CN2315365Y

CN2315365Y - Double eccentric butterfly valve lined with fluoroplastic

Info

Publication number: CN2315365Y
Application number: CN 97246428
Authority: CN
Inventors: 贾鹤森; 张震洲
Original assignee: WENZHOU CORROSIONPROOF APPARATUS FACTORY
Current assignee: WENZHOU CORROSIONPROOF APPARATUS FACTORY
Priority date: 1997-12-05
Filing date: 1997-12-05
Publication date: 1999-04-21
Anticipated expiration: 2007-12-05

Abstract

The utility model relates to a double eccentric butterfly valve lined with fluoroplastic, a valve flap of which is arranged in a double eccentric way according to a valve shaft. A sealing ring which is tightly clamped by a pressing ring is arranged on a valve body. The fluoroplastic layer of the sealing ring lined on a ring core which is made of spring steel, and the cross section of the ring core forms a hook shape, wherein the fluoroplastic layer of a hook pole part is a clamp installing surface; the fluoroplastic layer of the outer side of the hook part is a sealing surface; a clearance for the deformation of the hook part is reserved between the fluorine plastic layer of the inner side of the hook part and the fluoroplastic layer of the valve body. When the sealing ring is submitted to thrust force caused by closing the valve flap, both the hook part of the ring core and the fluoroplastic layer lined at the hook part can generate elastic deformation, and can supply bigger sealing force to a sealing pair. Thus, the sealing performance of the double eccentric butterfly valve lined with fluoroplastic is strengthened.

Description

The lined with fluoroplastic double eccentric butterfly valve

The utility model relates to a kind of lined with fluoroplastic double eccentric butterfly valve.

The sealing surface of the flap of lined with fluoroplastic double eccentric butterfly valve is after contacting with the seal ring that is installed on valve body, when flap continues to close, the sealing surface of flap has an amount of feed radially with respect to seal ring, therefore, the sealability of lined with fluoroplastic double eccentric butterfly valve is better than lined with fluoroplastic symmetry butterfly valve theoretically, but, the sealability of lined with fluoroplastic double eccentric butterfly valve also depends on the structure of seal ring, known seal ring also is a kind of lined with fluoroplastic structure, it is that the deformation resilience power that relies on fluorine to mould layer seals, because this spring-back force is little, therefore influenced the further raising of lined with fluoroplastic double eccentric butterfly valve sealability.

The purpose of this utility model provides the better lined with fluoroplastic double eccentric butterfly valve of a kind of sealability.

Solution of the present utility model is that the fluorine of described seal ring is moulded the section that layer lining make at spring steel and become on the circle core of hook-type, it is to clamp attachment face that the fluorine of its centre circle core shank portion is moulded layer, it is sealing surface that the fluorine in the circle core hook portion outside is moulded layer, and the fluorine of circle core hook portion inboard is moulded layer and moulded the gap of leaving between the layer for hook portion deformation with the fluorine of valve body.

The hook portion of above-mentioned seal ring comes down to a cantilever, because the circle core has elasticity, and the hook portion inboard is with leaving the gap between the valve body, therefore, during thrust when seal ring is subjected to flap and closes, the hook portion of circle core and lining are moulded layer at the fluorine of this one all can produce elastic strain, and offers the bigger sealing force of sealing pair, certainly will strengthen the sealability of lined with fluoroplastic double eccentric butterfly valve like this.

Illustrate particular content of the present utility model below in conjunction with drawings and Examples.

Fig. 1: structural drawing of the present utility model;

Fig. 2: A-A sectional view.

As shown in the figure, the valve body 1 of lined with fluoroplastic double eccentric butterfly valve described in the utility model, flap 2, valve shaft 3, seal ring 4 all is lined with fluorine with the surface that trim ring 5 contacts with medium and moulds layer 6, the geometrical center of flap 2 is with respect to 3 pairs of eccentric settings of valve shaft, 2 of seal rings are clamped and installed on the valve body 1 by trim ring 5, and the fluorine of seal ring 4 is moulded layer 6 lining and is become on the circle core of hook-type at the section of spring steel making, it is to clamp attachment face that the fluorine of its centre circle core shank portion 7 is moulded layer 6, it is sealing surfaces that the fluorine in circle core hook portion 8 outsides is moulded layer 6, and the fluorine of circle core hook portion 8 inboards is moulded layer 6 and moulded the gap delta that leaves between the layer 6 for 8 deformation of circle core hook portion with the fluorine of valve body 1.What present embodiment was described is the butterfly valve of wafer type structure, valve body 1 is assembled by two-part, the fluorine of valve body 1 part is moulded 6 integral lining of layer, the sealing of valve shaft 3 and drive unit be design routinely all, butterfly valve is with the also design routinely of linkage structure of other member, and the fluorine in seal ring circle core hook portion 8 outsides is moulded the sealing surface that layer 6 forms arc.

Claims

1, a kind of lined with fluoroplastic double eccentric butterfly valve, its valve body, flap, valve shaft, seal ring all is lined with fluorine with the surface that trim ring contacts with medium and moulds layer, the geometrical center of flap is with respect to two eccentric settings of valve shaft, seal ring then is clamped and installed on the valve body by trim ring, it is characterized in that: the fluorine of seal ring (4) is moulded layer (6) lining and is become on the circle core of hook-type at the section of spring steel making, it is to clamp attachment face that the fluorine of its centre circle core shank portion (7) is moulded layer (6), it is sealing surface that the fluorine in circle core hook portion (8) outside is moulded layer (6), and the inboard fluorine of circle core hook portion (8) is moulded the fluorine of layer (6) same valve body (1) and moulded the gap of leaving between the layer (6) for the deformation of circle core hook portion (8) (δ).