CN2319633Y - Dual eccentric high pressure corrosion resistant butterfly bamper - Google Patents

Abstract

The utility model discloses a dual eccentric high pressure corrosion resistant butterfly valve, which relates to a butterfly valve used for controlling fluid flow. The utility model is composed of a valve body, a valve seat, a valve plate, a sealing ring and a press disc, wherein, the valve seat which is in a cylinder shape is fixedly arranged in the central valve seat bore of the valve body, and both ends of the valve seat are provided with openings; the valve plate which is in a circle is arranged in the shaft bore of the valve seat and the valve body by a double eccentricity shaft, and can rotate in the bore; the sealing surface of the outer margin of the valve plate is a spherical cambered surface; the sealing ring which is in a circle is arranged at one side of the valve seat by the press disc, and the sealing ring, the valve body and the valve seat are matched with each other; the sealing surface of the inner side of the sealing ring is a spherical cambered surface, and the sealing surface of the inner side of the sealing ring and the spherical cambered surface of the outer margin of the valve plate are matched with each other. The utility model has the advantages that the processing technology is simple, and the sealing effect is good under high temperature and high pressure conditions.

Description

The anticorrosion butterfly valve of two eccentric high pressure

The utility model relates to a kind of anticorrosion butterfly valve that is used to control fluid flow in the fluid line that is installed in.

Butterfly valve is mounted in the vitals that is used to control fluid flow in the fluid line, at many industrial departments, particularly has a wide range of applications at chemical field.The anticorrosion butterfly valve that is used for corrosive fluid in the prior art has polytype, and the anticorrosion butterfly valve of two spheres promptly is a class wherein and mainly is made of valve body, valve seat and valve plate.Valve seat is the cylindrical shape of both ends open, is made by corrosion resistant polytetrafluoroethylmaterial material, and its inner wall sealing face is spherical cambered surface and works in coordination with the lonely sealing surface of valve plate outer rim ball that its both sides have the axis hole that is used to install valve shaft.Valve plate is circular, anticorrosive PTFE layer outside the plate core constitutes by plate core and cylinder-packing, be installed in the valve seat and can rotate therein by valve shaft and valve seat and valve body axis hole, its outer fringe seal face is spherical cambered surface and works in coordination with valve base inner wall ball arc sealing surface that therefore the anticorrosion butterfly valve of two spheres gains the name.

For the sealing surface that prevents two anticorrosion butterfly valves of sphere is damaged and avoids valve shaft to be subjected to the direct erosion of corrosive fluid, the valve plate of some two anticorrosion butterfly valve of sphere adopts so-called two eccentric structure, be that sealing surface of valve plate is partial to valve shaft one side, and valve shaft depart from the sealing surface of seat centre of sphere.Facts have proved that this two eccentric two anticorrosion butterfly valves of sphere have advantages of good anticorrosion performance, but yet have some technological deficiency.At first, the main material teflon of making valve seat and valve plate easily takes place to soften under high temperature condition, thereby causes sealability to descend.Secondly, because valve seat is full teflon overall structure, squash arc sealing surface is fixed in it, can't the secondary adjustment after the assembling and the matching gap of valve plate outer fringe seal face, thereby undesirable in condition of high voltage lower seal effect.In addition, the matching gap of valve plate and sealing surface of seat relies on the control of machining compact dimensions fully, thereby difficulty of processing is big, the technological requirement height.

The purpose of this utility model promptly is the improvement in addition suitable to the structure of the existing two eccentric two anticorrosion butterfly valves of sphere, and to improve its sealability, particularly the sealability condition of high voltage is under simplified its processing technology simultaneously, the reduction difficulty of processing.

