A New Bellows Sealed Ball Valve

Abstract

The invention discloses a novel sealing ball valve with corrugated pipes. A valve seat assembly A and a valve seat assembly B are arranged on the two axial sides of a valve body respectively and respectively comprise a valve seat body, each valve seat body is provided with a sealing ring forming a sealing pair with a ball body, two corrugated pipes, namely the corrugated pipe I and the corrugated pipe II are installed on the outer ring of each valve seat body in a sectional mode and a sleeving mode and are welded to the two sides of a holder respectively, the other end of each corrugated pipe I is welded to the step surface on the outer ring of the corresponding valve seat body, the other end of each corrugated pipe II is welded to a valve seat check ring, the inner diameters of the corrugated pipe I and the corrugated pipe II of the valve seat assembly A are greater than the inner diameter of the sealing ring of the valve seat assembly A, the inner diameter of the corrugated pipe I of the valve seat assembly B is smaller than the inner diameter of the sealing ring of the valve seat assembly B, and the inner diameter of the corrugated pipe II of the valve seat assembly B is greater than the inner diameter of the sealing ring of the valve seat assembly B. The novel sealing ball valve has the beneficial effect of being applicable to severe working conditions, and valve seats on one side or both sides can realize the bidirectional sealing function.

Description

Technical field [0001] The invention relates to a ball valve, in particular to a ball valve sealed by a bellows. Background technique [0002] At present, ball valves have been widely used in pipeline systems. When the ball valve transports volatile and dangerous liquid media, due to the increase in temperature, the middle chamber of the valve body often causes a backlog. At this time, the middle chamber needs to be depressurized. [0003] There are three types of existing ball valve seats, which are 1) double valve seats are in the form of one-way sealing (DDB), that is, when the pressure of the medium in the middle cavity rises, it can be discharged into the upstream and downstream pipelines through the double-sided valve seats, Perform pressure relief in the middle chamber; 2) Double-seat bidirectional sealing (DIB-1) form, that is, when the medium pressure in the middle chamber rises, the valve seats and the ball on both sides can still achieve sealing, preventing the me...

AI Technical Summary

Problems solved by technology

In the ball valves of the prior art, rubber elastic sealing elements are usually used to realize this function, but the rubber sealing elements are not resistant to high temperature and low temperature, and can only be realized at normal temperature, and cannot be used under high and low temperature conditions.

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