CN2261539Y

CN2261539Y - Bidirectional sealed high temperature butterfly gate

Info

Publication number: CN2261539Y
Application number: CN 96213189
Authority: CN
Inventors: 朱继祖; 汤小雷
Original assignee: Individual
Current assignee: Individual
Priority date: 1996-07-02
Filing date: 1996-07-02
Publication date: 1997-09-03
Anticipated expiration: 2006-07-02

Abstract

The utility model relates to a bidirectional sealed high temperature butterfly valve. The utility model can cut off medium in a forward and a backward directions to realize bidirectional seal, and can also resist high temperature, high voltage, corrosion and abrasion. The utility model is characterized in that the sealing surface of a butterfly plate adopts an oblique eccentric asymmetric circular arc camber, and the seal of an auxiliary static sealing position adopts a steel belt flexible graphite winding type cushion ring. A metal sealing ring has a peculiar section shape, and the metal sealing ring and a cone-shaped pressing ring can form an annular spring. The utility model has the advantages that the automatic seal can be realized through the elasticity of the metal sealing ring and the pressure of the medium in a pipeline, and thus, the bidirectional sealing performance is reliable. The utility model is suitable for various gases and liquids, and the temperature of the gases and the liquids is lower than 600 DEG C. and the pressure is lower than 2.5 MPa.

Description

A kind of bidirectional sealed high temperature butterfly valve

The utility model relates to a kind of bidirectional sealed high temperature butterfly valve.

Known patent number is 93228136.2 two-way high-temperature metal seal butterfly valve, its butterfly plate is two eccentric spheric structures, though the butterfly plate of this structure can close tighter and tighter when fitting with metal o-ring, but it is very little to close tight more amount more, particularly to the butterfly valve of super-large diameter, this to close tight more amount more littler, therefore can not produce enough pretension specific pressures sometimes, guarantees the initial sealing of sealing surface.Simultaneously the butterfly plate of this structure is at valve opening with when closing, whole sealing surface all will with metal o-ring generation mutual friction mutually, thereby the friction stroke of sealing pair is big, wearing and tearing are inevitable serious, sealing pair can very fast loss of seal ability, thereby has influenced the sealing and the reliability of butterfly valve greatly, in addition, when pad loses efficacy, may produce external leakage in this patent, thereby have two place's external leakage hidden danger in the sealing pair structure of this patent.

The purpose of this utility model is to provide a kind of bidirectional sealed high temperature butterfly valve, overcomes the deficiencies in the prior art, and the sealing pair wearing and tearing of butterfly valve are reduced, and forward and reverse sealability is reliable.

The technical solution of the utility model realizes with following scheme:

Butterfly plate double eccentric gear of the present utility model in valve body, the butterfly plate sealing surface is that tiltedly eccentric asymmetric garden arc surface, metal o-ring are " recessed " font, be installed in the groove of valve body, taper trim ring and metal o-ring constitute one group of annular spring, and be fixed that circle is fixed in the valve body recess, realizing by steel band graphite wrap style packing ring that static seal, metal o-ring and butterfly plate applying constitute between metal o-ring and the valve body can two way sealed, and resistant to elevated temperatures seal arrangement is arranged again.

The utility model compared with prior art, its advantage is as follows:

1, butterfly plate can close tighter and tighter when closing, and it is very big to close tight more amount more, no matter be small-bore, heavy caliber, or the butterfly valve of super-large diameter, can both produce enough pretightening unit sealing loads, thereby sealability is reliable.

When 2, butterfly valve cut out, the part of butterfly plate sealing surface and metal o-ring were close before this, subsequently can very fast mutual applying, on the contrary, and when butterfly valve is opened, butterfly plate sealing surface partial disengagement metal o-ring before this, the very fast subsequently metal o-ring that breaks away from fully.Therefore, the friction stroke of sealing pair relative movement is especially little, and the rubbing surface of sealing pair is also less, and the wearing and tearing of sealing pair are little like this, long service life, and the friction torque of butterfly valve seal face is little, rapid operation.

3, metal o-ring and taper ring can constitute metalloid annular spring structure, thereby rigidity is big, are difficult for producing plastic deformation.

4, the sealing pair structure does not have external leakage hidden danger.

With reference to accompanying drawing embodiment, the utility model is further described:

Fig. 1: bidirectional sealed high temperature butterfly valve structural representation

Fig. 2: partial enlarged drawing.

