Urgently repairable ball valve seat with double-piston effect

Abstract

The invention discloses a ball valve seat with a double-piston effect. Valve seats currently used for sealing between a valve body and a valve ball are mostly in single sealing, and the valve seats are poor in sealing performance and short in service life, and are not durable. The urgently repairable ball valve seat with the double-piston effect is characterized in that the valve seat comprises a metal valve seat inner ring positioned on the inner side of the valve seat and a metal valve seat outer ring wrapped outside the valve seat inner ring, the valve seat outer ring is limited on the valve body, a plurality of high-temperature alloy springs annularly distributed and a first seal ring used for sealing between the valve seat and the valve body are arranged between the outer side of the valve seat outer ring and the valve body, an annular hook head and an annular notch arranged on the surface of the valve seat inner ring are formed on the inner side of an upper portion of the valve seat outer ring, a circle of soft seal elements are arranged in the notch, and a high wear-resistant metal layer is coated on the inner side face of the valve seat inner ring and the hook head. The valve seat mainly uses hard sealing with soft sealing as assistance, double-sealing of an upper section and a lower section is adopted, and sealing performance of the ball valve seat with the double-piston effect is reliable and durable.

Description

technical field [0001] The invention relates to the field of pressure vessels, in particular to an emergency repairable ball valve seat with double piston effect. Background technique [0002] Ball valves for pipelines are used in gas transmission and liquid infusion in natural gas main roads, gas terminals, offshore platforms, airports, etc. The valve seat is an important part of the ball valve. At present, most of the valve seats used for sealing between the valve body and the valve ball are single-layer seals, which have poor sealing performance, short service life, and are not durable, and cannot meet the high requirements of reliable and durable sealing in some special applications. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide a ball valve seat with reliable sealing, durability and double-piston effect that can be repaired urgently. [0004] For ...

AI Technical Summary

Problems solved by technology

At present, most of the valve seats used for sealing between the valve body and the valve ball are single-layer seals, which have poor sealing performance, short service life, and are not durable, and cannot meet the high requirements of reliable and durable sealing in some special applications.

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