CN214063902U - Integrated high-low pressure limiting valve - Google Patents
Integrated high-low pressure limiting valve Download PDFInfo
- Publication number
- CN214063902U CN214063902U CN202120015516.9U CN202120015516U CN214063902U CN 214063902 U CN214063902 U CN 214063902U CN 202120015516 U CN202120015516 U CN 202120015516U CN 214063902 U CN214063902 U CN 214063902U
- Authority
- CN
- China
- Prior art keywords
- pressure
- oil
- shell
- low
- pressure piston
- 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.)
- Active
Links
Images
Landscapes
- Safety Valves (AREA)
Abstract
The application relates to the field of control valves, and discloses an integrated high-low pressure limiting valve which is used for controlling the opening and closing of a gas transmission pipeline according to the gas pressure of the gas transmission pipeline and comprises a shell, wherein two ends of the shell are communicated with the gas transmission pipeline in parallel; the movable unit is arranged in the shell and is subjected to preset pressure provided by hydraulic oil arranged in the shell, and the movable unit moves according to the difference value of air pressure of the gas transmission pipeline and the preset pressure; and the control unit is connected with the movable unit and a safety valve for controlling the gas transmission pipeline to be opened and closed, and controls the safety valve to open and close the gas transmission pipeline according to the position of the movable unit. According to the method, the high-low pressure limiting of the acid gas pipeline is realized through hydraulic pressure, the pressure limiting value is visual and controllable, the pressure control precision of the acid gas pipeline is improved, and the period of detecting the pressure limiting range is shortened.
Description
Technical Field
The application relates to the field of control valves, in particular to an integrated high-low pressure limiting valve.
Background
The large marine acid gas field with high hydrogen sulfide content has the common characteristics of deep gas layer burial, complex ground gathering and transportation process, high wellhead pressure and the like. The gas well reduces the oil pressure of the well mouth to the pressure capable of being output through three-stage throttling, and the oil is conveyed to a purification plant through a pipe for desulfurization treatment. In order to ensure the safe production of the gas field, high-pressure and low-pressure limiting valves are installed after the primary throttling of each well station as a favorable measure for ensuring the safe production of the gas well. The main function of the device is to realize that the pressure of the oil circuit is controlled by removing the ground safety valve after the primary throttling when the pressure is lower than a low pressure set value or higher than a high pressure set value, so that the ground safety valve is closed, and the gas well is cut off.
The high-low pressure limiting valve realizes high-low pressure limiting closing of the connected sour gas pipeline by setting the pre-tightening force of the built-in spring, because the spring is fatigue, long-time compression can lead to elastic force to change, the elastic force can not be accurately controlled, and the pressure limiting value needs to be regularly measured, ground control pressure is rapidly released and raised for many times when the pressure limiting value is measured, the damage of a sealing part of a pressure regulating valve in a wellhead control cabinet is easily caused, and the frequent pressure supplementing or abnormal well closing of the control cabinet is caused.
SUMMERY OF THE UTILITY MODEL
In order to solve prior art and have the inside early warning power that relies on the spring of limit valve to accomplish the function, because the elasticity change of spring leads to the problem that the voltage limiting value of limit valve changes easily, this application provides an integral type high-low pressure limit valve who utilizes hydraulic oil to provide preset pressure for limit valve.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
an integrated high-low pressure limit valve is used for controlling the opening and closing of a gas transmission pipeline according to the gas pressure of the gas transmission pipeline and comprises a shell, wherein two ends of the shell are communicated with the gas transmission pipeline in parallel; the movable unit is arranged in the shell and is subjected to preset pressure provided by hydraulic oil arranged in the shell, and the movable unit moves according to the difference value of air pressure of the gas transmission pipeline and the preset pressure; and the control unit is connected with the movable unit and a safety valve for controlling the gas transmission pipeline to be opened and closed, and controls the safety valve to open and close the gas transmission pipeline according to the position of the movable unit.