Fig. 3: butterfly plate sealing surface structure schematic representation.

Fig. 4: steel band graphite wrap style gasket construction schematic representation.

Fig. 5: metal o-ring structural representation.

Among Fig. 1-5: go up valve shaft (1), go up radiating seat (2), Gland (3), V-type Expanded graphite (4), axle sleeve (5), Packing seat (6), retainer ring (7), taper ring (8), metal o-ring (9), steel band graphite wrap style packing ring (10), taper pin (11), butterfly plate (12), lower valve shaft (18), valve body (14), following radiating seat (15) Expanded graphite (16), stainless steel belt (17).

Bidirectional sealed high temperature butterfly valve by last valve shaft (1), go up radiating seat (2), metal o-ring (9), butterfly plate component such as (12) are formed that the axis hole that communicates is up and down arranged on the valve body (14), axle sleeve (5) is arranged in it, axle sleeve (5) supports valve shaft (1), lower valve shaft (13), axle sleeve (5) respectively all V-type Expanded graphite (4) up and down, after Gland (3) compresses, can stop medium to enter in the axle sleeve (5) and prevent the medium external leakage.

The sealing surface of butterfly plate (12) is the symmetrical center line of the eccentric butterfly plate in the center of circle (12) of tiltedly eccentric asymmetric garden arc surface, garden arc, the tilt angle that the center of circle is positioned at a tapered plane, tapered plane is J, the distance of tapered plane off-axis centerline hole is e3, the circle that it is Φ that the center of circle of each garden, cross section arc can form a diameter.

The sectional shape of metal o-ring (9) is " recessed " font, the tapered plane of the tapered plane on top and taper ring (8) is fitted mutually, steel band graphite wrap style packing ring (10) is equipped with in the bottom of metal o-ring (9), retainer ring (7) is with metal o-ring (9), taper ring (8), steel band graphite wrap style packing ring (10) is fixed in the groove of valve body (14), and metal o-ring can float vertically, can radially float again, guaranteed metal o-ring (9) and butterfly plate (12) when high temperature not by stuck mutually, and can avoid the sealing surface seal pressure excessive and destroy sealing surface.

All be drilled with circular hole on taper ring (8) and the retainer ring (7), pressure medium can enter in the Baltimore groove of metal o-ring (9) from these circular holes, when requiring butterfly valve oppositely to block medium, the actual seal pressure of sealing pair also can increase with the increase of pressure, thereby realizes from motive sealing.

During bidirectional sealed high temperature butterfly valve work, last valve shaft (1) can be connected with valve actuator, by the thermolysis of last radiating seat (2), makes drive unit be far apart the high-temperature temperature field.Last valve shaft (1) rotates in 0～90 ° of scope driving butterfly plate (12) under the effect of valve actuator, thereby realizes the opening and closing of bidirectional sealed high temperature butterfly valve, the purpose that reaches sealing and regulate medium.

Claims

1, a kind of bidirectional sealed high temperature butterfly valve, it comprises butterfly plate (12), valve body (14), metal o-ring (9), steel band graphite wrap style packing ring (10), taper trim ring (8) and retainer ring component such as (7), it is characterized in that: steel band graphite wrap style packing ring (10) is loaded in the groove of valve body (14), form the static seal pair with the bottom of metal o-ring (9), metal o-ring (9) and taper trim ring (8) are for the conical surface contacts, and retainer ring (7) is with taper trim ring (8), metal o-ring (9) and steel band graphite wrap style packing ring (10) are fixed in the groove of valve body (14) vertically.

2, bidirectional sealed high temperature butterfly valve according to claim 1 is characterized in that: the sectional shape of metal o-ring (9) is " recessed " font, and the upper plane of " recessed " font is a tapered plane.

3, bidirectional sealed high temperature butterfly valve according to claim 1, it is characterized in that: butterfly plate (12) is two dull and stereotyped truss overflow-type structures, sealing surface is an oblique eccentric asymmetric garden arc surface, and promptly the butterfly plate symmetry center is departed from the center of circle of each circular arc on the arc surface, and each center of circle is positioned at same tapered plane.

4, bidirectional sealed high temperature butterfly valve according to claim 1 is characterized in that: steel band graphite wrap style packing ring (10) is to be entwined mutually by stainless steel belt and Expanded graphite, and the Expanded graphite height is a little more than the steel band height.