CN108716558B - Axial flow type safety cut-off valve and overpressure cut-off control system thereof - Google Patents
Axial flow type safety cut-off valve and overpressure cut-off control system thereof Download PDFInfo
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- CN108716558B CN108716558B CN201810769114.0A CN201810769114A CN108716558B CN 108716558 B CN108716558 B CN 108716558B CN 201810769114 A CN201810769114 A CN 201810769114A CN 108716558 B CN108716558 B CN 108716558B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
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Abstract
The application discloses an axial-flow type safety cut-off valve and an overpressure cut-off control system thereof, which comprise a left valve body, a right valve body, a valve seat, a valve core, a valve rod, a valve core sleeve, a piston sleeve and a piston; the left valve body, the valve seat and the valve core form an inlet space; the valve core is connected in the valve core sleeve in a sliding way, and a left space is formed by the valve core and the inner side of the valve core sleeve; the right side of the valve core sleeve, the inner side of the piston sleeve and the left side of the piston form a damping space; a reset spring is arranged in the damping space; the piston sleeve, the piston and the left side of the right valve body inner sleeve form a right space; the piston sleeve is provided with a signal medium hole which communicates the right space with an outlet of the overpressure control valve; the axial flow type safety cut-off valve does not need external energy sources when in work, and is automatically cut off by utilizing the pressure energy of a medium. The valve has small pressure loss, large circulation capacity and low noise when in operation; the system has the functions of single overpressure cutting, multi-stage overpressure cutting, remote control and the like. Is especially suitable for the large-flow conveying occasions such as long-distance natural gas conveying pipelines, sub-conveying stations and the like.
Description
Technical Field
The invention relates to the technical field of gas valves, in particular to an axial-flow type safety cut-off valve and an overpressure cut-off control system thereof.
Background
The typical pressure control system of the gas transmission and distribution station mainly comprises a safety cut-off valve, a monitoring pressure regulator and a flow (pressure) regulating valve for working, wherein an outlet of the safety cut-off valve is connected with a pipeline in front of the valve of the monitoring pressure regulator through a flange, a control valve of the safety cut-off valve is connected with a pipeline behind the valve of the flow regulating valve for working through a pressure guiding signal pipe, a downstream feedback control pressure signal is received, the opening and closing of the safety cut-off valve are controlled, the downstream pressure is controlled within a set range, and the normal downstream pipeline gas supply pressure and the safe gas delivery are ensured.
The utility model discloses a self-operated safety cut-off valve with a publication number of CN204062039U, which is disclosed by the utility model in the state of 12 months 31 of 2014, and comprises a sensing element, an actuating mechanism and a cut-off valve, wherein the actuating mechanism comprises a shell, a compression spring and a lever assembly, the compression spring and the lever assembly are arranged in the shell, the sensing element is arranged on the upper end face of the shell, the upper end of the sensing element is connected with a monitored pipeline through a pressure taking pipe, the lower end of the sensing element is connected with the upper end of the compression spring, the lower end of the compression spring is connected with the lever assembly, and the other end of the lever assembly is connected with a valve rod of the cut-off valve.
At present, the safety cut-off valve needs external energy during working, electric control or manual control is generally adopted, manual operation is needed, applicability is narrow, and large noise exists during working.
Disclosure of Invention
In order to overcome the defects and the shortcomings in the prior art, the self device provides an axial flow type safety cut-off valve and an overpressure cut-off control system thereof, and the application aims to overcome the defects. The valve has small pressure loss, large circulation capacity and low noise when in operation; the system has the functions of single overpressure cutting, multi-stage overpressure cutting, remote control and the like. Is especially suitable for the large-flow conveying occasions such as long-distance natural gas conveying pipelines, sub-conveying stations and the like.
In order to solve the problems in the prior art, the application is realized by the following technical scheme:
The utility model provides an axial-flow type safety stop valve, includes left valve body and right valve body, its characterized in that: the valve further comprises a valve seat, a valve core, a valve rod, a valve core sleeve, a piston sleeve and a piston, wherein the right valve body comprises a right valve body inner sleeve and a right valve body outer sleeve; the valve core, the valve rod and the piston form a power transmission mechanism; the left valve body, the valve seat and the valve core form an inlet space; the valve core is connected in the valve core sleeve in a sliding way, a left space is formed by the valve core and the inner side of the valve core sleeve, a damping space is formed by the right side of the valve core sleeve, the inner side of the piston sleeve and the left side of the piston, and a reset spring is arranged in the damping space; the piston sleeve is provided with a breathing hole which communicates the damping space with the outside; the piston sleeve. The piston and the left side of the right valve body inner sleeve form a right space; the piston sleeve is provided with a piston sleeve flow passage hole, and an outlet space is formed by the interval between the inner side of the left valve body and the outer side of the valve core sleeve, the piston sleeve flow passage hole, the right valve body flow passage hole and the interval between the right valve body inner sleeve and the right valve body outer sleeve; the piston sleeve is provided with a signal medium hole, and the signal medium hole is used for communicating the right space with an instrument interface arranged on the outer sleeve of the right valve body.
The valve core sleeve is provided with a window meeting the flow requirement, and the window is used for communicating an inlet space and an outlet space.
The valve core is provided with a balance hole which is used for balancing the pressure of the inlet space and the left space.
And a valve position indicator is arranged at the instrument interface and used for displaying the opening or closing position of the valve core.
The utility model provides an superpressure of axial-flow type safety stop valve cuts control system which characterized in that: comprises an axial flow type safety cut-off valve and a plurality of overpressure control valves;
The axial-flow type safety cut-off valve comprises a left valve body, a right valve body, a valve seat, a valve core, a valve rod, a valve core sleeve, a piston sleeve and a piston, wherein the right valve body comprises a right valve body inner sleeve and a right valve body outer sleeve; the valve core, the valve rod and the piston form a power transmission mechanism; the left valve body, the valve seat and the valve core form an inlet space; the valve core is connected in the valve core sleeve in a sliding way, a left space is formed by the valve core and the inner side of the valve core sleeve, a damping space is formed by the right side of the valve core sleeve, the inner side of the piston sleeve and the left side of the piston, and a reset spring is arranged in the damping space; the piston sleeve is provided with a breathing hole which communicates the damping space with the outside; the piston sleeve, the piston and the left side of the right valve body inner sleeve form a right space; the piston sleeve is provided with a piston sleeve flow passage hole, and an outlet space is formed by the interval between the inner side of the left valve body and the outer side of the valve core sleeve, the piston sleeve flow passage hole, the right valve body flow passage hole and the interval between the right valve body inner sleeve and the right valve body outer sleeve; the piston sleeve is provided with a signal medium hole which communicates the right space with an outlet of the overpressure control valve;
The overpressure control valves are connected with the axial-flow type safety cut-off valve, and outlets of the overpressure control valves are communicated with the right space of the axial-flow type safety cut-off valve; the inlet of the overpressure control valve is connected to the downstream outlet conduit.
The pressure regulator is characterized by further comprising a plurality of pressure regulators, one overpressure control valve corresponds to one pressure regulator, an outlet of the overpressure control valve is communicated with the right space of the axial flow type safety cut-off valve, and an inlet of the overpressure control valve is connected with an outlet pipeline of the corresponding pressure regulator.
The number of the overpressure control valves is one, the number of the pressure regulators is one, and the outlet of the overpressure control valves is communicated with the right space of the axial flow type safety cut-off valve; an inlet of the overpressure control valve is connected with an outlet pipeline of the pressure regulator.
The number of the overpressure control valves is two, namely a primary overpressure control valve and a secondary overpressure control valve, the number of the pressure regulators is two, namely a primary pressure regulator and a secondary pressure regulator, and outlets of the primary overpressure control valve and the secondary overpressure control valve are communicated with the right space of the axial flow type safety cut-off valve; an inlet of the primary overpressure control valve is connected with an outlet pipeline of the primary pressure regulator, and an inlet of the secondary overpressure control valve is connected with an outlet pipeline of the secondary pressure regulator.
The valve core sleeve is provided with a window meeting the flow requirement, and the window is used for communicating an inlet space and an outlet space.
The valve core is provided with a balance hole which is used for balancing the pressure of the inlet space and the left space.
In the application, the overpressure control valve is a pneumatic controller disclosed in a patent document with a publication number of CN201462116U, named as a fuel gas safety shut-off valve.
The overpressure control valve comprises a control valve body, a control valve spool, a control valve piston shaft rod, a middle valve box, a control valve upper valve cover, a second spring, an air inlet valve, a drain valve and a pressure guide hole, wherein the pressure guide hole is communicated with the right space, the sealing area of the control valve spool is larger than the sectional area of the control valve piston shaft rod, the setting force of the second spring is equal to the product of the sealing area of the control valve spool and the medium pressure, and the stress area of an upper cavity of the control valve piston is equal to the sectional area of the control valve piston shaft rod subtracted by the sectional area of the control valve piston shaft rod. The overpressure control valve is designed into a labyrinth damping piston structure, and the sealing adopts hard and soft sealing. The pneumatic controller further comprises an end cover connected with the second upper valve cover and an adjusting screw rod penetrating through the end cover, and the bottom end of the adjusting screw rod is in contact with the second spring.
The working principle of the application is as follows:
When the axial-flow type safety cut-off valve is opened and normally works, the air inlet valve of the overpressure control valve is normally opened, the drain valve is normally closed, and the valve core of the overpressure control valve is always in a closed sealing state under the action of the spring force of the second spring. Under the normal running condition of the axial flow type safety cut-off valve, the valve core of the overpressure control valve is in a closed state, no gas medium enters the right space, the pressure of the medium in the right space is close to 0 value, the valve core of the axial flow type safety cut-off valve is always in an open state under the action of the pressure of the medium and the action force of a reset spring, when the gas pressure of an outlet pipeline at the downstream of the system is increased to a set cut-off pressure, the valve core of the overpressure control valve is opened, the gas medium enters the right space through a pressure guide pipe and a signal medium hole, and under the action force of the right space, the valve core of the axial flow type safety cut-off valve is pushed by a power transmission mechanism to quickly move leftwards to contact with a valve seat under the action of piston amplification of the axial flow type safety cut-off valve, so that the paths of the inlet space and the outlet space are cut-off, and the axial flow type safety cut-off valve is quickly closed, and the air flow is cut off. The right space is communicated with the upper end of the piston shaft rod through a small hole on the air inlet valve to generate back pressure, the pressure of a downstream pipeline is reduced after the axial flow type safety cut-off valve is cut off, the air inlet valve is closed, the drain valve is opened, the air in the right space of the axial flow type safety valve is discharged, then the drain valve is closed, the handle of the air inlet valve is opened, the valve core of the axial flow type safety valve is separated from the valve seat under the action of the reset spring, the inlet space and the outlet space are restored to be in a communicated state, and the safety cut-off valve is reset.
Compared with the prior art, the beneficial technical effects brought by the application are as follows:
1. The axial flow type safety cut-off valve does not need external energy when in operation, is automatically cut off by utilizing the pressure energy of a medium, has small pressure loss when in operation, has large circulation capacity and low noise; the system has the functions of single overpressure cutting, multi-stage overpressure cutting, remote control and the like. Is especially suitable for the large-flow conveying occasions such as long-distance natural gas conveying pipelines, sub-conveying stations and the like. The traditional axial flow type safety cut-off valve adopts electric control or manual control, has low response speed, can not be cut off and opened in real time according to the pressure of a downstream pipeline, and simultaneously needs external energy for driving, when the valve core is opened, the valve core can not ensure a full-open state, and the valve core opening response is slower.
2. When the pressure of the pipeline rises to reach the set pressure of the overpressure controller, the damping nozzle of the controller is opened, gas enters the lower end of the piston of the controller, and the valve clack is instantly fully opened under the amplification effect of the piston. The gas rapidly enters the right space, the gas thrust is amplified by the piston, the valve core is pushed by the power transmission mechanism to rapidly move leftwards to contact the valve seat, the passages of the inlet space and the outlet space are cut off, and the safety cut-off valve is rapidly closed.
3. The overvoltage cut-off control system of the axial flow type safety cut-off valve can realize the multistage control of the downstream pipeline, and the downstream pipeline is controlled in a grading manner, if an overvoltage phenomenon occurs at a certain downstream outlet pipeline, the overvoltage phenomenon can be rapidly reflected to the axial flow type safety cut-off valve, the pipeline is cut off and controlled, the safety of pipeline conveying is enhanced, and the system is particularly suitable for large-flow conveying occasions such as natural gas long-distance conveying pipelines and branch conveying stations.
Drawings
FIG. 1 is a schematic view of an axial flow safety shut-off valve according to the present application;
FIG. 2 is a cross-sectional view of the right valve body of the axial flow type safety shut-off valve of the present application;
FIG. 3 is a block diagram of an overpressure cut-off control system of an axial flow safety cut-off valve of the present application;
FIG. 4 is a block diagram of a multistage overpressure cut-off control system of an axial flow safety cut-off valve of the present application;
Reference numerals: 1. valve core sleeve, 2, balance hole, 3, inlet space, 4, valve rod, 5, valve core, 6, valve seat, 7, left valve body, 8, left space, 9, damping space, 10, reset spring, 11, valve position indicator, 12, piston sleeve runner hole, 13, right valve body overcoat, 14, piston sleeve, 15, right space, 16, piston, 17, right valve body inner sleeve, 18, outlet space, 19, breathing hole, 20, right valve body runner hole, 21, overpressure control valve, 22, signal medium hole, 23, instrument interface, 24, pressure regulator, 25, primary pressure regulator, 26, secondary pressure regulator, 27, primary overpressure control valve, 28, secondary overpressure control valve.
Detailed Description
Example 1
As a preferred embodiment of the present application, referring to fig. 1 and 2 of the specification, this embodiment discloses:
The axial-flow type safety cut-off valve comprises a left valve body 7, a right valve body, a valve seat 6, a valve core 5, a valve rod 4, a valve core sleeve 1, a piston sleeve 14 and a piston 16, wherein the right valve body comprises a right valve body inner sleeve 17 and a right valve body outer sleeve 13; the valve core 5, the valve rod 4 and the piston 16 form a power transmission mechanism; the left valve body 7, the valve seat 6 and the valve core 5 form an inlet space 3; the valve core 5 is slidably connected in the valve core sleeve 1, a left space 8 is formed by the valve core 5 and the inner side of the valve core sleeve 1, a damping space 9 is formed by the right side of the valve core sleeve 1, the inner side of the piston sleeve 14 and the left side of the piston 16, and a return spring 10 is arranged in the damping space 9; the piston sleeve 14 is provided with a breathing hole 19, and the breathing hole 19 communicates the damping space 9 with the outside; the left sides of the piston sleeve 14, the piston 16 and the right valve body inner sleeve 17 form a right space 15; the piston sleeve 14 is provided with a piston sleeve runner hole 12, and an outlet space 18 is formed by the interval between the inner side of the left valve body 7 and the outer side of the valve core sleeve 1, the interval between the piston sleeve runner hole 12, the right valve body runner hole 20, the right valve body inner sleeve 17 and the right valve body outer sleeve 13; the piston sleeve 14 is provided with a signal medium hole 22, and the signal medium hole 22 communicates the right space 15 with an instrument interface 23 arranged on the right valve body outer sleeve 13. The breathing holes 19 are arranged on the piston sleeve 14, so that the damping space 9 can breathe normally and cannot feel suffocating when working.
