the situation that unexpected factors such as sudden power failure and gas failure of an actuating mechanism cannot work normally), the valve is required to have bidirectional sealing performance, namely, the medium of a downstream pipeline is prevented from flowing back to the upstream to cause serious loss or damage.
In the past, ball valves basically have the performance of bidirectional sealing, however, for large-caliber and high-pressure ball valves, the actuating mechanism is generally larger, occupies space, is inconvenient to operate and is expensive. The remotely operated stop valve does not have the performance of bidirectional sealing, and the stop valve is always in the existence of a bottleneck.
Disclosure of Invention
The invention aims to solve the defect that a stop valve in the prior art cannot be sealed in a two-way mode, and provides a double-block self-sealing high-pressure stop valve capable of achieving two-way sealing.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-cutoff self-sealing high-pressure stop valve comprises a valve body, a valve clack, a piston sleeve, a piston, a valve cover and a valve rod; the valve body is provided with a low-level port, a high-level port and a top port, and all the ports are communicated in the valve body; the piston sleeve is arranged in the valve body, and the valve cover is locked with the top of the valve body; guide holes are respectively arranged in the middle of the valve body and the piston sleeve; the piston is arranged in the piston sleeve, the valve clack is arranged in the piston, the lower end of the valve clack penetrates through a guide hole of the piston sleeve to extend into a cavity of the valve body and contact with the valve body, an area a is formed between the valve clack and a low-level port of the valve body, and an area c is formed between the valve clack and a high-level port of the valve body; the upper end of the valve rod penetrates through a guide hole of the valve body to be connected with an air cylinder, the lower end of the valve rod is connected with the valve clack, and the valve rod and the valve clack are fixed through a nut; the space enclosed by the piston sleeve, the valve cover, the valve body and the valve rod is a region b; a flow channel is arranged in the middle of the valve clack and is used for communicating the area a with the area b; the stress area of the bottom of the valve clack in the area a is Aa; the force-bearing area of the top of the piston in the b area is Ab, and Ab > Aa; the side of the valve clack is provided with an upper stress surface and a lower stress surface in a c area, the stress areas are Ac1 and Ac2 respectively, and Ac1 is larger than Ac 2.
Preferably, O-shaped rings are respectively arranged between the contact surfaces of the piston sleeve and the valve body, between the contact surfaces of the piston and the piston sleeve, and between the valve clack and the contact surfaces of the piston and the piston sleeve.
Preferably, the valve cover and the valve body are locked through bolts and nuts.
Preferably, the top of the valve cover is fixed with the bottom of the support through a bolt, the support is a column support, the travel switch is installed on the support, the top of the support is fixed with the cylinder, and the cylinder is connected with the upper end of the valve rod through the cylinder shaft and the connecting sleeve.
Preferably, a packing is arranged between the valve rod and the valve cover.
The invention has the beneficial effects that:
the double-cutoff self-sealing high-pressure stop valve has the advantages of compact and simple structure and convenience in manufacturing and maintenance; the working stroke is small, and the opening and closing time is short; the double-shutoff valve has double-shutoff function, and realizes the sealing performance of the valve through the self pressure of the medium. When the actuating mechanism can not work normally, no matter the medium enters from the upstream or the downstream of the valve, the valve can realize the sealing performance of the pipeline medium through the medium force, thereby realizing the double-cut sealing performance of the stop valve. And the actuating mechanism has the function of remotely controlling the opening and closing of the valve.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention (medium low in and high out).
Fig. 2 is a schematic cross-sectional view of the present invention (medium high in and low out state).
FIG. 3 is a schematic view of an embodiment of the present invention (angled double block self-sealing high pressure shut-off valve).
FIG. 4 is a schematic view of an embodiment of the present invention (straight through double block self sealing high pressure stop valve).
