CN201071960Y

CN201071960Y - Clamp butterfly type check valve

Info

Publication number: CN201071960Y
Application number: CNU2007201441242U
Authority: CN
Inventors: 戴贤才; 李学飞
Original assignee: SHANGHAI KAI-GONG VALVE Co Ltd
Current assignee: SHANGHAI KAI-GONG VALVE Co Ltd
Priority date: 2007-07-26
Filing date: 2007-07-26
Publication date: 2008-06-11
Anticipated expiration: 2017-07-26

Abstract

The utility model relates to a wafer butterfly type check valve. The pin axle, limiting pin and other parts in the traditional check valve structure adopt outer installed structures, and leakage is easy to be caused, the utility model adopts the technology proposal that an inner installed type check valve without external processing holes is realized, the utility model is composed of a valve body, a valve flap, a pin axle, a limiting rod, a supporting block, a pressing plate and a torsion spring, wherein the pin axle, the limiting rod and the valve flap are installed in the cavity of the valve body, the positioning is accurate and reliable, and the potential leakage points at the end part of the pin axle sealed with a screw plug do not exist. The utility model has the advantages that the difficult problem of the leakage of the valve body is resolved, the sealing reliability is improved, and the utility model is particularly suitable for the combustible occasion, the detonatable occasion, the poisonous occasion and the noxious occasion where medium is not permitted to externally leak.

Description

A kind of to the folder butterfly check valve

Technical field

The utility model relates to a kind of valve mechanism, particularly relates to a kind of check valve structure.

Background technique

On flowing medium pipelines such as oil, petrochemical industry, some media do not allow and leak outside, particularly there is occasion such as inflammable, explosive, poisonous, harmful more not allow medium to leak outside, parts such as the bearing pin in traditional check valve structure, position limit pin all are the outer structures of packing into, the mounting hole that is processed with these parts outside valve body is the potential leak source that leaks, so traditional safety check affects the safe, reliable of pipeline operation.

Summary of the invention

In order to overcome the deficiency that prior art exists, overcome the pipeline external leakage phenomenon that exists because of check valve structure in service, improve the Security of pipeline operation, the purpose of this utility model provides a kind of to the folder butterfly check valve, the technical solution of the utility model is the integral check valve of a kind of valveless external body machining hole of design, the technical solution of the utility model is to come specific implementation by following technical measures, a kind of valve body that comprises, flap, bearing pin and spring, only allow a kind of of medium one-way flow to the folder butterfly check valve, it is characterized in that it is by valve body 1, flap 2, bearing pin 3, position-limited lever 4, support block 5, pressing plate 6 and torsion spring 7 are formed, wherein: isometric columniform position-limited lever and bearing pin, one on the other respectively in valve body 1 inner chamber two support block 5 upper supports at two ends fix; The back be semicircular two support block 5 relative fixed in valve body 1 in the semi-circular recesses on the wall of chamber, both sides, and pressing plate 6 externally threaded by having, ring-type is threaded with valve body 1 and is fixed support block 5; A pair of semicircle butterfly flap 2 less than valve body 1 cavity internal diameter passes through the fixedly connected of bearing pin 3, is installed on the inner chamber valve port shoulder of valve body 1, has torsion spring 7 to connect between butterfly flap 2 and the bearing pin 3, with the elastic closure that guarantees butterfly flap 2, reliable non-return.

This kind is inbuilt to the folder butterfly check valve leak source that do not leak.During the pipeline operation, when the medium forward flowed into valve body, flap overcame torsion spring torsion under the effect of medium power, and two fan flaps rotate around bearing pin, and it is spacing to forward the position-limited lever place to, valve open, and pipeline is open-minded; Otherwise after pipeline front end medium decompression, flap is closed rapidly under the effect of torsion spring and medium back-pressure, stops medium to flow backwards.

Applicable scope of the present utility model is: latus rectum is DN100～DN900; Pressure is 2.0MPa～10.0MPa.

The utility model can be used for fields such as petrochemical industry, metallurgy, electric power, light industry, food, is applicable to multiple media such as water, steam, oil product, acids, strong oxidizing property medium and urea.

