CN212377357U - Flow switching device - Google Patents
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- CN212377357U CN212377357U CN202022259860.0U CN202022259860U CN212377357U CN 212377357 U CN212377357 U CN 212377357U CN 202022259860 U CN202022259860 U CN 202022259860U CN 212377357 U CN212377357 U CN 212377357U
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Abstract
The application provides a flow switching device, includes: a valve body provided with an air inlet channel, a first air outlet channel and a second air outlet channel, wherein inlets of the first air outlet channel and the second air outlet channel are opposite to each other; the reversing mechanism is used for communicating the first air outlet channel with the air inlet channel or communicating the second air outlet channel with the air inlet channel; the linkage mechanism is connected with the reversing mechanism; and the pneumatic actuating mechanism drives the reversing mechanism to rotate through the linkage mechanism to realize the switching of the first flow channel and the second flow channel, wherein the first air outlet channel is communicated with the air inlet channel to form the first flow channel, and the second air outlet channel is communicated with the air inlet channel to form the second flow channel. The pneumatic actuating mechanism is adopted to drive the reversing mechanism to rotate through the linkage mechanism, so that the first flow channel and the second flow channel are switched, and the flow switching is conveniently and quickly carried out.
Description
Technical Field
The application relates to the technical field of natural gas gathering stations, in particular to a flow switching device.
Background
The natural gas gathering station on-site process flow switching is mainly used for shunting natural gas to a production separator pipeline or a metering separator pipeline through a tee pipe installed on an inlet pipeline.
The whole process relies on the gate valve operation at tee bend both ends to realize when the process switches among the prior art, needs the gate valve of on-the-spot manual switch tee bend pipe fitting both sides, because most gate valves adopt and force sealed, when the valve is closed promptly, will rely on external force to force the flashboard to the disk seat to guarantee the leakproofness of sealed face, consequently, need great power operation gate valve, the operation is inconvenient and time-consuming.
Therefore, a flow switching device is needed to solve the flow switching problem conveniently and quickly.
SUMMERY OF THE UTILITY MODEL
The present application is directed to overcome the drawbacks of the prior art and provide a flow switching device.
In order to achieve the purpose, the following technical scheme is adopted in the application:
a flow switching apparatus comprising:
a valve body provided with an inlet passage, a first outlet passage and a second outlet passage, wherein inlets of the first outlet passage and the second outlet passage are opposite to each other;
the reversing mechanism is used for communicating the first air outlet channel with the air inlet channel or communicating the second air outlet channel with the air inlet channel;
the linkage mechanism is connected with the reversing mechanism; and
the pneumatic actuating mechanism drives the reversing mechanism to rotate through the linkage mechanism, so that switching between a first flow channel and a second flow channel is realized, wherein the first air outlet channel is communicated with the air inlet channel to form the first flow channel, and the second air outlet channel is communicated with the air inlet channel to form the second flow channel.
Optionally, the reversing mechanism comprises:
a sealing member sealing an inlet of the first outlet channel or an inlet of the second outlet channel;
and one end of the valve rod is fixedly connected with the sealing assembly, and the other end of the valve rod is fixedly connected with the linkage mechanism.
Optionally, the reversing mechanism comprises:
a sealing member sealing an inlet of the first outlet channel or an inlet of the second outlet channel;
and one end of the valve rod is arranged in the valve body, the other end of the valve rod is fixedly connected with the linkage mechanism, and the valve rod is fixedly connected with the sealing assembly in the inner cavity of the valve body.
Optionally, the linkage mechanism comprises a first connecting piece, a transmission piece and a second connecting piece,
one end of the first connecting piece is fixedly connected with the valve rod, the other end of the first connecting piece is hinged with one end of the transmission piece, one end of the second connecting piece is hinged with the other end of the transmission piece, and the other end of the second connecting piece is fixedly connected with the pneumatic actuating mechanism.