In the figure: 1. a valve body; 2. a valve flap; 3. an O-shaped ring; 4. a piston sleeve; 5. a piston; 6. a nut; 7. a valve cover; 8. a valve stem; 9. a filler; 10. a bolt and a nut; 11. a support; 12. a travel switch; 13. connecting sleeves; 14. a cylinder shaft; 15. and a cylinder.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
The structure form of the invention is as follows: referring to fig. 1 and 2, the double-block self-sealing high-pressure stop valve of the invention mainly comprises a valve body 1, a valve clack 2, an O-shaped ring 3, a piston sleeve 4, a piston 5, a screw cap 6, a valve cover 7 and a valve rod 8. The valve body 1 is provided with a low-position port and a high-position port, in the embodiment of fig. 1 and 2, the low-position port is positioned at the bottom of the valve body 1, the high-position port is positioned at the side of the valve body 1, the top of the valve body 1 is also provided with ports, and the ports are communicated in the valve body 1; the piston sleeve 4 is arranged in the valve body 1, and the valve cover 7 is locked with the top of the valve body 1, so that the piston sleeve 4 is limited in the valve body 1; guide holes are respectively arranged in the middle of the valve body 1 and the piston sleeve 4; the piston 5 is arranged in the piston sleeve 4, the valve clack 2 is arranged in the piston 5, and the lower end of the valve clack 2 penetrates through a guide hole of the piston sleeve 4 to extend into a cavity of the valve body 1 and contact with the valve body 1, so that an area a is formed between the valve clack 2 and a low-level port of the valve body 1, and an area c is formed between the valve clack 2 and a high-level port of the valve body 1; the upper end of the valve rod 8 penetrates through a guide hole of the valve body 1 to be connected with the cylinder, the lower end of the valve rod 8 is connected with the valve clack 2, and the valve rod 8 and the valve clack 2 are fixed through a nut 6; o-rings 3 are respectively arranged between the contact surfaces of the piston sleeve 4 and the valve body 1, between the contact surfaces of the piston 5 and the piston sleeve 4, and between the valve clack 2 and the contact surfaces of the piston 5 and the piston sleeve 4; a space enclosed by the piston sleeve 4, the valve cover 7, the valve body 1 and the valve rod 8 is called as a region b; a flow channel I is arranged in the middle of the valve clack 2, corresponding flow channels are also arranged in the valve rod 8 and the screw cap 6, and the flow channels connect the area a with the area b. The bottom of the valve clack 2 is provided with a stress plane in the area a, and the stress area is Aa; the top of the piston 5 is provided with a stress plane in the area b, and the stress area is Ab; an upper stress inclined plane and a lower stress inclined plane are arranged in a region c on the side of the valve clack 2, and the stress areas of the upper stress inclined plane and the lower stress inclined plane are Ac1 and Ac2 respectively.
Referring to fig. 3 and 4, the bolt and nut 10 locks the bonnet 7 with the valve body 1; the support 11 is a column support, the travel switch 12 is installed on the support 11, the bottom of the support 11 is fixed with the valve cover 7 through a bolt, the top of the support 11 is fixed with the cylinder 15, and the cylinder 15 is connected with the upper end of the valve rod 8 through the cylinder shaft 14 and the connecting sleeve 13 and used for driving the valve rod 8 to rotate; and a packing 9 is arranged between the valve rod 8 and the valve cover 7. Through the connecting sleeve 13, the cylinder 15 drives the valve rod 8 and the valve clack 2 to do vertical linear motion through the cylinder shaft 14, and the valve opening and closing effect is achieved. When the cylinder 15 drives the valve rod 8 and the valve clack 2 to move upwards, the valve is opened, and otherwise, the valve is closed. When the cylinder 15 fails, the medium force acts on the piston 5 to close the valve, so that the double-cut-off sealing effect is achieved.
The working principle of the invention is as follows: as shown in FIG. 1, when the valve is in the low-in and high-out state, the medium enters from the area a of the valve, and simultaneously enters into the area b through the flow channel I. The medium entering the area b acts on the piston, and under the action of the medium force, the piston generates a downward moving force, and meanwhile, the acting force acting on the piston is transmitted to the valve clack, so that the valve clack also moves downward until the valve is closed. Since the force F is PA, the areas a and b of the valve are also subjected to the pressure P applied by the medium, and the diameter of the flow passage in the area a of the valve is constant, the force-bearing area Aa in the area a is also constant, so that when the force-bearing area Ab in the area b is increased, i.e. the diameter of the piston is increased, the force applied by the medium on the piston can be increased. When the difference Ab-Aa between the stress area Ab of the area b and the stress area Aa of the area a is increased to a proper value, the sealing performance of the valve can be realized by calculating the sealing specific pressure of the sealing surface (the calculation of the sealing specific pressure is a known technology in the field) so that the total acting force acting on the valve clack and the sealing surface of the valve body meets the specific pressure value required by the sealing of the valve.
