CN107366766B - Double-control angle type safety valve - Google Patents
Double-control angle type safety valve Download PDFInfo
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- CN107366766B CN107366766B CN201710808615.0A CN201710808615A CN107366766B CN 107366766 B CN107366766 B CN 107366766B CN 201710808615 A CN201710808615 A CN 201710808615A CN 107366766 B CN107366766 B CN 107366766B
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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
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
- F16K17/168—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side combined with manually-controlled valves, e.g. a valve combined with a safety valve
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Abstract
The invention discloses a double-control angle type safety valve, which aims to solve the problems that when an electric control valve fails in power failure, the electric control valve cannot normally open for pressure relief, so that the system is damaged due to overhigh pressure in the system, and even safety accidents are caused. The invention comprises a main valve, a mechanical pilot valve and an electric control valve, wherein the lower end of the main valve is provided with a main valve inlet, the side edge of the main valve is provided with a main valve outlet, the main valve inlet and the main valve outlet form an angle structure, a guide sleeve is arranged in the main valve, a main valve clack is arranged in the guide sleeve, a main valve cavity is formed above the main valve clack in the guide sleeve, a pressure inlet cavity and a pressure relief cavity are arranged in the mechanical pilot valve, the electric control valve is provided with a pressure inlet hole, a pressure outlet hole and a pressure discharge hole, the main valve inlet is communicated with a pipeline between the pressure inlet cavity and the pressure inlet cavity, the pressure outlet hole is communicated with a pipeline between the main valve cavity, the pressure discharge hole is communicated with a pipeline between the pressure inlet hole and the pressure outlet cavity, the pressure discharge hole is in a normally-open state, and the pressure discharge hole is in a normally-closed state.
Description
Technical Field
The present invention relates to a safety valve, and more particularly, to a double control angle type safety valve.
Background
The safety valve is widely used in various fields of industrial production, plays a good protection role on the system, and is opened to release pressure when the pressure of the system exceeds the set pressure, so that the pressure in the system is prevented from continuously rising to damage the system and even cause safety accidents, and the safety valve returns to a seat after the pressure of the system is reduced to prevent continuous discharge of media in the system. In order to facilitate accurate control, an electric control valve is usually adopted to control the system pressure at present, the electric control valve receives remote DCS valve opening and closing signals, but the electric control valve is not powered off, and when a power failure occurs, the electric control valve cannot be normally opened for pressure relief, so that the system pressure is too high to damage the system, and even safety accidents are caused.
Disclosure of Invention
The invention overcomes the defects that when the electric control valve fails in power failure, the electric control valve cannot normally open for pressure relief, so that the system is damaged due to overhigh pressure in the system, and even safety accidents are caused; the safety valve is not required to be stopped in the maintenance process, so that normal industrial production is ensured, and economic loss is avoided.
In order to solve the technical problems, the invention adopts the following technical scheme: the utility model provides a dual control angle type relief valve, including the main valve, machinery pilot valve, electric control valve, the main valve lower extreme is equipped with the main valve entry, the main valve side is equipped with the main valve export, main valve entry and main valve export constitute angle formula structure, install the uide bushing in the main valve, install main valve clack in the uide bushing, main valve cavity is constituteed to main valve clack top in the uide bushing, be equipped with into the pressure chamber in the machinery pilot valve, the pressure chamber is released, be equipped with into the pressure hole on the electric control valve, go out the pressure hole, pipeline intercommunication between main valve entry and the pressure chamber, pipeline intercommunication between pressure hole and the pressure chamber is advanced, pipeline intercommunication between pressure hole and the main valve export is in normal open state between pressure hole and the pressure hole, the pressure hole is in normal close state to the pressure hole, electric control valve's automatically controlled opening pressure is less than the opening pressure of machinery pilot valve.