The existing high-pressure and low-pressure limiting valves realize the function of limiting pressure in a pipeline by combining a high-pressure limiting valve and a low-pressure limiting valve. When the pressure of the sour gas pipeline exceeds the set pressure of the high-pressure limiting valve, the high pressure pushes the piston of the high-pressure limiting valve to move, so that the ground safety valve controls the pressure pipeline to release oil return, the ground safety valve is closed emergently, and the sour gas source is cut off; when the pressure of the sour gas pipeline is lower than the set pressure of the low-pressure limiting valve, the spring pushes the piston of the low-pressure limiting valve to move, so that the ground safety valve controls the pressure pipeline to release pressure and return oil, the ground safety valve is closed emergently, and the sour gas is prevented from flowing back to the shaft. The limiting valve provides pressure by means of a spring which is a component easy to age and unstable in pressure value, accurate control is difficult to achieve, in addition, the arrangement of the two limiting valves causes a pipeline to be more complicated, and equipment maintenance and repair cost is increased.
The limiting valve in this scheme is parallelly connected with the gas transmission line on the one hand for the pressure variation of gas transmission line can change the motion of activity unit into, and is specific, and the pressure of hydraulic oil is as predetermineeing the atmospheric pressure value in the shell, and when the atmospheric pressure of gas transmission line was outside predetermineeing the scope of atmospheric pressure value, the activity unit moved because of the both sides atress difference. On the other hand, the control unit in the limiting valve is connected with a safety valve for controlling the gas transmission pipeline to be opened and closed, so that the motion energy of the movable unit is converted into control information sent to the safety valve by the control unit.
Furthermore, the movable unit comprises an oil cavity arranged in the shell, and a high-pressure piston and a low-pressure piston which are respectively arranged at two ends of the oil cavity, wherein the high-pressure piston and the low-pressure piston are both positioned between two connecting positions where the shell is communicated with a gas transmission pipeline in parallel; the oil cavity is communicated with an external constant-pressure hydraulic source through an oil inlet pipe, and a ball valve and an overflow valve are sequentially arranged on the oil inlet pipe in the direction away from the oil cavity.
The movable unit in this scheme includes two pistons, for being full of the oil pocket of hydraulic oil between two pistons, hydraulic oil provides the preset pressure value of limit valve, and simultaneously, two pistons are located between the parallel connection department of shell and gas pipeline for the both ends of piston receive the pressure that atmospheric pressure provided in hydraulic oil and the gas pipeline respectively, thereby, when atmospheric pressure in the gas pipeline changes, the piston moves for balanced atress, the motion of piston arouses the control unit to the relief valve transmission signal switching gas pipeline.
Specifically, when the air pressure in the air transmission pipeline is higher than the preset pressure value of the limiting valve, the high-pressure piston and the low-pressure piston are pushed to move towards the directions close to each other, so that the hydraulic oil in the oil cavity is extruded out through the oil inlet pipe, and the hydraulic oil overflows through the overflow valve. When the air pressure in the air transmission pipeline is lower than the preset pressure value of the limiting valve, the pressure value of hydraulic oil borne by the piston is larger, and the distance between the high-pressure piston and the low-pressure piston is increased.
Furthermore, the control unit comprises an oil return pipe, one end of the oil return pipe is connected with the safety valve, the other end of the oil return pipe is provided with two openings communicated with the inside of the shell, and an oil discharge pipe is further arranged at the other end of the shell in the radial direction of the joint of the oil return pipe and the shell; and oil return channels matched with the oil return pipe and the oil discharge pipe are arranged on the high-pressure piston and the low-pressure piston, and the oil return channels are communicated with the oil return pipe and the oil discharge pipe to close the safety valve by the movement of the high-pressure piston or the low-pressure piston.
According to the scheme, the oil return channel is arranged in the piston, and the communication between the oil return pipe and the oil discharge pipe is determined by utilizing the motion of the piston, so that the motion energy of the piston caused by the air pressure change of the gas transmission pipeline is converted into the opening and closing of an oil return passage of the safety valve, the transmission of control information in a theoretical sense is realized by utilizing a mechanical structure, and the service life of the limiting valve and the accuracy of information transmission are ensured. It is worth mentioning that the piston moves from the initial position to the position where the oil return pipe is communicated with the oil return channel, and a sufficient pressure value is required between the hydraulic oil and the air pressure of the air pipeline, and the pressure value determines the pressure range of the limiting valve in the application.
