CN113202969B - Pneumatic pipe burst safety valve and method - Google Patents

Pneumatic pipe burst safety valve and method Download PDF

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Publication number
CN113202969B
CN113202969B CN202110415599.5A CN202110415599A CN113202969B CN 113202969 B CN113202969 B CN 113202969B CN 202110415599 A CN202110415599 A CN 202110415599A CN 113202969 B CN113202969 B CN 113202969B
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China
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valve
end cover
pressure
seat
main channel
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CN113202969A (en
Inventor
李鹏
廖一衡
孔令臣
冯贵超
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China Three Gorges Corp
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China Three Gorges Corp
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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
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
    • F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
    • F16K31/363—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor the fluid acting on a piston
    • 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
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves

Abstract

A pneumatic tube burst safety valve and method includes a valve body, an end cover, a moving part, a valve shaft, a valve disc, a gas cylinder and a communicating loop. The invention overcomes the problems that the original pipe explosion valve adopts a spring as a driving valve disc, and the valve disc is easy to open and close and is inconvenient to adjust, and has the characteristics of simple structure, capability of avoiding closure or opening failure, contribution to flexibly adjusting pressure and simple and convenient operation.

Description

Pneumatic pipe burst safety valve and method
Technical Field
The invention belongs to the technical field of shutoff valves, and relates to a pneumatic pipe bursting safety valve and a method.
Background
The leakage of a large amount of fluid caused after the pipe explosion of the pressure pipeline occurs can cause great loss to the production and the life of people along the line. The pipe explosion safety valve controlled by the pipe explosion safety valve can quickly act to complete closing, the consequence caused by leakage of the fluid of the leakage section is reduced to the minimum influence, and the secondary loss caused by accidents is reduced, so that the safety and the economical efficiency of a pipe network are improved.
The invention has the following patents: 201310301183.6, a pipe explosion shutoff valve, including establishing the valve body with the inside intercommunication of body on the body, pipe explosion shutoff valve still includes control chamber, valve shaft and establishes in proper order first elastomeric element, piston, valve disc on the valve shaft, the control chamber meets with the valve body, the valve shaft passes in the control chamber gets into the valve body, the piston is established in the control chamber, the control chamber is connected with piston rigid, divide into independent upper chamber, lower chamber with the chamber system chamber, the valve disc is established in the valve body, lower chamber passes through lower chamber siphunculus and body intercommunication, can drive the valve shaft along its central line motion after first elastomeric element atress takes place to warp, valve shaft motion can make the piston take place to warp in the control chamber and change the size of upper chamber and lower chamber, can drive the valve disc at valve body and the inside motion of body simultaneously.
The disadvantages are that: because the spring is used as the force for driving the valve to close, the spring is not actuated for a long time, metal creep action can occur, the elastic coefficient is reduced, and the valve is closed when the pressure of a pipeline is low, so that failure is caused; when the valve closing set value is adjusted, the compression stroke of the spring needs to be changed or the spring needs to be directly replaced, so that the adjustment is inconvenient.
Disclosure of Invention
The invention aims to solve the technical problem of providing a pneumatic pipe burst safety valve and a method, the pneumatic pipe burst safety valve is simple in structure, a branch channel of a valve body is connected with a flange surface on one side of an end cover, the flange surface on the other side of the end cover is connected with an end cover, a valve shaft is in sliding fit with a core seat of the end cover, a valve disc positioned at one end of the valve shaft is in contact with a valve seat in the valve body, an upper cavity and a lower cavity on two sides of a moving part at the other end of the valve shaft are respectively communicated with an air bottle and a communication loop, the valve disc is driven to be closed or opened by the pressure difference between fluid on the upper cavity and the downstream side of a main channel, the failure of closure or opening is avoided, the pressure can be flexibly adjusted, and the operation is simple and convenient.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a pneumatic pipe burst safety valve comprises a valve body, an end cover, a movable piece, a valve shaft, a valve disc, a gas cylinder and a communication loop; the flange faces at two ends of the end cover are respectively connected with the valve body and the end cover, the valve disc is positioned in the valve body and is contacted with the valve seat, the valve shaft is in sliding fit with the end cover, one end of the valve shaft is connected with the valve disc, the moving part is connected with the other end of the valve shaft, the gas cylinder is communicated with the end cover, and the communication loop is communicated with the valve body and the end cover.
The valve body includes a branch passage communicating with the main passage, and the valve seat is located between the main passage and the branch passage.
The movable part is located the cavity between end cover and the end cover and cooperates with it, and the gas cylinder communicates with the epicoele of movable part upside, and the one end of intercommunication return circuit communicates with the cavity of movable part downside.
The shaft body of the valve shaft is sleeved with a sealing sleeve and a limiting seat, the shaft body is in sliding fit with a center hole of a core seat of the end cover, the sealing sleeve is in matched sealing with the core seat, and the limiting seat is connected with the core seat to lock the sealing sleeve.
And the sealing assembly arranged on the lower side surface of the valve disc is contacted with the end surface of the valve seat and the sealing ring.
The gas cylinder is fixedly connected with the end cover.