For the same reason, as shown in FIG. 2As shown, when the valve is in high inlet and low outlet and the medium enters from the area c of the valve, the stress area delta Ac (delta Ac is Ac) acting on the valve clack is fully considered1-Ac2) When the c area is acted on the valve clack, the stress area Delta Ac is Ac ═ Ac1-Ac2And (3) calculating the specific sealing pressure of the sealing surface (the calculation of the specific sealing pressure is well known in the art) to enable the total acting force acting on the sealing surface of the valve clack and the valve body to meet the specific pressure value required by the sealing of the valve, so that the sealing performance of the valve can be realized.
Through the design, when the executing mechanism (cylinder) can not work normally due to unexpected factors such as sudden power failure and gas failure, no matter when the medium enters from the upstream or the downstream of the valve, the valve can realize the sealing performance of the pipeline medium through the medium force, thereby realizing the double-cut sealing performance of the stop valve. And the actuating mechanism (cylinder) has the function of remotely controlling the opening and closing of the valve. And the design has proven its feasibility through practice, with consistent acceptance among existing customers.
The criteria of the invention are: design criteria are as follows: BS 1873, JB/T450, ASME B16.34; the flange standard is as follows: HG/T20615, ASME B16.5; structure length: marking the factory; temperature and pressure standards: ASME B16.34; test and test standards: API 598.
The product of the invention is characterized in that: the structure is compact and simple, the appearance is beautiful, and the manufacture and the maintenance are convenient; the working stroke is small, and the opening and closing time is short; the valve has double cutting-off function; the flow direction of the valve medium is not required, and low inlet and high outlet or high inlet and low outlet are allowed; the sealing performance is good, no friction exists between sealing surfaces, and the service life is long; the valve is flexible to open and close; the sealing effect is good, and the erosion and corrosion resistance is realized; the applicable pressure is large, and the use pressure can reach 42MPa (2500 LB).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. A double-cutoff self-sealing high-pressure stop valve is characterized by comprising a valve body, a valve clack, a piston sleeve, a piston, a valve cover and a valve rod; the valve body is provided with a low-level port, a high-level port and a top port, and all the ports are communicated in the valve body; the piston sleeve is arranged in the valve body, and the valve cover is locked with the top of the valve body; guide holes are respectively arranged in the middle of the valve body and the piston sleeve; the piston is arranged in the piston sleeve, the valve clack is arranged in the piston, the lower end of the valve clack penetrates through a guide hole of the piston sleeve to extend into a cavity of the valve body and contact with the valve body, an area a is formed between the valve clack and a low-level port of the valve body, and an area c is formed between the valve clack and a high-level port of the valve body; the upper end of the valve rod penetrates through a guide hole of the valve body to be connected with an air cylinder, the lower end of the valve rod is connected with the valve clack, and the valve rod and the valve clack are fixed through a nut; the space enclosed by the piston sleeve, the valve cover, the valve body and the valve rod is a region b; a flow channel is arranged in the middle of the valve clack and is used for communicating the area a with the area b; the stress area of the bottom of the valve clack in the area a is Aa; the force-bearing area of the top of the piston in the b area is Ab, and Ab > Aa; the side of the valve clack is provided with an upper stress surface and a lower stress surface in a c area, the stress areas are Ac1 and Ac2 respectively, and Ac1 is larger than Ac 2.
2. The double-cutoff self-sealing high-pressure stop valve according to claim 1, wherein O-rings are respectively arranged between the contact surfaces of the piston sleeve and the valve body, between the contact surfaces of the piston and the piston sleeve, and between the valve clack and the contact surfaces of the piston and the piston sleeve.
3. A double block self sealing high pressure stop valve according to claim 1, wherein the valve cover and the valve body are locked by bolts and nuts.
4. A double-block self-sealing high-pressure stop valve according to claim 1, wherein the top of the valve cover is fixed to the bottom of a support through a bolt, the support is a column support, the travel switch is mounted on the support, the top of the support is fixed to a cylinder, and the cylinder is connected to the upper end of the valve rod through a cylinder shaft and a connecting sleeve.