Furthermore, a limiting step used for limiting the moving positions of the high-pressure piston and the low-pressure piston is arranged in the shell, and when the safety valve is closed, the high-pressure piston and the low-pressure piston move to the position where the oil return channel, the oil return pipe and the oil discharge pipe are communicated furthest.
Furthermore, one side of the high-pressure piston, which is far away from the low-pressure piston, is also provided with a fixed step, and when the air pressure of the air delivery pipeline is lower than the preset pressure, the fixed step is abutted against the high-pressure piston.
Furthermore, a vent hole is formed in the side wall of the shell and close to one end of the low-pressure piston. The vent hole is convenient for setting and debugging preset pressure after the installation of the limiting valve is finished, and the pressure limiting range of the limiting valve is tested in daily maintenance. In addition, the arrangement of the vent hole can prevent pressure building.
The beneficial effect of this application:
(1) the high-low pressure limit of the acid gas pipeline is realized through hydraulic pressure, and the pressure limiting value is visual and controllable.
(2) The period of detecting the pressure limiting range is reduced, and the damage risk of the pressure regulating valve of the control cabinet is reduced.
(3) The pressure control precision of the acid gas pipeline is improved, and the working strength of later maintenance is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a limit valve in this application connected to a safety valve and a gas line;
FIG. 2 is a schematic sectional view taken along the section A-A in FIG. 1;
FIG. 3 is a schematic view of the structure of a limiting valve when the gas line pressure is normal in the present application;
FIG. 4 is an enlarged partial schematic view at B of FIG. 3;
FIG. 5 is a schematic view of a stop valve for use in the present application when the gas line is at an overpressure;
FIG. 6 is a schematic view of the structure of the check valve when the gas line pressure is low in this application.
In the figure: 1-gas transmission pipeline; 2-a housing; 3-a high pressure piston; 4-an oil discharge pipe; 5-an oil inlet pipe; 6-oil chamber; 7-a low pressure piston; 8-an oil return pipe; 9-safety valve; 10-an oil return passage; 11-fixing a step; 12-a ball valve; 13-relief valve; 14-a limit step; 15-air vent.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Example 1:
the integrated high-low pressure limiting valve shown in fig. 1 is used for controlling the opening and closing of a gas transmission pipeline 1 according to the gas pressure of the gas transmission pipeline 1, and comprises a shell 2 which is connected with the gas transmission pipeline 1 in parallel; the movable unit is positioned in the shell 2 and is subjected to preset pressure provided by hydraulic oil arranged in the shell 2, and the movable unit moves according to the difference value of the air pressure of the gas transmission pipeline 1 and the preset pressure; and the control unit is connected with the movable unit and a safety valve 9 for controlling the gas transmission pipeline 1 to open and close, and controls the safety valve 9 to open and close the gas transmission pipeline 1 according to the position of the movable unit.
The working principle is as follows:
as shown in figure 1, the limiting valve in this application is connected with gas transmission pipeline 1 from two positions, on the one hand, parallelly connected with 1 middle section of gas transmission pipeline for the activity unit receives the dual function of 2 inside hydraulic oil of shell and 1 atmospheric pressure of gas transmission pipeline, and on the other hand utilizes the control unit to establish ties activity unit and sets up the relief valve 9 at 1 inlet end of gas transmission pipeline, converts the position information of activity unit into the control action that the control unit transmitted to relief valve 9. When the air pressure in the air transmission pipeline 1 does not exceed the preset pressure range, the movable unit keeps static or the activity of the movable unit does not cause the control unit to transmit control action to the safety valve 9, when the air pressure in the air transmission pipeline 1 is higher than the preset pressure, the air pressure pushes the movable unit to move, when the moving distance of the movable unit is enough, the control unit triggers the safety valve 9, and the safety valve 9 closes the air transmission pipeline 1. When the air pressure in the gas transmission pipeline 1 is lower than the preset pressure, the pressure provided by the hydraulic oil in the shell 2 pushes the movable unit to move, and when the moving distance of the movable unit is enough, the control unit triggers the safety valve 9, and the safety valve 9 closes the gas transmission pipeline 1.
