Selector valve and pneumatic control valve control system

Abstract

The utility model discloses a selector valve and pneumatic control valve control system. The system comprises a first pneumatic control valve and a gas display device which are arranged on a first gas path, a second pneumatic control valve and a manual valve which are arranged on a second gas path connected with the first gas path in parallel, and a selector valve connected with the first gas path and the second gas path, the first pneumatic control valve is used for controlling on-off of gas on the first gas path, and the second pneumatic control valve is used for controlling on-off of gas on the second gas path; the gas display device is used for displaying the on-off state of gas in the first gas path; the manual valve is used for controlling the connection and disconnection of the second gas path; and the selector valve is used for outputting the gas in the gas path to the execution element. Faults of the pneumatic control valve can be found in time, meanwhile, it can be guaranteed that air paths are switched when the valve breaks down, and the problem that an execution element stops acting when the valve breaks down is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to pneumatic control technical field, especially a selection valve, pneumatic control valve control system. BACKGROUND

[0002] With the continuous development of industrial technology, the valve as a control element plays a very important role in the industrial automation field. The electromagnetic force / spring / compressed air is used to switch the valve core position, control the flow direction of fluid, gas, liquid and other media, and then achieve the purpose of controlling the execution element. Therefore, the valve is widely used in various industrial automation. The industries represented by petroleum, chemical industry, coal mine and the like are generally characterized by poor gas source environment, high temperature, high pressure or flammable and explosive characteristics. Once the valve fails and cannot be replaced in time, the execution element will malfunction and accidents may occur, which may cause disastrous consequences.

[0003] In the commonly used pneumatic control system, the pneumatic control circuit is a single linear circuit, that is, the gas at the gas source first reaches the pneumatic control valve, and then reaches the execution element through the pneumatic control valve. In this circuit, if the valve core is stuck due to impurities, the valve core seal is poor, or there is leakage, the pressure will be reduced or there will be no flow output, and a new valve needs to be replaced. The total gas inlet or the gas inlet at the bad valve position needs to be closed, and then the valve needs to be replaced. Such operation of the corresponding execution element can only be stopped at the same time until the repair is completed. UTILITY MODEL CONTENTS

[0004] In the existing pneumatic control system, when the valve fails, it is inconvenient to replace and the replacement of the valve will affect the operation of the execution element. In addition, the valve in this system is not easy to be discovered in time when it fails. If the bad valve is not discovered in time, it is very easy to cause accidents.

[0005] In view of the above problems, the utility model is proposed to provide a selection valve and a pneumatic control valve control system to overcome the above problems or at least partially solve the above problems.

[0006] In the first aspect, the utility model embodiment provides a selection valve, which comprises a main body, a left connector, a right connector, a valve core and a sealing gasket.

[0007] The main body is provided with a gas outlet and a hollow channel communicated with the gas outlet, and the left connector and the right connector are connected with two ends of the hollow channel respectively.

[0008] The connector is provided with a groove and a gas inlet, and the outer wall of the groove is provided with a gas port communicated with the gas outlet.

[0009] The valve core is provided with sealing pads at two ends, and the two ends of the valve core are embedded in grooves of the left joint and the right joint respectively, and the sealing pads are used for sealing the gas inlets; the valve core can slide in the grooves to block the gas inlet of one joint under the action of the gas pressure difference generated by the two gas inlets of the two joints.

[0010] In some optional embodiments, the selection valve further comprises: sealing rings arranged on both sides of the hollow channel of the main body, and the sealing rings are used for sealing the main body and the joints; the joints are threadedly connected with the hollow channel of the main body.

[0011] In some optional embodiments, the valve core comprises: a first cylindrical segment, a second cylindrical segment and a third cylindrical segment connected in sequence, the diameters of the first cylindrical segment and the third cylindrical segment are greater than the diameter of the second cylindrical segment, and the lengths of the first cylindrical segment and the third cylindrical segment are less than the length of the second cylindrical segment.

[0012] The third cylindrical segment is provided with a circular arc chamfer at one end connected with the second cylindrical segment, and is provided with a sealing pad at the other end not connected with the second cylindrical segment, and the first cylindrical segment is provided with a sealing pad at one end not connected with the second cylindrical segment.

[0013] The third cylindrical segment of the valve core is embedded in the groove of the right joint, and the first cylindrical segment is embedded in the groove of the left joint, and the diameters of the first cylindrical segment and the third cylindrical segment match the diameter of the groove of the joint.

[0014] In some optional embodiments, the sliding distance of the valve core is less than the depth of the groove, and in the case that the sealing pad of the valve core blocks the gas inlet of one joint, the gas inlets of the other joint, the outer wall of the groove and the gas outlet of the main body are in communication.

[0015] In the second aspect, the utility model embodiment provides a kind of pneumatic control valve control system, comprising: first pneumatic control valve and gas display device being arranged on first gas path, second pneumatic control valve and manual valve being arranged on second gas path connected with first gas path in parallel, and selection valve connected with first gas path and second gas path;

[0016] The first pneumatic control valve is used to control the gas on-off of first gas path, and the second pneumatic control valve is used to control the gas on-off of second gas path.

[0017] The gas display device is used to display the on-off state of the gas in first gas path.

[0018] The manual valve is used to control the on-off of second gas path.

[0019] The selection valve is used to output the gas in gas path to execution element, and the selection valve is the selection valve described above.

[0020] In some optional embodiments, the first gas path is connected with the right joint of the selection valve.

[0021] In some alternative embodiments, the first gas control valve on the first gas path and the second gas control valve on the second gas path are provided with an air inlet and a pilot gas inlet;

[0022] The air inlet is used to introduce the gas from the external source into the first gas path and / or the second gas path, and the pilot gas inlet is used to introduce the pilot gas into the first gas control valve and the second gas control valve.

[0023] In some alternative embodiments, the first gas control valve and the second gas control valve further comprise a pluggable self-sealing joint.

[0024] When the self-sealing joint is plugged, the gas passing through the first gas control valve and / or the second gas control valve is blocked.

[0025] When the self-sealing joint is unplugged, the gas passing through the first gas control valve and / or the second gas control valve is allowed to flow.

[0026] In some alternative embodiments, a gas display device is arranged between the selector valve and the first gas control valve.

[0027] When the gas in the first gas path passes through the first gas control valve and the pressure of the gas is greater than the preset pressure, the gas display device is turned on.

[0028] When the gas in the first gas path passes through the first gas control valve and the pressure of the gas is less than the preset pressure, the gas display device is turned off.

[0029] In some alternative embodiments, the manual valve is a normally open valve and is arranged between the second gas control valve and the selector valve.

[0030] When the second gas path is blocked, the manual valve is in a closed state.

[0031] The beneficial effects of the above technical solutions provided by the embodiments of the utility model at least include:

[0032] The selector valve provided by the embodiments of the utility model comprises a main body, two joints, a valve core and a sealing gasket, the main body is provided with an air outlet, the main body is in sealing connection with the joints, the joints are provided with grooves and air inlets, the outer side wall of the groove is provided with an air port, the air port is in communication with the air outlet, the valve core is provided with the sealing gaskets at both ends, the valve core is embedded in the groove of the joint, and the valve core can slide in the groove and block one air inlet through the sealing gasket under the action of the gas pressure difference generated by the two air inlets of the two joints. The valve core of the selector valve can slide left and right in the groove of the joint under the action of the gas pressure difference, thereby one air inlet is blocked and the other air inlet is supplied with gas, the gas is output to the air outlet through the air port of the outer side wall of the groove, when the valve needs to be replaced due to failure, the valve core can automatically switch the blocking direction, at least one gas path in the gas path can be normally supplied with gas, so that the actuating element can normally act.

[0033] The pneumatic valve control system provided in this embodiment includes: a first pneumatic valve and a gas display device disposed on a first gas path; a second pneumatic valve and a manual valve disposed on a second gas path connected in parallel with the first gas path; and a selection valve connected to the first and second gas paths. The first pneumatic valve is used to control the on / off state of the gas in the first gas path, and the second pneumatic valve is used to control the on / off state of the gas in the second gas path. The gas display device is used to display the on / off state of the gas in the first gas path. The manual valve is used to control the on / off state of the second gas path. The selection valve is used to output the gas in the gas path to the actuator. The selection valve is the selection valve in this embodiment of the present invention. This system can control the opening and closing of the second gas path under the manual valve control. If the first gas path malfunctions and cannot supply gas, the selector valve automatically switches the gas path to ensure normal gas supply to the second gas path, guaranteeing the normal operation of the actuators. Simultaneously, a gas display device can promptly detect whether the first gas control valve has malfunctioned, allowing for timely replacement of the faulty valve. The system can automatically switch gas paths in case of abnormal gas pressure; the lighting and extinguishing of the gas display device also alerts to gas path abnormalities. This comprehensive protection ensures normal gas supply and prevents actuator malfunction. The gas control valve control system provided in this embodiment is simple to operate, can be applied in flammable and explosive environments, and automatically switches to another valve when one valve fails, without affecting the operation of the actuators. Maintenance does not require system shutdown.

[0034] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention may be realized and obtained by means of the structures particularly pointed out in the written description, claims, and drawings.

[0035] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a front view of the valve selected in an embodiment of this utility model;

[0038] Figure 2 This is a schematic diagram of the structure of the pneumatic valve control system in an embodiment of this utility model;

[0039] Figure 3 This is a schematic diagram showing the force distribution on the valve in an embodiment of this utility model;

[0040] In the attached diagram:

[0041] 1-body, 2-joint, 3-valve core, 4-seal ring, 5-seal pad. DETAILED DESCRIPTION

[0042] Exemplary embodiments of the present disclosure will be described in greater detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that the present disclosure can be more thoroughly understood and the scope of the present disclosure can be accurately conveyed to those skilled in the art.

[0043] In order to solve the problem that the air control valve cannot be found in time when it fails in the prior art and the operation of the execution element is affected when the air control valve is replaced, the utility model embodiment provides a selector valve and an air control valve control system.

[0044] The utility model embodiment provides a selector valve, the front view of the selector valve refers to Figure 1 As shown in the figure, comprising: main body 1, joint 2, valve core 3 and seal pad 5, main body is equipped with gas outlet and hollow channel that communicates with gas outlet, joint is divided into left joint and right joint, left joint and right joint are connected with both ends of hollow channel respectively, here described'left'and'right'refer to the relative relationship on structure, in actual use, joint can be in different orientation. From Figure 1 As can be seen from the figure, the hollow channel includes left joint, valve core and right joint connected in sequence from left to right, one end of left and right joints respectively extends into the hollow channel, the valve core is embedded in the groove of left and right joints and can slide in the groove, the sliding distance of the valve core is less than the depth of the groove, so that the valve core will not fall off when sliding left and right.

[0045] The joint is provided with a groove and an air inlet, and the outer wall of the groove is provided with an air port, which communicates with the air outlet. Figure 1 The left air port and the right air port are both air ports, and the left air inlet and the right air inlet are both air inlets.

[0046] The valve core is provided with a seal pad 5 at both ends, and the two ends of the valve core are embedded in the grooves of the left joint and the right joint respectively, and the seal pad is used for sealing the air inlet; under the action of the gas pressure difference generated by the two air inlets of the two joints, the valve core can slide in the groove to block the air inlet of one joint.

[0047] Optionally, the above-mentioned selector valve further comprises: a seal ring 4 arranged on both sides of the hollow channel of the main body, the seal ring is used for sealing the main body and the joint; the joint is threadedly connected with the hollow channel of the main body, so that the joint and the main body are matched to ensure the sealing property of the selector valve.

[0048] Optionally, the valve core comprises a first cylindrical section, a second cylindrical section and a third cylindrical section connected in sequence, the diameters of the first cylindrical section and the third cylindrical section are greater than the diameter of the second cylindrical section, and the heights of the first cylindrical section and the third cylindrical section are less than the height of the second cylindrical section; the end of the third cylindrical section connected with the second cylindrical section is provided with a circular arc chamfer, and the end of the third cylindrical section not connected with the second cylindrical section is provided with a sealing gasket, and the end of the first cylindrical section not connected with the second cylindrical section is provided with a sealing gasket; the third cylindrical section of the valve core is embedded in the groove of the right joint, and the first cylindrical section is embedded in the groove of the left joint, and the diameters of the first cylindrical section and the third cylindrical section match the diameter of the joint groove.

[0049] Optionally, in the case that the sealing gasket of the valve core blocks the gas inlet of a joint, the gas inlet of the joint, the gas port of the groove outer wall and the gas outlet of the main body are communicated.

[0050] The valve core slides in the groove of the joint under the action of the pressure difference generated by the valve core at the gas inlet of the joint, if the gas pressure on the left is greater than the gas pressure on the right, the valve core slides to the groove of the right joint under the pressure difference, so as to block the left gas inlet through the sealing gasket, and the gas of the left gas inlet is output to the gas outlet through the gas port of the groove outer wall of the corresponding joint; if the gas pressure on the left is less than the gas pressure on the right, the valve core slides to the groove of the left joint under the pressure difference, so as to block the right gas inlet through the sealing gasket, and the gas of the right gas inlet is output to the gas outlet through the gas port of the groove outer wall of the corresponding joint. The third cylindrical section of the valve core is provided with a circular arc chamfer, and the chamfer is arranged to change the force direction of the gas and ensure that the valve core has better sealing effect on the left gas inlet of the joint, so that the valve core does not slide randomly in the grooves of the two joints during work.

[0051] The utility model embodiment further provides a kind of pneumatic control valve control system, its structural schematic diagram refers to Figure 2 As shown in the figure, comprising: first pneumatic control valve and gas display device being arranged on first gas path, second pneumatic control valve and hand valve being arranged on second gas path being connected in parallel with first gas path, and selection valve being connected with first gas path and second gas path.

[0052] First pneumatic control valve is used to control the gas on-off of first gas path, second pneumatic control valve is used to control the gas on-off of second gas path;Gas display device is used to show the on-off state of the gas in first gas path.

[0053] Hand valve is used to control the on-off of second gas path;Hand valve is normally open hand valve, i.e. in non-working process, hand valve is in open state.

[0054] Selection valve is used to output the gas in gas path to execution element, and selection valve is the above-mentioned selection valve provided by the embodiment of the application.

[0055] Optionally, the first air path is connected to the right connector of the selector valve.

[0056] Optionally, the manual valve is a normally open valve, located between the second pneumatic control valve and the selector valve; the manual valve is closed when the second pneumatic path is blocked.

[0057] See Figure 2 As shown, the above-mentioned pneumatic valve control system performs the following actions during operation;

[0058] Action 1: Press the manual valve to put it in the de-ventilated state;

[0059] Since the manual valve is a normally open manual valve, pressing the manual valve switches it to a non-ventilated state, blocking the second air passage.

[0060] Action 2: Supply air from the air source and open the first and second air control valves;

[0061] After the gas source supplies gas, the gas flows into the first gas path and the second gas path. In this state, because the manual valve is in the blocked state, the gas in the first gas path can flow smoothly. When the gas pressure is greater than the preset pressure, the indicator light of the gas display device lights up. Meanwhile, the gas in the second gas path is blocked, and the gas in the second gas path will not flow to the selector valve. There is gas pressure on the right connector of the selector valve and no gas pressure on the left, which creates a gas pressure difference. Under the action of the pressure difference, the valve core of the selector valve slides into the groove of the left connector and seals the air inlet of the left connector through the sealing gasket.

[0062] Action 3: Press the manual valve to put it in the venting state.

[0063] Press the manual valve again. The manual valve switches to the venting state, and the gas in the second air path flows to the air inlet of the left connector of the selector valve. At this time, the first and second air paths simultaneously supply gas to the selector valve. Since the air inlet on the left side of the selector valve is blocked by the valve core, only the gas in the first air path can pass through the selector valve. The gas in the first air path reaches the air outlet through the air port on the outer wall of the groove of the right connector and is output to the actuator. The actuator operates normally. See the gas flow direction. Figure 2 The red line indicates this.

[0064] Figure 3 This diagram illustrates the forces acting on the valve core during operation. After the valve core is blown into the groove of the left connector, it blocks the air inlet of the left connector. Once the gas in the second air path successfully passes through and reaches the left connector, although there is gas pressure on the left side, the force-bearing area on the right side of the valve core is greater than that on the left. Therefore, the valve core will still block the air inlet on the left. Simultaneously, the gas entering from the right side will exert an outward pushing force on both sides of the interior. (See diagram). Figure 3At the position indicated by the left arrow of the valve core, the left side pressure is ensured to be tighter, and the force area of the left side of the valve core is small. Even if a small amount of gas in the second gas path enters the communication between the gas inlet and the gas outlet through the sealing gasket, due to the fact that the third cylindrical section of the valve core is provided with a circular arc chamfer, the third cylindrical section is connected with the right joint, and the right joint is connected with the first gas path, the stress direction of the gas is changed under the action of the chamfer. Referring to Figure 3 At the position indicated by the right arrow of the valve core, the pressure of the right side gas is still greater than that of the left side gas, and the valve core still blocks the left side gas inlet, so that the gas in the first gas path passes through the selector valve to make the execution element work normally.

[0065] Optionally, the first gas control valve on the first gas path and the second gas control valve on the second gas path are provided with a gas inlet and a pilot gas inlet.

[0066] The gas inlet is used to introduce the gas from the external gas source into the first gas path and / or the second gas path, and the pilot gas inlet is used to introduce the pilot gas into the first gas control valve and the second gas control valve.

[0067] The gas from the external gas source enters the first gas path and / or the second gas path through the gas inlet, and the pilot gas enters the first gas control valve and the second gas control valve through the pilot gas inlet. The input of the pilot gas into the first gas control valve and the second gas control valve is remotely controlled by the electromagnetic valve, so that the gas control valve can work normally.

[0068] Optionally, the gas display device is arranged between the selector valve and the first gas control valve.

[0069] When the gas in the first gas path passes through the first gas control valve and the pressure of the gas is greater than the preset pressure, the gas display device is turned on.

[0070] When the gas in the first gas path passes through the first gas control valve and the pressure of the gas is less than the preset pressure, the gas display device is turned off.

[0071] The gas display device can be used to find out whether the gas control valve fails in time and replace it in time. The preset pressure can be set according to the specific working scene.

[0072] Optionally, the first gas control valve and the second gas control valve further comprise a pluggable self-sealing joint.

[0073] When the self-sealing joint is inserted, it is used to block the gas passing through the first gas control valve and / or the second gas control valve.

[0074] When the self-sealing joint is pulled out, it is used to make the gas passing through the first gas control valve and / or the second gas control valve flow.

[0075] When the gas control valve fails and needs to be repaired, the self-sealing joint can be inserted to block the gas control valve to prevent gas leakage.

[0076] During the working process of the system, the first gas path is the main gas supply path, the first gas control valve is the main valve, and the second gas control valve is the standby valve. When the first gas control valve fails, the valve core of the first gas control valve does not move, there is no pressure and flow, the gas display is extinguished, and the failure is prompted. At this time, the first gas control valve needs to be repaired or replaced. Since in the working state, the first gas control valve and the second gas control valve are in the air state, the manual valve is also in the same state, the first gas path and the second gas path supply gas to the selector valve at the same time. When the first gas control valve fails, the first gas path cannot supply gas normally. At this time, the left side of the selector valve has gas pressure, the right side has no gas pressure, and the left and right sides generate a gas pressure difference. The valve core moves from the left joint recess to the right joint recess under the action of the pressure difference, and blocks the right joint gas inlet. The second gas path supplies gas to the selector valve to make the actuator work normally. In the existing gas hole system, if the valve needs to be replaced when it fails, the total gas source needs to be closed, which affects the normal work of the actuator. The gas control valve control system provided in the embodiment can supply gas to the actuator normally when the valve fails without closing the gas source, so as to solve the problem that the actuator cannot work normally due to the failure of the valve in the prior art.

[0077] When the first gas control valve is replaced or repaired normally, the manual valve needs to be pressed to be in the air state, and the gas in the second gas path is blocked. At this time, the right side of the selector valve has gas pressure, and the left side has no gas pressure. Under the action of the pressure difference between the left and right sides, the valve core of the selector valve is blown to the left recess and slides to block the gas inlet of the left joint. The gas in the first gas path reaches the actuator through the selector valve. After the gas display in the first gas path is turned on again, the manual valve is pressed again to be in the air state. The gas in the first gas path smoothly passes through the selector valve. At this time, the left gas inlet is blocked, and the gas in the selector valve is still supplied by the first gas path. Through this, the gas path automatic switching under abnormal gas path pressure is realized, the turning on and extinguishing of the gas display device also reminds the abnormal problem of the gas path, which comprehensively protects the normal gas supply of the gas path and avoids the problem of stopping the actuator. The gas control valve control system provided in the embodiment is simple to operate, can be applied to flammable and explosive occasions, and can automatically switch to another valve when one valve is damaged, without affecting the actuation of the actuator. When repairing, the machine does not need to be stopped.

[0078] Unless specifically stated otherwise, terms such as processing, computing, calculating, determining, displaying, or the like, can refer to an action or process of one or more processing or computing systems, or similar devices, that manipulate or transform data represented as physical (e.g., electronic) quantities within the systems' registers or memories into other data similarly represented as physical quantities within the systems' memories, registers or other such information storage, transmission or display devices. The terms "data storage," "computer-readable medium," "memory," and the like can

[0079] It should be understood that the particular order in which the steps in the disclosed processes have been presented is exemplary. The particular order in which steps have been presented can be rearranged without departing from the spirit and scope of the disclosure. The accompanying method claims present elements of the various steps in exemplary order. The method claims are not to be interpreted in the exclusive sense, unless the equivalent steps are specifically stated in the claims.

[0080] In the above detailed description, various features are grouped together in a single embodiment for the purpose of streamlining the disclosure. This disclosed approach is not to be interpreted as reflecting an intention that the claimed embodiments require more features than are explicitly recited in each claim. Rather, as the claims below reflect, inventive subject matter can lie in fewer than all features of a single disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate preferred embodiment.

[0081] The above description includes one or more examples of the embodiments. Of course, not all possible combinations of components or steps are described above, but one of ordinary skill in the art will recognize that further combinations and permutations of each embodiment are possible. Accordingly, the embodiments described herein are intended to embrace all such alterations, modifications and variations going to the scope of the claims. Additionally, description of the term "comprising" or "containing" as used in the specification is intended to be similarly interpreted as the term "including" as that term is interpreted in the claims. Furthermore, any term "or" as used in the specification or claims is intended to mean "nonexclusive or."

Claims

1. A selector valve, characterized by The utility model relates to a kind of gas control valve, including: Main body, left joint, right joint, valve core and sealing pad; Gas outlet and hollow channel communicated with gas outlet are equipped on the main body, left joint and right joint are connected with two ends of hollow channel respectively; The joint is equipped with recess and gas inlet, recess outer wall is equipped with gas port, and gas port is communicated with gas outlet; Sealing pad is arranged at the both ends of the valve core, and the both ends of the valve core are embedded in the recess of left joint and right joint respectively, and the sealing pad is used to seal gas inlet;Valve core can slide in recess to block the gas inlet of one joint under the action of gas pressure difference generated by the gas inlet of two joints.

2. The selector valve of claim 1, wherein Further comprising: Sealing ring is arranged on both sides of the hollow channel of the main body, and the sealing ring is used to seal the main body and the joint;The joint is threadedly connected with the hollow channel of the main body.

3. The selector valve of claim 1, wherein The valve core comprises: first cylindrical section, second cylindrical section and third cylindrical section connected in sequence, the diameter of the first cylindrical section and the third cylindrical section is greater than the diameter of the second cylindrical section, and the length of the first cylindrical section and the third cylindrical section is less than the second cylindrical section; The end of the third cylindrical section connected with the second cylindrical section is provided with a circular arc chamfer, and the end of the third cylindrical section not connected with the second cylindrical section is provided with a sealing pad, and the end of the first cylindrical section not connected with the second cylindrical section is provided with a sealing pad; The third cylindrical section of the valve core is embedded in the recess of the right joint, the first cylindrical section is embedded in the recess of the left joint, and the diameter of the first cylindrical section and the third cylindrical section matches the diameter of the recess of the joint.

4. The selector valve of claim 1, wherein The sliding distance of the valve core is less than the depth of the recess, and in the case that the sealing pad of the valve core blocks the gas inlet of one joint, the gas inlet of the other joint, the gas port of the recess outer wall and the gas outlet of the main body are communicated.

5. A pneumatic valve control system, characterized by Including: First gas control valve and gas display device arranged on first gas path, second gas control valve and manual valve arranged on second gas path connected in parallel with first gas path, and selection valve connected with first gas path and second gas path; The first gas control valve is used to control the on-off of gas on the first gas path, and the second gas control valve is used to control the on-off of gas on the second gas path; The gas display device is used to display the on-off state of gas in the first gas path; The manual valve is used to control the on-off of the second gas path; The selection valve is used to output gas in the gas path to an execution element, and the selection valve is any one of the selection valves in claims 1-3.

6. The system of claim 5, wherein, The right joint of the selection valve is connected with the first gas path.

7. The system of claim 5, wherein, The first gas control valve on the first gas path and the second gas control valve on the second gas path are provided with gas inlet and pilot gas inlet; The gas inlet is used to introduce gas from external gas source into the first gas path and / or the second gas path, and the pilot gas inlet is used to introduce pilot gas into the first gas control valve and the second gas control valve.

8. The system of claim 5, wherein, The first gas control valve and the second gas control valve further comprise a pluggable self-sealing joint; When the self-sealing joint is inserted, it is used to block the gas passing through the first gas control valve and / or the second gas control valve; When the self-sealing joint is pulled out, it is used to make the gas passing through the first gas control valve and / or the second gas control valve flow.

9. The system of claim 5, wherein, The gas display device is arranged between the selection valve and the first gas control valve; When the gas in the first gas path passes through the first gas control valve and the pressure of the gas is greater than the preset pressure, the gas display device lights up. When the gas in the first gas path passes through the first gas control valve and the pressure of the gas is less than the preset pressure, the gas display device is turned off.

10. The system of claim 5, wherein, The manual valve is a normally open valve and is arranged between the second gas control valve and the selection valve. The manual valve is in a closed state when the second gas path is blocked.

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