5. A double block self sealing high pressure stop valve according to claim 1 wherein a packing is provided between the valve stem and the bonnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910582022.6A CN112228567A (en) | 2019-06-30 | 2019-06-30 | Double-cutoff self-sealing high-pressure stop valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910582022.6A CN112228567A (en) | 2019-06-30 | 2019-06-30 | Double-cutoff self-sealing high-pressure stop valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112228567A true CN112228567A (en) | 2021-01-15 |
Family
ID=74111653
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910582022.6A Pending CN112228567A (en) | 2019-06-30 | 2019-06-30 | Double-cutoff self-sealing high-pressure stop valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112228567A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT108818B (en) * | 1926-05-08 | 1928-02-10 | Huebner & Mayer Fa | Self-acting shut-off device. |
| CN104747743A (en) * | 2013-12-26 | 2015-07-01 | 湖北高中压阀门有限责任公司 | Low and medium-pressure pneumatic balanced stop valve |
| CN105508627A (en) * | 2015-12-24 | 2016-04-20 | 华中科技大学 | High-pressure pipeline manual balance type valve |
| CN107131353A (en) * | 2017-04-25 | 2017-09-05 | 中国船舶重工集团公司第七二五研究所 | A kind of two-way low operational torque high-pressure stop valve |
| CN210715963U (en) * | 2019-06-30 | 2020-06-09 | 上海瑞控阀门有限公司 | Double-cutoff self-sealing high-pressure stop valve |
-
2019
- 2019-06-30 CN CN201910582022.6A patent/CN112228567A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT108818B (en) * | 1926-05-08 | 1928-02-10 | Huebner & Mayer Fa | Self-acting shut-off device. |
| CN104747743A (en) * | 2013-12-26 | 2015-07-01 | 湖北高中压阀门有限责任公司 | Low and medium-pressure pneumatic balanced stop valve |
| CN105508627A (en) * | 2015-12-24 | 2016-04-20 | 华中科技大学 | High-pressure pipeline manual balance type valve |
| CN107131353A (en) * | 2017-04-25 | 2017-09-05 | 中国船舶重工集团公司第七二五研究所 | A kind of two-way low operational torque high-pressure stop valve |
| CN210715963U (en) * | 2019-06-30 | 2020-06-09 | 上海瑞控阀门有限公司 | Double-cutoff self-sealing high-pressure stop valve |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN212616425U (en) | Double-cylinder pneumatic belt manual wedge gate valve | |
| CN110671502B (en) | Water hammer resistant stop valve | |
| CN210715963U (en) | Double-cutoff self-sealing high-pressure stop valve | |
| WO2012122809A1 (en) | Maglev intelligent valve | |
| CN209909221U (en) | Critical ball valve | |
| CN202746633U (en) | Double-isolation flat gate valve | |
| CN112228567A (en) | Double-cutoff self-sealing high-pressure stop valve | |
| CN111692371A (en) | Long-life ball valve | |
| CN203023511U (en) | High-pressure and high-pressure-difference balanced valve | |
| CN210770333U (en) | Sand prevention gate valve | |
| CN106763934B (en) | Double-drive quick-closing lifting type non-return and stop combined valve | |
| CN105065701A (en) | Hard sealing lifting type brake plug valve and control method thereof | |
| CN210739387U (en) | Y-shaped ultra-low temperature quick stop valve | |
| CN110848429A (en) | Cut-off double-purpose valve | |
| CN210531618U (en) | Pneumatic stop valve for high-pressure oxygen | |
| CN209743602U (en) | Low-flow-resistance multifunctional liquid methane bacterium type valve | |
| CN110220014B (en) | Low operating torque high pressure stop valve | |
| CN2833271Y (en) | Pneumatic pipe stop valve | |
| CN219472760U (en) | Ultralow-temperature large-caliber low-noise cage type control valve | |
| CN102155581B (en) | Multiple-sealing and split-flow decompression throttling stop valve | |
| CN215891125U (en) | High-pressure angle type throttling stop valve | |
| CN210600226U (en) | Double-cutoff bottom valve | |
| CN2460810Y (en) | Full-sealed no-leakage multipurpose valve | |
| CN220622815U (en) | Antioxidant double-internal-thread ball valve | |
| CN214500063U (en) | Lower-mounted double-switch stop valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |