Valve seat structure adaptive to high and low temperature, and ball valve with valve seat structure

Abstract

The invention relates to a valve seat structure adaptive to high and low temperature, and a ball valve with the valve seat structure. The valve seat structure comprises a valve body, a ball body and avalve seat component, and the valve seat component is arranged between the valve body and the ball body; the valve seat component comprises a seat retainer, a deformation sealing gasket, a spring seat, a spring and a threaded seat; the seat retainer and the spring seat are arranged between the ball body and the valve body, and the seat retainer is in seal fit to the ball body under the effect ofthe spring; the other end, relative to the ball body, of the seat retainer is fixedly connected to the inner diameter end of the deformation sealing gasket, and the threaded seat is arranged on the seat retainer in a sleeving manner; and the deformation sealing gasket is in seal fit to the valve body under the effect of the threaded seat. According to the valve seat structure, the seat retainer and the inner diameter position of the deformation sealing gasket are connected integrally, and the deformation sealing gasket is automatically deformed under the effect of axial thrust; the seat retainer is pushed to the ball body under the effect of the spring, so that the seat retainer is automatically moved for ensuring that the sealing surface is attached to the spherical surface of the ball body; and thus, the valve seat is free of deformation influence caused by temperature change, and adaptive to different temperatures.

Description

technical field [0001] The invention relates to the technical field of valves, in particular to a high and low temperature adaptive valve seat structure and a ball valve equipped with the valve seat structure. Background technique [0002] The ball valve has the advantages of 90° quick switch and small flow resistance, and is often used as a cut-off device in the pipeline. With the continuous development of coal chemical industry, oil product upgrading, liquefied natural gas and other industries, in addition to the demand for normal temperature valves, higher requirements are put forward for valves in high temperature, low temperature or high and low temperature changing working conditions. [0003] The seat structure of normal temperature ball valves is usually sealed with non-metallic rubber. The rubber body has good elasticity and is easy to achieve sealing at room temperature, but general rubber is usually not resistant to high and low temperatures. become brittle. Hig...

AI Technical Summary

Problems solved by technology

[0003] The seat structure of normal temperature ball valves is usually sealed with non-metallic rubber. The rubber body has good elasticity and is easy to achieve sealing at room temperature, but general rubber is usually not resistant to high and low temperatures. become brittle

High-temperature valves are usually sealed with high-temperature resistant graphite packing, but its sealing performance has high requirements on the sealing surface, and its reliability is low, and the graphite packing is not elastic enough at low temperatures. If the continuous pre-load is lost, the sealing will not be achieved.

Cryogenic and ultra-low temperature ball valves are usually sealed with LipSeal lip seal rings. The hardening effect of low temperature on non-metallic materials will greatly increase the difficulty of LipSeal sealing. The surface requirements are extremely high, and manufacturing is difficult. Sealing stability and reliability are the first in the valve industry today. Big problem, and LipSeal's non-metallic sealing jacket also makes it unusable for high temperature conditions

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