CN102269280A - Negative pressure valve - Google Patents
Negative pressure valve Download PDFInfo
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- CN102269280A CN102269280A CN 201110201558 CN201110201558A CN102269280A CN 102269280 A CN102269280 A CN 102269280A CN 201110201558 CN201110201558 CN 201110201558 CN 201110201558 A CN201110201558 A CN 201110201558A CN 102269280 A CN102269280 A CN 102269280A
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- negative pressure
- flexible sheet
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Abstract
The invention relates to a negative pressure valve suitable for a sewage system. The valve comprises a valve body and a valve cover, wherein a valve cavity of the negative pressure valve is divided into a sewage inlet cavity, a sewage discharge cavity and a negative pressure control cavity; the negative pressure control cavity realizes the on-off of the sewage inlet cavity and the sewage discharge cavity through an elastic diaphragm arranged in the valve cavity; the edge of the elastic diaphragm is connected with a valve cavity wall of the valve cavity in a fixed and sealed mode; the negative pressure control cavity is formed by a cavity formed between the elastic diaphragm and the valve cover; a valve outlet is provided with a pipe body extending to the valve cavity; a pipe orifice of the pipe body is contacted with an external curved surface of the elastic diaphragm to divide the residual space of the valve cavity into the sewage inlet cavity and the sewage discharge cavity; the valve cover is provided with a negative pressure hole for connecting a negative pressure source; and the negative pressure hole is communicated with the negative pressure control cavity. The negative pressure valve has a simple structure, sealing reliability and a high opening speed and can be opened under low negative pressure.
Description
Technical field
The present invention relates to a kind of valve of negative pressure system, particularly a kind of negative pressure valve that is applicable to foul sewer system.
Background technique
Traditional negative pressure valve is used for the On/Off negative pressure channel, mainly comprises valve body, seal membrane and a lifting device that utilizes negative pressure for driving force.In most cases, the dirt inlet of valve body is in barotropic state, and the dirt-discherging outlet of opposite side is in negative pressure state, with the valve body center is the boundary, half of seal membrane born malleation, second half bears negative pressure, the lifting device polygamy closes pull bar, piston and/or magnet action, complex structure is when the seal membrane compressive deformation, can produce Installation Stress, usually cause the driving component of valve inner to produce deflection, when this deflection is delivered on the lifting gear, when lifting gear move down arrive spacing after, seal membrane has a return error, the reliability of influence sealing and the speed of lifting gear return.
Summary of the invention
Be to solve the above-mentioned defective of prior art, the invention provides a kind of simple in structure, sealing is reliable, the fast negative pressure valve of opening speed.
The technical solution adopted in the present invention is: a kind of negative pressure valve, comprise valve body and the valve gap that is installed on the valve body, the valve pocket of described negative pressure valve is separated into into dirty chamber, blowdown chamber and negative pressure control chamber, describedly enter dirty chamber and be provided with valve inlet, described blowdown chamber is provided with valve outlet port, described negative pressure control chamber is realized the described break-make of advancing between dirty chamber and the blowdown chamber by being arranged on bowl-shape flexible sheet in the described valve pocket, the valve cavity wall fixed seal connection of the edge of described flexible sheet and described valve pocket, the cavity that forms between described flexible sheet and the described valve gap constitutes described negative pressure control chamber, described valve outlet port place is provided with the separation body that extends in the described valve pocket, described separation contacts with the positive camber of described flexible sheet with the mouth of pipe of body, the remaining space of described valve pocket is separated into described advance dirty chamber and blowdown chamber, described valve gap is provided with the negative pressure hole that is used to connect sourceof negative pressure, and described negative pressure hole is communicated with described negative pressure control chamber.
Described flexible sheet preferably is described and advances the little and big special-shaped shape of position, blowdown chamber degree of crook of position, dirty chamber degree of crook.
The position of described separation body in described negative cavity preferably is partial to the valve outlet port side in the horizontal direction.
Described flexible sheet preferably adopts rubber to make.
Can be provided with the limit body that is used to limit described flexible sheet deformation quantity that extends in the described negative pressure control chamber on the described valve gap.
The length that described limit body extends is downwards preferably becoming greatly gradually along advancing the substantially horizontal of dirty chamber to the blowdown chamber, and described limit body preferably in a tubular form.