The communicating loop comprises a branch pipeline connected with the main pipeline and a ball valve positioned on the branch pipeline, one end of the main pipeline is communicated with the lower cavity, the other end of the main pipeline is communicated with the main channel at one end of the valve body, and one end of the branch pipeline is communicated with the main channel at the other end of the valve body.
The valve shaft is perpendicular to the main channel of the valve body or inclines to one side of the main channel; the movable part connected with the valve shaft is a piston or a diaphragm.
When the upper cavity pressure of the upper side of the moving part is greater than the lower cavity pressure of the lower side of the moving part, the valve disc is contacted with the valve seat, otherwise, the valve disc is far away from the valve seat and is not contacted with the valve seat.
The closure method of the pneumatic type burst pipe safety valve comprises the following steps:
s1, in a normal state, the ball valve is closed, the thrust of the fluid on the downstream side of the main channel acting on the valve disc is larger than the thrust of the air pressure of the air bottle acting on the movable piece, and the valve disc is not in contact with the valve seat and is in an open state; at this time, the fluid flows from the upstream side of the main passage to the downstream side of the main passage through the valve seat;
s2, in the intercepting state, when the pressure of the fluid on the downstream side of the main channel fluctuates and the thrust of the fluid on the downstream side acting on the valve disc is smaller than the thrust of the air pressure of the air cylinder acting on the movable piece, the air pressure in the upper cavity drives the movable piece to drive the valve shaft to move downwards, so that the valve disc and the valve seat are contacted to close the main channel; at this time, the valve disk blocks the flow of the fluid from the upstream side to the downstream side of the main passage;
s3, conducting and recovering, starting the ball valve, enabling the fluid on the upstream side of the main channel to enter the main channel along the branch pipeline and then enter the downstream side and the lower cavity of the main channel; when the common thrust of the fluid on the downstream side of the main channel acting on the valve disc and the fluid in the lower cavity acting on the movable piece is larger than the thrust of the air pressure of the air cylinder acting on the movable piece, the valve disc is opened, the normal state is recovered, and the ball valve is closed;
in S1-S3, the pressure of the upper chamber is determined by the pressure of the gas cylinder, and the pressure value of the upper chamber is set by adjusting the pressure of the gas cylinder.
A pneumatic pipe burst safety valve comprises a valve body, an end cover, a movable piece, a valve shaft, a valve disc, a gas cylinder and a communication loop; the flange surfaces at two ends of the end cover are respectively connected with the valve body and the end cover, the valve disc is positioned in the valve body and contacts with the valve seat, the valve shaft is in sliding fit with the end cover, one end of the valve shaft is connected with the valve disc, the moving part is connected with the other end of the valve shaft, the gas cylinder is communicated with the end cover, and the communication loop is communicated with the valve body and the end cover. The valve shaft is in sliding fit with the core holder of the end cover, the valve disc positioned at one end of the valve shaft is in contact with the valve seat in the valve body, the upper cavity and the lower cavity on two sides of the moving part at the other end of the valve shaft are respectively communicated with the gas cylinder and the communication loop, the valve disc is driven to be closed or opened through the pressure difference between the upper cavity and the fluid on the downstream side of the main channel, closure or opening failure is avoided, flexible pressure adjustment is facilitated, and the valve shaft is simple and convenient to operate.
In a preferred arrangement, the valve body includes a branch passage communicating with the main passage, and the valve seat is located between the main passage and the branch passage. The structure is simple, when the valve is used, in a normal state, the valve disc is in an open state, namely the valve disc is far away from the valve seat and is not contacted with the valve seat, fluid passes through the valve seat from the upstream side of the main channel to the downstream side of the main channel, and the fluid flows normally.
In a preferred scheme, the movable piece is positioned in a cavity between the end cover and matched with the cavity, the gas cylinder is communicated with an upper cavity on the upper side of the movable piece, and one end of the communication loop is communicated with a lower cavity on the lower side of the movable piece. The structure is simple, when the gas cylinder is in an opening state, air pressure enters the upper cavity, and the movable part bears the downward thrust of the air pressure; the lower cavity is communicated with the downstream side of the main channel through a communication loop, and fluid enters the lower cavity under the action of pressure to apply upward pressure of the movable piece.
Preferably, the gas cylinder is filled with inert gas under the pressure of argon or nitrogen, so that the stability is good.
Preferably, a pressure regulating valve is arranged on a pipeline for communicating the gas cylinder with the upper cavity, and the pressure value in the upper cavity is regulated by regulating the size of the pressure regulating valve.
Preferably, the end cover is a hollow cylinder, flanges are arranged at two ends of the cylinder, one end of the core print seat in the cylinder extends out of the flange at the lower side, and the other end of the core print seat is positioned in the lower cavity.
Preferably, the center of the core print is provided with a through hole which penetrates through the core print and is in sliding fit with the valve shaft, and a step is arranged in the through hole.
Preferably, the flange surface of the end cover is matched with the flange surface on the upper side of the end cover, and the movable piece is positioned in the upper cavity of the end cover.
In the preferred scheme, the shaft body of the valve shaft is sleeved with a sealing sleeve and a limiting seat, the shaft body is in sliding fit with a central hole of a core seat of the end cover, the sealing sleeve is in fit sealing with the core seat, and the limiting seat is connected with the core seat to lock the sealing sleeve. The valve shaft is in sliding fit with the sealing sleeve and the core holder, and the sealing sleeve prevents fluid in the branch channel from entering the lower cavity.
Preferably, the end that the end cover one end is stretched out to the core print contradicts with the reducing section on the valve shaft, restricts the ascending flexible volume of valve shaft, avoids the in-process that the valve shaft upwards moved to make moving part one end impact the end cover lid.
In a preferred embodiment, the sealing assembly arranged on the underside of the valve disk is in contact with the valve seat end face and the sealing ring. Simple structure, during the use, valve disc and seal assembly and the terminal surface of disk seat and sealing ring contact are sealed.
Preferably, the sealing assembly comprises a sealing ring with a T-shaped cross section, a pressing block and a fastener, the sealing ring is matched with the concave notch on the lower side face of the valve disc, the pressing block is pressed with the sealing ring, and the fastener penetrates through the pressing block to be connected and fixed with the valve disc.
In a preferred scheme, the gas cylinder is fixedly connected with the end cover. When the gas cylinder is installed, a hoop is arranged on the gas cylinder, and a fastener penetrates through the hoop to be fixedly connected with flange faces at two ends of the end cover.
In a preferred scheme, the communicating loop comprises a branch pipeline connected with the main pipeline and a ball valve positioned on the branch pipeline, one end of the main pipeline is communicated with the lower cavity, the other end of the main pipeline is communicated with the main channel at one end of the valve body, and one end of the branch pipeline is communicated with the main channel at the other end of the valve body. Simple structure, during the use, when the valve disc is in normal condition, the ball valve is in the closed condition, and the pressure in main passage and the lower chamber keeps steady state, makes the stable main passage that passes through of fluid.
Preferably, when the pipe explosion occurs at the downstream side of the main passage, the fluid in the downstream side is disturbed, and the fluctuation of the fluid pressure is gradually reduced; when the pressure in the upper cavity overcomes the friction force of the movable piece and the upward thrust of the valve disc is applied to the downstream side, the movable piece pushes the valve shaft to drive the valve disc to gradually approach the valve seat to contact with the valve seat, and the downstream side of the main channel is intercepted.
Preferably, after the pipe burst at the downstream side of the main channel is repaired, the ball valve is opened, the fluid continuously enters the downstream side of the main channel and then enters the lower cavity along the main pipeline, and when the fluid pressure at the downstream side of the main channel applies upward thrust to the valve disc and the upper cavity applies upward thrust to the movable member to jointly overcome the friction force of the movable member and the downward thrust to the valve disc applied by the upper cavity, the valve shaft drives the valve disc to move upward and away from the valve seat, so that the valve disc is in an open state; at this time, the fluid smoothly passes through the main passage, and then the ball valve is closed, and the valve disc is in a stable state under the action of the fluid pressure of the main passage.
In a preferred scheme, the valve shaft is perpendicular to the main channel of the valve body or the valve shaft inclines to one side of the main channel; the movable member connected to the valve shaft is a piston or a diaphragm. The structure is simple, and when the valve shaft is in a vertical state in use, the friction resistance between the shaft body and the core seat and between the shaft body and the sealing sleeve is small by means of the dead weight of the valve disc; when the valve axial direction main channel side inclines, the friction resistance between the shaft body and the core seat and between the shaft body and the sealing sleeve increases; the smaller the angle between the valve shaft and the axis of the main passage, the greater its frictional resistance.
Preferably, during manufacturing, different inclination angles of the valve shaft are set, and the valve shaft is matched with the pressure of the gas cylinder so as to adapt to different fluids and the flow or flow rate of the main channel and be capable of rapidly and accurately opening and closing the valve disc.
Preferably, when the movable piece adopts a piston, the flange surface at one side of the end cover is provided with a concave annular hole which is matched and sealed with the outer wall of the piston.
Preferably, when the moving part adopts a diaphragm, the diaphragm is of a flat-bottom socket-shaped structure, and concave socket holes are formed in flange surfaces of the end covers, which are in contact with the end cover covers; in the flow-stopping state, the diaphragm is matched with the socket hole on the end cover; during the opening process of the valve disc, the valve shaft drives the diaphragm to move upwards to be matched with the socket hole in the end cover.
Preferably, the diaphragm rim is secured to the flange face between the end cap and the end cap cover.
In a preferred scheme, when the upper cavity pressure on the upper side of the movable member is greater than the lower cavity pressure on the lower side of the movable member, the valve disc is contacted with the valve seat, otherwise, the valve disc is far away from the valve seat and is not contacted with the valve seat. When the ball valve is used, after the ball valve is opened, fluid on the upstream side of the main channel enters the downstream side of the main channel, and after the fluid on the downstream side is filled, the fluid enters the lower cavity along the main channel to form communication, and at the moment, the fluid pressure on the downstream side of the lower cavity is equal to that on the downstream side of the main channel; when the pressure of the upper cavity is higher than the pressure of the lower cavity and the resistance of the valve shaft and the movable part is overcome, the valve shaft is driven to move downwards to enable the valve disc to be in contact with the valve seat and be closed.
In a preferred embodiment, the method for stopping the flow of the pneumatic burst safety valve comprises the following steps:
s1, in a normal state, the ball valve is closed, the thrust of the fluid on the downstream side of the main channel acting on the valve disc is larger than the thrust of the air pressure of the air bottle acting on the movable piece, and the valve disc is not in contact with the valve seat and is in an open state; at this time, the fluid flows from the upstream side of the main passage to the downstream side of the main passage through the valve seat;
s2, in the intercepting state, when the pressure of the fluid on the downstream side of the main channel fluctuates and the thrust of the fluid on the downstream side acting on the valve disc is smaller than the thrust of the air pressure of the air cylinder acting on the movable piece, the air pressure in the upper cavity drives the movable piece to drive the valve shaft to move downwards, so that the valve disc and the valve seat are contacted to close the main channel; at this time, the valve disk blocks the flow of the fluid from the upstream side to the downstream side of the main passage;
s3, conducting and recovering, starting the ball valve, and enabling the fluid at the upstream side of the main channel to enter the main channel along the branch pipeline and then enter the downstream side and the lower cavity of the main channel; when the common thrust of the fluid on the downstream side of the main channel acting on the valve disc and the fluid in the lower cavity acting on the movable piece is larger than the thrust of the air pressure of the air cylinder acting on the movable piece, the valve disc is opened, the normal state is recovered, and the ball valve is closed;
in S1-S3, the pressure of the upper chamber is determined by the pressure of the gas cylinder, and the pressure value of the upper chamber is set by adjusting the pressure of the gas cylinder. The method is simple and convenient to operate, the valve disc is controlled to be opened or closed through fluid pressure and air pressure, electric control is not needed, the valve disc action is realized through self pressure and compressed air by taking the pressure or flow rate characteristics of the downstream side and the upstream side of the main channel as judgment conditions, and the method is suitable for occasions with large pipe explosion influence, need of quick closing and high automation degree.
A pneumatic pipe burst safety valve and a method thereof comprise a valve body, an end cover, a moving part, a valve shaft, a valve disc, an air cylinder and a communication loop, wherein a branch channel of the valve body is connected with a flange face on one side of the end cover, a flange face on the other side of the end cover is connected with the end cover, the valve shaft is in sliding fit with a core seat of the end cover, the valve disc on one end of the valve shaft is in contact with a valve seat in the valve body, an upper cavity and a lower cavity on two sides of the moving part on the other end of the valve shaft are respectively communicated with the air cylinder and the communication loop, and the valve disc is driven to be closed or opened through pressure difference between fluids on the upper cavity and the downstream side of a main channel. The invention overcomes the problems that the original pipe explosion valve adopts a spring as a driving valve disc, and the valve disc is easy to lose efficacy and is inconvenient to adjust, and has the characteristics of simple structure, avoidance of closure or opening failure, contribution to flexibly adjusting pressure, and simple and convenient operation.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is another schematic structure of the present invention.
Fig. 3 is another schematic structural diagram of the present invention.
Fig. 4 is an enlarged schematic view of a portion a of fig. 1.
In the figure: the valve comprises a valve body 1, a main channel 11, a branch channel 12, a valve seat 13, a sealing ring 14, an end cover 2, a lower cavity 21, a core seat 22, an end cover 3, an upper cavity 31, a movable part 4, a valve shaft 5, a sealing sleeve 51, a limiting seat 52, a valve disc 6, a sealing assembly 61, a gas cylinder 7, a communication loop 8, a main pipeline 81, a branch pipeline 82 and a ball valve 83.
Detailed Description
As shown in fig. 1 to 4, a pneumatic pipe bursting safety valve comprises a valve body 1, an end cover 2, an end cover cap 3, a movable piece 4, a valve shaft 5, a valve disc 6, a gas cylinder 7 and a communication loop 8; the flange faces at two ends of the end cover 2 are respectively connected with the valve body 1 and the end cover 3, the valve disc 6 is located in the valve body 1 and contacts with the valve seat 13, the valve shaft 5 is in sliding fit with the end cover 2, one end of the valve shaft 5 is connected with the valve disc 6, the moving part 4 is connected with the other end of the valve shaft 5, the gas cylinder 7 is communicated with the end cover 3, and the communication loop 8 is communicated with the valve body 1 and the end cover 2. Simple structure, the flange face of branch passageway 12 through valve body 1 and end cover 2 one side is connected, the flange face of end cover 2 opposite side is connected with end cover 3, valve shaft 5 and the core print 22 sliding fit of end cover 2, the disk 6 that is located valve shaft 5 one end contacts with disk seat 13 in the valve body 1, epicoele 31 and the cavity of resorption 21 of the moving part 4 both sides of the valve shaft 5 other end communicate with gas cylinder 7 and intercommunication return circuit 8 respectively, drive disk 6 to close or open through the pressure difference between epicoele 31 and the 11 downstream side fluid of main passage, avoid damming or open the inefficacy, be favorable to nimble regulated pressure, and easy operation is convenient.
