Shut-off valve

Abstract

The utility model relates to the technical field of aviation engineering equipment, in particular to a shut-off valve. The shut-off valve includes a housing, a bushing, a cap, an execution valve, a nozzle, and a spring. The lining is arranged in the containing cavity of the shell, the cap abuts against the lining, the execution valve is sleeved with the lining, a control cavity is defined by part of the outer circumferential wall of the execution valve and part of the inner circumferential wall of the lining, a spring cavity is defined by the inner side of the execution valve, part of the inner circumferential wall of the lining and the cap, and the control cavity is suitable for being communicated with the spring cavity through the electromagnetic valve. The spring is arranged in the spring cavity, one end of the spring abuts against the cap, the other end of the spring abuts against the end, away from the cap, of the bush, and the elastic force of the spring or the pressure difference between the control cavity and the spring cavity is suitable for driving the execution valve to move. Therefore, the defect of re-closing caused by instant pressure reduction after the execution valve is opened is overcome, and normal work of the shut-off valve is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of aviation engineering equipment, in particular to a shut-off valve. Background Art

[0002] With the rapid development of aviation technology, the heat load of electronic equipment in spacecraft is increasing. Traditional air circulation refrigeration systems are difficult to cool, and fuel is usually used for cooling. In addition, fuel also needs to cool the secondary power system and lubricating oil system of the engine, which makes the fuel system bear huge heat dissipation pressure, resulting in a significant increase in the temperature of the fuel at the engine inlet.

[0003] According to the engine requirements of the spacecraft, the traditional shut-off structure that requires oil return cannot be used. As the engine speed increases, the fuel pressure behind the throttle valve and the pressure in the lower chamber of the actuator valve increase, and the pressure value is transmitted to the electronic controller by the pressure sensor. When the pressure reaches the opening pressure required by the flow path, the electronic controller outputs a digital signal, the corresponding solenoid valve is energized, the middle chamber of the actuator valve is connected to the fuel in front of the metering valve, and the actuator valve opens. After the actuator valve opens, the pressure drops instantly, causing it to close again, thus affecting the normal operation of the shut-off valve. Utility Model Content

[0004] The utility model provides a shut-off valve, which is used to solve the defect in the prior art that the pressure drops instantly after the actuator valve is opened, resulting in re-closing, and realizes the normal operation of the shut-off valve.

[0005] The utility model provides a shut-off valve, comprising:

[0006] A housing, wherein the housing has a housing cavity, and the housing cavity has a first open end and a second open end;

[0007] A bushing, the bushing being arranged in the accommodating cavity;

[0008] A cap, the cap blocks the first open end, and the cap abuts against the bushing;

[0009] An actuator valve, the actuator valve is sleeved in the bushing, a part of the outer peripheral wall of the actuator valve and a part of the inner peripheral wall of the bushing define a control chamber, an inner side of the actuator valve, a part of the inner peripheral wall of the bushing and the cap define a spring chamber, and the control chamber is suitable for communicating with the spring chamber through a solenoid valve;

[0010] A nozzle, the nozzle is located at the second open end, the nozzle is communicated with the accommodating chamber, and the nozzle is fixedly connected to an end of the actuating valve away from the cap;

[0011] A spring is arranged in the spring cavity, and one end of the spring abuts against the cap, and the other end abuts against an end of the bushing away from the cap, and the elastic force of the spring or the pressure difference between the control cavity and the spring cavity is suitable for driving the actuator valve to move.

[0012] According to a shut-off valve provided by the utility model, the bushing comprises a first section, a second section and a third section connected in sequence, and an end of the first section away from the second section is located at the first open end;

[0013] A first bending structure is formed at a connection between the first section and the second section, and the first bending structure defines at least a portion of a boundary of the control cavity;

[0014] The first section, the second section and the third section together define a first step structure;

[0015] The inner wall of the first section is in sealing contact with a portion of the outer wall of the actuator valve;

[0016] There is a gap between the inner wall of the third section and part of the outer wall of the execution valve.