Enclose the straight extension edge that can be provided with on the substantially horizontal the outer Monday of described flexible sheet, described straight extension edge outer end can be provided with the annular protrusion perpendicular to described straight extension edge, can be provided with the annular groove that matches with described annular protrusion on the valve cavity wall of described valve pocket, described annular protrusion cooperates assembling to constitute described flexible sheet and the sealing of described valve cavity wall with described annular groove.
Can be provided with the annular protrusion that is used for described flexible sheet on the outer tube wall of described tubulose limit body and be pressed on annular boss in the annular groove on the described valve cavity wall, described annular boss preferably in horizontal direction.
Described valve outlet port can adopt dismountable Placement to be connected with to be used to connect the bend pipe or the straight tube of negative pressure line.
Described dismountable Placement is preferably described bend pipe by connecting described valve outlet port by a joint.
The direction of described valve outlet port preferably is 45 with substantially horizontal, and the bending part of described bend pipe preferably is 135 ° of angles.
Can be provided with circular groove on the orifice plane of the described valve outlet port of connection of described bend pipe or straight tube, can be equipped with seal ring in the described circular groove, the diameter of section of described seal ring is greater than the degree of depth of described circular groove, can be provided with the sealing surface that matches with described seal ring on the respective planes of described valve outlet port.
Describedly can be arranged to be suitable for the male and fomale(M﹠F) of manual rotary manipulation by the outer surface of appointing joint, the end that described bend pipe or straight tube are used to connect negative pressure line can be provided with inside/outside screw thread or the plug surface that matches with negative pressure line.
Groundwork process of the present invention is: the valve import connects source of sewage during use, and valve outlet port connects sourceof negative pressure or negative-pressure pipeline.Do not connect at the negative pressure control chamber under the situation of sourceof negative pressure, negative pressure control chamber and advance not have pressure reduction between the dirty chamber substantially, and sourceof negative pressure forms negative pressure by valve outlet port in the blowdown chamber, flexible sheet to place, blowdown chamber produces negative-pressure sucking thus, this part flexible sheet is pressed in tightly separates on the body, make into dirty chamber and blowdown chamber separate valve closing mutually; When the negative pressure control chamber connects sourceof negative pressure, negative pressure control chamber and blowdown chamber are under the same suction function, but because of the active area difference, the flexible sheet area of negative pressure control chamber side is much larger than blowdown chamber side, so the suction that negative pressure produces diaphragm in negative pressure control chamber side is corresponding just much larger than the suction of blowdown chamber side, simultaneously by separating structural relatively cooperation with body and each chamber, make diaphragm produce required deformation, break away from and the sealing of separating body, make sewage or other flowing mediums flow into the blowdown chamber swimmingly, realized the unlatching of valve by entering dirty chamber.
Beneficial effect of the present invention: be provided with owing to adopted specific flexible sheet shape and separated the position of using body, make flexible sheet when valve opening, can progressively and fully be out of shape, form effective ground medium passage, and when valve closing, by separate with the suction function in the body with and the cooperation of structure and position, be adsorbed on the mouth of pipe of separating with body firmly, form sealing reliably, the opening and closing that need not the negative pressure valve under the picture prior art form the negative pressure in the negative pressure control chamber except needs, also need the cooperation of lifting gear and/or resetting-mechanism, to prevent diaphragm because the part is subjected to suction function, part in addition is subjected to positive pressure and causes diaphragm seal not firm, and the situation that negative pressure valve leaks takes place; Because described flexible sheet adopts rubber to make, itself and described valve outlet port are extended between the interior body of valve pocket have certain foreign matter carrying capacity, as the grains of sand, cotton rope etc., foreign matter is as staying between flexible sheet and the body in the closed procedure of described negative pressure valve pass, described elastic membrane sector-meeting produce local in notch distortion, foreign matter hold and do not influence sealing effect, in ensuing blowdown process, the flexible sheet disengaging contacts with body, and foreign matter breaks away from flexible sheet under the washing away of fluid dirt.The design of described limit body can limit the deformation quantity of flexible sheet described in the described negative pressure valve opening process effectively, prevents that described flexible sheet is difficult to reset owing to deformation quantity is excessive; Described valve outlet port is by by appointing a joint removably to be connected with bend pipe, can change the flow direction of the fluid dirt that flows out from described negative pressure valve arbitrarily so that described negative pressure valve when inserting foul sewer system, can adapt to various differences towards negative pressure line.
