CN204716997U - The explosion-proof Emergeny Cutoff Valves of guide's direct acting Normally closed type - Google Patents

Abstract

The utility model relates to a pilot direct-acting normally closed explosion-proof emergency cut-off valve, which comprises a main valve and a pilot valve. The main valve is composed of a valve body, a valve disc and a valve cover; The piston structure fits between the round walls, a pressure relief hole is made in the center of the valve disc, and a balance hole is formed on the outer periphery of the valve disc sealing surface, which connects the right cavity and the middle cavity of the valve body, and the valve is installed between the back of the valve disc and the lower end surface of the valve cover. Spring; the pilot valve includes a pilot valve disc, a pilot valve rod, a manual opening device, a valve opening locking device, an electromagnetic control device and a bracket. Under normal working conditions, the valve opening locking device and the electromagnetic control device jointly lock the opening between the pilot valve disc and the pressure relief hole of the valve disc, and the valve disc opens; in an emergency, the electromagnetic control device loses power, the valve opening locking device unlocks, and the pilot The valve disc is closed with the pressure relief hole of the valve disc, and the valve disc is closed to cut off the flow of medium. It realizes power failure and cuts off the pipeline medium, and its emergency cut-off reliability is good. It is suitable for the emergency cut-off valve of the inlet and outlet pipelines of chemical gas-liquid warehouses such as oil storage tanks.

Description

Pilot direct acting normally closed explosion-proof emergency shut-off valve

technical field

The utility model belongs to the field of valves, in particular to a cut-off valve. The utility model is suitable for an emergency cut-off valve of the inlet and outlet pipelines of chemical gas-liquid warehouses such as oil storage tanks.

Background technique

At present, the oil inlet and outlet pipelines in the oil storage tank area are generally installed with swing check valves and electric or manual shut-off valves for the connection and cut-off of the medium. In and out of pipes. However, at the scene of a fire or explosion, the operator cannot approach the valve to cut off the operation, and the electric valve also loses its control function due to the damage of the wire, which leads to the failure to cut off the transmission of the accident pipeline medium in time, resulting in the occurrence or further expansion and spread of fire and other emergency accidents. lead to major accidents and economic losses.

Contents of the invention

The purpose of the utility model is to provide a pilot direct-acting normally closed explosion-proof emergency shut-off valve that can shut off when power is off and can reliably cut off pipelines in an emergency.

The technical scheme of the utility model includes a main valve and a pilot valve. The main valve is composed of a valve body, a valve disc and a valve cover. The valve body has a left cavity, a right cavity and a middle cavity, and a valve seat is arranged between the right cavity and the middle cavity. The lower end surface of the valve disc is made with a sealing surface that cooperates with the valve seat; mainly, the piston structure is matched between the outer circular surface of the valve disc and the inner wall of the middle cavity of the valve body, and a pressure relief hole is formed in the center of the valve disc. There is a balance hole connecting the right cavity and the middle cavity of the valve body on the outer periphery, and the closing valve spring is installed between the back of the disc and the lower end of the valve cover; the pilot valve includes a pilot disc, a pilot stem, a manual opening device, a valve opening locking device, Electromagnetic control device and bracket, the bracket is fixedly installed on the sealing cover, and the sealing cover is sealed and installed on the valve cover; there is a tapered sealing matching surface between the pilot valve disc and the pressure relief hole of the valve disc, and the center of the upper end surface of the pilot valve disc is in contact with the guide valve stem. The lower end is fixedly connected, and a return spring is installed between the upper end surface of the pilot valve disc and the lower end surface of the sealing cover, and the dynamic and sealing cooperation between the outer circular surface of the upper part of the pilot valve stem and the round hole of the sealing cover; the manual opening device includes a valve opening installed on the bracket rod, the handle fixed on the upper end of the valve opening rod, the limit tube, the limit sleeve, the limit ball, the limit stopper, the limit tube is concentric with the pilot valve rod, and the outer circle of the lower end is fixed and installed in the round hole of the sealing cover. The limit ball is installed in the radial circular hole on the side wall of the upper end of the limit tube, the limit stopper is fixedly connected to the upper end of the pilot valve stem, and the lower end of the valve opening stem extends through the limit stopper into the axial direction of the pilot valve stem. In the inner hole, a limit nut is fixedly installed at the lower end of the valve opening stem; the upper end surface of the limit sleeve is fixedly connected to the lower end surface of the moving iron core, and the inner diameter of the lower part of the limit sleeve is smaller than that of the upper part. The outer circular surface of the position tube is dynamically fitted; the electromagnetic control device includes an electromagnetic coil and a moving iron core. The center hole of the electromagnetic coil passes through the valve stem and is fixed on the mounting bracket. The outer cylindrical surface of the vertical part of the moving iron core is dynamically matched with the center hole of the electromagnetic coil, and a return spring is installed between the upper end surface of the moving iron core and the bracket.

Preferably, an isolation pipe and a diversion cone are installed at the outlet of the pressure relief hole on the lower end surface of the valve disc.

Preferably, a shroud is installed on the wall of the inner cavity between the left cavity and the middle cavity of the valve body.

Preferably, a waterproof junction box is installed on the bracket.

The utility model has the advantage that the valve opening locking device and the electromagnetic control device are used to jointly control the position of the guide valve disc. In the open state, the pressure in the middle cavity of the valve body is released, and the valve disc is in the open state; in case of emergency, the electromagnetic coil of the electromagnetic control device is powered off, the valve opening locking device is unlocked, the pilot valve disc and the pressure relief hole of the valve disc are closed, and the valve The pressure in the body cavity rises, the valve disc closes, and the flow of the medium is cut off. Cut off the pipeline medium in case of power failure, and the reliability of emergency cut-off is good.

Description of drawings

Fig. 1 is the structural representation of the utility model.

1 valve body, 2 disc, 3 valve cover, 4 left cavity, 5 right cavity, 6 middle cavity, 7 valve seat, 8 pressure relief hole, 9 balance hole, 10 closing valve spring, 11 sealing cover, 12 guide valve disc , 13 guide valve rod, 14 bracket, 15 return spring, 16 valve opening rod, 17 handle, 18 limit tube, 19 limit sleeve, 20 limit ball, 21 limit block, 22 limit nut, 23 moving iron core, 24 electromagnetic coils, 25 return springs, 26 isolation tubes, 27 diversion cones, 28 diversion covers, 29 waterproof junction boxes, and 30 dustproof covers.

Detailed ways

As shown in Figure 1, the pilot direct-acting normally closed explosion-proof emergency shut-off valve includes a main valve and a pilot valve. The main valve is composed of a valve body 1, a valve disc 2, and a valve cover 3. Cavity 5 and middle cavity 6, a valve seat 7 is set between the right cavity 5 and the middle cavity 6, and the lower end surface of the valve disc 2 is formed with a sealing surface that cooperates with the valve seat 7; The piston structure fits between the inner circular walls of the cavity 6, that is, the inner circular wall of the valve body 1 middle cavity 6 is a smooth piston cylinder, and the dynamic sealing fit between the outer circular surface of the valve disc 2 and the inner circular wall of the valve body 1 middle cavity 6, A pressure relief hole 8 is formed in the center of the valve disc 2 to control the pressure of the medium in the middle chamber 6. A balance hole 9 is formed on the outer periphery of the sealing surface of the valve disc 2, which communicates with the right chamber 5 of the valve body 1 and the middle chamber 6, so that the medium in the left chamber 4 flows through the balance hole. 9 enters the middle cavity 6 to balance the medium pressure on the upper and lower ends of the valve disc 2, and the closing valve spring 10 is installed between the back of the valve disc 2 and the lower end of the valve cover 3; the pilot valve includes a pilot valve disc 12, a pilot valve rod 13, and a manual opening Device, valve opening locking device, electromagnetic control device and bracket 14, bracket 14 is fixedly installed on the sealing cover 11, and the sealing cover 11 is sealed and installed on the valve cover 3; there is a cone between the guide valve disc 12 and the pressure relief hole 8 of the valve disc 2 The opening and closing state between the guide valve disc 12 and the pressure relief hole 8 controls the medium pressure of the middle cavity 6, thereby controlling the opening and closing state between the valve disc 2 and the valve seat 7. When the guide valve disc 12 is tightly matched with the pressure relief hole 8, the medium pressure of the middle chamber 6 and the left chamber 4 are the same, and the valve disc 2 is closed under the pressure of the valve closing spring 10; When the center is in the open state, the medium pressure in the middle chamber 6 is released from the pressure relief hole 8, and the valve disc 2 is opened under the push of the medium pressure in the left chamber 4. The center of the upper end face of the guide valve disc 12 is fixedly connected with the lower end of the guide valve rod 13, and a return spring 15 is installed between the upper end face of the guide valve disc 12 and the lower end face of the sealing cover 11, and the outer circular surface of the upper part of the guide valve rod 13 and the round hole of the sealing cover 11 The dynamic sealing fit between them; the manual opening device includes the valve opening rod 16 installed on the bracket 14, the handle 17 fixed on the upper end of the valve rod 16, the limit tube 18, the limit sleeve 19, the limit ball 20, the limit stop Block 21, the limit tube 18 is concentric with the guide valve rod 13, the outer circle of its lower end is fixedly installed in the round hole of the sealing cover 11, the upper end of the guide valve rod 13 is in the center hole of the limit tube 18, and the limit ball 20 is installed in the limit In the radial round hole of the side wall of the upper end of the pipe 18, the limit stopper 21 is fixedly connected to the upper end of the pilot valve rod 13, and the outer circular surface of the limit stopper 21 is matched with the circular wall clearance in the center hole of the limiter pipe 18 to open. The lower end of the valve rod 16 passes through the limit block 21 and stretches into the axial inner hole of the pilot valve rod 13. The limit nut 22 is fixedly installed, and the limit nut 22 is located in the axial inner hole of the guide valve rod 13 below the limit block 21; the upper end surface of the limit sleeve 19 is fixedly connected to the lower end surface of the moving iron core 23, and The inner diameter of the lower part of the sleeve 19 is smaller than the inner diameter of the upper part, and the inner circular surface of the lower part of the limiting sleeve 19 is in motion with the outer circular surface of the limiting tube 18. When fitting, the limit ball 20 is squeezed by the limit sleeve 19, and its spherical surface protrudes into the center hole of the limit tube 18. The bit ball 20 can enter the radial space between the limit tube 18 and the limit sleeve 19; the electromagnetic control device includes an electromagnetic coil 24 and a moving iron core 23, and the center hole of the electromagnetic coil 24 passes through the opening rod 16 and is fixed on the mounting bracket 14 , the central hole of the vertical part of the moving iron core 23 is in dynamic fit with the outer surface of the valve opening rod 16, the outer cylindrical surface of the vertical part of the moving iron core 23 is in motion with the center hole of the electromagnetic coil 24, between the upper end surface of the moving iron core 23 and the bracket 14 The return spring 25 is installed, and when the electromagnetic coil 24 is energized, the moving iron core 23 moves upwards, and when the electromagnetic coil 24 is de-energized, the moving iron core 23 moves downward under the action of the return spring 25 .

An isolation pipe 26 and a diversion cone 27 are installed at the outlet of the pressure relief hole 8 on the lower end surface of the valve disc 2 to reduce the interference of the medium on the pressure relief flow of the pressure relief hole 8 when the valve disc 2 is opened.

A guide cover 28 is installed on the wall of the inner cavity between the left cavity 4 and the middle cavity 6 of the valve body 1 . A waterproof junction box 29 is installed on the support 14 . A dust cover 30 is installed on the upper end of the bracket 14 .

In the above embodiments, the handle 17 on the upper end of the valve opening rod 16 adopts an electric device or a pneumatic or hydraulic device to achieve the same effect as the handle 17 for pulling up the valve opening rod 16 . Electromagnetic control device also can adopt pneumatic or hydraulic device, realizes moving up and down to limit sleeve 19, and these structures belong to customary replacement means, all belong to the protection scope of the present utility model.

Working process: When you need to enter the working state, first unscrew the dust cover 30 and lift the handle 17, open the limit nut 22 at the bottom of the valve stem 16 to block the limit stopper 21, pull up the guide valve stem 13 and the guide valve disc 12 to lift up , so that the guide valve disc 12 is separated from the pressure relief hole 8, and at the same time the electromagnetic control device is powered on, the electromagnetic coil 24 generates magnetic force and overcomes the resistance of the return spring 25 to attract the moving iron core 23, and the moving iron core 23 drives the limit sleeve 19 moves up, and makes the limit ball 20 move toward the axis to protrude from the inner diameter of the limit tube 18. At this time, after the handle 17 is released, the limit block 21 at the end of the pilot valve rod 13 is stuck on the limit ball 20, and the pilot valve The flap 12 is position locked. The medium pressure in the middle chamber 6 begins to discharge to the right chamber 5 along the relief hole 8, the pressure in the middle chamber 6 decreases, and the medium pressure in the left chamber 4 pushes up the valve clack 2 and compresses the closing valve spring 10 to the fully open position, and the left The chamber 4 and the right chamber 5 start to transmit the medium with the maximum flow rate, and the valve enters the normal working state. When there is an emergency and the valve needs to be closed, after the working power is cut off, the electromagnetic coil 24 loses power, the return spring 25 releases the moving iron core 23 downwards, drives the limit sleeve 19 to move down, and gives way to the limit ball, and the 20 moves outward. Space, the limit ball 20 is unlocked after the extrusion of the limit block 21 moves outward, and the guide valve disc 12 moves downward along the guide valve rod 13 under the action of the return spring 15, and the pressure relief hole on the valve disc 2 8 sealing fit, from the left chamber 4 to the middle chamber 6 through the balance hole 9 on the disc 2, after the pressure balance between the middle chamber 6 and the left chamber 4 is achieved, the closing spring 10, the return spring 15 and the medium pressure of the middle chamber 6 Under the comprehensive action, the valve disc 2 is pushed to the valve seat 7 to realize sealing, the valve disc 2 closes the passage between the left chamber 4 and the right chamber 5, and the medium is cut off and the valve is in a closed state.