In a preferred embodiment, the valve body 1 includes a branch passage 12 communicating with the main passage 11, and the valve seat 13 is located between the main passage 11 and the branch passage 12. The structure is simple, when in use, in a normal state, the valve disc 6 is in an open state, namely, the valve disc 6 is far away from the valve seat 13 and is not contacted with the valve seat 13, fluid passes through the valve seat 13 from the upstream side of the main passage 11 to the downstream side of the main passage 11, and the fluid normally flows.
In a preferable scheme, the movable element 4 is positioned in a cavity between the end cover 2 and the end cover 3 and is matched with the cavity, the gas cylinder 7 is communicated with an upper cavity 31 on the upper side of the movable element 4, and one end of the communication loop 8 is communicated with a lower cavity 21 on the lower side of the movable element 4. The structure is simple, when the gas cylinder 7 is in an opening state, the air pressure enters the upper cavity 31, and the movable piece 4 bears the downward thrust of the air pressure; the lower chamber 21 communicates with the downstream side of the main passage 11 through the communication circuit 8, and the fluid enters the lower chamber 21 under pressure to exert an upward pressure on the movable element 4.
Preferably, the gas cylinder 7 is filled with inert gas under the pressure of argon or nitrogen, so that the stability is good.
Preferably, a pressure regulating valve is arranged on a pipeline of the gas cylinder 7 communicated with the upper cavity 31, and the pressure value in the upper cavity 31 is regulated by regulating the size of the pressure regulating valve.
Preferably, the end cap 2 is a hollow cylinder, flanges are provided at two ends of the cylinder, one end of the core print 22 located in the cylinder extends out of the flange at the lower side, and the other end of the core print 22 is located in the lower cavity 21.
Preferably, a through hole is arranged at the center of the core seat 22 and is in sliding fit with the valve shaft 5, and a step is arranged in the through hole.
Preferably, the flange surface of the end cover 3 is matched with the flange surface on the upper side of the end cover 2, and the movable element 4 is positioned in the upper cavity 31 of the end cover 3.
In a preferred scheme, a sealing sleeve 51 and a limiting seat 52 are sleeved on a shaft body of the valve shaft 5, the shaft body is in sliding fit with a central hole of a core seat 22 of an end cover 2, the sealing sleeve 51 is in fit sealing with the core seat 22, and the limiting seat 52 is connected with the core seat 22 and locked with the sealing sleeve 51. The structure is simple, when in use, the sealing sleeve 51 is positioned in the through hole of the core print 22, two ends of the sealing sleeve 51 are respectively abutted against the step and the limiting print 52 in the through hole, the valve shaft 5 is in sliding fit with the sealing sleeve 51 and the core print 22, and the sealing sleeve 51 prevents the fluid in the branch channel 12 from entering the lower cavity 21.
Preferably, the end of the core holder 22 extending out of the end cap 2 abuts against the tapered section of the valve shaft 5, so as to limit the upward expansion and contraction amount of the valve shaft 5 and prevent one end of the movable member 4 from impacting the end cap cover 3 in the upward movement process of the valve shaft 5.
In a preferred scheme, a sealing assembly 61 arranged on the lower side of the valve disc 6 is contacted with the end surface of the valve seat 13 and the sealing ring 14. The structure is simple, and when the valve disc 6 and the sealing assembly 61 are used, the valve disc 6 and the sealing assembly are in contact sealing with the end surface of the valve seat 13 and the sealing ring 14.
Preferably, the sealing assembly 61 includes a sealing ring with a T-shaped cross section, a pressing block and a fastening member, the sealing ring is fitted with a concave notch on the lower side of the valve disc 6, the pressing block is pressed with the sealing ring, and the fastening member passes through the pressing block and is connected and fixed with the valve disc 6.
In a preferable scheme, the gas cylinder 7 is fixedly connected with the end cover 2. When the gas cylinder is installed, a hoop is arranged on the gas cylinder 7, and a fastening piece penetrates through the hoop to be fixedly connected with flange faces at two ends of the end cover 2.
In a preferred embodiment, the communication circuit 8 includes a branch pipe 82 connected to the main pipe 81, and a ball valve 83 located on the branch pipe 82, one end of the main pipe 81 is communicated with the lower chamber 21, the other end is communicated with the main channel 11 at one end of the valve body 1, and one end of the branch pipe 82 is communicated with the main channel 11 at the other end of the valve body 1. The structure is simple, and when the valve disc 6 is in a normal state in use, the ball valve 83 is in a closed state, and the pressure in the main passage 11 and the lower cavity 21 is kept in a stable state, so that the fluid is stably passed through the main passage 11.
Preferably, when a pipe burst occurs on the downstream side of the main passage 11, the fluid in the downstream side is disturbed, and the fluctuation of the fluid pressure is gradually reduced; when the pressure in the upper chamber 31 overcomes the friction of the movable member 4 and the downstream side applies an upward thrust to the valve disc 6, the movable member 4 pushes the valve shaft 5 to drive the valve disc 6 to gradually approach the valve seat 13 to contact with the valve seat, so as to shut off the downstream side of the main passage 11.
Preferably, after the pipe burst at the downstream side of the main passage 11 is repaired, the ball valve 83 is opened, the fluid continuously enters the downstream side of the main passage 11 and then enters the lower cavity 21 along the main pipeline 81, and when the fluid pressure at the downstream side of the main passage 11 applies the upward thrust of the valve disc 6 and the lower cavity 21 applies the upward thrust of the movable element 4, the friction force of the movable element 4 and the downward thrust of the valve disc 6 applied by the upper cavity 31 are overcome together, the valve shaft 5 drives the valve disc 6 to move upward and away from the valve seat 13, so that the valve disc 6 is in an open state; at this time, the fluid smoothly passes through the main passage 11, and the ball valve 83 is closed, and the valve disk 6 is in a stable state by the fluid pressure of the main passage 11.
In a preferred scheme, the valve shaft 5 is perpendicular to the main channel 11 of the valve body 1 or the valve shaft 5 inclines towards the main channel 11; the movable member 4 connected to the valve shaft 5 is a piston or a diaphragm. The structure is simple, when in use, when the valve shaft 5 is in a vertical state, the friction resistance between the shaft body and the core seat 22 and between the shaft body and the sealing sleeve 51 is small by the dead weight of the valve disc 6; when the valve shaft 5 is tilted toward the main passage 11 side, the frictional resistance between the shaft body thereof and the cartridge 22 and the seal bush 51 increases; the smaller the angle between the valve shaft 5 and the axis of the main channel 11, the greater its frictional resistance.
Preferably, during manufacturing, different inclination angles of the valve shaft 5 are set, and the valve shaft is matched with the pressure of the gas cylinder 7, so that the valve disc 6 can be rapidly and accurately opened and closed under different flows and flow rates of the main channel 11.
Preferably, when the movable piece 4 is a piston, a concave annular hole is arranged on the flange surface on one side of the end cover 2 to be matched and sealed with the outer wall of the piston.
Preferably, when the moving part 4 adopts a diaphragm, the diaphragm is of a flat-bottom socket-shaped structure, and concave socket holes are formed in flange surfaces of the end cover 2, which are in contact with the end cover 3; in the intercepting state, the diaphragm is matched with the socket hole on the end cover 2; during opening of the valve disc 6, the valve shaft 5 drives the diaphragm to move upwards to engage with the socket in the end cap housing 3.
Preferably, the membrane rim is fixed to the flange face between the end cap 2 and the end cap cover 3.
In a preferred embodiment, when the pressure of the upper chamber 31 on the upper side of the movable element 4 is greater than the pressure of the lower chamber 21 on the lower side of the movable element 4, the valve disc 6 contacts the valve seat 13, otherwise, the valve disc 6 is far away from the valve seat 13 and does not contact with the valve seat. The structure is simple, when the ball valve 83 is opened, the fluid on the upstream side of the main channel 11 enters the downstream side of the main channel 11, and after the fluid on the downstream side is filled, the fluid enters the lower cavity 21 along the main channel 11 to form communication, and at the moment, the fluid pressure on the downstream sides of the lower cavity 21 and the main channel 11 is equal; the upper chamber 31 is pressurized to a pressure greater than the lower chamber 21 and the valve shaft 5 and the movable member 4 are overcome, and the valve shaft 5 is driven to move downward to close the valve disc 6 and the valve seat 13.
In a preferred embodiment, the method for stopping the flow of the pneumatic burst safety valve comprises the following steps:
s1, in a normal state, the ball valve 83 is closed, the thrust of the fluid on the downstream side of the main channel 11 acting on the valve disc 6 is larger than the thrust of the air pressure of the air bottle 7 acting on the movable piece 4, and the valve disc 6 is not in contact with the valve seat 13 and is in an open state; at this time, the fluid flows from the upstream side of the main passage 11 to the downstream side of the main passage 11 through the valve seat 13;
s2, in the intercepting state, when the pressure of the fluid on the downstream side of the main channel 11 fluctuates and the thrust of the fluid on the downstream side acting on the valve disc 6 is smaller than the thrust of the air pressure of the air bottle 7 acting on the movable member 4, the air pressure in the upper chamber 31 drives the movable member 4 to drive the valve shaft 5 to move downwards, so that the valve disc 6 contacts with the valve seat 13 to close the main channel 11; at this time, the valve disk 6 blocks the flow of the fluid from the upstream side to the downstream side of the main passage 11;
s3, the conduction is recovered, the ball valve 83 is opened, and the fluid on the upstream side of the main channel 11 enters the main channel 81 along the branch pipeline 82 and then enters the downstream side of the main channel 11 and the lower cavity 21; when the common thrust of the fluid on the downstream side of the main channel 11 acting on the valve disc 6 and the fluid in the lower cavity 21 acting on the movable element 4 is greater than the thrust of the air pressure of the air bottle 7 acting on the movable element 4, the valve disc 6 is opened, the normal state is recovered, and the ball valve 83 is closed;
in S1 to S3, the pressure of upper chamber 31 is determined by the pressure of gas cylinder 7, and the pressure of gas cylinder 7 is adjusted to set the pressure value of upper chamber 31. The method is simple and convenient to operate, the valve disc 6 is controlled to be opened or closed through fluid pressure and air pressure, electric control is not needed, the valve disc 6 is actuated by self pressure and compressed air by taking pressure or flow rate characteristics of the downstream side and the upstream side of the main channel 11 as judgment conditions, and the method is suitable for occasions with large pipe explosion influence, rapid closing requirement and high automation degree.
Preferably, the pressure of the compressed gas in the gas cylinder 7 is adjusted, and the pressure set value when the pneumatic pipe bursting safety valve is closed is adjusted, wherein the relationship among the parameters is as follows:
and (3) during normal operation: p is 1 ·A＞P 0 ·A＋f
When the valve is closed: p 2 ·A＜P 0 ·A-f
Wherein: valve body downstream side pressure P when pneumatic pipe explosion safety valve is fully opened 1 Downstream side pressure-P of valve body when pneumatic pipe-bursting safety valve is fully closed 2 Effective area of piston-A, pressure of compressed gas in cylinder-P 0 The friction force between the valve shaft and the lower end cover is f.
When the pneumatic tube explosion safety valve and the method are installed and used, the branch channel 12 of the valve body 1 is connected with the flange face on one side of the end cover 2, the flange face on the other side of the end cover 2 is connected with the end cover 3, the valve shaft 5 is in sliding fit with the core seat 22 of the end cover 2, the valve disc 6 located at one end of the valve shaft 5 is in contact with the valve seat 13 in the valve body 1, the upper cavity 31 and the lower cavity 21 on two sides of the moving part 4 at the other end of the valve shaft 5 are respectively communicated with the gas cylinder 7 and the communication loop 8, and the pressure difference between the upper cavity 31 and the fluid on the downstream side of the main channel 11 drives the valve disc 6 to be closed or opened, so that closure or opening failure is avoided, flexible pressure adjustment is facilitated, and the operation is simple and convenient.
In use, in a normal state, the valve disc 6 is in an open state, i.e. the valve disc 6 is away from the valve seat 13 and not in contact therewith, and fluid flows normally from the upstream side of the main passage 11 through the valve seat 13 to the downstream side of the main passage 11.
When the gas cylinder 7 is in an open state, air pressure enters the upper cavity 31, and the movable piece 4 bears the downward thrust of the air pressure; the lower chamber 21 communicates with the downstream side of the main passage 11 through the communication circuit 8, and the fluid enters the lower chamber 21 under pressure to exert an upward pressure on the movable element 4.
When the valve is used, the sealing sleeve 51 is located in the through hole of the core print 22, two ends of the sealing sleeve 51 respectively abut against the step and the limiting print 52 in the through hole, the valve shaft 5 is in sliding fit with the sealing sleeve 51 and the core print 22, and the sealing sleeve 51 prevents the fluid in the branch channel 12 from entering the lower cavity 21.
When in use, the valve disc 6 and the sealing assembly 61 are in contact with and sealed with the end surface of the valve seat 13 and the sealing ring 14.
When the gas cylinder is installed, a hoop is arranged on the gas cylinder 7, and a fastening piece penetrates through the hoop to be fixedly connected with flange faces at two ends of the end cover 2.
In use, when the valve disc 6 is in the normal condition, the ball valve 83 is in the closed condition and the pressure in the main passage 11 and the lower chamber 21 remains in a steady state, stabilizing the flow through the main passage 11.
When the valve shaft 5 is in a vertical state, the friction resistance between the shaft body and the core seat 22 and between the shaft body and the sealing sleeve 51 is small by the self weight of the valve disc 6; when the valve shaft 5 is tilted toward the main passage 11 side, the frictional resistance between the shaft body thereof and the cartridge 22 and the seal bush 51 increases; the smaller the angle between the valve shaft 5 and the axis of the main channel 11, the greater its frictional resistance.
In use, when the ball valve 83 is opened, the fluid on the upstream side of the main passage 11 enters the downstream side of the main passage 11, and after the fluid on the downstream side is filled, the fluid enters the lower cavity 21 along the main passage 11 to form communication, and at this time, the fluid pressure on the downstream sides of the lower cavity 21 and the main passage 11 is equal; the upper chamber 31 is pressurized to a pressure greater than the lower chamber 21 and the valve shaft 5 and the movable member 4 are overcome, and the valve shaft 5 is driven to move downward to close the valve disc 6 and the valve seat 13.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of this invention.