The present invention is simple in structure, can guarantee the reliable sealing of negative pressure valve by described flexible sheet, and can realize reliable, the unlatching fast of negative pressure valve under less condition of negative pressure.
Description of drawings
Fig. 1 is the structural representation of an embodiment of the present invention closed condition;
Fig. 2 is the structural representation of Fig. 1 opening state;
Fig. 3 is the structural representation of the another kind of embodiment's closed condition of the present invention;
Fig. 4 is the structural representation of Fig. 3 opening state.
Embodiment
Referring to Fig. 1,2,3 and 4, the invention provides a kind of negative pressure valve that is applicable to foul sewer system, comprise valve body 1 and valve gap 2, described valve gap is installed in the top of described valve body by bolt, the valve pocket of described negative pressure valve is separated into into dirty chamber, blowdown chamber and negative pressure control chamber, describedly enter dirty chamber and be provided with valve inlet 3, described blowdown chamber is provided with valve outlet port 4, to make things convenient for circulation and the described negative pressure valve of fluid dirt in described negative pressure valve to insert sewage disposal system, described negative pressure control chamber is realized the described break-make of advancing between dirty chamber and the blowdown chamber by being arranged on bowl-shape flexible sheet 5 in the described valve pocket, the valve cavity wall fixed seal connection of the edge of described flexible sheet and described valve pocket, its positive camber is preferably towards the direction of described valve outlet port, negative camber is preferably towards the direction of described valve gap, make the cavity that forms sealing between described flexible sheet and the valve gap, this cavity constitutes described negative pressure control chamber, described valve outlet port is provided with the body that extends in the described valve pocket, the mouth of pipe of described body contacts with the positive camber of described flexible sheet, the remaining space of described valve pocket is separated into described advance dirty chamber and blowdown chamber, described valve gap is provided with the negative pressure hole 6 that is used to connect sourceof negative pressure, and described negative pressure hole is communicated with described negative pressure control chamber.When described negative pressure valve is applied to sewage disposal system, the valve inlet of described negative pressure valve is connected with source of sewage, describedly enter dirty chamber and be in barotropic state, valve outlet port is connected with negative pressure line, described blowdown chamber is in negative pressure state, and described negative pressure control chamber is in atmospheric pressure state, and described flexible sheet contacts with the mouth of pipe of body in described valve outlet port extends into described valve pocket under the suction function in described blowdown chamber, form sealing, described negative pressure valve is in closed condition; When needs are opened described negative pressure valve, make described negative pressure hole directly or by pipeline connect sourceof negative pressure indirectly, effect by sourceof negative pressure reduces the pressure in the described negative pressure control chamber gradually, make described negative pressure control chamber be in negative pressure state, negative pressure control chamber and blowdown chamber are under the same suction function, but because of the active area difference, the flexible sheet area of negative pressure control chamber side is much larger than blowdown chamber side, so the suction that negative pressure produces diaphragm in negative pressure control chamber side is corresponding just much larger than the suction of blowdown chamber side, diaphragm produces deformation, break away from and the sealing of separating with body, described negative pressure valve is opened.Close sourceof negative pressure, the negative pressure of negative pressure control chamber side disappears, flexible sheet under self elasticity and blowdown chamber side suction function, flexible sheet with separate the body sealing, described negative pressure valve cuts out.
The present invention is simple in structure, can guarantee the reliable sealing of negative pressure valve by described flexible sheet, and can under less condition of negative pressure, realize negative pressure valve reliably, opening and closing fast.
Described flexible sheet preferably adopts rubber to make, itself and described valve outlet port are extended between the mouth of pipe of the body in the valve pocket have certain foreign matter carrying capacity, as the grains of sand, cotton rope etc., described negative pressure valve closes in the closed procedure foreign matter as between flexible sheet as described in staying and the body, described elastic membrane sector-meeting produces local interior notch distortion, foreign matter is held and do not influence sealing effect, in ensuing blowdown process, described flexible sheet disengaging contacts with described body, and foreign matter breaks away from described flexible sheet under the washing away of fluid dirt.
