Safety shut-off valve with remote shut-off and remote reset

Abstract

This utility model provides a safety shut-off valve with remote shut-off and remote reset capabilities, relating to the field of gas valve technology. It connects to a downstream gas source via a normally closed solenoid valve II. In case of emergency shut-off, the normally closed solenoid valve II is opened, allowing the downstream gas source to enter the upper chamber through a 304 stainless steel fitting II and a venting channel. This pushes the piston downwards, causing the valve stem and valve core to quickly close the main valve pipeline, achieving remote shut-off of the medium flow. When reset is required, the normally closed solenoid valve I is opened, allowing the medium in the upper chamber to be discharged through the 304 stainless steel fitting I to the venting pipe. This relieves the pressure above the piston. Combined with the opening and closing control of the normally open solenoid valve and the force of the reset spring, the piston is pushed upwards, causing the valve core to reset and restoring the main valve pipeline to normal operation. This system enables remote shut-off and reset.

Description

Technical Field

[0001] This utility model relates to the field of gas valve technology, specifically to a safety shut-off valve with remote shut-off and remote reset. Background Technology

[0002] A safety shut-off valve is a safety device used to quickly cut off the flow of media in a pipeline. It is widely used in petroleum, natural gas, and chemical industries to deal with emergencies such as overpressure, leakage, and fire. Its core features are that the fluid flows along the valve's axial or curved direction, resulting in low resistance, fast response, and reliable sealing.

[0003] Working principle of safety shut-off valve: When the pressure in the downstream pipeline rises to the set pressure of the safety shut-off valve pilot, the pilot damping nozzle opens, and gas enters the lower end of the pilot piston. Under the amplification effect of the pilot piston, the valve disc opens instantly and the gas quickly enters the main valve control chamber. The main valve piston amplifies the gas thrust, pushing the valve core to close quickly and shut off the main valve pipeline.

[0004] When troubleshooting requires resetting the safety shut-off valve, on-site operation is necessary. Close the pilot valve handle, open the vent valve handle to release the gas from the main valve control chamber, then close the vent valve handle and open the pilot valve handle. The main valve core will open under the action of the return spring, resetting the safety shut-off valve.

[0005] When an emergency shut-off valve needs to be shut off without pipeline overpressure, simply open the emergency shut-off handle; gas will enter the control chamber, and the shut-off valve will immediately close. For reset, first close the emergency shut-off handle; the remaining steps are the same as the automatic shut-off reset described above.

[0006] In mountainous or uninhabited areas, the station is equipped with electrical system control safety shut-off valves in case of emergency. In special circumstances, if the problem is identified through the system control room, the safety shut-off valves can be reset via the system to restore normal operation in a timely manner.

[0007] In Chinese patent literature, authorization announcement number CN216923344U, authorization announcement date July 8, 2022, entitled "A Novel Remote Cut-off Control Structure for a Safety Cut-off Valve," it includes a cut-off valve body and a cut-off control component connected to the cut-off valve body. The cut-off control component includes a pilot valve and a self-regulating pressure regulating valve connected to the pilot valve via a two-position three-way solenoid valve. The third port of the two-position three-way solenoid valve is connected to the inlet of the cut-off valve body, and the inlet of the self-regulating pressure regulating valve is connected to the outlet of the cut-off valve body. This utility model utilizes a two-position three-way solenoid valve to change the gas input of the pilot valve, thereby enabling automatic and active closing of the cut-off valve.

[0008] However, the aforementioned existing technologies only mention remote cut-off control structures and do not address the design of remote reset functions. After the equipment is cut off, manual reset may be required on-site. In unattended or hazardous scenarios, the convenience and timeliness of the reset operation are poor, which may affect the rapid recovery of the pipeline system, increase safety risks and operating costs. Utility Model Content

[0009] To address the shortcomings of the prior art, this utility model proposes a safety shut-off valve with remote shut-off and remote reset capabilities, enabling remote shut-off and reset.

[0010] The technical solution of this utility model is as follows:

[0011] A safety shut-off valve with remote shut-off and remote reset includes a main valve, a valve seat, a valve core, a valve core sleeve, a valve stem, a piston, a piston sleeve, a reset spring, an upper valve cover, a lower valve cover, a pilot valve, a normally closed solenoid valve I, a normally closed solenoid valve II, and a normally open solenoid valve. The main valve is fixedly connected to the upper valve cover and the lower valve cover, respectively. The valve seat is disposed inside the main valve, and the valve core sleeve is disposed on the valve seat. The valve core is slidably disposed inside the valve core sleeve, and the lower end of the valve core cooperates with the valve seat to form a sealing pair. A piston sleeve is disposed above the valve core sleeve, and the piston is slidably disposed inside the piston sleeve. The lower end of the valve stem is connected to the valve core, and the upper end of the valve stem is connected to the piston. The piston divides the cavity formed by the upper valve cover, the piston sleeve, and the valve core sleeve into an upper cavity and a lower cavity. The reset spring is located in the lower cavity and is connected to the lower end of the piston.

[0012] An air intake channel is provided between the upper valve cover and the piston sleeve; the normally closed solenoid valve I is connected to 304 stainless steel fitting I, one end of which is connected to the upper cavity through the air intake channel; the normally closed solenoid valve II is connected to 304 stainless steel fitting II, one end of which is connected to the upper cavity through the air intake channel, and the other end is connected to the rear air source; one end of the normally open solenoid valve is connected to the air intake channel through stainless steel fitting III, and the other end is connected to the pilot device through stainless steel fitting IV, which is connected to the rear air source.

[0013] Furthermore, a channel is provided between the upper valve cover and the main valve, the channel being connected to the outside, and an air passage is provided inside the piston sleeve, the channel being connected to the lower cavity through the air passage.

[0014] Furthermore, the other end of the 304 stainless steel pipe fitting I is connected to a vent pipe.

[0015] Furthermore, the upper valve cover is bolted to the main valve; the lower valve cover is bolted to the main valve.

[0016] Furthermore, an O-ring is provided between the upper valve cover and the piston sleeve for sealing.

[0017] Furthermore, an O-ring is provided between the valve seat and the main valve for sealing.

[0018] Furthermore, the piston, valve stem, and valve core are integrated as a single unit.

[0019] The beneficial effects of this utility model are as follows:

[0020] 1. Connect the downstream gas source through normally closed solenoid valve II. When an emergency shut-off is required, control normally closed solenoid valve II to open. The downstream gas source enters the upper cavity through the 304 stainless steel fitting II and the air intake channel, pushing the piston downward and causing the valve stem and valve core to quickly close the main valve pipeline, thereby achieving remote shut-off of the medium flow.

[0021] 2. When a reset is required, the normally closed solenoid valve I is opened, and the medium in the upper chamber can be discharged to the vent pipe through the 304 stainless steel fitting I, relieving the pressure above the piston. In conjunction with the opening and closing control of the normally open solenoid valve and the force of the reset spring, the piston is pushed upward, which drives the valve core to reset, so that the main valve pipeline can return to normal operation.

[0022] 3. By remotely controlling the opening and closing of the solenoid valve, no on-site personnel are required. Emergency situations (such as overpressure and leakage) can be handled directly in the system control room, ensuring timely handling in emergency situations and reducing losses and risks caused by the inability of personnel to arrive in time. It is suitable for scenarios where the station is located in mountainous or uninhabited areas where personnel cannot reach quickly. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 This is another structural schematic diagram of the present invention.

[0025] Figure descriptions: 1-Main valve, 2-Valve seat, 3-Valve core, 4-Valve core sleeve, 5-Valve stem, 6-Piston, 7-Piston sleeve, 8-Return spring, 9-Upper valve cover, 10-Lower valve cover, 11-Manipulator, 12-Normally closed solenoid valve I, 13-Normally closed solenoid valve II, 14-Normally open solenoid valve, 15-304 stainless steel fitting I, 16-304 stainless steel fitting II, 17-Stainless steel fitting III, 18-Stainless steel fitting IV, 19-Air duct, 20-Channel, 21-Air passage, 22-Bolt, 23-Rear air source, 24-Upper cavity, 25-Lower cavity. Detailed Implementation

