CN2637843Y

CN2637843Y - Ball valve

Info

Publication number: CN2637843Y
Application number: CN 02287181
Authority: CN
Inventors: 郭俊峰; 赵华良
Original assignee: JIADA VALVE CO Ltd FUNING COUNTY
Current assignee: JIADA VALVE CO Ltd FUNING COUNTY
Priority date: 2002-11-16
Filing date: 2002-11-16
Publication date: 2004-09-01
Anticipated expiration: 2012-11-16

Abstract

A ball valve comprises a valve body, a valve stem, a truncated sphere, a valve seat, etc. The valve body is a half spherical structure; the seal surface of the spherical cap is welded with cemented carbide in a piling way that is arranged in the inner vanity of the valve body and is connected with a transmission mechanism and the valve body by the valve stem and a spherical body; the truncated sphere does eccentric motion in the inner vanity of the valve body; the valve seat is made of cemented carbide and is connected with the valve body; the valve seat and the truncated sphere are hard sealed. The ball valve has good seal, light abrasion, long service life, easy operation, being quiet and the function of throttle.

Description

A kind of ball valve

The utility model relates to a kind of ball valve.

Ball valve mainly with spheroid as open-shut device, it mainly contains compositions such as valve body, valve seat, spheroid, valve rod, handle, scratches stationary axle by spheroid in valve body and rotates 90 degree and realize opening and closing, and plays the conducting of convection cell and block in pipeline.The ball valve that generally uses mainly contains floating ball valve and fixing ball valve two big classes in the market, and Float ball valve is poor reliability in most cases, and the life-span is short; Though and the Fixed ball valve purposes is wider, because sealing pair very easily weares and teares, the life-span is also shorter, and in switching process, moment of rotation is big simultaneously, and particularly the heavy caliber ball valve is easy to generate vortex flow, causes self-excited vibration and noise.

The purpose of this utility model just is to provide a kind of wear-resistant, life-span length, processing ease, ball valve that noise is light.

The purpose of this utility model is achieved in that this ball valve is made up of valve body, valve seat, valve rod, intercept sphere etc., the whole spheroid of ordinary ball valve is changed over hemispheric intercept sphere, intercept sphere is connected with being connected to of valve rod is eccentric, the soft seal valve seat of ordinary ball valve is changed over the hard seal valve seat of cemented carbide, simultaneously, on corresponding intercept sphere spherical crown also built-up welding cemented carbide is arranged.Because above-mentioned structural change has been arranged, the utility model has produced the following characteristics: because valve rod is connected with spheroid is eccentric, spheroid has only moment to contact in opening-closing process with valve seat, and light abrasion, keying are flexibly; Because valve seat and ball seal face are intermetallic hard sealing, can be high temperature resistant, wear-resistant, the life-span is long; Owing to adopted hemispheric intercept sphere structure, eliminated the eddy current that medium produces in opening-closing process, alleviated vibration and noise, simultaneously, also increased the function of throttling.

Be described further below in conjunction with drawings and Examples:

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is the intercept sphere schematic representation;

Sequence number is expressed as follows respectively shown in the accompanying drawing: 1, valve body; 2, valve rod; 3, intercept sphere; 4, valve seat; 5, seal washer; 6, spheroid axle; 7, alloy sealing surface.

As shown in the figure, the utility model is mainly by valve body 1, valve rod 2, intercept sphere 3, valve seat 4 compositions such as grade, intercept sphere 3 places valve body 1 inner chamber, and the upper end links to each other with valve rod 2, and valve rod 2 links to each other with the upper end driving mechanism, the lower end links to each other with valve body 1 by spheroid axle 6, spheroid axle 6 is connected on the line of eccentricity of spheroid 3 with valve rod 2, and intercept sphere 3 is hemispherical structure (as Fig. 2), and built-up welding has alloy sealing surface 7 on its spherical crown; Valve seat 4 is made with valve body 1 for hardfacing alloy and is linked to each other, and in order to eliminate spheroid and valve seat at the sealing micro-elastic force of moment, simultaneously, makes sealing more reliable, at the back side of valve seat 4 seal washer 5 is arranged.The opening-closing process of this ball valve is such, pulls handwheel, can drive intercept sphere by valve rod and rotate in the valve body chamber, when closing, owing to being eccentric reason, sealing spherical crown and valve seat only in a flash just can contact seals what close, and subsides are tight more more, can reach airtight requirement fully; During unlatching, after sealing spherical crown and valve seat left, whole spheroid just can not contact with valve seat, therefore, opens very convenient.

Claims

1, a kind of ball valve, form by valve body, valve seat, valve rod, intercept sphere etc., it is characterized in that: intercept sphere (3) places valve body (1) inner chamber, the upper end links to each other with valve rod (2), the lower end links to each other with valve body (1) by spheroid axle (6), and spheroid axle (6) is connected on the line of eccentricity of intercept sphere (3) with valve rod (2); Valve seat (4) is made with valve body (1) for hardfacing alloy and is linked to each other; At valve seat (4) back side seal washer (5) is arranged.

2, a kind of ball valve according to claim 1 is characterized in that: described intercept sphere (3) is hemispherical structure, and built-up welding has alloy sealing surface (7) on the spherical crown of intercept sphere.