Example 2:
in this embodiment, the movable unit and the control unit are further optimized and defined based on embodiment 1.
As shown in fig. 3-6, the movable unit includes an oil chamber 6 disposed in the housing 2, and a high-pressure piston 3 and a low-pressure piston 7 respectively disposed at two ends of the oil chamber 6, wherein the high-pressure piston 3 and the low-pressure piston 7 are both located between two connecting positions where the housing 2 and the gas transmission line 1 are connected in parallel; the oil cavity 6 is communicated with an external constant-pressure hydraulic source through an oil inlet pipe 5, and a ball valve 12 and an overflow valve 13 are sequentially arranged on the oil inlet pipe 5 along the direction far away from the oil cavity 6. The control unit comprises an oil return pipe 8, one end of the oil return pipe 8 is connected with a safety valve 9, the other end of the oil return pipe 8 is provided with two openings communicated with the inside of the shell 2, and the other end of the shell 2, which is in the radial direction of the joint with the oil return pipe 8, is also provided with an oil discharge pipe 4; and oil return channels 10 matched with the oil return pipe 8 and the oil discharge pipe 4 are respectively arranged on the high-pressure piston 3 and the low-pressure piston 7, and the oil return channels 10 are communicated with the oil return pipe 8 and the oil discharge pipe 4 to close the safety valve 9 by the movement of the high-pressure piston 3 or the low-pressure piston 7.
The working principle is as follows:
according to the direction in fig. 3, as shown in fig. 3, the state of the limit valve is schematically illustrated when the air pressure in the air transmission line 1 is within the range of the preset air pressure value and the limit valve is not needed to be adjusted, at this time, the oil return channels 10 in the high-pressure piston 3 and the low-pressure piston 7 are both located on the left side of the oil return pipe 8 and the oil discharge pipe 4. When the air pressure in the gas transmission pipeline 1 is higher than the preset value as shown in fig. 5, the high-pressure air pushes the high-pressure piston 3 and the low-pressure piston 7 to move towards the directions close to each other, the space of the oil cavity 6 is reduced to extrude the hydraulic oil from the oil inlet pipe 5 and the overflow valve 13 until the oil return channel 10 in the high-pressure piston 3 is aligned with the oil return pipe 8 and the oil discharge pipe 4 to form an oil return pipe 8 line, and the safety valve 9 connected with the oil return pipe 8 returns oil and closes the gas transmission pipeline 1. When the air pressure in the air transmission pipeline 1 is lower than the preset value as shown in fig. 6, the hydraulic oil pushes the low-pressure piston 7 to move rightwards, it is known that the oil return passage 10 in the low-pressure piston 7 is aligned with the oil return pipe 8 and the oil discharge pipe 4 to form an oil return pipe 8, and the safety valve 9 connected with the oil return pipe 8 returns oil and closes the air transmission pipeline 1.
It should be noted that the oil inlet pipe 5 is communicated with the constant pressure hydraulic source to keep the hydraulic oil in the oil chamber 6 to provide constant pressure for the high pressure piston 3 and the low pressure piston 7, and in order to keep the pressure constant, when the pressure in the pipeline is over-increased, the piston in the limiting valve needs to extrude the hydraulic oil out of the oil chamber 6, the hydraulic oil flows out through the ball valve and the overflow valve 13, when the pressure in the pipeline is low, the piston moves to increase the space of the oil chamber, and the external constant pressure hydraulic source delivers the hydraulic oil into the oil chamber 6 through the oil inlet pipe 5.
It is worth to be noted that when the pipeline is over-pressurized and the downhole safety valve 9 is not required to be closed, the ball valve 12 can be used for closing the oil path of the relief valve 13, so that the hydraulic oil in the oil chamber 6 cannot return, the piston cannot move, and the safety valve 9 cannot be closed.
Example 3:
in this embodiment, the movable unit and the control unit are further optimized and defined based on embodiment 1.