[0026] Example 1

[0027] A safety shut-off valve with remote shut-off and remote reset includes a main valve 1, a valve seat 2, a valve core 3, a valve core sleeve 4, a valve stem 5, a piston 6, a piston sleeve 7, a reset spring 8, an upper valve cover 9, a lower valve cover 10, a pilot device 11, a normally closed solenoid valve I12, a normally closed solenoid valve II13, and a normally open solenoid valve 14. The main valve 1 is fixedly connected to the upper valve cover 9 and the lower valve cover 10 respectively. The valve seat 2 is disposed inside the main valve 1, the valve core sleeve 4 is disposed on the valve seat 2, and the valve core 3 is slidably disposed inside the valve core sleeve 4. The lower end of the valve core 3 cooperates with the valve seat 2 to form a sealing pair. A piston sleeve 7 is disposed above the valve core sleeve 4, and a piston 6 is slidably disposed inside the piston sleeve 7. The lower end of the valve stem 5 is connected to the valve core 3, and the upper end of the valve stem 5 is connected to the piston 6. The piston 6 divides the cavity formed by the upper valve cover 9, the piston sleeve 7, and the valve core sleeve 4 into an upper cavity 24 and a lower cavity 25. The reset spring 8 is located in the lower cavity 25 and is connected to the lower end of the piston 6.

[0028] An air intake channel 19 is provided between the upper valve cover 9 and the piston sleeve 7; the normally closed solenoid valve I12 is connected to a 304 stainless steel fitting I15, one end of which is connected to the upper cavity 24 through the air intake channel 19; the normally closed solenoid valve II13 is connected to a 304 stainless steel fitting II16, one end of which is connected to the upper cavity 24 through the air intake channel 19, and the other end is connected to the rear air source 23; one end of the normally open solenoid valve 14 is connected to the air intake channel 19 through a stainless steel fitting III17, and the other end is connected to the controller 11 through a stainless steel fitting IV18, and the controller 11 is connected to the rear air source 23.

[0029] (1) Normal shut-off and remote reset of safety shut-off valve

[0030] When the pipeline is overpressurized, the pressure of the downstream gas source 23 rises to the set value of the controller 11. The damping nozzle in the controller 11 opens, and the gas enters the lower end of the piston of the controller 11 through the damping nozzle. Under the amplified thrust of the piston of the controller 11, the valve disc opens fully at an instant. The gas enters the priming channel 19 through the 304 stainless steel fitting IV18, the normally open solenoid valve 14, and the stainless steel fitting III17, and then enters the upper cavity 24. The piston 6 in the main valve 1 amplifies the gas thrust, pushes the valve core 3 downward, and cuts off the pipeline of the main valve 1.

[0031] When a reset is required, the normally open solenoid valve 14 is closed, cutting off the gas supply 23 from the back end of the pilot valve 11 into the upper chamber 24. Then, the normally closed solenoid valve I12 is opened, and the gas medium in the upper chamber 24 is discharged through the 304 stainless steel fitting I15 and the normally closed solenoid valve I12. Then, the normally closed solenoid valve I12 is closed to stop the exhaust, and the normally open solenoid valve 14 is opened. The gas supply 23 from the back end enters the priming channel 19 through the pilot valve 11, the 304 stainless steel fitting IV18, the normally open solenoid valve 14, and the stainless steel fitting III17, and enters the upper chamber 24 to maintain normal pressure. The reset spring 8 pushes the piston 6 upward, the valve core 3 opens, and the main valve 1 pipeline resumes operation.

[0032] (2) Remote shut-off and remote reset of safety shut-off valve

[0033] When the back-end gas source 23 is not over-pressured and an emergency cut-off is required, the normally closed solenoid valve II13 is opened. The back-end gas source 23 enters the upper chamber 24 through the 304 stainless steel fitting II16 and the air intake channel 19. The pressure in the upper chamber 24 increases, pushing the piston 6 downward, which in turn closes the valve core 3 and cuts off the main valve 1 pipeline.

[0034] When remote reset is required, close the normally closed solenoid valve II13 to cut off the path of the gas source 23 into the upper chamber 24, open the normally closed solenoid valve I12, and the gas medium in the upper chamber 24 is discharged through the 304 stainless steel pipe fitting I15 and the normally closed solenoid valve I12. Then close the normally closed solenoid valve I12 to stop the exhaust. The reset spring 8 pushes the piston 6 in the main valve 1 upward, the valve core 3 opens, and the main valve 1 pipeline resumes operation.

[0035] Example 2

[0036] This embodiment further elaborates and supplements the implementation of this utility model based on Embodiment 1.

