CN2353971Y

CN2353971Y - Plane hard-sealing butterfly valve

Info

Publication number: CN2353971Y
Application number: CN 98225559
Authority: CN
Inventors: 李鸿福
Original assignee: ZHEJIANG PORO VALVE MANUFACTURING Co Ltd
Current assignee: ZHEJIANG PORO VALVE MANUFACTURING Co Ltd
Priority date: 1998-11-02
Filing date: 1998-11-02
Publication date: 1999-12-15
Anticipated expiration: 2008-11-02

Abstract

The utility model discloses a plane hard-sealing butterfly valve, which is composed of a valve body, a valve seat, a valve rod, a valve plate, a connecting seat and springs. The utility model is characterized in that two springs are pressed and installed on two sides of the connecting seat to make the valve plate upwards lifted and then rotated under the action of the moment of the two springs when a valve is just opened, and in addition, a rolling wheel is arranged at the first contact point of the valve plate and the valve seat to make the valve realize no friction close in the process of operation to keep the high sealing performance of a sealing plane and prolong the service life of products when the valve is closed.

Description

The plane hard seal butterfly valve

The utility model relates to a kind of plane hard seal butterfly valve.The utility model is applicable to that air separation equipment makes industries such as gas automatic switchover and chemical industry, oil, metallurgy and block or regulate flow as medium.

Flat seal butterfly valve generally comprises valve body, valve seat, valve plate, valve rod, valve rod is connected with valve plate by connecting base, between valve plate and connecting base, press a spring, because acting force of the spring and valve eccentric structure cause unbalance moment to valve plate, make valve that one section friction zone be arranged in opening-closing process, reduce sealability, shortened the working life of product.

The purpose of this utility model is the problem that exists at prior art, design a kind of in opening-closing process, do not have between valve plate and the valve seat rub good seal performance, the plane hard seal butterfly valve of long service life.

For achieving the above object, the technical solution of the utility model comprises valve body, valve seat, valve plate, valve rod, connecting base and spring, and connecting base and valve plate are hinged, fixedlys connected with valve rod.Be fixed with the transmission levers that extends to both sides on the connecting base, the upside at transmission levers two end part respectively is equipped with spring, and spring is set in two column outsides that are erected on the valve plate.In addition, a roller is equipped with at the first point of contact place of valve plate and valve seat when valve closing.

The utility model is provided with spring respectively above the connecting base both sides, in opening-closing process, by of the variation of two spring forces with respect to support moment, make valve plate when opening, produce upwards lifting force, under the transmission levers effect, begin revolution behind the disengaging valve seat, when closing, the roller at valve plate elder generation point of contact place has been offset frictional force, open and close thereby make valve plate in operating process, realize not having friction, guaranteed the sealability of plane butterfly valve, prolonged working life.

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

Now carefully chat embodiment of the present utility model in conjunction with the accompanying drawings.

Plane hard seal butterfly valve as shown in Figure 1 comprises valve body 9, valve seat 6, valve plate 7, valve rod 8, connecting base 10.

Valve seat 6 is made for metallic material, is inlaid in the valve body 9, and the ring packing step surface that cooperatively interacts is arranged between the valve body 9, and a planar annular sealing surface that cooperatively interacts is also arranged between the valve plate 7.

Valve plate 7 is made for metallic material, and a roller 1 is equipped with at when valve plate 7 is closed and the first point of contact place of valve seat 6.There is lug 5 partial center position, valve plate 7 back side, on the valve plate 7 of lug 5 both sides, be provided with two root posts, 11,12, two

columns

11,12 and equate from the distance of valve plate 7 central points, and with valve plate 7 central planes of valve rod 8 axis normal on.

Connecting base 10 is fixedlyed connected with valve rod 8, and is hinged by mandrel 3 with the lug on the valve plate 7, the wishbone lever 4 that extend the oriented both sides of articulating point, and wishbone lever 4 directly extends to the outside of two columns 11,12.Lever 4 downsides of crossing valve plate 7 center lines one side at articulating point have a projection, and projection summit and valve plate 7 are gapped apart from e during state of equilibrium.

Respectively be set with

spring

2,16 on two

columns

11,12 above the lever 4, between the lower end of

spring

2,16 and the lever 4 spring seat 13 arranged, spring cup 14 is being pressed in the upper end, and is fitted on the column by nut 15.

Claims

1, a kind of plane hard seal butterfly valve, comprise valve body, valve seat, valve plate, valve rod, connecting base and spring, connecting base is fixedlyed connected with valve rod, hinged with valve plate, the transmission levers that extend oriented both sides on the connecting base, the two ends that it is characterized in that described transmission levers (4) upside are pressed with spring (2,16) respectively, and spring (2,16) is set on two root posts of erectting in the valve plate (7) (11,12), with valve seat (6) foremost contacting position place a roller (1) is housed at valve plate (7).

2, plane according to claim 1 hard seal butterfly valve is characterized in that between described connecting base (10) and the valve body (9) by mandrel (3) pin joint.