CN2418307Y

CN2418307Y - 3-D eccentric-cone hard-sealing telescopic butterfly valve

Info

Publication number: CN2418307Y
Application number: CN 00229686
Authority: CN
Inventors: 王根尚
Original assignee: ZHENGZHOU VALVE GROUP CO Ltd
Current assignee: ZHENGZHOU VALVE GROUP CO Ltd
Priority date: 2000-04-12
Filing date: 2000-04-12
Publication date: 2001-02-07
Anticipated expiration: 2010-04-12

Abstract

The utility model relates to a 3-D eccentric conical surface hard sealing telescopic butterfly valve, which comprises a valve body, a valve seat, a valve shaft, a valve plate, and sealing packing. The utility model is characterized in that the sealing surface of the valve seat and the sealing surface of valve plate are both deflective conical table surfaces; the conical points B of the deflective conical table surfaces are biased at one side of the centerline of a flow channel of the valve body; the shaft core of the valve shaft and the centerline of the valve body have an eccentric distance; the shaft core of the valve shaft and center lines of the sealing surfaces also have a distance; the left end of the valve body is connected with an expansion pipe. The utility model has the advantages of reasonable structure, sealing pairs formed by the deflective conical table surfaces, tight fits of the sealing surfaces, no leakage, high temperature resistance, high pressure resistance, three-eccentric structure, small turning moment, long service life, convenient maintenance, and convenient replacement.

Description

The flexible butterfly valve of the hard sealing of the three-dimensional eccentric conical surface

The utility model relates to a kind of valve, the flexible butterfly valve of the hard sealing of the eccentric conical surface of especially a kind of three-dimensional, and it is applicable on the conveyance conduit of all kinds of media of high, medium and low voltage.

At present, purposes valve approximate, that structure is different is of a great variety, it is multiple only to be that metal hard-sealing butterfly valve also has, but existing metal hard-sealing butterfly valve is because due to its structure, in use have the following disadvantages: (1), seal valve seat structural type adopt " U ", " S " and " L " type, there is leakage phenomenon in various degree in the sealing of these several forms, and only is applicable on the low pressure pipeline, the easier leakage of high pressure medium.And leaking rear valve base is difficult for changing.(2), butterfly valve adopts two eccentric structures, the butterfly valve moment of torsion is big, opens relatively difficulty, damages component easily.(3), the butterfly plate sealing surface adopts body to process, anti-dielectric corrosion performance is poor, causes leakage phenomenon easily.(4), be bumped into other alloy material on the butterfly plate that has, increase the sectional area of butterfly plate, influenced the flow of medium.(5), no joint chair is connected between butterfly valve and the transmission device, the valve shaft place just can repair or replace filler after leaking and must laying down transmission device, influences the normal operation of pipeline.(6), butterfly valve when use to occur leaking or change butterfly valve, pipeline must be severed could lay down butterfly valve, cause the maintain and replace time long, efficient is low, waste material and manually.(7), valve shaft connects with generally adopting taper pin being connected of valve plate, reduces the intensity of valve shaft, causes the distortion and the fracture of valve shaft easily.

A kind of novel hard seal butterfly valve that the purpose of this utility model is designed and developed at the existing deficiency of above-mentioned existing valve just, this valve mechanism is reasonable, good sealing effect, moment of rotation is little, high temperature high voltage resistant, long service life, convenient maintenance and replacement.

The purpose of this utility model realizes by following scheme:

The flexible butterfly valve of the hard sealing of the eccentric conical surface of three-dimensional of the present utility model comprises valve body, is fixed on valve seat in the valve body by fastening disk, be installed on the valve shaft and valve plate and stuffing box packing that match with valve seat, wherein: the sealing surface of valve seat and the sealing surface of valve plate are inclined to one side frustum face, and both cooperate the formation sealing pair; Partially the conical point B of frustum face is offset to valve flowing channel center line one side, and valve shaft revolution axle center O and valve flowing channel center line have a throw of eccentric E, also have a distance L with the sealing surface center line, is connected with telescopic pipe at the left end of valve body.

In the utility model, the thickness of valve plate edge sealing part is less than the thickness of valve plate center, and its effect is to reduce seal f ace width, improves sealability; Built-up welding has stainless steel material on the sealing surface of valve plate, can prevent the corrosion of sealing surface; Valve shaft top is provided with joint chair, is used for being connected with transmission device; In order to guarantee the intensity of valve shaft, valve plate combines by flat key and valve shaft; Telescopic pipe is by compression plate and compress filler and be sleeved on the valve body left end.