[0017] According to a shut-off valve provided by the utility model, the actuating valve comprises a fourth section, a fifth section and a sixth section connected in sequence, and an end of the fourth section away from the fifth section is located at the first open end;

[0018] The fourth section is opposite to the first section, and the outer peripheral wall of the fourth section is in sealing contact with the inner wall of the first section;

[0019] A second bending structure is formed at a connection between the fourth section and the fifth section, the second bending structure is opposite to the first bending structure, and the control cavity is defined between the second bending structure and the first bending structure;

[0020] The fourth section, the fifth section and the sixth section together define a second step structure;

[0021] The sixth section is opposite to the third section, and the gap is provided between the outer peripheral wall of the sixth section and the inner wall of the third section.

[0022] According to a shut-off valve provided by the utility model, a sealing ring is provided between the outer peripheral wall of the sixth section and the inner wall of the third section, and the sealing ring surrounds the outer periphery of the third section to separate the gap from the control chamber.

[0023] According to a shut-off valve provided by the utility model, a sealing gasket is provided between the nozzle and the actuating valve, the sealing gasket is fixed to the actuating valve by a clamping screw, a part of the clamping screw is located in the spring cavity, the clamping screw is fixed to the actuating valve by a clamping nut, and the clamping nut is located in the spring cavity.

[0024] The clamping screw is provided with a communication channel, and the communication channel is used to connect the spring chamber and the nozzle.

[0025] According to a shut-off valve provided by the utility model, an annular convex rib is provided on the nozzle, and the annular convex rib is in contact with the sealing gasket block.

[0026] According to a shut-off valve provided by the utility model, the connecting channel includes a main channel and a branch channel, the main channel is penetrated through the clamping screw along the length direction of the clamping screw, one end of the main channel is connected to the nozzle, one end of the branch channel is connected to the main channel, and the other end is connected to the spring chamber.

[0027] According to a shut-off valve provided by the utility model, there are a plurality of branch channels, and the plurality of branch channels are spaced apart along the circumferential direction of the clamping screw.

[0028] According to a shut-off valve provided by the utility model, it also includes a spring seat, the spring seat is located in the spring cavity, the spring seat is fixedly connected to the cap, and the spring is sleeved on the spring seat.

[0029] The shut-off valve provided by the utility model utilizes the cooperation between the bushing and the executing valve, so as to avoid the defect of closing again due to instantaneous pressure drop after the executing valve is opened, thereby realizing the normal operation of the shut-off valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the present invention or the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 It is a three-dimensional diagram of the shut-off valve provided by the utility model;

[0032] Figure 2 It is a cross-sectional view of an exploded view of the shut-off valve provided by the utility model;

[0033] Figure 3 It is a cross-sectional view of the shut-off valve provided by the utility model;

[0034] Figure 4 It is a partial structural schematic diagram of a cross-sectional view of a shut-off valve provided by the utility model;

[0035] Figure 5 is a cross-sectional view of the bushing provided by the utility model;

[0036] Figure 6 It is a cross-sectional view of the execution valve provided by the utility model;

[0037] Figure 7 The utility model discloses an oil circuit diagram of a shut-off valve.

[0038] Reference numerals:

[0039] 100. Shut-off valve;

[0040] 110. housing; 111. accommodating chamber;

[0041] 120, bushing; 121, first section; 122, second section; 123, first bending structure; 124, third section; 125, first step structure;

[0042] 130, actuator valve; 131, fourth section; 132, fifth section; 133, second bending structure; 134, sixth section; 135, second step structure; 136, sealing ring;

[0043] 140, cap; 141, control chamber; 142, spring chamber;

[0044] 150, nozzle; 151, annular rib; 152, sealing pad; 153, spring; 154, spring seat;

[0045] 160, tightening screw; 161, connecting channel; 162, main channel; 163, branch channel;

[0046] 170, tighten the nut;

[0047] 180, first actuating valve oil circuit; 181, first actuating valve; 182, first solenoid valve; 183, first nozzle;

[0048] 190. Second actuator valve oil circuit; 191. Second actuator valve; 192. Second solenoid valve; 193. Second nozzle. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the utility model clearer, the technical solution of the utility model will be described clearly and completely in conjunction with the drawings in the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0050] Combine the following Figure 1-Figure 7 Describe the shut-off valve 100 of the present invention. It is worth understanding that the following description is only an exemplary description, and not a specific limitation of the present invention. The fuel branch module of the shut-off valve 100 uses a corresponding solenoid valve to control the opening and switching of the first actuator valve oil circuit 180 and the second actuator valve oil circuit 190. When the corresponding solenoid valve is not energized, the first actuator valve oil circuit 180 and the second actuator valve oil circuit 190 are in a closed state; when the corresponding solenoid valve is energized, the first actuator valve oil circuit 180 and the second actuator valve oil circuit 190 are in an open state. And in the fuel shut-off state, there can be no leakage at the inlet pressure of (0.4±0.05)MPa and (10±0.05)MPa. In order to achieve the above functions, a structure similar to a hydraulic balancing valve is adopted for design.

[0051] See also Figure 1-Figure 6 As shown, the shut-off valve 100 according to the embodiment of the present utility model includes: a housing 110 , a bushing 120 , a cap 140 , an actuator valve 130 , a nozzle 150 and a spring 153 .

[0052] Specifically, the housing 110 has a housing chamber 111, and the housing chamber 111 has a first open end and a second open end. The bushing 120 is disposed in the housing chamber 111, and the cap 140 blocks the first open end, and the cap 140 abuts against the bushing 120. Figure 3 As shown, the cap 140 is concave on one side facing the bushing 120 to form a groove structure, and the groove wall of the groove structure abuts against the bushing 120 , so that the cap 140 can be fixedly connected to the housing 110 .

[0053] Combination Figure 2 and Figure 3 As shown, the actuator valve 130 is sleeved in the bushing 120, and a portion of the outer peripheral wall of the actuator valve 130 and a portion of the inner peripheral wall of the bushing 120 define a control chamber 141, and the control chamber 141 is communicated with the electromagnetic valve. A spring 153 chamber 142 is defined between the inner side of the actuator valve 130, a portion of the inner peripheral wall of the bushing 120, and the cap 140, and the control chamber 141 is suitable for communicating with the spring 153 chamber 142 through the electromagnetic valve.

[0054] The nozzle 150 is located at the second open end, and the nozzle 150 is communicated with the accommodating chamber 111, and the nozzle 150 is fixedly connected to the end of the actuator valve 130 away from the cap 140. The spring 153 is arranged in the spring 153 chamber 142, and one end of the spring 153 abuts against the cap 140, and the other end abuts against the end of the bushing 120 away from the cap 140. The elastic force of the spring 153 or the pressure difference between the control chamber 141 and the spring 153 chamber 142 is suitable for driving the actuator valve 130 to move.

[0055] According to some embodiments of the present invention, Figure 5 As shown, the bushing 120 may include a first section 121, a second section 122 and a third section 124 connected in sequence. The end of the first section 121 away from the second section 122 is located at the first open end, and the connection between the first section 121 and the second section 122 forms a first bending structure 123, and the first bending structure 123 defines at least part of the boundary of the control chamber 141. The first section 121, the second section 122 and the third section 124 together define a first step structure 125. The inner wall of the first section 121 is in sealing contact with a part of the outer wall of the actuator valve 130. There is a gap between the inner wall of the third section 124 and a part of the outer wall of the actuator valve 130.

[0056] Furthermore, if Figure 6 As shown, the actuator valve 130 may include a fourth section 131, a fifth section 132 and a sixth section 134 connected in sequence, and one end of the fourth section 131 away from the fifth section 132 is located at the first open end. The fourth section 131 is opposite to the first section 121, and the outer peripheral wall of the fourth section 131 is in sealing contact with the inner wall of the first section 121. The connection between the fourth section 131 and the fifth section 132 forms a second bending structure 133, the second bending structure 133 is opposite to the first bending structure 123, and the second bending structure 133 and the first bending structure 123 define a control chamber 141. The fourth section 131, the fifth section 132 and the sixth section 134 jointly define a second step structure 135. The sixth section 134 is opposite to the third section 124, and there is a gap between the outer peripheral wall of the sixth section 134 and the inner wall of the third section 124.

[0057] The actuator valve 130 can be constructed into a step-type valve structure, which can realize the control function through the area difference. It can be understood that the actuator valve 130 is designed as a step-type structure, and three fuel channels are formed between the actuator valve 130, the bushing 120, and the housing 110 to realize the fuel shut-off and fuel boost on-off control functions. In the related art, the inlet pressure range of the shut-off valve 100 is (1.2-10) MPa, the switching point flow rate of the actuator valve 130 is 0.158 kg / s, and the pressure difference is 0.8 MPa. The shut-off valve 100 has no return oil circuit, so before starting, the oil pressure inside the housing 110 is the fuel inlet pressure, and there is no pressure difference. Considering extreme situations, the shut-off valve 100 may need to be opened at a fuel inlet pressure of 0.8 MPa. In design, the actuator valve 130 is set to a fuel inlet pressure of 0.8 MPa, and the actuator valve 130 should be able to open when the solenoid valve is energized. After opening, within the fuel inlet pressure range of (1.2-10)MPa, the solenoid valve should always remain in the open state when energized.

