CN2080596U - Butterfly valve by metal rigid seal with inflating o-ring - Google Patents

Abstract

Disclosed is a butterfly valve by a metal rigid seal with an inflating O-shaped ring, belonging to the category of a butterfly valve by a metal rigid seal. The utility model which mainly solves the industrial application problems that a butterfly valve is used in a medium pressure field and in a high temperature field is characterize in that a seal pair is composed of a spherical butterfly plate and the metal O-shaped ring whose pipe is filled with pressure. The butterfly valve is composed of a valve body (1), the butterfly plate (2), a worm gear box (3), locating nuts (4), etc. The utility model is controlled by a handle under DN150 and is controlled by the hand wheel of the worm gear box over DN200, and power control can proceed after an electric actuating mechanism is reloaded. The utility model which has the advantages of compact structure, high reliability, long service life, nominal pressure <= 4.0 MPa, and maximum service temperature <= 425 DEG C is suitable for a petrochemical system, a thermal power system, a metallurgy system, a coal gas and heating power system, etc. to cut off or adjust fluid media.

Description

Butterfly valve by metal rigid seal with inflating O-ring

The utility model relates to a kind of valve, particularly with the metal hard-sealing wafer type butterfly valve of pressurized O shape ring.

It is a kind of in petrochemical industry that the utility model provides, and thermoelectricity can be used in the systems such as metallurgical and coal gas heating power to cut off or the metal hard-sealing wafer type butterfly valve of the band pressurized O shape ring of regulated fluid medium.

Present metal hard-sealing wafer type butterfly valve of the prior art generally all is made up of several parts such as valve body, butterfly plate, valve shaft, seal ring and operating mechanisms.Bear pressure and all be no more than 2.5MPa, serviceability temperature is no more than 350 ℃, when filler is changed, needs to remove earlier operating mechanism, and is very inconvenient, and seal ring itself do not have pressurising, and the elasticity deficiency influences using effect.

The metal hard-sealing wafer type butterfly valve of the band pressurized O shape ring that the utility model provides, Sealing is the inner metal-O-ring that is filled with pressure, the numerical value of pressurising can change with the size of butterfly valve working pressure.Butterfly plate is the part of standard ball, and off-centre is disposed in the butterfly valve cavity, and the inboard formation of spherome surface and metal-O-ring sealing pair is realized the sealing of butterfly valve.Fill out letter and adopt external mounted, need not remove control system mechanism is replaceable filler.

Compared with prior art, the utlity model has three characteristics: (1) butterfly valve nominal pressure can be brought up to 4MPa, and serviceability temperature can be brought up to 425 ℃; (2) the inside and outside pressurized of metal-O-ring balance roughly, good springiness, the life-span is long; (3) the filler adjustment is changed easy.

Concrete enforcement of the present utility model such as Fig. 1, Fig. 2 and shown in Figure 3.Metal hard-sealing wafer type butterfly valve is made up of valve body (1), butterfly plate (2), Worm gear case (3), stop screw (4), Gland nut (5), Gland (6), valve shaft (7), metal-O-ring (8) pad (9) and end clamp plate major components such as (10).Clockwise rotate the handwheel on the Worm gear case (3), rotate with the handwheel coaxial worm thereupon, worm screw rotatablely moves for 90 ° thereby drive butterfly plate (2) work by the action of the worm gear drives valve shaft on the valve shaft (7), makes butterfly valve by reaching the pass.Otherwise, rotating counterclockwise handwheel, butterfly plate (2) reversing motion makes butterfly valve by closing out.Two stop screws (4) on the Worm gear case (3) are then controlled the angular displacement of worm gear respectively, make the correct switch of butterfly valve.As changing into Worm gear case (3) electronic or pneumatic actuator can realize that then electricity, gas handle.Metal-O-ring (8) is welded by the bending of OCr19Ni9 Stainless Steel Tube, charges into inert gas before the weldering, and inflation pressure and butterfly valve working pressure are about equally.With the argon arc welding welding, fixing with end clamp plate (10) on the inner chamber shoulder of the metal-O-ring after the pressurising through being placed on valve body (1) behind the precision grinding, pad (9) plays corrective action after the pressurising.The sealing surface of butterfly plate (2) is a spherome surface, butterfly plate (2) radially off-centre is placed on the lower end of valve shaft (7), and fix with pin with valve shaft, be offset to Way out along passage axis with valve shaft again, when valve shaft (7) drives the butterfly plate rotation, rely on the eccentric tension force that produces metal-O-ring, make progressively to reach even contact between butterfly plate sphere and the metal-O-ring working surface until sealing fully.When butterfly valve interpolation or renewal filler, back out Gland nut (5), the Gland that moves up (6) can carry out, and need not dismantle Worm gear case mechanism.

Accompanying drawing 1 metal hard-sealing wafer type butterfly valve plan view

Accompanying drawing 2 metal hard-sealing wafer type butterfly valve side views

Accompanying drawing 3 metal hard-sealing wafer type butterfly valve seal structural representations

Code name meaning among the figure:

1 valve body

2 butterfly plates

3 Worm gear cases

4 stop screws

5 Gland nuts

6 Glands

7 valve shafts

8 metal-O-rings

9 pads

10 end clamp plates

Claims (3)

1, a kind of metal hard-sealing wafer type butterfly valve with pressurising 0 shape ring, form by valve body (1), butterfly plate (2), Worm gear case (3), valve shaft (7) and metal 0 shape ring several parts such as (8), the sealing surface that it is characterized in that butterfly plate (2) is the part of spheroid, and it forms metal-seated with the metal 0 shape ring (8) that is inlaid in the valve body (1).

2, butterfly valve according to claim 1 is characterized in that butterfly plate (2) links to each other with valve shaft (7) with eccentric configuration structure, and the valve body of packing into (1) is to form the tension force to metal-O-ring.

3, butterfly valve according to claim 1 is characterized in that metal-O-ring (8) is filled with interior pressure.

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