Pilot-operated type hard seal fixing ball valve

Abstract

The invention discloses a pilot-operated type hard seal fixing ball valve which comprises a valve body, a ball body, a valve seat, a valve cover, a valve rod, a press cover, a filling press cover and a supporting shaft, wherein the ball body is arranged in the valve body; the valve rod passes through the upper part of the valve body and is connected with the ball body, and the valve rod is externally sleeved with the press cover and the filling press cover which are vertically arranged; the valve seat is arranged between the valve cover and the ball body; the supporting shaft passes through the lower part of the valve body and is connected with the ball body; two valve cover sealing rings and a valve seat spring are arranged between the valve cover and the valve seat; the valve cover, thevalve seat and two valve seat sealing rings form a pressure difference cavity; the left side of the valve cover is provided with two left by-pass pipes, the right side is provided with two right by-pass pipes, and the left by-pass pipes and the right by-pass pipes are connected by control valves; the valve rod is also sleeved with a three-way handle head which is communicated with the control valves; and a handle steel pipe is arranged on the valve rod. The invention realizes that the valve seat can be automatically separated from a ball surface when the valve is turned on so as to greatly prolong the service life of the hard seal fixing ball valve and greatly reduce the turn-on torque of the valve.

Description

technical field [0001] The invention relates to a valve, in particular to the sealing and driving of a hard-sealed fixed ball valve. Background technique [0002] We know that hard-sealed ball valves are widely used in various fields such as petroleum, chemical industry, steel, metallurgy and electric power. , the valve seat set between the ball and the bonnet, and the spring set in the bonnet. Compared with other soft material-sealed valves, the hard-sealed trunnion ball valve has the advantages of high temperature resistance and high pressure. However, due to the specific pressure required by the hard-seal trunnion ball valve, the valve switching torque is too large, and the contact between the ball and the valve seat will occur during use. The rapid wear and tear of the surface will cause the leakage of the valve and shorten the service life of the valve. Contents of the invention [0003] In order to overcome the deficiencies of the prior art, the object of the prese...

AI Technical Summary

Problems solved by technology

Compared with other soft material-sealed valves, the hard-sealed trunnion ball valve has the advantages of high temperature resistance and high pressure. However, due to the specific pressure required by the hard-seal trunnion ball valve, the valve switching torque is too large, and the contact between the ball and the valve seat will occur during use. Rapid wear and strain on the surface, resulting in leakage of the valve and shortening the service life of the valve

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