Good effect of the present utility model is that inbuilt structure compares with conventional pin axle, the position limit pin structure of packing into outward, valve body has reduced by two potential leak sources that leak, solved the difficult problem that high pressure valve valve body plug screw pad leaks outside, adopt the built-in type structure to the folder butterfly check valve, can thoroughly eliminate outer leak source, improve the reliability of sealing, realized pipeline external security, cleaning, civilization.

Description of drawings

Fig. 1, be the utility model to folder butterfly check valve structural representation (plan view);

Fig. 2, be the utility model to folder butterfly check valve structural representation (plan view).

Each legend mark is expressed as follows part respectively in the accompanying drawing:

1---valve body, 2---flap, 3---bearing pin, 4---position-limited lever, 5---support block, 6---pressing plate, 7---torsion spring;

Embodiment

The utility model is described in further detail below in conjunction with drawings and Examples:

Present embodiment is that a kind of model that is applied on the petrochemical system is H76H-150C to the folder butterfly check valve, comprises valve body 1, flap 2, bearing pin 3, position-limited lever 4, support block 5, pressing plate 6 and spring 7.Install by structure shown in Figure 1, wherein: valve body 1 is that the trade mark is the Cast Steel of WCB, and latus rectum is ф 100mm, and valve is long to be 73mm, and the inner chamber middle part of valve body 1 is processed with sealing shoulder, is processed with semi-circular recesses on the two side on the top of inner chamber; Two backs are that semicircular cylinder support block 5 cooperates the location in valve body 1 inner chamber both sides semi-circular recesses, and external diameter is that ф 120mm, thickness are that the annular pressing plate 6 of 10mm is fixed support block 5 with suitable for reading being threaded of valve body 1 inner chamber; Diameter is that the position-limited lever 4 of ф 6mm and bearing pin 3 that diameter is ф 6mm are fixed on the support block 5 respectively up and down; A pair of radius is that 3 pairs of folders of semicircle butterfly flap 2 and bearing pin of R51mm are connected, by diameter is that the torsion spring 7 of ф 1.5mm steel wire coiled is installed between flap 2 and the bearing pin 3, rely on the spring force of torsion spring 7 flap 2 to be pressed on the sealing shoulder of valve body 1, must be accurately, reliably locate, to guarantee sealing the folder butterfly check valve.Valve body 1 and flap 2 are Cast Steel in the above part, bearing pin 3 and position-limited lever 4 Wei Bu Rust steel, and pressing plate 6 is made for quality carbon steel.

This kind is inbuilt to the folder butterfly check valve leak source that do not leak.When the medium forward flowed into valve body, flap overcame torsion spring torsion under the effect of medium power, and two fan flaps rotate around bearing pin, and it is spacing to forward the position-limited lever place to, valve open, and pipeline is open-minded; Otherwise after pipeline front end medium decompression, flap is closed rapidly under the effect of torsion spring and medium back-pressure, stops medium to flow backwards.

Claims

One kind comprise valve body, flap, bearing pin and spring, only allow the medium one-way flow a kind of to the folder butterfly check valve, it is characterized in that it is made up of valve body (1), flap (2), bearing pin (3), position-limited lever (4), support block (5), pressing plate (6) and torsion spring (7), wherein: isometric columniform position-limited lever (4) and bearing pin (3), two support blocks in two ends (5) upper support in valve body (1) inner chamber is fixed respectively one on the other; The back be semicircular two support blocks (5) relative fixed in valve body (1) in the semi-circular recesses on the wall of chamber, both sides, and pressing plate (6) externally threaded by having, ring-type is threaded with valve body (1) and is fixed support block (5); A pair of semicircle butterfly flap (2) less than valve body (1) cavity internal diameter is fixedly connected by bearing pin (3), be installed on the inner chamber valve port shoulder of valve body (1), the torsion spring (7) that guaranteed butterfly flap (2) can elastic closure between flap (2) and the bearing pin (3) is connected.
2. according to claim 1 a kind of to the folder butterfly check valve, it is characterized in that described Applicable scope to the folder butterfly check valve is: latus rectum is DN100～DN900; Pressure is 2.0MPa～10.0MPa.