In addition, a window meeting the flow requirement is arranged on the valve core sleeve 1, and the window is used for communicating the inlet space 3 with the outlet space 18. The valve core 5 is provided with a balance hole 2, and the balance hole 2 can balance the pressure of the inlet space 3 and the left space 8. A valve position indicator 11 is installed at the instrument interface 23 and is used for displaying the opening or closing position of the valve core 5.
Example 2
As a further preferred embodiment of the present application, referring to fig. 3 and 4 of the specification, this embodiment discloses:
The overpressure cut-off control system of the axial flow type safety cut-off valve comprises the axial flow type safety cut-off valve and a plurality of overpressure control valves 21; in the present embodiment, the overpressure cut-off control system may be divided into a single overpressure cut-off mode and a multi-stage overpressure cut-off mode according to the number of the overpressure control valves 21.
As shown in fig. 3, the number of the overpressure control valves 21 is one, and the outlet of the overpressure control valve 21 is communicated with the right space 15 of the axial flow type safety cut-off valve, namely, the overpressure control valve is arranged at the instrument interface of the axial flow type safety cut-off valve; the inlet of the overpressure control valve is connected with a downstream outlet pipe. The inlet of the overpressure control valve is typically connected to the outlet conduit of the pressure regulator 24, but may be connected to any point in the downstream outlet conduit.
In the embodiment, the axial-flow type safety cut-off valve comprises a left valve body 7, a right valve body, a valve seat 6, a valve core 5, a valve rod 4, a valve core sleeve 1, a piston sleeve 14 and a piston 16, wherein the right valve body comprises a right valve body inner sleeve 17 and a right valve body outer sleeve 13; the valve core 5, the valve rod 4 and the piston 16 form a power transmission mechanism; the left valve body 7, the valve seat 6 and the valve core 5 form an inlet space 3; the valve core 5 is slidably connected in the valve core sleeve 1, a left space 8 is formed by the valve core 5 and the inner side of the valve core sleeve 1, a damping space 9 is formed by the right side of the valve core sleeve 1, the inner side of the piston sleeve 14 and the left side of the piston 16, and a return spring 10 is arranged in the damping space 9; the piston sleeve 14 is provided with a breathing hole 19, and the breathing hole 19 communicates the damping space 9 with the outside; the left sides of the piston sleeve 14, the piston 16 and the right valve body inner sleeve 17 form a right space 15; the piston sleeve 14 is provided with a piston sleeve runner hole 12, and an outlet space 18 is formed by the interval between the inner side of the left valve body 7 and the outer side of the valve core sleeve 1, the interval between the piston sleeve runner hole 12, the right valve body runner hole 20, the right valve body inner sleeve 17 and the right valve body outer sleeve 13; the piston sleeve 14 is provided with a signal medium hole 22, and the signal medium hole 22 communicates the right space 15 with an instrument interface 23 arranged on the right valve body outer sleeve 13.
In this embodiment, the overpressure control valve is a pneumatic controller disclosed in a patent document with publication number CN201462116U, named "a gas safety shut-off valve", and the structure is identical (the structure of the overpressure control valve is not separately listed in the present application). In addition, the overpressure control valve described in this embodiment does not refer specifically to the structure of the pneumatic controller disclosed in the patent document with publication number CN201462116U, entitled "a gas safety shut-off valve", as long as existing devices capable of realizing overpressure control are all within the scope of the overpressure control valve of the present application.
In this embodiment, the overpressure control valve may adopt a pilot valve structure disclosed in a patent document with publication number CN102147028a, entitled "low pressure pilot relief valve".