When the double-control angle type safety valve is used, medium enters from the inlet of the main valve and enters the cavity of the main valve along the pipeline through the mechanical pilot valve and the electric control valve, so that the main valve is in a closed state. When the control center detects that the system pressure rises to a set value (such as 0.6 MPaA), a valve opening signal is sent to enable the electric control valve to be opened, at the moment, the pressure inlet hole of the electric control valve is closed, the pressure outlet hole is opened, the pressure outlet hole is communicated with the pressure outlet hole, medium is discharged from the main valve chamber to the main valve outlet along a pipeline through the electric control valve, the pressure in the main valve chamber is rapidly reduced, and the main valve flap moves upwards to open the main valve for pressure relief. When the control center sends out a valve closing signal to close the electric control valve, medium entering along the pipeline at the inlet of the main valve is replenished into the main valve cavity, so that the main valve is closed. When the control center fails or fails, even if the pressure of the system rises to a set value (such as 0.6 MPaA), the electric control valve can not be opened, when the pressure in the system continues to rise to the set pressure of the mechanical pilot valve (such as 0.65 MPaA), the mechanical pilot valve is automatically opened, a medium flows from the main valve chamber to the pressure inlet cavity of the mechanical pilot valve along a pipeline through the electric control valve, finally flows through the pressure release cavity to release pressure outwards, the pressure in the main valve chamber is reduced, the main valve is opened to release pressure, the mechanical pilot valve is automatically closed after the pressure of the system is reduced to the pressure below the pressure of the pilot valve backseat, and the medium is replenished to the main valve chamber to enable the main valve to be closed. The double-control angle type safety valve is controlled by the electric control valve and the mechanical pilot valve, and can normally open and release pressure even if a power failure occurs in the main valve, so that the safety pressure in the system is ensured, the system is prevented from being damaged due to overhigh pressure in the system, and safety accidents caused by overhigh pressure in the system are avoided.
Preferably, normally open bypass valves in normally open states are arranged on pipelines between the main valve inlet and the pressure inlet cavity, between the pressure inlet hole and the pressure inlet cavity, between the pressure outlet hole and the main valve chamber and between the pressure exhaust hole and the main valve outlet, bypass pipes are connected between the main valve chamber and the mechanical pilot valve pressure inlet cavity and between the electric control valve pressure inlet hole and the main valve inlet, and normally closed bypass valves in normally closed states are arranged on the bypass pipes.
The double-control angle type safety valve can be overhauled without stopping, when the electric control valve is overhauled on line, the normally open bypass valve connected with the electric control valve is closed, the normally closed bypass valve on the bypass pipe between the main valve cavity and the mechanical pilot valve pressure inlet cavity is opened, the mechanical pilot valve works independently at the moment, the electric control valve can be overhauled and replaced on line, after the operation is finished, the normally open bypass valve is fully opened, and the normally closed bypass valve is fully closed, so that the safety valve is restored to a normal state. Similarly, when the mechanical pilot valve is overhauled, the normally open bypass valve connected with the mechanical pilot valve is closed, the normally closed bypass valve on the bypass pipe between the pressure inlet hole of the electric control valve and the inlet of the main valve is opened, and at the moment, the electric control valve works independently, so that the mechanical pilot valve can be overhauled and replaced on line, and after the operation is finished, the normally open bypass valve is fully opened, and the normally closed bypass valve is fully closed, so that the safety valve is restored to a normal state. The safety valve is not required to be stopped in the maintenance process, so that normal industrial production is ensured, and economic loss is avoided.
Preferably, a check valve is mounted on the conduit between the relief orifice and the main valve outlet. The check valve prevents the backflow phenomenon of the medium.
Preferably, the electric control valve comprises a valve body, a valve cover, a valve rod and an electric actuator for pushing the valve rod to move up and down, wherein a partition plate is arranged in the valve body, an upper valve hole is formed in the partition plate, an upper valve cavity communicated with a pressure inlet hole is formed in the upper part of the partition plate in the valve body, a lower valve cavity communicated with a pressure outlet hole is formed in the lower part of the partition plate in the valve body, the lower end of the valve body is connected with a valve seat, a lower valve hole communicated with the lower valve cavity is formed in the valve seat, the lower valve hole is communicated with a pressure discharge hole, the lower end of the valve rod is connected with a valve clack, the valve clack comprises an upper sealing section and a lower sealing section, the upper sealing section and the lower sealing section are both in cone structures, the side walls of the upper sealing section and the lower sealing section are sealing surfaces which are obliquely arranged, the opening position of the upper end of the upper valve hole is in cone structures matched with the upper sealing section, the sealing surface of the lower sealing section is in a sealing fit with the opening edge of the lower valve hole, the upper end of the valve rod penetrates through the valve cover and is connected with the electric actuator, and packing between the valve rod and the valve cover is sealed.
The lower seal section butt of valve clack is on lower valve opening under the initial condition, and the pressure hole is closed to the row, and pressure hole and play are pressed the hole through last valve opening intercommunication, and electric control valve opens the back, and the valve clack upwards moves, makes the sealed face on the upper seal section and go up valve opening closely butt, and last valve opening is closed, and play presses the hole and row presses the hole intercommunication, and the medium of being convenient for is followed the pipeline along the electric control valve and is discharged into main valve export from main valve cavity. The upper sealing section and the lower sealing section are of conical structures, which is beneficial to improving the sealing effect. The packing seal has good sealing effect and ensures the sealing performance in the lifting process of the valve rod. The electric control valve with the structure has good sealing effect and is convenient to open and close.
Preferably, the upper end of the valve clack is provided with a mounting groove, the bottom surface of the mounting groove is of a spherical structure, the bottom surface of the mounting groove is movably provided with a universal ball, the lower end of the valve rod is fixedly connected with the universal ball, and a limiting sleeve for vertically limiting the universal ball is connected in the mounting groove. The valve clack and the valve rod can rotate within a certain angle range, so that self-centering operation can be realized in the process of abutting and sealing the valve clack and the upper valve hole or the lower valve hole, and the sealing effect is guaranteed. The limiting sleeve plays a good vertical limiting role on the universal ball.
Preferably, an emergency pressure release seat is hermetically connected between the valve cover and the valve body, a plurality of emergency pressure release cavities are uniformly distributed on the emergency pressure release seat, a plurality of vertically penetrating piston cavities are correspondingly arranged on the valve cover and the emergency pressure release cavities one by one, the lower ends of the piston cavities are communicated with the emergency pressure release cavities, pistons are arranged in the piston cavities, push rods are connected to the pistons, the upper ends of the push rods extend out of the valve cover, a push sleeve is fixedly connected to the valve rods, a push ring is movably sleeved outside the push sleeve, the outer wall of the push sleeve and the inner wall of the push ring are obliquely arranged from bottom to top, the upper ends of the push rods are connected to the push ring, an emergency valve hole communicated with the emergency pressure release cavities is arranged at the lower end of the emergency pressure release seat, an emergency valve rod is installed in the emergency pressure release cavities in a liftable manner, the lower ends of the emergency valve rod is connected with an emergency valve clack, a setting spring is sleeved on the emergency valve rod in a sealing manner at the upper end of the emergency valve hole, and the opening pressure of the emergency valve clack is larger than the opening pressure of a machine; a plurality of air bags filled with air are arranged above the push ring, color powder is filled in the air bags, and a plurality of poking needles capable of poking the air bags are arranged on the push ring.
When the control center fails or fails and the mechanical pilot valve fails, even if the system pressure rises to a set value (such as 0.65 MPaA) of the mechanical pilot valve, the mechanical pilot valve cannot be opened, the pressure in the system continues to rise to the opening pressure (such as 0.7 MPaA) of the emergency valve clack, at the moment, a medium passes through the emergency valve hole and the emergency pressure release cavity from the upper valve cavity to enter the piston cavity, the high-pressure medium pushes the piston to move upwards, so that the push rod drives the push ring to move upwards, the inner wall of the inclined surface of the push ring is attached to the outer wall of the inclined surface of the push sleeve and drives the push sleeve to move upwards, the valve rod moves upwards, the electric control valve is opened, the pressure in the main valve cavity drops rapidly, and the main valve clack is opened to release pressure. The poking needle punctures the air bag in the process of pushing the ring to rise, colored gas is sprayed into the air bag, a personnel system is reminded of faults, and measures are convenient to take in time. The structure increases a protective measure for the whole system, so that the system is in a three-insurance state, and even if the control center and the mechanical pilot valve simultaneously fail, the system can be subjected to emergency pressure relief, the system is prevented from being damaged due to overhigh pressure in the system, and safety accidents caused by overhigh pressure in the system are avoided. And the control center and the mechanical pilot valve can be found in time when faults occur at the same time, so that measures can be taken in time conveniently.
Preferably, the left side and the right side of the valve body are respectively connected with a left joint and a right joint, the left joint and the right joint are of T-shaped structures, the outer ends of the left joint and the right joint are respectively sleeved with a connecting flange, a pressure inlet hole is formed in the right joint, and a pressure outlet hole is formed in the left joint. The pressure inlet hole and the pressure outlet hole of the valve body are connected with the pipeline conveniently and reliably.
Preferably, the valve cover is sleeved with a plurality of cooling fins. The radiating fin is favorable for radiating the electric control valve, and the safety performance of the electric control valve is improved.
Compared with the prior art, the invention has the beneficial effects that: (1) The double-control angle type safety valve is controlled by the electric control valve and the mechanical pilot valve, and can normally open and release pressure even if a power failure occurs in the main valve, so that the safety pressure in the system is ensured, the system is prevented from being damaged due to overhigh pressure in the system, and safety accidents caused by overhigh pressure in the system are avoided; (2) The safety valve is not required to be stopped in the maintenance process, so that normal industrial production is ensured, and economic loss is avoided; (3) Even if the control center and the mechanical pilot valve are simultaneously failed, the emergency pressure relief can be carried out on the system, the system is prevented from being damaged due to the fact that the pressure in the system is too high, safety accidents caused by the fact that the pressure in the system is too high are avoided, and the control center and the mechanical pilot valve can be timely found when the control center and the mechanical pilot valve are simultaneously failed, so that measures can be conveniently taken in time.
Drawings
FIG. 1 is a schematic view of a construction of the present invention;
FIG. 2 is a cross-sectional view of a main valve of the present invention;
FIG. 3 is a schematic view of the structure of the electric control valve of the present invention;
FIG. 4 is a schematic diagram of the piping of the system of the present invention in its normal operating condition;
FIG. 5 is a schematic diagram of the piping for servicing the electrically operated valve of the present invention;
FIG. 6 is a schematic diagram of the piping for the maintenance of the mechanical pilot valve of the present invention;
in the figure: 1. a main valve, 2, a mechanical pilot valve, 3, an electric control valve, 4, a main valve inlet, 5, a main valve outlet, 6, a guide sleeve, 7, a main valve clack, 8, a main valve chamber, 9, an inlet pressure chamber, 10, a pressure relief chamber, 11, an inlet pressure hole, 12, an outlet pressure hole, 13, a discharge pressure hole, 14, a normally open bypass valve, 15, a bypass pipe, 16, a normally closed bypass valve, 17, a check valve, 18, a valve body, 19, a valve cover, 20, a valve rod, 21, an electric actuator, 22, a partition plate, 23, an upper valve hole, 24, an upper valve cavity, 25, a lower valve cavity, 26, a valve seat, 27, a lower valve hole, 28, a valve clack, 29, a sealing surface, 30, mounting grooves, 31, universal balls, 32, limiting sleeves, 33, emergency pressure relief seats, 34, emergency pressure relief cavities, 35, piston cavities, 36, pistons, 37, push rods, 38, push sleeves, 39, push rings, 40, emergency valve holes, 41, emergency valve rods, 42, emergency valve flaps, 43, setting springs, 44, mounting sleeves, 45, fixing frames, 46, rotating wheels, 47, blades, 48, generator magnetic pole rotors, 49, generator coil stators, 50, left joints, 51, right joints, 52, flanges, 53, radiating fins, 54, positioning sleeves, 55, air bags, 56 and poking pins; f1 and F4 are normally closed bypass valves, and F2, F3, F5 and F6 are normally open bypass valves.