1., owing to adopt three eccentric structures the advantage that the utility model is compared with prior art possessed is:, moment of torsion is little, opens easily; 2., adopt inclined to one side frustum face to constitute sealing pair, sealing surface cooperates tight, does not have to leak, and high temperature resistant, high pressure; 3., valve body and valve seat adopts the solid forging structure, the processing back is indeformable, exchanges easily; 4., sealing surface of valve plate adopts the built-up welding stainless steel material, can prevent the corrosion of sealing surface, reduces the sectional area of valve plate, increased the flow of butterfly valve medium.5., valve seat is connected by joint chair with transmission device, filler is adjusted and changed to axial leakage easily; 6., valve shaft and valve plate adopt flat key to be connected, than the taper pin connection of common employing, more can guarantee the intensity of valve shaft; 7., in order to solve the problem that the butterfly valve maintain and replace is wasted time and energy, this butterfly valve has also increased telescopic pipe, when changing when needing repairing, with the telescopic pipe retraction, butterfly valve can be unloaded, and has improved working efficiency.

The drawing of accompanying drawing is described as follows:

Fig. 1 is a structural front view of the present utility model.

Fig. 2 is the A-A sectional view of Fig. 1.

The utility model is done below in conjunction with accompanying drawing and is described in further detail:

As shown in Figure 1 and Figure 2: the flexible butterfly valve of the hard sealing of this three-dimensional eccentric conical surface comprises valve body (4), is fixed on the interior valve seat (5) of valve body (4) by fastening disk (6), be installed on the valve shaft (9) and valve plate (8) that match with valve seat (5), wherein: the sealing surface of the sealing surface of valve seat (5) and valve plate (8) is inclined to one side frustum face, and both cooperate the formation sealing pair; The thickness of valve plate (8) edge sealing part is less than the thickness of valve plate center, and its effect is to reduce seal f ace width, improves sealability; Built-up welding has stainless steel material on the sealing surface of valve plate, can prevent the corrosion of sealing surface; The conical point B of frustum face is offset to valve body (4) runner center line one side partially, and valve shaft (8) revolution axle center O and valve body (4) runner center line have a throw of eccentric E, also have a distance L with the sealing surface center line.Telescopic pipe (1) is sleeved on valve body (4) left end by compression plate (2) and stuffing box packing (3).Valve shaft (9) top is provided with joint chair (10), is used for being connected with transmission device; In order to guarantee the intensity of valve shaft, valve plate (8) combines by flat key (7) and valve shaft (9).

During work, rotate valve shaft and open valve gradually, and slowly strengthen with the rotation valve port of valve rod, when becoming 90 ° with pipe diameter up to the valve plate plane valve port open maximum, counter-rotation when closing, valve port dwindles gradually, until closing up sealing.

Claims

1, the flexible butterfly valve of the hard sealing of the eccentric conical surface of a kind of three-dimensional, it comprises valve body (4), be fixed on the interior valve seat (5) of valve body by fastening disk (6), be installed on the valve shaft (9) and valve plate (8) that match with valve seat (5), it is characterized in that: the sealing surface of the sealing surface of valve seat (5) and valve plate (8) is inclined to one side frustum face, both cooperate the formation sealing pair: the conical point B of frustum face is offset to valve flowing channel center line one side partially, valve shaft revolution axle center O and valve flowing channel center line have a throw of eccentric E, also there is a distance L with the sealing surface center line, is connected with telescopic pipe (1) at the left end of valve body (4).

2, the flexible butterfly valve of the hard sealing of the eccentric conical surface of three-dimensional according to claim 1, it is characterized in that: the thickness of valve plate (8) edge sealing part is less than the thickness of valve plate center.

3, the flexible butterfly valve of the hard sealing of the eccentric conical surface of three-dimensional according to claim 1 and 2, it is characterized in that: built-up welding has stainless steel material on valve plate (8) sealing surface.

4, the flexible butterfly valve of the hard sealing of the eccentric conical surface of three-dimensional according to claim 1, it is characterized in that: valve shaft (9) top is provided with joint chair (10), is used for being connected with transmission device.

5, the flexible butterfly valve of the hard sealing of the eccentric conical surface of three-dimensional according to claim 1, it is characterized in that: valve plate (8) combines by flat key (7) and valve shaft (9).

6, the flexible butterfly valve of the hard sealing of the eccentric conical surface of three-dimensional according to claim 1 is characterized in that: telescopic pipe (1) is by compression plate (2) and compress filler (3) and be sleeved on valve body (4) left end.