Optionally, the seal assembly comprises:
the connecting part of the shifting fork piece is fixedly connected with the valve rod in the inner cavity of the valve body;
and the valve clack is connected with the shifting fork piece through a pin shaft.
Optionally, a pressure relief hole is arranged in a position of the valve body concentric with the valve rod.
Optionally, the pneumatic actuator is fixed outside the valve body.
Optionally, the pneumatic actuator comprises a solenoid controlled single acting pneumatic actuator.
Optionally, the pneumatic actuator comprises a solenoid controlled double acting pneumatic actuator.
Optionally, the flow switching device further includes:
the main control unit is in communication connection with the electromagnetic valve and controls the electromagnetic valve to be opened or closed by sending a control signal to the electromagnetic valve.
Optionally, the flow switching device further includes:
the travel switch is arranged in the pneumatic actuating mechanism and is in communication connection with the main control unit, and the main control unit monitors the position of the sealing assembly through the travel switch.
Optionally, a wear reduction member and a packing are disposed between the valve stem and the valve body, and a bushing including at least one O-ring is disposed between the wear reduction member and the packing.
Optionally, the packing end is provided with a packing press plate fastened to the valve body by fasteners.
The flow switching device adopts the pneumatic actuating mechanism to drive the reversing mechanism to rotate through the linkage mechanism, realizes switching of the first flow channel and the second flow channel, and realizes flow switching conveniently and quickly without large force for operating the gate valve.
Drawings
Fig. 1 is a schematic structural diagram illustrating a state of a flow switching apparatus according to an embodiment of the present application;
fig. 2 is a schematic structural diagram showing another state of the flow switching device according to the embodiment of the present application;
FIG. 3 illustrates a front view of a flow switching apparatus according to an embodiment of the present application;
FIG. 4 shows a cross-sectional top view of a flow switching device of an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating a connection relationship between a cylinder actuator and a linkage mechanism of the flow switching apparatus according to the embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating a connection relationship between a cylinder actuator and a linkage mechanism of the flow switching apparatus according to the embodiment of the present disclosure;
FIG. 7 is a schematic diagram illustrating a linkage mechanism of the process switching apparatus according to an embodiment of the present application;
fig. 8 shows an enlarged view of the seal structure of the flow switching device of the embodiment of the present application.
Reference numerals
100-flow switching device, 11-valve body, 12-reversing mechanism, 13-linkage mechanism, 14-pneumatic actuator, 104-air inlet channel, 105-first air outlet channel, 106-second air outlet channel, 107-upper valve seat, 108-lower valve seat, 109-valve cover, 110-key, 111-pressure relief hole, 112-transition connecting flange, 121-sealing component and 122-valve rod, 1211-shifting fork piece, 1212-valve clack, 131-first connecting piece, 132-transmission piece, 133-second connecting piece, 141-piston, 142-spring, 201-antifriction piece, 202-O-shaped sealing ring, 203-bushing, 204-packing, 205-packing, 206-packing pad, 207-packing press sleeve and 208-packing press plate.
Detailed Description
The following description of specific embodiments of the present application refers to the accompanying drawings.
In this document, "upper", "lower", "front", "rear", "left", "right", and the like are used only to indicate relative positional relationships between relevant portions, and do not limit absolute positions of the relevant portions.
In this document, "first", "second", and the like are used only for distinguishing one from another, and do not indicate the degree and order of importance, the premise that each other exists, and the like.
In this context, "equal", "same", etc. are not strictly mathematical and/or geometric limitations, but also include tolerances as would be understood by a person skilled in the art and allowed for manufacturing or use, etc.
Unless otherwise indicated, numerical ranges herein include not only the entire range within its two endpoints, but also several sub-ranges subsumed therein.