Detailed Description
The technical scheme of the invention is further specifically described by the following specific embodiments with reference to the accompanying drawings:
examples: a double-control angle type safety valve (see figures 1 to 6) comprises a main valve 1, a mechanical pilot valve 2 and an electric control valve 3, wherein a main valve inlet 4 is arranged at the lower end of the main valve, a main valve outlet 5 is arranged on the right side edge of the main valve, the axis of the main valve inlet and the axis of the main valve outlet are vertically arranged, the main valve inlet and the main valve outlet form an angle type structure, a guide sleeve 6 is arranged in the main valve, a main valve clack 7 is arranged in the guide sleeve, and a main valve cavity 8 is formed above the main valve clack in the guide sleeve. A valve seat is arranged in the main valve close to the lower end, an inlet of the main valve is communicated with the valve seat, and a main valve flap is in sealing abutting connection with the valve seat. The mechanical pilot valve is internally provided with a pressure inlet cavity 9 and a pressure release cavity 10, the electric control valve is provided with a pressure inlet hole 11, a pressure outlet hole 12 and a pressure discharge hole 13, the main valve inlet is communicated with the pressure inlet cavity through a pipeline, the pressure inlet hole is communicated with the pressure inlet cavity through a pipeline, the pressure outlet hole is communicated with the main valve cavity through a pipeline, the pressure discharge hole is communicated with the main valve outlet through a pipeline, the pressure inlet hole and the pressure outlet hole are in a normally-on state, the pressure discharge hole is in a normally-off state, and the electric control opening pressure of the electric control valve is smaller than the opening pressure of the mechanical pilot valve. Normally open bypass valves 14 in normally open states are arranged on the pipelines between the main valve inlet and the pressure inlet cavity, between the pressure inlet hole and the pressure inlet cavity, between the pressure outlet hole and the main valve chamber and between the pressure outlet hole and the main valve outlet, bypass pipes 15 are connected between the main valve chamber and the mechanical pilot valve pressure inlet cavity and between the electric control valve pressure inlet hole and the main valve inlet, and normally closed bypass valves 16 in normally closed states are arranged on the bypass pipes. A check valve 17 is mounted on the conduit between the discharge orifice and the main valve outlet.
The electric control valve comprises a valve body 18, a valve cover 19, a valve rod 20 and an electric actuator 21 for pushing the valve rod to move up and down, wherein a partition 22 is arranged in the valve body, an upper valve hole 23 is formed in the partition, the valve rod penetrates through the upper valve hole, and an overflow gap is formed between the outer wall of the valve rod and the inner wall of the upper valve hole. An upper valve cavity 24 communicated with a pressure inlet hole is arranged above a partition plate in the valve body, a lower valve cavity 25 communicated with a pressure outlet hole is arranged below the partition plate in the valve body, the lower end of the valve body is connected with a valve seat 26, a lower valve hole 27 communicated with the lower valve cavity is arranged on the valve seat, the lower valve hole is communicated with the pressure outlet hole, the lower end of the valve rod is connected with a valve clack 28, the valve clack comprises an upper sealing section and a lower sealing section, the upper sealing section and the lower sealing section are both in conical structures, the side walls of the upper sealing section and the lower sealing section are sealing surfaces 29 which are obliquely arranged, the opening position of the lower end of the upper valve hole is in a conical structure matched with the upper sealing section, the opening position of the upper end of the lower valve hole is in a conical structure matched with the lower sealing section, the sealing surface of the lower sealing section is in sealing fit with the opening edge of the upper end of the lower valve hole, the upper end of the valve rod penetrates through a valve cover and is connected with an electric actuator, and packing is sealed between the valve rod and the valve cover. The upper end of the valve cover is connected with a positioning sleeve 54 which is abutted on the packing seal. The valve clack upper end is equipped with mounting groove 30, and mounting groove bottom surface balling structure, mounting groove bottom surface movable mounting has universal ball 31, valve rod lower extreme and universal ball fixed connection, and the mounting groove internal connection has the stop collar 32 that is used for vertical spacing universal ball. The valve cover and the valve body are hermetically connected with an emergency pressure release seat 33, a plurality of emergency pressure release cavities 34 are uniformly distributed on the emergency pressure release seat, a plurality of vertically penetrating piston cavities 35 are correspondingly arranged on the valve cover and the emergency pressure release cavities one by one, the lower ends of the piston cavities are communicated with the emergency pressure release cavities, pistons 36 are arranged in the piston cavities, push rods 37 are connected to the pistons, the upper ends of the push rods extend out of the valve