As shown in fig. 4-5, a limit step 14 for limiting the moving positions of the high-pressure piston 3 and the low-pressure piston 7 is provided in the housing 2, and the limit step 14 enables the high-pressure piston 3 and the low-pressure piston 7 to move farthest to a position where the oil return passage 10, the oil return pipe 8 and the oil discharge pipe 4 are communicated when the safety valve 9 is closed.
As shown in fig. 5, the right side of the high pressure piston 3 and the right side of the low pressure piston 7 are both provided with a limit step 14, and the two pistons are provided with a matching step adapted to the limit step 14, when the high pressure piston 3 moves to the right due to the overpressure of the pipeline, the high pressure piston 3 is clamped by the limit step 14 when moving to the oil return passage 10, the oil return pipe 8 and the oil discharge pipe 4 to be communicated, so as to ensure that the safety valve 9 is closed. Similarly, when the low pressure of the pipeline makes the low pressure piston 7 move to the right, the low pressure piston 7 moves to the oil return passage 10, the oil return pipe 8 and the oil discharge pipe 4 to be communicated and is clamped by the limiting step 14.
Example 4:
in this embodiment, the movable unit and the control unit are further optimized and defined based on embodiment 1.
As shown in figure 3, one side of the high-pressure piston 3, which is far away from the low-pressure piston 7, is also provided with a fixed step 11, and when the air pressure of the air transmission pipeline 1 is lower than the preset pressure, the fixed step 11 is abutted against the high-pressure piston 3. In the embodiment, the fixed step 11 is arranged on the left side of the high-pressure piston 3, when the pipeline pressure is normal, the fixed step 11 is in contact with the high-pressure piston 3, and when the pipeline is low-pressure, the high-pressure piston 3 is kept still, so that the situation that the pressure provided by the hydraulic oil in the oil cavity 6 is not enough to push the low-pressure piston 7 to move to a position where the oil return channel 10, the oil return pipe 8 and the oil discharge pipe 4 are communicated is avoided.
Example 5:
in this embodiment, the movable unit and the control unit are further optimized and defined based on embodiment 1.
As shown in fig. 2, a vent hole 15 is formed in the side wall of the housing 2 near the end where the low pressure piston 7 is provided. After the installation of the limiting valve in the application is completed, the pressure limiting range of the limiting valve needs to be set, air can be provided in the gas transmission pipeline 1 by inflating the limiting valve through the vent hole 15, and therefore hydraulic oil is added into the limiting valve to set and debug the preset pressure of the limiting valve. In the same way, the vent hole 15 is also needed to debug and test the pressure limiting range of the limit valve during the routine regular maintenance process of the limit valve. In addition, the vent 15 can prevent pressure build-up.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (6)
1. The utility model provides an integral type high-low pressure limit valve for according to the switching of gas transmission line (1) atmospheric pressure control gas transmission line (1), its characterized in that:
comprises a shell (2), and two ends of the shell are communicated with the gas transmission pipeline (1) in parallel;
the movable unit is arranged in the shell (2) and is subjected to preset pressure provided by hydraulic oil arranged in the shell (2), and the movable unit moves according to the difference value of the air pressure of the gas transmission pipeline (1) and the preset pressure;
and the control unit is connected with the movable unit and a safety valve (9) for controlling the gas transmission pipeline (1) to be opened and closed, and controls the safety valve (9) to open and close the gas transmission pipeline (1) according to the position of the movable unit.
2. The integrated high and low pressure limit valve according to claim 1, wherein: the movable unit comprises an oil cavity (6) arranged in the shell (2), and a high-pressure piston (3) and a low-pressure piston (7) which are respectively arranged at two ends of the oil cavity (6), wherein the high-pressure piston (3) and the low-pressure piston (7) are both positioned between two connecting positions where the shell (2) is communicated with the gas pipeline (1) in parallel;
the oil cavity (6) is communicated with an external constant-pressure hydraulic source through an oil inlet pipe (5), and a ball valve (12) and an overflow valve (13) are sequentially arranged on the oil inlet pipe (5) in the direction away from the oil cavity (6).