To achieve these goals, the utility model replaces teflon as the material of making valve seat with stainless steel, setting up polytetrafluoroethyl-ne seal ring and the valve plate outer rim ball arc sealing surface that an inner seal face is a spherical cambered surface in the valve base sealing side works in coordination, to realize two ball face sealings, and utilize the stainless steel platen to adjust the magnitude of interference of seal ring inside ball cambered surface and valve plate outer rim ball arc sealing surface matching gap, thereby but change original fixed sealing surface into secondary adjustment sealing surface.This measure not only can significantly improve the sealability under the sealability, particularly condition of high voltage of butterfly valve, and can reduce valve plate, the valve seat processing technology requires and difficulty of processing.Be described in further detail below in conjunction with the technical characteristics of specific embodiment the two anticorrosion butterfly valves of eccentric high pressure of the utility model.

Accompanying drawing 1,2,3 is respectively positive view, left view and the A-A sectional view of the two anticorrosion butterfly valves of eccentric high pressure of the utility model.

With reference to the accompanying drawings 1,2,3, the two anticorrosion butterfly valves of eccentric high pressure of the utility model mainly are made of valve body, valve seat, valve plate, seal ring and platen.Valve body 1 is cast by cast iron, and its central authorities have the circular valve seat hole that is used to install valve seat, and the both sides up and down of valve seat orifice have the axis hole that is used to install valve shaft, are set with axle sleeve 2 and axle sleeve 3 in the axis hole, and the outer end of axis hole has gland 4 and gland 5.Valve seat 6 is a both ends open, and the cylindrical shape of an end flange is made by stainless steel material, is fixed on by screw in the valve seat orifice of valve body central authorities and with valve body to work in coordination, and it has corresponding with the valve body axis hole and be used to install the axis hole of valve shaft in both sides up and down.Valve plate 7 is circular, anticorrosive PTFE layer outside the plate core constitutes by plate core and cylinder-packing, be installed in the valve seat 6 and can rotate therein by upside double-eccentric shaft 8 and downside double-eccentric shaft 9 and valve seat and valve body axis hole, have O type cushion rubber 10 and T type gland 11 on the upside double-eccentric shaft 8, have O type cushion rubber 12 and T shape gland 13 on the downside double-eccentric shaft 9, the outer fringe seal face of valve plate 7 is a spherical cambered surface.Seal ring 14 is a ring, make by polytetrafluoroethylmaterial material, be installed in valve seat flange offside sealed end and work in coordination with valve body 1 and valve seat 6 by ring stainless steel platen 15, its inner seal face is spherical cambered surface and works in coordination with valve plate 7 outer rim spherical cambered surfaces, realizes two ball face sealings.But the elasticity secondary of adjusting platen 15 is adjusted the magnitude of interference of seal ring inside ball cambered surface and valve plate outer rim ball arc sealing surface matching gap.

The utility model processing technology is simple, and high temperature and condition of high voltage lower seal performance are good, so be particularly suitable for the anticorrosion butterfly valve as the control fluid flow.

Claims (1)

1, a kind of anticorrosion butterfly valve of two eccentric high pressure that is used to control fluid flow in the fluid line that is installed in, it is characterized in that constituting by valve body, valve seat, valve plate, seal ring and platen, described valve body is cast by cast iron, its central authorities have the circular valve seat hole that is used to install valve seat, valve seat orifice has the axis hole that is used to install valve shaft in both sides up and down, and the outer end of axis hole has gland; Described valve seat is a both ends open, the cylindrical shape of one end flange, made by stainless steel material, be fixed on by screw in the valve seat orifice of valve body central authorities and with valve body and work in coordination, it has corresponding with the valve body axis hole and is used to install the axis hole of valve shaft in both sides up and down; Described valve plate is circular, and the anticorrosive PTFE layer the plate core outside constitutes by plate core and cylinder-packing, by about the double-eccentric shaft of both sides and valve seat valve body axis hole be installed in the valve seat and can rotate therein, its outer fringe seal face is a spherical cambered surface; Described seal ring is a ring, is made by polytetrafluoroethylmaterial material, is installed in the offside of valve seat flange and works in coordination with valve body and valve seat by the ring stainless steel platen, and its inner seal face is spherical cambered surface and works in coordination with valve plate outer rim spherical cambered surface.

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