cover, push sleeves 38 are fixedly connected to the valve rods, push rings 39 are movably sleeved outside the push sleeves, the outer walls of the push sleeves and the inner walls of the push rings are obliquely arranged from bottom to top, the upper ends of the push rods are connected to the push rings, emergency valve holes 40 communicated with the emergency pressure release cavities are arranged at the lower ends of the emergency pressure release seats, emergency valve rods 41 are arranged in the emergency pressure release cavities in a lifting manner, emergency valve flaps 42 are connected to the lower ends of the emergency valve rods, setting springs 43 are sleeved on the emergency valve rods in a sleeved mode, the emergency valve flaps are in a sealing mode and are abutted to the upper ends of the emergency valve holes, and the opening pressure of the emergency valve flaps is larger than that of the mechanical pilot valves; a plurality of air bags 55 filled with air are arranged above the push ring, color powder is arranged in the air bags, and a plurality of poking needles 56 capable of poking the air bags are arranged on the push ring. The main valve outlet position is provided with a mounting sleeve 44, a fixing frame 45 is arranged in the mounting sleeve, a runner 46 which is pushed by a medium to rotate is arranged in the middle of the fixing frame, a plurality of blades 47 are uniformly distributed on the runner, the outer ends of the blades are connected with a generator magnetic pole rotor 48, a generator coil stator 49 is fixedly arranged on the inner wall of the mounting sleeve, the generator magnetic pole rotor is movably arranged between the generator coil stator and the inner wall of the mounting sleeve, the output end of the generator coil stator is electrically connected with an indicator lamp, and the indicator lamp is arranged on the outer wall of the main valve. The left and right sides of the valve body are respectively connected with a left joint 50 and a right joint 51, the left joint and the right joint are of T-shaped structures, the outer ends of the left joint and the right joint are respectively sleeved with a connecting flange 52, a pressure inlet is formed in the right joint, and a pressure outlet is formed in the left joint. The valve cover is sleeved with a plurality of cooling fins 53.
When the double-control angle type safety valve is used, medium enters from the inlet of the main valve and enters the cavity of the main valve along the pipeline through the mechanical pilot valve and the electric control valve, so that the main valve is in a closed state. When the control center detects that the system pressure rises to a set value (such as 0.6 MPaA), a valve opening signal is sent to enable the electric control valve to be opened, at the moment, the pressure inlet hole of the electric control valve is closed, the pressure outlet hole is opened, the pressure outlet hole is communicated with the pressure outlet hole, medium is discharged from the main valve chamber to the main valve outlet along a pipeline through the electric control valve, the pressure in the main valve chamber is rapidly reduced, and the main valve flap moves upwards to open the main valve for pressure relief. When the control center sends out a valve closing signal to close the electric control valve, medium entering along the pipeline at the inlet of the main valve is replenished into the main valve cavity, so that the main valve is closed. When the control center fails or fails, even if the pressure of the system rises to a set value (such as 0.6 MPaA), the electric control valve can not be opened, when the pressure in the system continues to rise to the set pressure of the mechanical pilot valve (such as 0.65 MPaA), the mechanical pilot valve is automatically opened, a medium flows from the main valve chamber to the pressure inlet cavity of the mechanical pilot valve along a pipeline through the electric control valve, finally flows through the pressure release cavity to release pressure outwards, the pressure in the main valve chamber is reduced, the main valve is opened to release pressure, the mechanical pilot valve is automatically closed after the pressure of the system is reduced to the pressure below the pressure of the pilot valve backseat, and the medium is replenished to the main valve chamber to enable the main valve to be closed. When the control center fails or fails and the mechanical pilot valve fails, even if the system pressure rises to a set value (such as 0.65 MPaA) of the mechanical pilot valve, the mechanical pilot valve cannot be opened, the pressure in the system continues to rise to the opening pressure (such as 0.7 MPaA) of the emergency valve clack, at the moment, a medium passes through the emergency valve hole and the emergency pressure release cavity from the upper valve cavity to enter the piston cavity, the high-pressure medium pushes the piston to move upwards, so that the push rod drives the push ring to move upwards, the inner wall of the inclined surface of the push ring is attached to the outer wall of the inclined surface of the push sleeve and drives the push sleeve to move upwards, the valve rod moves upwards, the electric control valve is opened, the pressure in the main valve cavity drops rapidly, and the main valve clack is opened to release pressure. The poking needle punctures the air bag in the process of pushing the ring to rise, colored gas is sprayed into the air bag, a personnel system is reminded of faults, and measures are convenient to take in time.