Example one
As shown in fig. 1 to 4, the flow switching apparatus 100 of the present embodiment includes: a valve body 11 provided with an inlet passage 104, a first outlet passage 105, and a second outlet passage 106, wherein inlets of the first outlet passage 105 and the second outlet passage 106 are opposite to each other; a reversing mechanism 12, wherein the reversing mechanism 12 communicates the first air outlet channel 105 with the air inlet channel 104, or communicates the second air outlet channel 106 with the air inlet channel 104; the linkage mechanism 13 is connected with the reversing mechanism 12; and the pneumatic actuator 14 drives the reversing mechanism 12 to rotate through the linkage mechanism 13, so that switching between a first flow channel and a second flow channel is realized, wherein the first air outlet channel 105 is communicated with the air inlet channel 104 to form the first flow channel, and the second air outlet channel 106 is communicated with the air inlet channel 104 to form the second flow channel.
The valve body 11 is a three-way valve body, the flow channel of the valve body can be in an angle structure, the left lateral channel is an air inlet channel 104, the upward flow channel is a first air outlet channel 105 for production, the downward flow channel is a second air outlet channel 106 for metering, or the upward flow channel is the first air outlet channel 105 for metering, and the downward flow channel is the second air outlet channel 106 for production. The inlets of first outlet channel 105 and second outlet channel 106 are opposite to each other, and natural gas enters from the inlet, flows through inlet channel 104 and enters into first outlet channel 105 or second outlet channel 106.
One end of the reversing mechanism 12 seals the first air outlet channel 105 or the second air outlet channel 106, and the other end passes through the valve body 11 and is connected with the linkage mechanism 13, and the reversing mechanism 12 can adopt an integrated structure or a split structure. The upper valve seat 107 at the first air outlet channel 105 and the lower valve seat 108 at the second air outlet channel 106 can cooperate with the reversing mechanism 12 to seal the air outlet channel, for example, the valve seat plane at the air outlet channel is in a form of one side being low and the other side being high as shown in fig. 1, so as to form a plane seal with the reversing mechanism 12, of course, those skilled in the art can understand that the reversing mechanism 12 can be sealed with the valve seat at the air outlet channel by using a plane seal, a spherical seal, a conical seal, etc., as long as the sealing between the reversing mechanism 12 and the valve seat at the air outlet channel can be realized. In an alternative embodiment, the contact position of the reversing mechanism 12 and the valve seat is sprayed and welded with wear-resistant and scouring-resistant alloy materials, so that the service life of the valve can be greatly prolonged. In an alternative embodiment, the valve body 11 is a one-piece structure, and the outlet channel is connected to a production or metering line pipeline. In another embodiment, the valve body 11 is a split structure, and transition connecting flanges 112 are arranged on the upper part and the lower part of the valve body, and are connected with a production or metering pipeline through the transition connecting flanges 112.
One end of the linkage mechanism 13 is connected with the reversing mechanism 12, and the other end is connected with the pneumatic actuator 14, so that the reversing mechanism 12 is driven to rotate under the action of the pneumatic actuator 14, and the switching between the first flow channel and the second flow channel is realized. The flow switching device 100 utilizes the pneumatic actuator 14 to drive the linkage mechanism 13 to rotate the reversing mechanism 12, so as to realize flow switching, and ensure that gas enters the production pipeline only through the first gas outlet channel 105 or enters the metering pipeline through the second gas outlet channel 106 under normal conditions. Preferably, the pneumatic actuator 14 is fixed to the outside of the valve body 11, the pneumatic actuator 14 as a power source of the driving device is disposed outside the valve body 11 and fixed to the outside of the valve body 11, and the link mechanism 13 is also disposed outside the valve body accordingly, so that the operation of the pneumatic actuator 14 is simple. In addition, the valve cover 109 of the flow switching device 100 can be side-mounted, so that the internal components can be replaced conveniently.