Claims (5)

1. A pilot direct-acting normally closed explosion-proof emergency shut-off valve, including a main valve and a pilot valve. The main valve is composed of a valve body (1), a valve disc (2), and a valve cover (3). The valve body (1) is made of There is a left cavity (4), a right cavity (5) and a middle cavity (6), a valve seat (7) is set between the right cavity (5) and the middle cavity (6), and the lower end surface of the valve disc (2) is shaped with a The sealing surface of the valve seat (7) cooperates with each other; it is characterized in that the outer circular surface of the valve disc (2) and the inner circular wall of the middle cavity (6) of the valve body (1) are matched by a piston structure, and the center of the valve disc (2) is made There is a pressure relief hole (8), and the outer periphery of the sealing surface of the valve disc (2) is equipped with a balance hole (9) connecting the right cavity (5) and the middle cavity (6) of the valve body (1). The valve closing spring (10) is installed between the lower ends of the cover (3); the pilot valve includes a pilot valve disc (12), a pilot valve rod (13), a manual opening device, a valve opening locking device, an electromagnetic control device and a bracket (14) , the bracket (14) is fixedly installed on the sealing cover (11), and the sealing cover (11) is sealed and installed on the valve cover (3); there is a Conical sealing mating surface, the center of the upper end surface of the pilot valve disc (12) is fixedly connected with the lower end of the pilot valve rod (13), and a return spring (15) is installed between the upper end surface of the pilot valve disc (12) and the lower end surface of the sealing cover (11). ), the upper outer circular surface of the guide valve rod (13) and the round hole of the sealing cover (11) are dynamically sealed; the manual opening device includes the valve opening rod (16) installed on the bracket (14), fixed on the valve opening rod (16) The handle (17), limit tube (18), limit sleeve (19), limit ball (20), limit block (21) on the upper end, limit tube (18) and guide valve rod ( 13) Concentric, the outer circle of its lower end is fixedly installed in the circular hole of the sealing cover (11), the limit ball (20) is installed in the radial circular hole of the upper end side wall of the limit tube (18), and the limit stopper (21 ) is fixedly connected to the upper end of the pilot valve rod (13), and the lower end of the valve opening rod (16) passes through the limit stopper (21) and extends into the axial inner hole of the pilot valve rod (13). 16) The limit nut (22) is fixedly installed at the lower end; the upper end surface of the limit sleeve (19) is fixedly connected to the lower end surface of the moving iron core (23), and the inner diameter of the lower part of the limit sleeve (19) is smaller than that of the upper part. (19) Bottom inner circular surface and limit pipe (18) outer circular surface move fit; Electromagnetic control device comprises electromagnetic coil (24) and moving iron core (23), and electromagnetic coil (24) central hole passes through opening valve stem ( 16) On the fixed mounting bracket (14), the center hole of the vertical part of the moving iron core (23) is dynamically matched with the outer circular surface of the valve opening rod (16), and the outer cylindrical surface of the vertical part of the moving iron core (23) is in contact with the electromagnetic coil (24) The central hole is movable, and a return spring (25) is installed between the upper end surface of the moving iron core (23) and the support (14). 2. The pilot direct-acting normally closed explosion-proof emergency shut-off valve according to claim 1, characterized in that an isolation pipe (26) and a diversion cone ( 27). 3. The pilot direct-acting normally closed explosion-proof emergency shut-off valve according to claim 1 or 2, characterized in that it is on the wall of the inner cavity between the left cavity (4) and the middle cavity (6) of the valve body (1) Install the shroud (28). 4. The pilot direct-acting normally closed explosion-proof emergency shut-off valve according to claim 1 or 2, characterized in that a waterproof junction box (29) is installed on the bracket (14). 5. The pilot direct-acting normally closed explosion-proof emergency shut-off valve according to claim 3, characterized in that a waterproof junction box (29) is installed on the bracket (14).