The working principle is as follows: when the axial-flow type safety cut-off valve is opened and normally works, the air inlet valve of the overpressure control valve 21 is normally opened, the drain valve is normally closed, and the valve core of the overpressure control valve is always in a closed sealing state under the action of the spring force of the second spring. Under the normal running condition of the axial flow type safety cut-off valve, the valve core of the overpressure control valve is in a closed state, no gas medium enters the right space 15, the medium pressure in the right space 15 is close to 0 value, the valve core of the axial flow type safety cut-off valve is always in an open state under the action of the medium pressure and the restoring spring, when the gas pressure of an outlet pipeline at the downstream of the system rises to a set cut-off pressure, the valve core of the overpressure control valve 21 is opened, the gas medium enters the right space 15 through a pressure guide pipe and a signal medium hole 22, and under the action of the acting force of the right space 15, the valve core 5 of the axial flow type safety cut-off valve is pushed by a power transmission mechanism to quickly move leftwards to contact with a valve seat 6 under the amplifying action of a piston 16 of the axial flow type safety cut-off valve, so that the paths of the inlet space 3 and the outlet space 18 are cut-off, and the axial flow type safety cut-off valve is quickly closed, and the air flow is cut off. The right space 15 is communicated with the upper end of the piston shaft rod through a small hole on the air inlet valve to generate back pressure, the pressure of a downstream pipeline is reduced after the axial flow type safety cut-off valve is cut off, the air inlet valve is closed, the drain valve is opened, air in the right space 15 of the axial flow type safety valve is discharged, then the drain valve is closed, the handle of the air inlet valve is opened, the valve core 5 of the axial flow type safety valve is separated from the valve seat 6 under the action of the reset spring 10, the inlet space 3 and the outlet space 18 are restored to be in a communicated state, and the safety cut-off valve is reset.
From outside, as shown in fig. 4, the number of the overpressure control valves 21 is two, namely a primary overpressure control valve 27 and a secondary overpressure control valve 28, the number of the pressure regulators is two, namely a primary pressure regulator 25 and a secondary pressure regulator 26, and outlets of the primary overpressure control valve 27 and the secondary overpressure control valve 28 are communicated with the right space 15 of the axial flow type safety cut-off valve; an inlet of the primary overpressure control valve 27 is connected with an outlet pipeline of the primary pressure regulator 25, and an inlet of the secondary overpressure control valve 28 is connected with an outlet pipeline of the secondary pressure regulator 26. In the embodiment, the pressure regulator is not a specific device, can be other parts in a gas pipeline, realizes the multistage control of the gas transmission pressure system, carries out the stage control on a downstream pipeline, can rapidly reflect the overpressure phenomenon at a certain downstream outlet pipeline to the axial flow type safety cut-off valve, carries out the cut-off control on the pipeline, enhances the safety of pipeline transmission, and is particularly suitable for large-flow transmission occasions such as natural gas long-distance transmission pipelines, branch transmission stations and the like.
In addition, a window meeting the flow requirement is arranged on the valve core sleeve 1, and the window is used for communicating the inlet space 3 with the outlet space 18. The valve core 5 is provided with a balance hole 2, and the balance hole 2 can balance the pressure of the inlet space 3 and the left space 8. A valve position indicator 11 is installed at the instrument interface 23 and is used for displaying the opening or closing position of the valve core 5.