3. An integrated high and low pressure limit valve as defined in claim 2, wherein: the control unit comprises an oil return pipe (8), one end of the oil return pipe (8) is connected with a safety valve (9), the other end of the oil return pipe is provided with two openings communicated with the inside of the shell (2), and the other end of the shell (2) in the radial direction of the joint of the oil return pipe (8) and the oil discharge pipe (4) is further arranged; and oil return channels (10) matched with the oil return pipe (8) and the oil discharge pipe (4) are arranged on the high-pressure piston (3) and the low-pressure piston (7), and the oil return channels (10) are communicated with the oil return pipe (8) and the oil discharge pipe (4) to close the safety valve (9) by the movement of the high-pressure piston (3) or the low-pressure piston (7).
4. An integrated high and low pressure limit valve as defined in claim 3, wherein: be equipped with in shell (2) and be used for the restriction high pressure piston (3) and low pressure piston (7) active position's spacing step (14), when spacing step (14) made closed relief valve (9), high pressure piston (3) and low pressure piston (7) furthest moved the position of oil return passageway (10), oil return pipe (8) and oil extraction pipe (4) intercommunication.
5. An integrated high and low pressure limit valve as defined in claim 4, wherein: one side of the high-pressure piston (3) far away from the low-pressure piston (7) is further provided with a fixed step (11), and when the air pressure of the air transmission pipeline (1) is lower than the preset pressure, the fixed step (11) is abutted against the high-pressure piston (3).
6. An integrated high and low pressure limit valve as defined in claim 2, wherein: and a vent hole (15) is formed in the side wall of the shell (2) and is close to one end provided with the low-pressure piston (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120015516.9U CN214063902U (en) | 2021-01-05 | 2021-01-05 | Integrated high-low pressure limiting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120015516.9U CN214063902U (en) | 2021-01-05 | 2021-01-05 | Integrated high-low pressure limiting valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214063902U true CN214063902U (en) | 2021-08-27 |
Family
ID=77369303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120015516.9U Active CN214063902U (en) | 2021-01-05 | 2021-01-05 | Integrated high-low pressure limiting valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214063902U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455530A (en) * | 2022-01-13 | 2022-05-10 | 中国电建集团华东勘测设计研究院有限公司 | Hand-held type liquid ration adds device |
-
2021
- 2021-01-05 CN CN202120015516.9U patent/CN214063902U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114455530A (en) * | 2022-01-13 | 2022-05-10 | 中国电建集团华东勘测设计研究院有限公司 | Hand-held type liquid ration adds device |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2584205B1 (en) | Time-delay valve | |
| CN214063902U (en) | Integrated high-low pressure limiting valve | |
| CN106996469B (en) | Hand pressure relief type one-way valve | |
| CN101910698A (en) | Seal assembly for use with valves having a two-piece cage | |
| ES8701343A1 (en) | Valve assembling. | |
| CN111981168A (en) | Pilot operated safety valve | |
| CN202646808U (en) | High-pressure electromagnetic air control decompression valve | |
| CN202252188U (en) | Air-balanced pressure reducing valve | |
| CN109139947B (en) | Non-penetrating hydraulic valve piston device | |
| CN111810389A (en) | Diaphragm compressor oil pressure accompanies controlling means and control system thereof | |
| CN103383012A (en) | Check valve | |
| CN113738618B (en) | Oil pressure accompanying control system and method for diaphragm compressor | |
| CN101294628A (en) | Zero leakage balance valve system | |
| CN216278037U (en) | Piston type blocking valve | |
| CN108662208B (en) | Hydraulic control valve with symmetrical structure | |
| CN209705157U (en) | A kind of temperature-sensitive automatic pressure-balancing piston spring | |
| CN114110219B (en) | Automatic control device for high-low pressure limit valve | |
| CN202982970U (en) | Decompressor of oxygen breathing apparatus | |
| CN219176697U (en) | Leather bag damage detection system of leather bag type energy accumulator | |
| CN2606226Y (en) | Flange connecting ball check valves | |
| CN202834222U (en) | Check valve | |
| CN214404810U (en) | High-low pressure automatic flow-dividing one-way valve device | |
| CN212960042U (en) | Pilot valve structure of pilot operated safety valve | |
| CN212429879U (en) | Ultrahigh pressure sealing structure for pressure regulator | |
| CN219549647U (en) | Gate valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |