CN200968433Y

CN200968433Y - Inflated sealing gate valve

Info

Publication number: CN200968433Y
Application number: CN 200620075479
Authority: CN
Inventors: 花世杰
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-08-02
Filing date: 2006-08-02
Publication date: 2007-10-31
Anticipated expiration: 2016-08-02

Abstract

The utility model discloses a gate valve. The seal of the gate valve adopts the sealing way of the gas-filling expansion in a sealing ring. In the operational process of starting and closing the valve, a certain space between a valve seat and a water board is always kept, which does not produce the friction and avoids the abrasion between the valve seat and the water board so as to lengthen the life length of the valve and obtain the good sealing effect. The technological proposal of the utility model is that the gate valve comprises the valve seat 5 and the water board 7; the space is remained between the valve seat 5 and the water board 7; in the sealing position between the valve seat 5 and water board 7, the surface of the water board 7 has a ring groove; the ring groove is sealed by the silica gel sealing ring 8 which is fixed on the water board by the ring pressboard 9; the water board 7 has the ring free-expanding surface created of the sealing ring 8; the closed space is formed inside the groove, which is inflated by the exterior compressed gas source through a hose 12 connected with water board.

Description

The gas-flow closure gate valve

Technical field

The utility model relates to a kind of valve, especially relates to a kind of flashboard valve.

Background technique

At present, general its structure of flashboard valve is made up of valve body, valve seat, flashboard etc.Structural type has Single disc valve and refreshing flashboard valve.For wearing and tearing and the sealing problem that solves gate valve, the general method that adopts of existing gate valve is that valve seat and flashboard material adopt cemented carbide or pottery.Because valve seat and flashboard are in the delicate joint state all the time, in opening and closing the valve process, constantly produce friction between valve seat and flashboard, cause the wearing and tearing of valve seat and flashboard in the course of time, make flashboard lose sealing effect, cause the leakage of valve.In addition, in a lot of Environmental Conditions, the medium of carrying in the pipeline is a particulate matter, perhaps have tiny particulate matter in fluid foods, these particulate matters can rest between valve seat and the flashboard, at valve opening with when closing, cause the heavy wear of sealing surfaces between valve seat and the flashboard, or cause gate to close fully, cause the leakage of valve, the sealability of infringement valve.The wearing and tearing of existing gate valve and leakage problem have limited the working life and the using scope of gate valve.

Summary of the invention

Existing gate valve is easy to wear in order to overcome, the problem of easy leakage, the utility model provides a kind of novel gate valve, its sealing adopts seal ring inflation mode to seal, in the operating process of unlatching, throttle down, remain certain clearance between valve seat and the flashboard, and valve body and seal ring parts are without any sliding contact.Only under the state of valve closing, just can contact behind the seal ring inflation, greatly reduce the wearing and tearing of valve like this with valve body.

The technological scheme that the utility model adopted is:

A kind of gate valve, comprise valve seat 5 and flashboard 7,7 on valve seat 5 and flashboard leave the gap, and at the sealing station of valve seat 5 with flashboard 7, there is annular recess on flashboard 7 surfaces, groove is by silicone rubber O-ring 8 sealings, with annular pressing plate 9 seal ring 8 is fixed on the flashboard 7, seal ring 8 leaves the ring-type Free Surface on flashboard 7 surfaces, and forms confined space in groove, this space is by 13 hoses 12 of the pressurized gas interface on the flashboard, and flexible pipe 12 is attached to the pressurized gas interface 22 on the valve seat 5.

Be different from existing gate valve and produce sealing process by valve seat and flashboard delicate joint, the utility model is realized sealing by the Free Surface inflation of the seal ring that the flashboard surface is provided with.Free Surface is the part that silicone rubber O-ring is not subjected to flashboard and pressing plate compacting, outwards free expansion after the inflation.Owing to keep certain clearance between valve seat and flashboard, when open, during the operation of throttle down, valve seat and flashboard do not produce friction all the time, can not cause the wearing and tearing of valve.For guaranteeing that flashboard can not produce friction with valve seat in moving, seal ring Free Surface, annular pressing plate and flashboard surface are kept at grade.Gate valve of the present utility model is to come work in the following way, when carrying out the closing operation of valve, at first as existing gate valve, by artificial, pneumatic or electronic mode, flashboard is moved to the position of closing, because the existence in gap between valve seat and the flashboard, valve seat and flashboard do not have friction-produced in moving.For with valve closing, by external compression gas source of the gas by the pressurized gas interface on pressurized gas interface, flexible pipe and the flashboard on the valve seat to inflating in the confined space in the flashboard groove, the seal ring Free Surface produces and expands, the seal ring surface of expanding presses together with valve seat, the valve inner fluid is produced sealing process, valve closing.When carrying out the operation of Open valve, the pressurized gas in the seal ring to be emitted earlier by flexible pipe etc., circle to be sealed is with after valve seat separates, and mobile again flashboard is to open position, valve opening.

For after charging into pressurized gas, the tight pressing of the seal ring of expansion and valve seat, complete, leak free throttle down, pressure of compressed air is greater than the pressure of valve inner fluid at least.For this reason, can select to be provided with a pressure transducer 4, gas pressure intensity in the seal ring be monitored, according to this switching manipulation of control valve.

For improving the sealability of valve, can be respectively equipped with described inflatable seal circle on the two sides of flashboard.

For further improving the utility model, can on valve of the present utility model, add and

purge suction port

21,23 and 24, when valve applications when conveying has the fluid of solid particulate matter, when valve opening or closing operation, be used for flashboard is purged,, cause the closely pressing of seal ring and valve seat to guarantee can not leave fine particulate material between valve seat and flashboard, cause the leakage of valve, influence the sealability and the working life of valve.