Described flexible sheet preferably is described and advances the little and big special-shaped shape of position, blowdown chamber degree of crook of position, dirty chamber degree of crook, and correspondingly described separation is partial to the valve outlet port side in the horizontal direction with the optimum seeking site of body in described valve pocket.
Can be provided with the limit body 7 that is used to limit described flexible sheet deformation quantity that extends in the described negative pressure control chamber on the described valve gap, the length that described limit body extends downwards preferably becomes big direction gradually along the radius of curvature of described flexible sheet and diminishes gradually, to adapt to the shape of described flexible sheet, described limit body preferably in a tubular form.The design of described limit body can limit the deformation quantity of flexible sheet described in the described negative pressure valve opening process, particularly largest deformation amount effectively, prevents described flexible sheet and is difficult to reset in the closed procedure of described negative pressure valve pass because deformation quantity is excessive.
Enclose the straight extension edge that can be provided with on the substantially horizontal the outer Monday of described flexible sheet, described straight extension edge outer end can be provided with the annular protrusion perpendicular to described straight extension edge, can be provided with the annular groove that matches with described annular protrusion on the valve cavity wall of described valve pocket, described annular protrusion cooperates assembling to constitute the sealing of described flexible sheet and described valve cavity wall with described annular groove.Can be provided with the annular protrusion that is used for described flexible sheet on the outer tube wall of described tubulose limit body and be pressed on annular boss 8 in the annular groove on described valve cavity wall or the valve gap inwall, described annular boss preferably in horizontal direction.The fixing seal mode that adopts annular protrusion to match with annular groove, can effectively improve the sealing effect between described flexible sheet and described valve cavity wall or valve gap inwall, cooperate the extruding of the annular boss on the described tubulose limit body again, make described flexible sheet when elastic strain takes place still can and described valve cavity wall or valve gap inwall between keep good sealing.
Described valve outlet port can be connected with bend pipe 10 or straight tube by adopting by the mode of removably connecting of appointing joint 9, and described bend pipe or straight tube are used to connect negative pressure line.This kind design can change the flow direction of the fluid dirt that flows out from described negative pressure valve arbitrarily so that described negative pressure valve when inserting foul sewer system, can adapt to various differences towards negative pressure line.The direction of described valve outlet port preferably is 45 with substantially horizontal, the bending part of described bend pipe preferably is 135 ° of angles, adopt this kind angle design, rotate described bend pipe by control by a joint, can obtain the valve outlet port direction consistent with described valve inlet direction, also can obtain the valve outlet port direction vertical, can also obtain the valve outlet port direction of any direction on solid space with described valve inlet direction.
Can be provided with circular groove on the orifice plane of the described valve outlet port of connection of described bend pipe, can be equipped with seal ring in the described circular groove, the diameter of section of described seal ring is greater than the degree of depth of described circular groove, can be provided with the sealing surface that matches with described seal ring on the respective planes of described valve outlet port, to guarantee the sealing effect between described valve outlet port and bend pipe, prevent the leakage of fluid dirt.
The described male and fomale(M﹠F) that can be arranged to be suitable for manual rotary manipulation by the outer surface of appointing joint, convenient rotation is by appointing joint to adjust the direction of described winding pipe exit, the end that described bend pipe is used to connect negative pressure line can be provided with inside/outside screw thread or the plug surface that matches with negative pressure line, the convenient negative pressure line that connects.
Claims (10)
1. negative pressure valve, comprise valve body and the valve gap that is installed on the valve body, the valve pocket that it is characterized in that described negative pressure valve is separated into into dirty chamber, blowdown chamber and negative pressure control chamber, describedly enter dirty chamber and be provided with valve inlet, described blowdown chamber is provided with valve outlet port, described negative pressure control chamber is realized the described break-make of advancing between dirty chamber and the blowdown chamber by being arranged on bowl-shape flexible sheet in the described valve pocket, the valve cavity wall fixed seal connection of the edge of described flexible sheet and described valve pocket, the cavity that forms between described flexible sheet and the described valve gap constitutes described negative pressure control chamber, described valve outlet port place is provided with the separation body that extends in the described valve pocket, described separation contacts with the positive camber of described flexible sheet with the mouth of pipe of body, the remaining space of described valve pocket is separated into described advance dirty chamber and blowdown chamber, described valve gap is provided with the negative pressure hole that is used to connect sourceof negative pressure, and described negative pressure hole is communicated with described negative pressure control chamber.
2. negative pressure valve as claimed in claim 1, it is characterized in that described flexible sheet is described advances the little and big special-shaped shape of position, blowdown chamber degree of crook of position, dirty chamber degree of crook.
3. negative pressure valve as claimed in claim 2, it is characterized in that described valve gap is provided with the limit body that is used to limit described flexible sheet deformation quantity that extends in the described negative pressure control chamber, described separation is partial to the valve outlet port side in the horizontal direction with the position of body in described valve pocket.
4. negative pressure valve as claimed in claim 3 is characterized in that the length that described limit body extends is becoming big gradually along advancing the substantially horizontal of dirty chamber to the blowdown chamber downwards.
5. negative pressure valve as claimed in claim 4, outer Monday of the circle that it is characterized in that described flexible sheet is provided with the straight extension edge on the substantially horizontal, described straight extension edge outer end is provided with the annular protrusion perpendicular to described straight extension edge, the valve cavity wall of described valve pocket is provided with the annular groove that matches with described annular protrusion, and described annular protrusion cooperates assembling to constitute the sealing of described flexible sheet and described valve cavity wall with described annular groove.
6. negative pressure valve as claimed in claim 5, the outer tube wall that it is characterized in that described tubulose limit body are provided with the annular protrusion that is used for described flexible sheet and are pressed on annular boss in the annular groove on the described valve cavity wall.
7. as claim 1,2,3,4,5 or 6 described negative pressure valves, it is characterized in that described valve outlet port adopts dismountable Placement, be connected with the bend pipe or the straight tube that are used to connect negative pressure line.
8. negative pressure valve as claimed in claim 7 is characterized in that described dismountable Placement is that described bend pipe is by connecting described valve outlet port by a joint.
9. negative pressure valve as claimed in claim 8 is characterized in that the direction of described valve outlet port and substantially horizontal are 45, and the bending part of described bend pipe is 135 ° of angles.
10. negative pressure valve as claimed in claim 9, the orifice plane that it is characterized in that the described valve outlet port of connection of described bend pipe or straight tube is provided with circular groove, be equipped with seal ring in the described circular groove, the diameter of section of described seal ring is greater than the degree of depth of described circular groove, the respective planes of described valve outlet port is provided with the sealing surface that matches with described seal ring, describedly be arranged to be suitable for the male and fomale(M﹠F) of manual rotary manipulation by the outer surface of appointing joint, the end that described bend pipe or straight tube are used to connect negative pressure line is provided with inside/outside screw thread or the plug surface that matches with negative pressure line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110201558 CN102269280B (en) | 2011-07-19 | 2011-07-19 | Negative pressure valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110201558 CN102269280B (en) | 2011-07-19 | 2011-07-19 | Negative pressure valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102269280A true CN102269280A (en) | 2011-12-07 |
| CN102269280B CN102269280B (en) | 2013-06-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110201558 Active CN102269280B (en) | 2011-07-19 | 2011-07-19 | Negative pressure valve |
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| CN (1) | CN102269280B (en) |
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791118A (en) * | 2012-11-01 | 2014-05-14 | 宋志远 | Inverted vacuum diaphragm valve |
| CN104265945A (en) * | 2014-09-27 | 2015-01-07 | 李旭平 | High-speed rail pressure retaining blow-down valve |
| CN104613193A (en) * | 2015-01-26 | 2015-05-13 | 何西荣 | High-speed rail air pressure double-plug grey water valve |
| CN104806783A (en) * | 2015-03-03 | 2015-07-29 | 杭州聚川环保科技有限公司 | Fully-opened vacuum diaphragm valve |
| CN106308501A (en) * | 2015-06-24 | 2017-01-11 | 广东美的生活电器制造有限公司 | Coffee machine |
| CN106321883A (en) * | 2015-06-24 | 2017-01-11 | 广东美的生活电器制造有限公司 | Valve and coffee machine with valve |
| CN106321884A (en) * | 2015-06-24 | 2017-01-11 | 广东美的生活电器制造有限公司 | Valve body and beverage machine with same |
| CN106461096A (en) * | 2014-01-07 | 2017-02-22 | 桑杜科技有限公司 | Fluid-actuated flow control valves |
| CN107029308A (en) * | 2017-04-25 | 2017-08-11 | 上海契斯特医疗科技公司 | A kind of dry type drain valve and negative pressure drainage device |
| CN108488443A (en) * | 2018-05-28 | 2018-09-04 | 万若（北京）环境工程技术有限公司 | Liquid level Pneumatic valve and respective negative pressure water system and drainage by suction control method |
| CN112762197A (en) * | 2021-02-08 | 2021-05-07 | 天通控股股份有限公司 | Formula flow adjustable pneumatic valve is blocked in inflation based on high elastic material |
| US11103098B2 (en) | 2015-06-24 | 2021-08-31 | Guangdong Midea Consumer Electric Manufacturing Co., Ltd. | Valve, coffee maker having same, and method for controlling coffee maker |
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| DE9103865U1 (en) * | 1991-03-28 | 1992-07-30 | Siemens Ag, 8000 Muenchen, De | |
| CA2156968A1 (en) * | 1994-08-26 | 1996-02-27 | Roger D. Williams | Diaphragm valve |
| CN2809369Y (en) * | 2005-07-26 | 2006-08-23 | 姚正礼 | Self-driven diaphragm valve |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103791118A (en) * | 2012-11-01 | 2014-05-14 | 宋志远 | Inverted vacuum diaphragm valve |
| CN106461096A (en) * | 2014-01-07 | 2017-02-22 | 桑杜科技有限公司 | Fluid-actuated flow control valves |
| CN104265945A (en) * | 2014-09-27 | 2015-01-07 | 李旭平 | High-speed rail pressure retaining blow-down valve |
| CN104613193A (en) * | 2015-01-26 | 2015-05-13 | 何西荣 | High-speed rail air pressure double-plug grey water valve |
| CN104806783A (en) * | 2015-03-03 | 2015-07-29 | 杭州聚川环保科技有限公司 | Fully-opened vacuum diaphragm valve |
| CN106321884B (en) * | 2015-06-24 | 2019-08-27 | 广东美的生活电器制造有限公司 | Valve body and beverage dispenser with it |
| CN106321884A (en) * | 2015-06-24 | 2017-01-11 | 广东美的生活电器制造有限公司 | Valve body and beverage machine with same |
| CN106321883A (en) * | 2015-06-24 | 2017-01-11 | 广东美的生活电器制造有限公司 | Valve and coffee machine with valve |
| CN106321883B (en) * | 2015-06-24 | 2019-03-12 | 广东美的生活电器制造有限公司 | Valve body and coffee machine with the valve body |
| CN106308501B (en) * | 2015-06-24 | 2019-08-27 | 广东美的生活电器制造有限公司 | Coffee machine |
| CN106308501A (en) * | 2015-06-24 | 2017-01-11 | 广东美的生活电器制造有限公司 | Coffee machine |
| US11103098B2 (en) | 2015-06-24 | 2021-08-31 | Guangdong Midea Consumer Electric Manufacturing Co., Ltd. | Valve, coffee maker having same, and method for controlling coffee maker |
| CN107029308A (en) * | 2017-04-25 | 2017-08-11 | 上海契斯特医疗科技公司 | A kind of dry type drain valve and negative pressure drainage device |
| CN107029308B (en) * | 2017-04-25 | 2023-06-06 | 上海契斯特医疗器械有限公司 | Dry-type drainage valve and negative pressure drainage device |
| CN108488443A (en) * | 2018-05-28 | 2018-09-04 | 万若（北京）环境工程技术有限公司 | Liquid level Pneumatic valve and respective negative pressure water system and drainage by suction control method |
| CN108488443B (en) * | 2018-05-28 | 2024-01-23 | 万若（北京）环境工程技术有限公司 | Liquid level pneumatic control valve, corresponding negative pressure drainage system and negative pressure drainage control method |
| CN112762197A (en) * | 2021-02-08 | 2021-05-07 | 天通控股股份有限公司 | Formula flow adjustable pneumatic valve is blocked in inflation based on high elastic material |
| CN112762197B (en) * | 2021-02-08 | 2023-12-19 | 天通控股股份有限公司 | Expansion blocking type flow adjustable pneumatic valve based on high-elasticity material |
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| CN102269280B (en) | 2013-06-12 |
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