Position:China vacuum equipment network>Information Center>Thick inside back cover is prejudicial two-way recipe of long life of butterfly
Thick inside back cover is prejudicial two-way recipe of long life of butterfly
From;  Author:Stand originally
Current, butterfly a powerful person uses implementation pipeline system to tell the part that reachs flow control as a kind, already got in a lot of domains such as oil, chemical industry, metallurgy, water and electricity very apply widely. Be in fair already in the technique of butterfly a powerful person that know, its are sealed the form uses sealed structure more, sealed material is balata, get together 4 fluorine ethylene. As a result of the limitation of structural feature, incommensurate high temperature resistant, high pressure and anti-corrosive, fight wear away wait for an industry.

Having a kind of more advanced butterfly a powerful person is 3 prejudicial metals hard sealed butterfly a powerful person, body of a powerful person and valve base are the component that join system, v of layer of valve base sealing contact surface is able to bear or endure lukewarm, be able to bear or endure corrode alloy material. Multilayer the soft sealing ring that fold type is fixed it is on board of a powerful person, this kind of butterfly a powerful person and tradition photograph of butterfly a powerful person is more high temperature resistant than having, the operation is light, open shut without grind, when shutting, increase as the moment of force of main transfer machinery will compensate sealed, increased the sealed function of butterfly a powerful person and the good point that prolong service life. But, this kind of butterfly a powerful person still puts in the following problem in use process:

One, as a result of multilayer soft fold type sealing ring forcedly to secure it is on board of a powerful person, should the medium when board of a powerful person often opens position forms the front to erode to its sealing surface, the soft sealed belt in sheet metal interlining suffers after eroding, affect sealed performance directly.

2, the restriction that accepts structural condition this structure is incommensurate make the following valve of the DN200 that open way, the reason is structure of whole of board of a powerful person too thick, flow resistance is great.

3, the principle because of 3 prejudicial structures, between the sealing surface of board of a powerful person and valve base sealed it is to rely on the moment of force of gearing to make board of a powerful person is pressed to valve base. When shedding position, medium pressure jumps over tall sealed extruding to be tightened more. When the as medium pressure accretion when flow path medium is refluent the unit between board of a powerful person and valve base when pressure is less than medium intensity of pressure, sealed begin leak.

High-powered 3 prejudicial and two-way hard sealed butterfly a powerful person, its feature depends on: What narrate valve base sealing ring by seal ring of soft T form two side are multilayer stainless steel piece composition. The sealing surface of board of a powerful person and valve base is inclined conic structure, board of a powerful person is inclined conic surface v is able to bear or endure lukewarm, be able to bear or endure corrode alloy material; Fixed adjusting adjust on the bedspring between annulus pressing plate and pressing plate the structure that bolt assembles one case. This kind of structure compensated the tolerancepublic errand belt between axle sleeve and body of a powerful person and lever of a powerful person effectively to be out of shape in the flexibility below medium pressure, solved valve to carry the sealed problem that exists in the process in the medium of two-way crossing-over. Use soft T two side multilayer stainless steel piece compositive sealing ring, have a metal hard sealed and soft sealed double advantage, no matter be below microtherm and high lukewarm case, all have the sealed property of 0 leakage. The experiment proves Chizheng sheds position (medium flow direction and butterfly board rotational way is same) when, the moment of force that the pressure of sealing surface is gearing and medium pressure are right the action of board of a powerful person arises. A powerful person when increasing to medium pressure board inclined conic surface and extruding of valve base sealing surface are closer, sealed effect is better. When refluent condition, between board of a powerful person and valve base sealed the moment that leans actuating device makes board of a powerful person is pressed to valve base. As the accretion of retrorse medium pressure, the unit between board of a powerful person and valve base when pressure is less than medium intensity of pressure, adjust the bedspring of annulus is out of shape in what suffer the place after carrying to store the close pressure that can compensate board of a powerful person and valve base sealing surface rises to compensate action automatically.
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