According to the prepared gate valve of the utility model, can when the open and close of valve, remain certain clearance between valve seat and flashboard, make flashboard and valve seat can not produce friction, prevent the wearing and tearing of valve seat and flashboard, thereby prolonged the working life of valve; And by the sealing of gas-flow closure circle realization valve, sealing effect is better, particularly when conveying has the fluid of solid particulate matter, can reach complete leak free sealing effect, thereby application area is more extensive.

Description of drawings

Fig. 1 is the plan view according to inflation double seal gate valve of the present utility model;

Fig. 2 is the sectional view of Fig. 1 along A-A ' line;

Fig. 3 is that the inflation double seal gate valve is in the sectional drawing under the closed condition;

Fig. 4 is that the inflation double seal gate valve is in the sectional drawing under the open mode.

The utility model is described in further detail below in conjunction with the drawings and specific embodiments.Scope of the present utility model is not exceeded with embodiment, but is limited by the scope of claim.

Embodiment

As Fig. 1, embodiment realizes the utility model on the pneumatic flat plate gate valve, adopts the inflatable seal circle to carry out double-sealing on the two sides of flashboard, and has pressurized air purging function.

As Fig. 2, Fig. 3, plate valve comprises valve seat 5, flashboard 7.The motion of flashboard 7 is promoted by the joint 6 of cylinder piston 1 through piston and flashboard.The motion of cylinder piston 1 is controlled by the solenoid valve 2 that is positioned on the cylinder air inlet.Magnetic switch 3 is used for the position that flashboard 7 moves is monitored, and sends control signal.

7 on valve seat 5 and flashboard keep certain clearance, and on the surface at the sealing position of flashboard 7, both sides are respectively equipped with inflatable seal circle 8.Promptly at the sealing station of flashboard 7 with valve seat 5, there is annular recess on flashboard 7 surfaces, in groove, be provided with silicone rubber O-ring 8, be pressed into groove by annular pressing plate 9, the both sides of seal ring 8 are fixing by pressing plate 9 and flashboard 7, seal ring 8 forms confined space in groove, and leaves the ring-type Free Surface between pressing plate 9 and flashboard 7.The space on flashboard 7 both sides is linked by the aperture on the flashboard 7.This space is by pressurized gas interface 13 hoses 12 on the flashboard 7, and flexible pipe 12 connects with pressurized gas interface 22 on the valve seat 7.Be provided with pressure transducer 4, connect with serial fashion with pressurized gas interface 22.Pressurized gas interface 22 on the valve seat 5 can connect external compression air source of the gas.

Be respectively equipped with purging

suction port

21,23 and 24 in the upper and lower of valve seat 5, be connected with the space that flashboard in the valve seat moves.

The working principle of described inflation double seal gate valve is as follows:

When valve carries out closing operation by opening state, purging suction port 23 and 24 feeds pressurized air and earlier the bottom of valve seat 5 is purged, pressurized air is by the control of solenoid valve 2, promoting cylinder piston 1 moves down, with throttle down, when flashboard 7 moves to the position of cutting out, magnetic switch 3 sends control signal, cylinder piston 1 stops to move, external compression air source of the gas is by the pressurized gas interface 22 on the valve seat 5, pressurized gas interface 13 on flexible pipe 12 and the flashboard, to seal ring 8 inflations, seal ring 8 Free Surfaces produce swollen rising, and the swollen seal ring that rises 8 surfaces press together with valve seat 5, when gas pressure intensity reaches setting value in the seal ring 8, the pressure transducer 4 of series connection sends control signal, purges suction port 23,24 stop to purge, and the valve closing action is finished.Gate valve closed condition such as Fig. 3.

When valve is opened by closed position, pressurized gas is by the pressurized gas interface on the valve seat 5 22 venting in advance in the seal ring 8, purging suction port 21 feeding pressurized air purge the top of valve seat 5, circle 8 to be sealed is with after valve seat 5 separates, pressurized air is by the control of solenoid valve 2, promoting cylinder piston 1 moves up, to open valve, when flashboard 7 moves to the position of unlatching, magnetic switch 3 sends control signal, cylinder piston 1 stops to move, and purges suction port 21 simultaneously and stops to purge, and the valve open action is finished.Gate valve open mode such as Fig. 4.

Claims

1, a kind of gate valve, comprise valve seat (5) and flashboard (7), it is characterized in that: leave the gap between valve seat (5) and flashboard (7), at the sealing station of valve seat (5) with flashboard (7), there is annular recess on flashboard (7) surface, groove is sealed by silicone rubber O-ring (8), with annular pressing plate (9) seal ring (8) is fixed on the flashboard (7), seal ring (8) leaves the ring-type Free Surface on flashboard (7) surface, and in groove, form confined space, by mouthful (a 13) hose (12), flexible pipe (12) is attached to the pressurized gas interface (22) on the valve seat (5) by the pressurized gas on the flashboard (7) in this space.

2, gate valve according to claim 1 is characterized in that: seal ring (8) is pressed into groove by annular pressing plate (9), and the both sides of seal ring (8) are fixing by pressing plate (9) and flashboard (7).

3, gate valve according to claim 1 and 2 is characterized in that: seal ring (8) Free Surface, annular pressing plate (9) and flashboard (7) surface keep at grade.

4, gate valve according to claim 1 and 2 is characterized in that: valve is provided with pressure transducer (4), connects with serial fashion with pressurized gas interface (22) on the valve seat (5).

5, gate valve according to claim 1 and 2 is characterized in that: be provided with on valve seat (5) and purge suction port (21,23 and 24), be connected with the space that flashboard in the valve seat moves.

6, gate valve according to claim 1 and 2 is characterized in that: the two sides of flashboard (7) is respectively equipped with described seal ring (8).