[0058] The shut-off valve 100 also needs to realize the solenoid valve parking function, so when the solenoid valve is powered off, the actuator valve 130 should be able to stop the vehicle. Considering that the fuel inlet pressure may still be high pressure oil when the vehicle is stopped, the actuator valve 130 is designed to be in a closed state when the fuel inlet pressure is 10MPa after the vehicle is stopped.

[0059] The radius of the pressure action surface of the spring 153 cavity 142 of the actuator valve 130 is set to a (the radius of the fourth section 131 is a), the radius of the lower end of the actuator valve 130 is set to b (the radius of the fifth section 132 is b), the radius of the raised circular ring of the sealing ring is set to c (the radius of the sixth section 134 is c), the fuel inlet pressure is P1, the pressure after the throttling valve is P2, and the flow path back pressure is P3. The design calculation of the diameter of the actuator valve 130 is carried out according to the above-mentioned setting conditions.

[0060] In some examples, the radius a of the fourth section 131 may be 19 mm, the radius b of the fifth section 132 may be 10 mm, and the radius c of the sixth section 134 may be 9.5 mm. Thus, the shutoff valve 100 can meet working requirements in different states.

[0061] According to some embodiments of the present invention, Figure 4As shown, a sealing ring 136 is provided between the outer peripheral wall of the sixth section 134 and the inner wall of the third section 124, and the sealing ring 136 surrounds the outer periphery of the third section 124 to separate the gap from the control chamber 141. In order to ensure the sealing effect of the shut-off valve 100 in the shut-off state, the sealing of the actuator valve 130 when closed adopts the sealing method of end face compression. Under the action of the spring 153, the sealing gasket on the actuator valve 130 is pressed on the raised ring of the sealing ring, thereby achieving a sealing effect. A radial movable sealing ring 136 is provided on the actuator valve 130 to prevent the fuel from leaking into the control chamber 141 from the gap between the actuator valve 130 and the actuator valve 130 bushing 120, and then flowing into the spring 153 chamber 142 of the actuator valve 130 through the solenoid valve and entering the corresponding outlet.

[0062] In terms of materials, the actuator valve 130 and the bushing 120 may use valve bushing 120 type material 9Cr18, and its heat treatment HRC hardness is 58-64HRC.

[0063] According to some embodiments of the present invention, Figure 4 As shown, a sealing gasket 152 is provided between the nozzle 150 and the actuator valve 130. The sealing gasket 152 is fixed to the actuator valve 130 by a clamping screw 160. Part of the structure of the clamping screw 160 is located in the spring 153 cavity 142. The clamping screw 160 is fixed to the actuator valve 130 by a clamping nut 170. The clamping nut 170 is located in the spring 153 cavity 142. A connecting channel 161 is provided on the clamping screw 160. The connecting channel 161 is used to connect the spring 153 cavity 142 and the nozzle 150.

[0064] According to some embodiments of the present invention, Figure 4 As shown, the nozzle 150 is provided with an annular convex rib 151, and the annular convex rib 151 contacts the sealing pad 152. The sealing pad 152 can be made of SFB-1 polytetrafluoroethylene material.

[0065] The actuator valve 130 is pressed downward by the spring 153. A sealing pad 152 is installed at the end of the actuator valve 130 and is fixed to the actuator valve 130 by a clamping screw 160 and a clamping nut 170. A sealing ring is installed at the corresponding position of the housing 110. The sealing ring has a circular protrusion. In the closed state, the actuator valve 130 is pushed downward by the force of the spring 153 until it stops against the sealing ring. The circular protrusion presses on the non-metallic sealing pad 152 to achieve a sealing function in the closed state.

[0066] A sealing ring 136 is provided on the bushing 120 of the actuator valve 130 to achieve radial movable sealing when the actuator valve 130 moves, so as to prevent the fuel from leaking into the control chamber 141 from the gap between the actuator valve 130 and the bushing 120 when the shut-off valve 100 is closed, and then leaking to the corresponding outlet. After the actuator valve 130 and the bushing 120 are installed on the housing 110, the ends are fixed and pressed on the housing 110 by screw plugs.

