CN2504455Y - Three-eccentric metal sealing butterfly valve - Google Patents

Abstract

The utility model discloses a three-eccentric butterfly valve of a metal sealing type, which comprises a valve body, a butterfly plate arranged in the valve body, a metal sealing ring arranged on the butterfly plate and a valve rod. The utility model is characterized in that the metal sealing ring forms an integral oblique cone structure, and the valve rod is arranged at the eccentric position of the valve body, the butterfly plate and the metal sealing ring. Because the utility model adopts the metal sealing ring with the integral oblique cone structure and the valve rod is arranged at the eccentric position of the valve body, the butterfly plate and the metal sealing ring, the three-eccentric butterfly valve has no theory-friction in the presses of opening and closing, has the advantages of reliable seal and long serving life, can also bear high temperature and high pressure, has the functions of fire prevention and explosion prevention, and meanwhile, has laborsaving and portable operation by adopting torque to seal. The non-leakage can be ensured in the process of using for a long time. The sealing ring forms an integral structure, has any interlayer structure, and has no pollution to mediums.

Description

The three eccentric metal seal butterfly valve

Technical field

The utility model relates to the valve of work under a kind of high temperature and high pressure condition, specifically a kind of three eccentric metal seal butterfly valve.

Background technique

Existing butterfly valve mostly is the soft seal form, and the metallic seal form is also arranged.For soft seal, one of its sealing pair adopts rubber, because " shedding tears " and squeeze-out phenomenon easily take place under the effect of high pressure rubber heat resistance finite sum, can not use on the pipeline under the high temperature and high pressure condition at all.And existing metallic sealing butterfly valve, its metal o-ring adopt more " U " shape, " O " shape or "? " the shape pattern, and be thin walled structures.Though the valve of this structure can bear certain temperature (about 300 ℃), can not bear bigger pressure,, the valve of this thin walled structures cause valve seal to lose efficacy because being easy to produce distortion under the effect of High Temperature High Pressure.On structural design, the metallic sealing butterfly valve of above-mentioned three kinds of forms mostly is position seals, promptly reaches compressing between the sealing pair by certain deformation (interference), and the form by line contacts between the sealing pair, and area of contact is few yielding.Also just because of this reason, being doomed life-span of this valve can not be oversize, and the line contact makes seal ring be easy to produce deformation under the effect of High Temperature High Pressure between the sealing pair; Position seals causes valve to have bigger friction and wearing and tearing in opening process, wearing and tearing along with metal, valve has also just lost sealability, especially under the effect of High Temperature High Pressure, the erosion effect of fluid in addition, this wearing and tearing will be accelerated greatly, and clearly the valve of this thin walled structures is that the pressure of the operating mode that is not suitable for High Temperature High Pressure, especially medium is during greater than 5Mpa.In recent years, a kind of eccentric structure butterfly valve appears on the market, also claim it is metallic sealing butterfly valve, but its seal ring is composite material (asbestos interlayer or a graphite interlayer), the seal ring serviceability temperature of this interlayer is generally in 300 ℃, when temperature surpassed 300 ℃, because different, each material deformation amount difference of expansion coefficient of interlayer, interlayer must come off; In addition, when valve opening, interlayer washes away down in the brute force of high-pressure medium just in face of medium, and asbestos or graphite interlayer also can come off very soon.This coming off not only can be caused the pollution of medium, also can make seal ring destroyed, and valve seal lost efficacy, and finish working life.

The model utility content

The utility model purpose is to be to provide a kind of three eccentric metal seal butterfly valve that can overcome the existing friction of valve in opening-closing process and can bear High Temperature High Pressure, increase the service life.

The purpose of this utility model can realize by following measure:

The utility model comprises valve body and the butterfly plate that is placed in the valve body, is placed in metal o-ring and valve rod on the butterfly plate, and metal o-ring is an integrated type tilted conical structure, and valve rod is the eccentric position that is placed in valve body, butterfly plate and metal o-ring three.

The utility model is owing to the structure of the metal o-ring that adopts integrated type tilted conical structure, and valve rod is the eccentric position that is placed in valve body, butterfly plate and metal o-ring three.Make to seal valve gear shaper without theoretical friction in opening-closing process reliably, long service life, and can bear High Temperature High Pressure, and have fire prevention, explosion prevention function; Simultaneously, adopt the moment of torsion sealing, rapid operation, light.Can in long-term using process, guarantee zero leakage.Seal ring is a monolithic construction, does not have any sandwich structure, and is pollution-free to medium.

Description of drawings

Accompanying drawing is a schematic representation of the present utility model

Embodiment

As shown in the figure: the utility model comprises valve body 1 and the butterfly plate 4 that is placed in the valve body 1, be placed in metal o-ring 2 and valve rod 5 on the butterfly plate 4, metal o-ring 2 is an integrated type tilted conical structure, valve rod 5 is the eccentric positions that are placed in valve body 1, butterfly plate 4 and metal o-ring 2 threes, metal o-ring 2 is to be fixed on the butterfly plate 4 by trim ring 3 and bolt 6, and metallic shim 7 is adopted in the end face seal of metal o-ring 2.

Working principle of the present utility model is as follows: the utility model is made up of valve body, butterfly plate, metal o-ring and valve rod etc.Metal o-ring is a thick tilted conical structure, and on butterfly plate, valve rod drives the butterfly plate rotary opening and closing by key with bolton, and conical seal ring is passed on moment of torsion for sealing required power with after valve seat contact, acts on 360 and spends on the oblique cone faces.Ingenious design by three off-centre and tilted conical surface, guaranteed that 360 degree conical surface upward pressure angles are greater than angle of friction that material determined, thereby between the seal process sealing pair, have only independent compressing do not have sliding friction, guaranteed the reliability of sealing, prolonged the working life of valve.Because metal o-ring is thick-walled structure, the contact between the sealing pair is the face contact, can guarantee seal ring long-term use and do not produce deformation under the effect of High Temperature High Pressure.Metallic stuffing is adopted in the sealing of valve rod, and sealing is reliable, and is high temperature resistant.

Claims (1)

1, a kind of three eccentric metal seal butterfly valve, it comprises valve body (1) and is placed in the interior butterfly plate (4) of valve body (1), be placed in metal o-ring (2) and valve rod (5) on the butterfly plate (4), it is characterized in that: described metal o-ring (2) is integrated type tilted conical structure, and valve rod (5) is the eccentric position that is placed in valve body (1), butterfly plate (4) and metal o-ring (2) three.