Claims (4)

1. The utility model provides a pneumatic type booster relief valve which characterized by: the valve comprises a valve body (1), an end cover (2), an end cover (3), a movable piece (4), a valve shaft (5), a valve disc (6), a gas cylinder (7) and a communication loop (8); the flange faces at two ends of the end cover (2) are respectively connected with the valve body (1) and the end cover (3), the valve disc (6) is positioned in the valve body (1) and is contacted with the valve seat (13), the valve shaft (5) is in sliding fit with the end cover (2), one end of the valve shaft (5) is connected with the valve disc (6), the movable part (4) is connected with the other end of the valve shaft (5), the gas cylinder (7) is communicated with the end cover (3), and the communication loop (8) is communicated with the valve body (1) and the end cover (2);
the moving piece (4) is positioned in a cavity between the end cover (2) and the end cover (3) and is matched with the cavity, the gas cylinder (7) is communicated with an upper cavity (31) on the upper side of the moving piece (4), and one end of the communication loop (8) is communicated with a lower cavity (21) on the lower side of the moving piece (4);
a sealing sleeve (51) and a limiting seat (52) are sleeved on a shaft body of the valve shaft (5), the shaft body is in sliding fit with a central hole of a core seat (22) of the end cover (2), the sealing sleeve (51) is in fit sealing with the core seat (22), and the limiting seat (52) is connected with the core seat (22) and locked with the sealing sleeve (51);
the communication loop (8) comprises a branch pipeline (82) connected with the main pipeline (81) and a ball valve (83) positioned on the branch pipeline (82), one end of the main pipeline (81) is communicated with the lower cavity (21), the other end of the main pipeline is communicated with the main channel (11) at one end of the valve body (1), and one end of the branch pipeline (82) is communicated with the main channel (11) at the other end of the valve body (1);
the valve shaft (5) is perpendicular to the main channel (11) of the valve body (1) or the valve shaft (5) inclines to one side of the main channel (11); the moving part (4) connected with the valve shaft (5) is a piston or a diaphragm;
when the pressure of an upper cavity (31) on the upper side of the moving part (4) is greater than the pressure of a lower cavity (21) on the lower side of the moving part (4), the valve disc (6) is contacted with the valve seat (13), otherwise, the valve disc (6) is far away from the valve seat (13) and is not contacted with the valve seat;
the intercepting method comprises the following steps:
s1, in a normal state, the ball valve (83) is closed, the thrust of the fluid on the downstream side of the main channel (11) acting on the valve disc (6) is larger than the thrust of the air pressure of the air bottle (7) acting on the movable piece (4), and the valve disc (6) is not in contact with the valve seat (13) and is in an open state; at this time, the fluid flows from the upstream side of the main passage (11) to the downstream side of the main passage (11) through the valve seat (13);
s2, in a cut-off state, when the fluid pressure on the downstream side of the main channel (11) fluctuates and the thrust of the fluid on the downstream side acting on the valve disc (6) is smaller than the thrust of the air pressure of the air bottle (7) acting on the movable piece (4), the air pressure in the upper cavity (31) drives the movable piece (4) to drive the valve shaft (5) to move downwards, so that the valve disc (6) and the valve seat (13) are contacted to close the main channel (11); at this time, the valve disk (6) blocks the fluid from flowing from the upstream side to the downstream side of the main passage (11);
s3, conducting and recovering, opening the ball valve (83), enabling the fluid on the upstream side of the main channel (11) to enter the main pipeline (81) along the branch pipeline (82) and then enter the downstream side of the main channel (11) and the lower cavity (21); when the common thrust of the fluid on the downstream side of the main channel (11) acting on the valve disc (6) and the fluid in the lower cavity (21) acting on the movable piece (4) is greater than the thrust of the air pressure of the air bottle (7) acting on the movable piece (4), the valve disc (6) is opened, the normal state is recovered, and the ball valve (83) is closed;
in S1-S3, the pressure of the upper chamber (31) is determined by the pressure of the gas cylinder (7), and the pressure value of the upper chamber (31) is set by adjusting the pressure of the gas cylinder (7).
2. The pneumatic booster safety valve of claim 1, wherein: the valve body (1) comprises a branch channel (12) communicated with the main channel (11), and the valve seat (13) is positioned between the main channel (11) and the branch channel (12).
3. The pneumatic booster safety valve of claim 1, wherein: and a sealing component (61) arranged on the lower side surface of the valve disc (6) is contacted with the end surface of the valve seat (13) and the sealing ring (14).
4. The pneumatic booster safety valve of claim 1, wherein: the gas cylinder (7) is fixedly connected with the end cover (2).
CN202110415599.5A 2021-04-16 2021-04-16 Pneumatic pipe burst safety valve and method Active CN113202969B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2435728C2 (en) * 1974-07-25 1984-05-24 AEG-Kanis Turbinenfabrik GmbH, 8500 Nürnberg Pressure-medium operated extraction quick-closing valve for steam and gas turbines
CN101963251B (en) * 2010-09-30 2012-07-11 北京航天动力研究所 Pilot-operated safety valve with modulation characteristic
CN202417966U (en) * 2012-01-09 2012-09-05 广东永泉阀门科技有限公司 Pneumatic energy-saving piston balancing water pump control valve
CN103353001B (en) * 2013-07-18 2016-08-10 中国长江三峡集团公司 Booster shutoff valve
CN203686279U (en) * 2014-02-03 2014-07-02 梁龙飞 Solar evacuated tube crack safety valve
CN214662048U (en) * 2021-04-16 2021-11-09 中国长江三峡集团有限公司 Pneumatic type tube burst safety valve

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