[0067] The actuating valve 130 presses the sealing gasket 152 downward under the action of the spring 153, and the oil circuit from the shutoff valve 100 to the actuating valve 130 is closed. As the inlet pressure of the shutoff valve 100 increases, when the opening pressure specified by the oil circuit of the actuating valve 130 is reached, the solenoid valve is energized, the control chamber 141 is connected to the inlet pressure of the shutoff valve 100, and the actuating valve 130 moves under the action of the high-pressure oil in the control chamber 141, and the actuating valve 130 opens. At the same time, the area of ​​the actuating valve 130 affected by the fuel pressure behind the throttling valve increases, and its upward force keeps the actuating valve 130 always in an open state.

[0068] When it is necessary to stop the shut-off valve 100 from working, the electronic controller outputs a closing signal to the solenoid valve, and the solenoid valve closes, so that the control chamber 141 is connected to the spring 153 chamber 142 of the actuator valve 130 through the solenoid valve. At this time, the pressures at both ends of the actuator valve 130 and the control chamber 141 are equal, and the actuator valve 130 moves to close under the action of the spring 153. After closing, the end of the actuator valve 130 is affected by the fuel pressure behind the throttling valve, and the area is reduced. Under the action of the elastic force of the spring 153, the actuator valve 130 always keeps the sealing ring pressed, thereby realizing the function of closing the fuel to the actuator valve 130.

[0069] According to some embodiments of the present invention, Figure 4 As shown, the communication channel 161 includes a main channel 162 and a branch channel 163. The main channel 162 is provided in the compression screw 160 along the length direction of the compression screw 160. One end of the main channel 162 is communicated with the nozzle 150. One end of the branch channel 163 is communicated with the main channel 162, and the other end is communicated with the spring 153 cavity 142. Further, there are multiple branch channels 163, and the multiple branch channels 163 are spaced apart along the circumferential direction of the compression screw 160.

[0070] According to some embodiments of the present invention, Figure 2 and Figure 3 As shown, the shut-off valve 100 further includes a spring seat 154 , which is located in the spring 153 cavity 142 , and the spring seat 154 is fixedly connected to the cap 140 , and the spring 153 is sleeved on the spring seat 154 .

[0071] Refer to the following Figure 7The shut-off valve 100 according to the embodiment of the present utility model is described in detail. Figure 7 As shown, the shut-off valve 100 may include a first fuel branch module and a second fuel branch module, which may be used to realize the function of respectively directing the metered fuel to the first nozzle 183 and the second nozzle 193 and the solenoid valve parking function.

[0072] Combination Figure 7 As shown, the oil circuit of the shut-off valve 100 includes a first actuating valve oil circuit 180 and a second actuating valve oil circuit 190. The first actuating valve oil circuit 180 is provided with a first actuating valve 181, a first solenoid valve 182 and a first nozzle 183; the second actuating valve oil circuit 190 is provided with a second actuating valve 191, a second solenoid valve 192 and a second nozzle 193.

[0073] See also Figure 7 As shown, the first solenoid valve 182 and the second solenoid valve 192 are both two-inlet and one-outlet two-position three-way solenoid valves. When the power is off, the outlet of the corresponding solenoid valve is the fuel after the throttling valve; when the power is on, the outlet of the corresponding solenoid valve is switched to the high-pressure fuel before the metering valve. When the shut-off valve 100 is not started, the two actuator valves 130 are at the bottom under the force of the spring 153, and the oil circuit leading to the two nozzles 150 (the first nozzle 183 and the second nozzle 193) is closed. When the shut-off valve 100 is started, the lower chamber, middle chamber and upper chamber of the corresponding actuator valve 130 are all connected to the fuel after the throttling valve, and the force of the fuel in the middle chamber and the lower chamber pushing the valve upward is less than the force of the fuel in the upper chamber and the spring 153 pushing the valve downward, and the valve is in a closed state.