The double-control angle type safety valve can be overhauled without stopping, when the electric control valve is overhauled on line, the normally open bypass valve connected with the electric control valve is closed, namely, the normally open bypass valves F3, F5 and F6 are closed, the normally closed bypass valve F1 is closed, the normally closed bypass valve F4 on the bypass pipe between the main valve cavity and the mechanical pilot valve pressure inlet cavity is opened, the normally open bypass valve F2 is in an open state, the mechanical pilot valve works independently at the moment, the electric control valve can be overhauled and replaced on line, the normally open bypass valves F2, F3, F5 and F6 are all opened after the operation is finished, and the normally closed bypass valves F1 and F4 are all closed, so that the safety valve is restored to a normal state. Similarly, when the mechanical pilot valve is overhauled, normally-open bypass valves F2 and F3 connected with the mechanical pilot valve are closed, the normally-closed bypass valve F4 is in a closed state, the normally-closed bypass valve F1 on a bypass pipe between a pressure inlet hole of the electric control valve and a main valve inlet is opened, the normally-open bypass valves F5 and F6 are in an open state, the electric control valve independently works at the moment, the mechanical pilot valve can be overhauled and replaced on line, and after the operation is finished, the normally-open bypass valves F2, F3, F5 and F6 are all opened, and the normally-closed bypass valves F1 and F4 are all closed, so that the safety valve is restored to a normal state. The safety valve is not required to be stopped in the maintenance process, so that normal industrial production is ensured, and economic loss is avoided.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (7)
1. The double-control angle type safety valve is characterized by comprising a main valve, a mechanical pilot valve and an electric control valve, wherein a main valve inlet is arranged at the lower end of the main valve, a main valve outlet is arranged at the side edge of the main valve, an angle type structure is formed by the main valve inlet and the main valve outlet, a guide sleeve is arranged in the main valve, a main valve clack is arranged in the guide sleeve, a main valve cavity is formed above the main valve clack in the guide sleeve, a pressure inlet cavity and a pressure release cavity are arranged in the mechanical pilot valve, a pressure inlet hole, a pressure outlet hole and a pressure release hole are arranged on the electric control valve, a pipeline between the main valve inlet and the pressure inlet cavity is communicated, a pipeline between the pressure inlet hole and the pressure inlet cavity is communicated, a pipeline between the pressure release hole and the main valve outlet is communicated, the pressure release hole is in a normally-closed state, and the electric control opening pressure of the electric control valve is smaller than the opening pressure of the mechanical pilot valve; the electric control valve comprises a valve body, a valve cover, a valve rod and an electric actuator for pushing the valve rod to move up and down, wherein a partition plate is arranged in the valve body, an upper valve hole is formed in the partition plate, an upper valve cavity communicated with a pressure inlet hole is formed above the partition plate in the valve body, a lower valve cavity communicated with a pressure outlet hole is formed below the partition plate in the valve body, the lower end of the valve body is connected with a valve seat, a lower valve hole communicated with the lower valve cavity is formed in the valve seat, the lower valve hole is communicated with a pressure outlet hole, the lower end of the valve rod is connected with a valve clack, the valve clack comprises an upper sealing section and a lower sealing section, the upper sealing section and the lower sealing section are both in cone-shaped structures, the side walls of the upper sealing section and the lower sealing section are obliquely arranged, the opening position of the lower end of the upper valve hole is in cone-shaped structures matched with the upper sealing section, the sealing surface of the lower sealing section is in sealing fit with the opening edge of the lower valve hole, the upper end of the valve rod penetrates through the valve cover and is connected with the electric actuator, and packing between the valve rod and the valve cover is sealed; a valve seat is arranged in the main valve close to the lower end, an inlet of the main valve is communicated with the valve seat, and a main valve flap is in sealing abutting connection with the valve seat.
2. The double control angle type safety valve according to claim 1, wherein normally open bypass valves in normally open states are arranged on a pipeline between a main valve inlet and a pressure inlet cavity, a pipeline between a pressure inlet hole and the pressure inlet cavity, a pipeline between a pressure outlet hole and a main valve chamber and a pipeline between a pressure discharge hole and a main valve outlet, bypass pipes are connected between the main valve chamber and the pressure inlet cavity of the mechanical pilot valve and between the pressure inlet hole of the electric control valve and the main valve inlet, and normally closed bypass valves in normally closed states are arranged on the bypass pipes.
3. The dual control angle relief valve according to claim 1 wherein a check valve is mounted on the conduit between the relief orifice and the main valve outlet.
4. The double control angle type safety valve according to claim 1, wherein the upper end of the valve clack is provided with a mounting groove, the bottom surface of the mounting groove is of a spherical structure, the bottom surface of the mounting groove is movably provided with a universal ball, the lower end of the valve rod is fixedly connected with the universal ball, and a limiting sleeve for vertically limiting the universal ball is connected in the mounting groove.
5. The double-control angle type safety valve according to claim 1, wherein an emergency pressure relief seat is hermetically connected between the valve cover and the valve body, a plurality of emergency pressure relief cavities are uniformly distributed on the emergency pressure relief seat, a plurality of vertically through piston cavities are arranged on the valve cover and the emergency pressure relief cavities in a one-to-one correspondence manner, the lower ends of the piston cavities are communicated with the emergency pressure relief cavities, pistons are arranged in the piston cavities, push rods are connected to the pistons, the upper ends of the push rods extend out of the valve cover, a push sleeve is fixedly connected to the valve rods, a push ring is movably sleeved outside the push sleeve, the outer wall of the push sleeve and the inner wall of the push ring are obliquely arranged from bottom to top, the upper ends of the push rods are connected to the push ring, an emergency valve hole communicated with the emergency pressure relief cavities is arranged at the lower ends of the emergency pressure relief seats, emergency valve rods are installed in a liftable manner, emergency valve holes are sleeved with setting springs, the emergency valve holes are in a sealing manner and are abutted to the upper ends of the emergency valve holes, and the opening pressure of the emergency valve flaps is larger than that of the mechanical pilot valves; a plurality of air bags filled with air are arranged above the push ring, color powder is arranged in the air bags, and a plurality of poking needles capable of poking the air bags are arranged on the push ring.
6. The double control angle type safety valve according to claim 1, 3 or 4, wherein the left side and the right side of the valve body are respectively connected with a left joint and a right joint, the left joint and the right joint are of T-shaped structures, the outer ends of the left joint and the right joint are respectively sleeved with a connecting flange, the pressure inlet hole is formed in the right joint, and the pressure outlet hole is formed in the left joint.
7. The dual control angle relief valve according to claim 1, 3 or 4 wherein the valve cover is provided with a plurality of cooling fins.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710808615.0A CN107366766B (en) | 2017-09-09 | 2017-09-09 | Double-control angle type safety valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710808615.0A CN107366766B (en) | 2017-09-09 | 2017-09-09 | Double-control angle type safety valve |
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| CN107366766A CN107366766A (en) | 2017-11-21 |
| CN107366766B true CN107366766B (en) | 2023-05-09 |
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| CN201710808615.0A Active CN107366766B (en) | 2017-09-09 | 2017-09-09 | Double-control angle type safety valve |
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| CN108187899B (en) * | 2018-01-08 | 2019-11-26 | 温州美富达工艺品有限公司 | A kind of liquid spray formula double-screw washer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87215755U (en) * | 1987-11-24 | 1988-11-02 | 大连工学院 | Multifunction-closed type pre-operation safe valve |
| LU88390A1 (en) * | 1993-08-02 | 1995-03-01 | Hydrolux Sarl | Pilot stage for pressure relief valves |
| CN103851238A (en) * | 2014-02-18 | 2014-06-11 | 永一阀门集团有限公司 | Vacuum backflow prevention pilot operated safety valve |
| CN106499851B (en) * | 2015-08-20 | 2019-02-01 | 北京航天石化技术装备工程有限公司 | A kind of all-metal sealing pilot operated safety valve |
| CN105864496B (en) * | 2016-05-27 | 2018-01-30 | 永一阀门集团有限公司 | Backpressure regulation pilot operated safety valve |
| CN205956483U (en) * | 2016-08-30 | 2017-02-15 | 罗浮阀门集团有限公司 | Prevent high back pressure and vacuous guide's formula relief valve |
| CN207145703U (en) * | 2017-09-09 | 2018-03-27 | 罗浮阀门集团有限公司 | Double control angie type safety valve |
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