Integrated valve seat of metal sealing ball valve

Abstract

The invention discloses an integrated valve seat of a metal sealing ball valve. The valve seat is an indivisible part of a valve body, and a sealing surface of the valve body. The integrated valve seat has the advantages that the possibility of leakage can be eliminated under the condition of high-strength erosion of media or high-temperature thermal expansion, and tiny solid particles cannot enter or be accumulated in a sealing cavity of the valve seat. In addition, the integrated valve seat is applicable to severe conditions such as high temperature, high pressure difference, abrasion, erosion, corrosion, thermal conditions, frequent opening and closing, zero leakage and the like, has a simple in structure and is low in cost.

Description

technical field [0001] The invention relates to a valve seat, in particular to an integrated valve seat of a metal sealing ball valve under severe working conditions. Background technique [0002] In gas-solid, liquid-solid and multiphase flow, strict requirements are placed on valves: high temperature, high pressure difference, wear, erosion, corrosion, thermal cycle, high frequency switching and zero leakage, etc., and the difficulty of sealing metal sealing ball valves It is not between the ball and the sealing surface of the valve seat. Most of the balls are processed by high-precision CNC ball grinding machines, and most of the valve seats are processed by CNC machining centers. The sealing surface of the ball and the valve seat can meet the bubble-level sealing requirements after matching grinding, while the leakage of the metal sealing ball valve mainly comes from the joint between the valve body and the valve seat. Traditional metal sealing ball valve combination se...

AI Technical Summary

Problems solved by technology

One is that the seal between the valve body A1 and the valve seat 3 is a dynamic seal. In the case of strong erosion of the medium or high temperature thermal expansion, the looseness or excessive gap between the valve body A1 and the valve seat 3 is often caused, which eventually leads to valve leakage.

The second is that tiny solid particles are easy to enter and accumulate in the sealing chamber of the combined valve seat, causing the disc spring 4 to fail and unable to compress the valve seat sealing ring 6, which eventually leads to valve leakage

Therefore, the traditional metal-sealed ball valve combined seat is not suitable for severe working conditions of high temperature, high pressure difference, wear, erosion, corrosion, thermal cycle, high frequency switching and zero leakage

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