Claims (10)
1. The axial-flow type safety stop valve comprises a left valve body (7) and a right valve body, and is characterized in that: the valve further comprises a valve seat (6), a valve core (5), a valve rod (4), a valve core sleeve (1), a piston sleeve (14) and a piston (16), wherein the right valve body comprises a right valve body inner sleeve (17) and a right valve body outer sleeve (13); the valve core (5), the valve rod (4) and the piston (16) form a power transmission mechanism; the left valve body (7), the valve seat (6) and the valve core (5) form an inlet space (3); the valve core (5) is slidably connected in the valve core sleeve (1), a left space (8) is formed between the valve core (5) and the inner side of the valve core sleeve (1), a damping space (9) is formed between the right side of the valve core sleeve (1), the inner side of the piston sleeve (14) and the left side of the piston (16), and a return spring (10) is arranged in the damping space (9); a breathing hole (19) is formed in the piston sleeve (14), and the breathing hole (19) is used for communicating the damping space (9) with the outside of the valve body; the left sides of the piston sleeve (14), the piston (16) and the right valve body inner sleeve (17) form a right space (15); the piston sleeve (14) is provided with a piston sleeve flow passage hole (12), and an outlet space (18) is formed by the interval between the inner side of the left valve body (7) and the outer side of the valve core sleeve (1), the interval between the piston sleeve flow passage hole (12), the right valve body flow passage hole (20) and the interval between the right valve body inner sleeve (17) and the right valve body outer sleeve (13); a signal medium hole (22) is formed in the piston sleeve (14), and the signal medium hole (22) is used for communicating the right space (15) with an instrument interface (23) arranged on the right valve body outer sleeve (13); if the downstream pipeline is overpressured, an overpressure control medium enters the right space (15) through the instrument interface (23) and the signal medium hole (22), the control medium thrust is amplified through the piston (16), the valve core (5) is pushed by the power transmission mechanism to move leftwards to contact the valve seat (6), and the passages of the inlet space (3) and the outlet space (18) are cut off.
2. The axial flow type safety shut-off valve according to claim 1, wherein: the valve core sleeve (1) is provided with a window meeting the flow requirement, and the window is used for communicating the inlet space (3) and the outlet space (18).
3. The axial flow type safety shut-off valve according to claim 1, wherein: the valve core (5) is provided with a balance hole (2), and the balance hole (2) is used for balancing the pressure of the inlet space (3) and the left space (8).
4. The axial flow type safety shut-off valve according to claim 1, wherein: and a valve position indicator (11) is arranged at the instrument interface (23) and is used for displaying the opening or closing position of the valve core (5).
5. The utility model provides an superpressure of axial-flow type safety stop valve cuts control system which characterized in that: comprises an axial flow type safety cut-off valve and a plurality of overpressure control valves (21);
the axial-flow type safety cut-off valve comprises a left valve body (7), a right valve body, a valve seat (6), a valve core (5), a valve rod (4), a valve core sleeve (1), a piston sleeve (14) and a piston (16), wherein the right valve body comprises a right valve body inner sleeve (17) and a right valve body outer sleeve (13); the valve core (5), the valve rod (4) and the piston (16) form a power transmission mechanism; the left valve body (7), the valve seat (6) and the valve core (5) form an inlet space (3); the valve core (5) is slidably connected in the valve core sleeve (1), a left space (8) is formed between the valve core (5) and the inner side of the valve core sleeve (1), a damping space (9) is formed between the right side of the valve core sleeve (1), the inner side of the piston sleeve (14) and the left side of the piston (16), and a return spring (10) is arranged in the damping space (9); a breathing hole (19) is formed in the piston sleeve (14), and the breathing hole (19) is used for communicating the damping space (9) with the outside of the valve body; the left sides of the piston sleeve (14), the piston (16) and the right valve body inner sleeve (17) form a right space (15); the piston sleeve (14) is provided with a piston sleeve flow passage hole (12), and an outlet space (18) is formed by the interval between the inner side of the left valve body (7) and the outer side of the valve core sleeve (1), the interval between the piston sleeve flow passage hole (12), the right valve body flow passage hole (20) and the interval between the right valve body inner sleeve (17) and the right valve body outer sleeve (13); a signal medium hole (22) is formed in the piston sleeve (14), and the signal medium hole (22) is used for communicating the right space (15) with an outlet of the overpressure control valve (21);
The overpressure control valves (21) are connected with the axial flow type safety cut-off valve, and outlets of the overpressure control valves are communicated with the right space (15) of the axial flow type safety cut-off valve; an inlet of the overpressure control valve is connected with a downstream outlet pipeline; when the gas pressure of the downstream outlet pipeline of the system is increased to the set cut-off pressure, the valve core of the overpressure control valve is opened, a gas medium enters the right space (15) through the signal medium hole (22), and under the action of the right space (15), the valve core (5) of the axial flow type safety cut-off valve is pushed by the power transmission mechanism to move leftwards to contact the valve seat (5) under the amplification action of the piston (16) of the axial flow type safety cut-off valve, so that the passages of the inlet space (3) and the outlet space (18) are cut off, the axial flow type safety cut-off valve is closed, and the gas flow is cut off.
6. The overpressure cut-off control system of an axial flow safety cut-off valve according to claim 5, wherein: the pressure regulator is characterized by further comprising a plurality of pressure regulators (24), wherein one overpressure control valve (21) corresponds to one pressure regulator (24), the outlet of the overpressure control valve (21) is communicated with the right space (15) of the axial flow type safety cut-off valve, and the inlet of the overpressure control valve is connected with the outlet pipeline of the corresponding pressure regulator (24).
7. The overpressure cut-off control system of an axial flow safety cut-off valve according to claim 6, wherein: the number of the overpressure control valves (21) is one, the number of the pressure regulators (24) is one, and the outlet of the overpressure control valves (21) is communicated with the right space (15) of the axial flow type safety cut-off valve; the inlet of the overpressure control valve (21) is connected with the outlet pipeline of the pressure regulator (24).
8. The overpressure cut-off control system of an axial flow safety cut-off valve according to claim 6, wherein: the number of the overpressure control valves (21) is two, namely a primary overpressure control valve (27) and a secondary overpressure control valve (28), the number of the pressure regulators (24) is two, namely a primary pressure regulator (25) and a secondary pressure regulator (26), and the outlets of the primary overpressure control valve (27) and the secondary overpressure control valve (28) are communicated with the right space (15) of the axial flow type safety shut-off valve; an inlet of the primary overpressure control valve (27) is connected with an outlet pipeline of the primary pressure regulator (25), and an inlet of the secondary overpressure control valve (28) is connected with an outlet pipeline of the secondary pressure regulator (26).
9. The overpressure cut-off control system of an axial flow safety cut-off valve according to claim 5, wherein: the valve core sleeve (1) is provided with a window meeting the flow requirement, and the window is used for communicating the inlet space (3) and the outlet space (18).
10. The overpressure cut-off control system of an axial flow safety cut-off valve according to claim 5, wherein: the valve core (5) is provided with a balance hole (2), and the balance hole (2) is used for balancing the pressure of the inlet space (3) and the left space (8).
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| CN201810769114.0A CN108716558B (en) | 2018-07-13 | 2018-07-13 | Axial flow type safety cut-off valve and overpressure cut-off control system thereof |
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| CN201810769114.0A CN108716558B (en) | 2018-07-13 | 2018-07-13 | Axial flow type safety cut-off valve and overpressure cut-off control system thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US11920688B2 (en) | 2019-09-25 | 2024-03-05 | Fisher Jeon Gas Equipment (Chengdu) Co., Ltd. | Modular valve system |
| CN111518597B (en) * | 2020-05-06 | 2021-10-15 | 长沙宁湖机械设备有限公司 | Be used for multistage accuse depressor of natural gas recovery |
| CN112762220B (en) * | 2020-12-25 | 2022-03-18 | 华中科技大学 | Rapid valve opening and closing device and method for large-diameter wind tunnel application |
| CN112797207B (en) * | 2021-03-01 | 2022-09-06 | 四川长仪油气集输设备股份有限公司 | Pilot-operated pipeline explosion positive and negative action axial flow type self-closing valve |
| CN114215946B (en) * | 2021-12-17 | 2023-12-26 | 南通市电站阀门有限公司 | Axial-flow type dynamic self-balancing regulating valve |
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