A Forced Double Shutoff Frictionless Top Entry Ball Valve

Abstract

The invention discloses a forced double-off frictionless top-loading ball valve, comprising a valve body, a valve cover, a front valve seat, a rear valve seat and a valve stem. The end of the valve stem away from the ball is provided with a driving device, and the driving device can drive the valve The rod rotates circumferentially or slides axially relative to the valve rod; a vacuum oil chamber and a receding area are set between the front valve seat, the rear valve seat and the valve body; when the driving device moves axially toward the valve rod When sliding, the hydraulic oil fills the vacuum oil chambers of the front valve seat and the rear valve seat. At this time, the front valve seat and the rear valve seat are respectively abutted and sealed with the ball; when the driving device slides axially away from the valve stem , the hydraulic oil is pumped out of the vacuum oil chamber, and under the pressure of the medium, the front valve seat and the rear valve seat move toward the abdication area, so that there is a gap between them and the ball. The invention has the following advantages and effects: the ball valve utilizes a sealing oil circuit system to achieve frictionless sealing between the ball and the valve seat.

Description

technical field [0001] The invention relates to a ball valve, in particular to a forced double-block non-friction top-loading ball valve. Background technique [0002] The ball valve is a valve that is driven by the valve stem through the opening and closing part (ball) and rotates around the axis of the ball valve. The top entry ball valve in the ball valve category is widely used in oil and gas pipelines, and in oil extraction, oil refining, petrochemical, chemical, chemical fiber, metallurgy, electric power, nuclear power, food and paper making and other devices. The top entry ball valve is easy and quick to disassemble on the pipeline, and the maintenance is convenient and fast. When the valve fails on the pipeline and needs to be repaired, it is not necessary to disassemble the valve from the pipeline, only the bolts and nuts of the middle flange are removed, the valve cover and stem assembly are removed from the valve body, and then the ball and valve are taken out. ...

AI Technical Summary

Problems solved by technology

[0003] However, the existing top entry ball valve still has friction between the ball and the valve seat during the opening and closing process. With the increase in the number of valve switches, the sealing surface is gradually worn, reducing the sealing performance and product service life, so it needs to be improved.

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