CN2219401Y

CN2219401Y - Medium pressure-filling sealing butterfly valve

Info

Publication number: CN2219401Y
Application number: CN 95230750
Authority: CN
Inventors: 张重辉
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-08
Filing date: 1995-04-08
Publication date: 1996-02-07
Anticipated expiration: 2005-04-08

Abstract

The utility model relates to a medium pressure-filling sealing butterfly valve. The periphery of a butterfly plate is provided with a metal sealing ring. The inner circumference of a valve body is provided with a ring-shaped elastic sealing component with a pressure-filling inner cavity in a circumferential direction. The pressure-filling inner cavity is provided with a pipeline communicated with the outside and the outer portion of the valve body is provided with a two-bit and three-way reversing valve whose P opening is communicated with the pressure side of the valve. An O opening is communicated with the non-pressure side of the valve. An opening is communicated with the pipeline of the pressure-filling inner cavity used for communicating with the outside. When the valve is closed, medium pressure is filled into the inner cavity of the sealing component by the reversing valve to be tightly combined with the periphery of the butterfly plate to form a sealing auxiliary. When the valve is opened or closed, the inner cavity does not have pressure. Thus the starting moment is small and the abrasion on the sealing component is light.

Description

Medium pressurising seal butterfly valve

The utility model relates to the sealing of a kind of butterfly valve, particularly a kind of butterfly valve.

In the prior art, the butterfly valve seal circle made from rubber all is solid, and its sealing is that the interference power that produces by the size interference of rubber seal realizes.The shortcoming of this seal ring is: because interference power is big, thereby causes the valve opening and closing moment of torsion big, when valve opening and closing, also relatively more serious to the wearing and tearing of seal ring.

The purpose of this utility model is in order to overcome above-mentioned shortcoming, and it is little to propose a kind of switching moment of torsion, during switching to ring wear light, the positive pressure system butterfly valve.

The utility model is realized with the following method.

Medium pressurising seal butterfly valve has valve body, butterfly plate, the butterfly plate periphery has metal o-ring, but the garden cyclic spring Sealing (hereinafter to be referred as the pressurising Sealing) that the pressurising inner chamber is arranged at garden Zhou Fangxiang there is in the valve body garden week, the inner chamber of pressurising Sealing, a pipeline that is connected with the external world is arranged, outside the valve body of butterfly valve, a two-bit triplet selector valve is arranged, its P mouth is connected with the pressure-bearing side of valve, the O mouth is connected or emptying with the non-pressure-bearing side of valve, and the A mouth is connected with the extraneous pipeline that is connected with pressurising Sealing inner chamber.The metal o-ring of pressurising Sealing and the butterfly plate periphery sealing pair that partners.After the inner chamber of pressurising Sealing charged into the pressure that equates with the pressure of valve pressure-bearing side medium, its internal diameter was slightly smaller than the external diameter of butterfly plate seal ring, and sealing interference size is promptly arranged after the pressurising of pressurising Sealing.

Valve is when opening state, and the spool of selector valve is in the position that the A mouth is communicated with the O mouth, and the chamber pressure of pressurising Sealing is very low or do not have pressure.During throttle down, the rotation butterfly plate is to closed position, allows the spool of selector valve in the position that the A mouth is communicated with the P mouth, and then the inner chamber of pressurising Sealing is charged into the pressure that equates with valve pressure-bearing side, make pressurising seal ring lock ring on the seal ring of butterfly plate periphery, realize valve seal.During Open valve, allow the spool of selector valve get back to the position that the A mouth is communicated with the O mouth again, the pressure of pressurising Sealing inner chamber is got rid of, and rotates butterfly plate again, Open valve.

The utility model is when opening and close valve, and pressurising Sealing chamber pressure is very low or do not have pressure, so interference power is very little, thereby required torque is little when valve opening and closing, and is also very slight to the wearing and tearing of pressurising Sealing.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 is the plan view of medium pressurising seal butterfly valve,

Fig. 2 is the partial enlarged drawing at I place among Fig. 1,

Fig. 3 is when adopting another kind of seal ring, the partial enlarged drawing at I place among Fig. 1,

Fig. 4 is the connection diagram of medium pressurising Sealing, butterfly valve and selector valve.

Among Fig. 1, medium pressurising seal butterfly valve has valve body 1, butterfly plate 2, and the periphery of butterfly plate 2 has metal o-ring 21, garden week pressurising Sealing 3 is arranged in the valve body 1, pressurising Sealing 3 and metal o-ring 21 sealing pair that partners, and valve body 1 is outer two-bit triplet selector valve 4.

Among Fig. 1, Fig. 4, the P mouth of selector valve 4 communicates with the pressure-bearing side of valve with conduit 42, and the O mouth communicates or emptying the intracavity inter-connection of A mouth and pressurising Sealing 3 through conduit 43 with the non-pressure-bearing side of valve.

The pressurising Sealing can be a single-piece, also can be assembly parts.Among Fig. 2, pressurising Sealing 3 is assembly parties, it is by being made up of the garden cyclic spring seal ring 31 and the thin-walled garden ring pipe 32 of concave channels at garden Zhou Fangxiang, the inner chamber of garden ring pipe 32 has and the extraneous pipeline (not drawing among the figure) that communicates, the concave channels that can fill up elastic seal ring 31 after 32 pressurisings of garden ring pipe.Among Fig. 3, pressurising Sealing 3 is single-pieces, but is the garden cyclic spring seal ring that the pressurising inner chamber is arranged along garden Zhou Fangxiang, and the inner chamber of gas-flow closure circle 3 has and the extraneous pipeline (not drawing among the figure) that communicates.

Claims

1. a medium pressurising seal butterfly valve comprises valve body, butterfly plate, and the butterfly plate periphery has metal o-ring, it is characterized in that:

(1) valve body inner circumference, but the ring elastomer seal that the pressurising inner chamber is arranged at circumferencial direction is arranged, but its pressurising inner chamber is connected with a pipeline that communicates with the external world,

(2) valve body has a two position three way directional control valve outward, but the pressurising inner chamber of its A mouth and above-mentioned elastomer seal be connected with the extraneous pipeline that communicates, the P mouth communicates with the pressure-bearing side of butterfly valve, the O mouth communicates or emptying with the non-pressure-bearing side of valve.

2. by the described butterfly valve of claim 1, it is characterized in that: but describedly form ring Guan Youyi pipeline that communicates with the external world by the ring elastomer seal of pressurising inner chamber by the ring pipe that circumferencial direction outside can fill up concave channels after by the ring elastic seal ring of concave channels and pressurising at circumferencial direction.

3. by the described butterfly valve of claim 1, it is characterized in that: but but described at circumferencial direction the circle cyclic spring Sealing of pressurising inner chamber to be arranged be the ring elastic seal ring that the pressurising inner chamber is arranged at circumferencial direction.