Fig. 1 is a schematic structural diagram illustrating a state of a flow switching apparatus 100 according to an embodiment of the present disclosure, where as shown in fig. 1, an inlet of a first air outlet channel 105 is sealed by a reversing mechanism 12, and a second flow channel formed by communicating a second air outlet channel 106 with an air inlet channel 104 is opened. For clarity, fig. 2 is a schematic diagram illustrating another state of the flow switching device 100 according to the embodiment of the present application, and as shown in fig. 2, the reversing mechanism 102 seals the inlet of the second air outlet channel 106, and the first flow channel formed by the communication between the first air outlet channel 105 and the air inlet channel 104 is opened.
In practical application, the flow switching device 100 may be installed at a tee joint of a natural gas throttling master, so as to ensure that natural gas only enters a production separator for gas-liquid separation or enters a metering separator for separation and metering. In addition, the structural dimension of the flow switching device 100 can be the same as the dimension between the gate valves to be reconstructed on site, and the reconstruction workload is reduced.
According to the flow switching device of the embodiment, the pneumatic actuating mechanism is adopted to drive the reversing mechanism to rotate through the linkage mechanism, so that the first flow channel and the second flow channel are switched, and the flow switching is conveniently and quickly carried out.
In one embodiment of the present disclosure, the reversing mechanism 12 is a split structure, and includes a sealing assembly 121 and a valve rod 122, the sealing assembly 121 seals an inlet of the first air outlet channel 105 or an inlet of the second air outlet channel 106, and one end of the valve rod 122 is fixedly connected to the sealing assembly 121, and the other end is fixedly connected to the linkage mechanism 13. In this embodiment, the valve stem 122 and the sealing assembly 121 may be fixedly connected through a connecting sleeve and a screw nut, or may be fixedly connected through the key groove provided on the valve stem 122 and the key 110 and the sealing assembly 121, which is not particularly limited in this application.
In another embodiment, as shown in fig. 3 to 4, the reversing mechanism 12 is a split structure, and includes a sealing assembly 121 and a valve rod 122, where the sealing assembly 121 seals an inlet of the first air outlet channel 105 or an inlet of the second air outlet channel 106; one end of the valve rod 122 is disposed in the valve body 11, the other end is fixedly connected to the linkage mechanism 13, and the valve rod 122 is fixedly connected to the sealing assembly 121 in the inner cavity of the valve body. In this embodiment, the valve stem 122 may be fixedly connected to the sealing assembly 121 through a key groove at a position in the inner cavity of the valve body as shown in fig. 4, or through a through hole at the position, a fastener such as a screw nut, etc., and the present application is not limited thereto. Optionally, a relief hole 111 is provided in the valve body 11 at a position concentric with the valve stem 122. When the inner cavity of the valve body is over-pressurized, the pressure in the inner cavity of the valve body can be automatically released, and the protection effect is achieved.
In one particular implementation, seal assembly 121 includes: a shifting fork 1211, wherein the connecting part of the shifting fork 1211 is fixedly connected with the valve rod 122 in the inner cavity of the valve body; the valve flap 1212 and the valve flap 1212 are connected to the fork 1211 via a pin. Specifically, the pin may be a hinge pin. The shifting fork 1211 and the valve flap 1212 form a sealing assembly, which is reliable in sealing and flexible in operation.
In one embodiment, as shown in fig. 4, the linkage 13 includes a first connecting member 131, a transmission member 132, and a second connecting member 133, wherein one end of the first connecting member 131 is fixedly connected to the valve stem 122, the other end thereof is hinged to one end of the transmission member 132, one end of the second connecting member 133 is hinged to the other end of the transmission member 132, and the other end of the second connecting member 133 is fixedly connected to the pneumatic actuator 14. In a specific implementation manner, as shown in fig. 5 to 6, the third connecting element 133 is implemented by using a connecting frame, where the cylinder actuator 14 is connected to the connecting frame by an external thread, and the bottom of the connecting frame is provided with an internal thread and then fixed by a nut, or the cylinder actuator 14 is provided with an internal thread and the bottom of the connecting frame is provided with an external thread, and those skilled in the art can understand that any manner that can implement the connection between the cylinder actuator 14 and the connecting frame can be used. In another implementation, the second connector 133 may not be used, and the transmission member 132 may be directly connected to the pneumatic actuator 14. Fig. 7 shows a schematic view of the linkage 13 according to an embodiment of the present application.
In one embodiment, the pneumatic actuator 14 is a single-acting pneumatic actuator controlled by a solenoid valve, as shown in fig. 3 to 6, when the solenoid valve is energized, the air source enters the pneumatic actuator 14 from the air inlet of the pneumatic actuator 14, pushes the piston 141 to move upward, compresses the spring 142, and then pushes the second connecting member 133 to move upward, and drives the valve rod 122 and the sealing assembly 121 to rotate through the transmission member 132 and the first connecting member 131, when the maximum stroke of the piston 141 is reached, the sealing assembly 121 forms a seal with the upper valve seat 107, the first flow passage is closed, and the second flow passage is opened; when the electromagnetic valve is powered off, the gas source is closed, the spring 142 resets, the piston 141 moves downwards, the second connecting piece 133 is pulled to move downwards, the valve rod 122 and the sealing assembly 121 are driven to rotate through the transmission piece 132 and the first connecting piece 131, when the spring 142 completely resets, the sealing assembly 121 and the lower valve seat form sealing, the first flow channel is opened, and the second flow channel is closed, so that flow channel switching is realized. The position of the air inlet of the pneumatic actuator 14 may be located at any position on the frame of the pneumatic actuator 14 below the piston 141 as shown in fig. 3, or at any position on the lower frame or side frame below the piston 141.
The single-action pneumatic actuator closes the first flow channel under the condition of gas source gas switching-on, and leans on the spring 142 automatic re-setting under the condition of gas source gas closing to make the first flow channel open, and because can adopt automatic re-setting, adopt an air inlet input gas source can, assembly and operation are all simple convenient. In addition, the output torque is stable, and the closing or opening of the valve is stable and timely under the fault condition.
In this embodiment, according to on-the-spot operating mode most of time natural gas gets into the production separator and produces, the solenoid valve adopts normal close type solenoid valve, and natural gas flow direction measures the separator during the circular telegram, and natural gas flow direction produces the separator during outage to greatly reduced the switching frequency of solenoid valve, improved solenoid valve life and reduced the energy consumption.
The single-acting pneumatic actuator in this embodiment is merely an example and not a limitation of this specification, and in another embodiment, the pneumatic actuator 14 may adopt the following double-acting structure: in the structure, a spring is not adopted, the upper side and the lower side of the framework of the pneumatic actuator 14 are respectively provided with an air inlet, when the air inlet below the piston 141 is opened, the piston 141 moves upwards to push the second connecting piece 133 to move upwards, the valve rod 122 and the sealing component 121 are driven to rotate by the transmission piece 132 and the first connecting piece 131, when the maximum stroke of the piston 141 is reached, the sealing component 121 and the upper valve seat form sealing, the first flow passage is closed, and the second flow passage is opened; when the air inlet above the piston 141 is opened and the air inlet below the piston 141 is closed, the piston 141 moves downwards, the second connecting piece 133 is pulled to move downwards, the valve rod 122 and the sealing assembly 121 are driven to rotate by the transmission piece 132 and the first connecting piece 131, when the maximum stroke of the piston 141 is reached, the sealing assembly 121 and the lower valve seat form sealing, the first flow passage is opened, and the second flow passage is closed.
Example two
The flow switching device of this embodiment adopts the same structure as that of the first embodiment, and is not described again, but the difference is that the flow switching device of this embodiment further includes a main control unit, and the main control unit is in communication connection with the electromagnetic valve, and controls the electromagnetic valve to open or close by sending a control signal to the electromagnetic valve, thereby controlling the flow channel switching.
The main control unit is in remote communication connection with the electromagnetic valve or controls the electromagnetic valve through the electromagnetic valve control line, and sends a control signal to the electromagnetic valve to control the electromagnetic valve to be opened or closed so as to control the pneumatic actuating mechanism to move, thereby controlling the flow channel to be switched. The main control unit can also collect information related to the natural gas entering the metering separator and the production separator through a metering position signal collecting line and a production position signal collecting line. In addition, the main control unit can be connected to a well site upper computer, remote control pipeline switching is achieved, manual operation is not needed when people go to a production field to achieve operation such as pipeline flow switching and emptying in the gas gathering station, labor intensity and labor cost are reduced, especially, the situation that pipeline freezing and blocking frequency is increased to achieve manual flow switching and emptying operation frequency is increased under the condition that the alcohol injection effect is poor in winter is achieved, operation labor intensity is greatly reduced, blocking timeliness is improved, remote start-stop control is achieved finally, unattended operation mode in the station is completed, manual labor intensity is effectively reduced, operation frequency is reduced, and production efficiency of a gas well is improved.
In an optional embodiment, the flow switching apparatus further includes:
the travel switch is arranged in the pneumatic actuating mechanism and is in communication connection with the main control unit, and the main control unit monitors the position of the sealing assembly through the travel switch.
In a specific implementation manner, for example, two travel switches may be installed on upper and lower sides of a pneumatic actuator, and used to determine whether a specific component (e.g., a piston) in the pneumatic actuator reaches a specific position on the upper side and the lower side, and the main control unit may monitor the position of the reversing mechanism through the travel switches, so as to implement remote precise control of flow channel switching.
In addition, in order to avoid gas leakage, an antifriction part 201 and a filler are arranged between the valve rod and the valve body, and a bushing 203 comprising at least one O-shaped sealing ring 202 is arranged between the antifriction part 201 and the filler, preferably, the antifriction part 201 is an antifriction sleeve, so that impurities in natural gas, such as sand, water and the like, can be prevented from entering a sealing cavity, and metal friction between the outer diameter of the valve rod and the inner cavity of the filler of the valve body when the cylinder reciprocates is eliminated. Fig. 8 shows an enlarged view of the sealing structure of the flow switching device 100 shown in fig. 4. As shown in fig. 8, a bushing 203 is disposed between the wear reducing member 201 and the filler, the bushing 203 includes at least one O-ring 202, and the bushing 203 may be made of an austenitic stainless steel material. Preferably, two O-rings 202 are provided. The number of O-rings shown in fig. 8 is merely an example, and does not specifically limit the present specification.
The filler can be two or more V-shaped fillers made of polytetrafluoroethylene, such as the fillers 204 and 205 in FIG. 8, and the filler has good self-sealing effect in a free state, good sealing performance and capability of eliminating a certain impact load. In addition, the end part of the packing is provided with a packing pressure plate 208, the packing pressure plate 208 is fastened to the valve body through a fastening piece, the tightness of the fastening piece is adjusted to improve the sealing performance, and natural gas can be prevented from leaking. Optionally, a packing pad 206 and a packing pressing sleeve 207 are arranged between the end of the packing and the packing pressing plate. By adopting the multiple sealing structure, the sealing result is good, and the natural gas can be effectively prevented from leaking.
The above exemplary materials are not intended to limit the flow switching device 100, and the materials may be selected according to the usage.
The preferred embodiments and examples of the present application have been described in detail with reference to the accompanying drawings, but the present application is not limited to the embodiments and examples described above, and various changes can be made within the knowledge of those skilled in the art without departing from the concept of the present application.
Claims (13)
1. A flow switching apparatus (100), comprising:
a valve body (11) provided with an inlet passage (104), a first outlet passage (105) and a second outlet passage (106), wherein inlets of the first outlet passage (105) and the second outlet passage (106) are opposite to each other;
a reversing mechanism (12), wherein the reversing mechanism (12) is used for communicating the first air outlet channel (105) with the air inlet channel (104) or communicating the second air outlet channel (106) with the air inlet channel (104);
the linkage mechanism (13), the said linkage mechanism (13) is connected with the said reversing mechanism (12); and
the pneumatic actuator (14) drives the reversing mechanism (12) to rotate through the linkage mechanism (13), so that switching between a first flow channel and a second flow channel is realized, wherein the first air outlet channel (105) is communicated with the air inlet channel (104) to form the first flow channel, and the second air outlet channel (106) is communicated with the air inlet channel (104) to form the second flow channel.
2. The process switching apparatus according to claim 1, wherein the reversing mechanism comprises:
a sealing member (121), the sealing member (121) sealing an inlet of the first outlet channel (105) or an inlet of the second outlet channel (106);
and one end of the valve rod (122) is fixedly connected with the sealing assembly (121), and the other end of the valve rod (122) is fixedly connected with the linkage mechanism (13).
3. The process switching apparatus according to claim 1, wherein the reversing mechanism comprises:
a sealing member (121), the sealing member (121) sealing an inlet of the first outlet channel (105) or an inlet of the second outlet channel (106);
one end of the valve rod (122) is arranged in the valve body (11), the other end of the valve rod (122) is fixedly connected with the linkage mechanism (13), and the valve rod (122) is fixedly connected with the sealing assembly (121) in the inner cavity of the valve body.
4. Process switching device according to claim 2 or 3, wherein the linkage comprises a first connection member (131), a transmission member (132) and a second connection member (133), wherein:
one end of the first connecting piece (131) is fixedly connected with the valve rod (122), and the other end of the first connecting piece is hinged with one end of the transmission piece (132); one end of the second connecting piece (133) is hinged with the other end of the transmission piece (132), and the other end of the second connecting piece (133) is fixedly connected with the pneumatic actuating mechanism (14).
5. The process switching device according to claim 3, wherein said sealing member comprises:
a shifting fork piece (1211), wherein the connecting part of the shifting fork piece (1211) is fixedly connected with the valve rod (122) in the inner cavity of the valve body;
the valve flap (1212) is connected with the shifting fork piece (1211) through a pin shaft.
6. The process switching device according to claim 3, wherein a relief hole (111) is provided in a position of the valve body (11) concentric with the valve stem (122).
7. Flow switching device according to claim 1 or 2, characterized in that the pneumatic actuator (14) is fixed outside the valve body (11).
8. Process switching device according to claim 4, characterized in that the pneumatic actuator (14) comprises a solenoid-controlled single-acting pneumatic actuator.
9. Process switching device according to claim 4, characterized in that the pneumatic actuator (14) comprises a solenoid-controlled double-acting pneumatic actuator.
10. The flow switching device according to claim 8 or 9, further comprising:
the main control unit is in communication connection with the electromagnetic valve and controls the electromagnetic valve to be opened or closed by sending a control signal to the electromagnetic valve.
11. The flow switching apparatus according to claim 10, further comprising:
a travel switch disposed in the pneumatic actuator (14) and communicatively connected to the master control unit, the master control unit monitoring a position of the seal assembly (121) via the travel switch.
12. Procedure switching device according to claim 2 or 3, characterised in that a wear reducing member (201) and a packing are arranged between the valve stem (122) and the valve body (11), and that a bushing (203) comprising at least one O-ring (202) is arranged between the wear reducing member (201) and the packing.
13. Process switching device according to claim 12, characterized in that the packing end is provided with a packing press plate (208), the packing press plate (208) being fastened to the valve body (11) by means of fasteners.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022259860.0U CN212377357U (en) | 2020-10-14 | 2020-10-14 | Flow switching device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022259860.0U CN212377357U (en) | 2020-10-14 | 2020-10-14 | Flow switching device |
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| Publication Number | Publication Date |
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| CN212377357U true CN212377357U (en) | 2021-01-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022259860.0U Active CN212377357U (en) | 2020-10-14 | 2020-10-14 | Flow switching device |
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| CN (1) | CN212377357U (en) |
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