[0074] As the engine speed increases, the fuel pressure behind the throttle valve, the pressure of the first actuator valve oil circuit 180 and the second actuator valve oil circuit 130 also increase, and the pressure value is transmitted to the electronic controller by the pressure sensor. When the pressure reaches the opening pressure required by the first actuator valve 181 and the second actuator valve 191, the electronic controller outputs a digital signal, and the solenoid valve of the corresponding actuator valve 130 is energized, and the middle cavity of the actuator valve 130 is connected with the fuel in front of the metering valve. At this time, the force of the fuel in the middle cavity and the lower cavity pushing the valve upward is greater than the force of the fuel in the upper cavity and the spring 153 pushing the valve downward, and the actuator valve 130 opens, opening the oil circuit leading to the corresponding nozzle 150. At the same time, the action area of ​​the fuel in the lower cavity of the actuator valve 130 increases, avoiding the situation where the valve is closed again due to the instantaneous pressure drop after opening.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the utility model.

Claims

1. A shut-off valve, characterized in that: include: A housing, wherein the housing has a housing cavity, and the housing cavity has a first open end and a second open end; A bushing, the bushing being arranged in the accommodating cavity; A cap, the cap blocks the first open end, and the cap abuts against the bushing; An actuator valve, the actuator valve is sleeved in the bushing, a part of the outer peripheral wall of the actuator valve and a part of the inner peripheral wall of the bushing define a control chamber, an inner side of the actuator valve, a part of the inner peripheral wall of the bushing and the cap define a spring chamber, and the control chamber is suitable for communicating with the spring chamber through a solenoid valve; A nozzle, the nozzle is located at the second open end, the nozzle is communicated with the accommodating chamber, and the nozzle is fixedly connected to an end of the actuating valve away from the cap; A spring is arranged in the spring cavity, and one end of the spring abuts against the cap, and the other end abuts against an end of the bushing away from the cap, and the elastic force of the spring or the pressure difference between the control cavity and the spring cavity is suitable for driving the actuator valve to move.

2. The shut-off valve according to claim 1, characterized in that: The bushing comprises a first section, a second section and a third section connected in sequence, wherein an end of the first section away from the second section is located at the first open end; A first bending structure is formed at a connection between the first section and the second section, and the first bending structure defines at least a portion of a boundary of the control cavity; The first section, the second section and the third section together define a first step structure; The inner wall of the first section is in sealing contact with a portion of the outer wall of the actuator valve; There is a gap between the inner wall of the third section and part of the outer wall of the execution valve.

3. The shut-off valve according to claim 2, characterized in that: The actuating valve comprises a fourth section, a fifth section and a sixth section connected in sequence, and an end of the fourth section away from the fifth section is located at the first open end; The fourth section is opposite to the first section, and the outer peripheral wall of the fourth section is in sealing contact with the inner wall of the first section; A second bending structure is formed at a connection between the fourth section and the fifth section, the second bending structure is opposite to the first bending structure, and the control cavity is defined between the second bending structure and the first bending structure; The fourth section, the fifth section and the sixth section together define a second step structure; The sixth section is opposite to the third section, and the gap is provided between the outer peripheral wall of the sixth section and the inner wall of the third section.

4. The shut-off valve according to claim 3, characterized in that: A sealing ring is provided between the outer peripheral wall of the sixth section and the inner wall of the third section, and the sealing ring surrounds the outer periphery of the third section to separate the gap from the control chamber.

5. The shut-off valve according to claim 1, characterized in that: A sealing gasket is provided between the nozzle and the actuator valve, and the sealing gasket is fixed to the actuator valve by a clamping screw, a part of the clamping screw is located in the spring cavity, and the clamping screw is fixed to the actuator valve by a clamping nut, and the clamping nut is located in the spring cavity. The clamping screw is provided with a communication channel, and the communication channel is used to connect the spring chamber and the nozzle.

6. The shut-off valve according to claim 5, characterized in that: An annular convex rib is provided on the nozzle, and the annular convex rib is in contact with the sealing gasket block.

7. The shut-off valve according to claim 5, characterized in that: The connecting channel includes a main channel and a branch channel. The main channel is arranged in the clamping screw along the length direction of the clamping screw. One end of the main channel is connected to the nozzle. One end of the branch channel is connected to the main channel, and the other end is connected to the spring chamber.

8. The shut-off valve according to claim 7, characterized in that: There are a plurality of branch channels, and the plurality of branch channels are spaced apart along the circumferential direction of the compression screw.

9. The shut-off valve according to claim 1, characterized in that: It also includes a spring seat, which is located in the spring cavity and is fixedly connected to the cap, and the spring is sleeved on the spring seat.

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