[0037] A channel 20 is provided between the upper valve cover 9 and the main valve 1, the channel 20 being connected to the outside. An air passage 21 is provided inside the piston sleeve 7, and the channel 20 is connected to the lower cavity 25 through the air passage 21. This ensures that the lower cavity 25 is always in a normal pressure state connected to the outside.

[0038] The other end of the 304 stainless steel pipe fitting I15 is connected to a vent pipe.

[0039] Example 3

[0040] This embodiment further elaborates and supplements the implementation of this utility model based on Embodiment 2.

[0041] The upper valve cover 9 is connected to the main valve 1 by bolts 22; the lower valve cover 10 is connected to the main valve 1 by bolts 22.

[0042] An O-ring is provided between the upper valve cover 9 and the piston sleeve 7 for sealing.

[0043] An O-ring is provided between the valve seat 2 and the main valve 1 for sealing.

[0044] The piston 6, valve stem 5, and valve core 3 are a single unit.

Claims

1. A safety shut-off valve with remote shut-off and remote reset, comprising a main valve (1), a valve seat (2), a valve core (3), a valve core sleeve (4), a valve stem (5), a piston (6), a piston sleeve (7), a reset spring (8), an upper valve cover (9), a lower valve cover (10), a pilot valve (11), a normally closed solenoid valve I (12), a normally closed solenoid valve II (13), and a normally open solenoid valve (14), wherein the main valve (1) is fixedly connected to the upper valve cover (9) and the lower valve cover (10), the valve seat (2) is disposed inside the main valve (1), and the valve core sleeve (4) is disposed inside the valve seat (9). 2) The valve core (3) is slidably disposed in the valve core sleeve (4), and the lower end of the valve core (3) cooperates with the valve seat (2) to form a sealing pair; a piston sleeve (7) is disposed above the valve core sleeve (4), and a piston (6) is slidably disposed in the piston sleeve (7). The lower end of the valve stem (5) is connected to the valve core (3), and the upper end of the valve stem (5) is connected to the piston (6). The piston (6) divides the cavity formed by the upper valve cover (9), the piston sleeve (7), and the valve core sleeve (4) into an upper cavity (24) and a lower cavity (25). The reset spring (8) is located in the lower cavity (25) and is connected to the lower end of the piston (6). An air intake channel (19) is provided between the upper valve cover (9) and the piston sleeve (7); the normally closed solenoid valve I (12) is connected to 304 stainless steel fitting I (15), one end of 304 stainless steel fitting I (15) is connected to the upper cavity (24) through the air intake channel (19); the normally closed solenoid valve II (13) is connected to 304 stainless steel fitting II (16), one end of 304 stainless steel fitting II (16) is connected to the upper cavity (24) through the air intake channel (19), and the other end is connected to the rear air source (23); one end of the normally open solenoid valve (14) is connected to the air intake channel (19) through stainless steel fitting III (17), and the other end is connected to the controller (11) through stainless steel fitting IV (18), and the controller (11) is connected to the rear air source (23).

2. A safety shut-off valve with remote shut-off and remote reset as described in claim 1, characterized in that: A channel (20) is provided between the upper valve cover (9) and the main valve (1), the channel (20) is connected to the outside, and an air passage (21) is provided inside the piston sleeve (7), the channel (20) is connected to the lower cavity (25) through the air passage (21).

3. A safety shut-off valve with remote shut-off and remote reset as described in claim 1 or 2, characterized in that: The other end of the 304 stainless steel pipe fitting I (15) is connected to the vent pipe.

4. A safety shut-off valve with remote shut-off and remote reset as described in claim 3, characterized in that: The upper valve cover (9) is connected to the main valve (1) by bolts (22); the lower valve cover (10) is connected to the main valve (1) by bolts (22).

5. A safety shut-off valve with remote shut-off and remote reset as described in claim 3, characterized in that: An O-ring is provided between the upper valve cover (9) and the piston sleeve (7) for sealing.

6. A safety shut-off valve with remote shut-off and remote reset as described in claim 3, characterized in that: An O-ring is provided between the valve seat (2) and the main valve (1) for sealing.

7. A safety shut-off valve with remote shut-off and remote reset as described in claim 3, characterized in that: The piston (6), valve stem (5), and valve core (3) are a single unit.

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