Internal-pressure self-control ball valve

Abstract

The invention discloses an internal-pressure self-control ball valve which comprises a valve rod, a middle valve body, side valve bodies, a ball, an elastic valve seat, supporting plates, an energy storage pressing plate and a valve seat pushing-out mechanism. The side valve bodies are provided with circulating channels for the medium pressure to pass through, an energy storage cavity is formed by the energy storage pressing plate, the valve seat and the side valve bodies, and the valve seat pushing-out mechanism comprises a cam disc, a guide rod, plunger reversing valves, reset springs and the like; when the valve rod rotates to drive the cam disc and the guide rods, and plungers are ejected to be open through the guide rods, the upstream medium pressure enters the energy storage cavity through the plunger reversing valves, the pressure of the energy storage cavity is increased to push the valve seat to be separated from the ball, and the torque for opening the valve is reduced; when the ball valve is completely opened, the cam disc and the guide rods are located at the lowest points, the reset springs push the plungers to be reset, the medium pressure of the energy storage cavity is released through the plunger reversing valves, and a valve seat spring pushes the valve seat to seal the ball. According to the internal-pressure self-control ball valve, the torque for opening the valve is reduced, energy is saved, abrasions to the valve seat and the valve bodies are reduced, sealing is reliable, and the service life is long.

Description

technical field [0001] The invention belongs to the technical field of ball valves, in particular to an internal pressure self-control ball valve. Background technique [0002] Ball valve is a kind of valve with sphere as the opening and closing part. Because of its small flow resistance, fast opening and closing speed, simple and convenient operation, it is widely used in the installation and use of metallurgy, petroleum, chemical and natural gas transmission pipelines. The sealing of the ball valve is formed by the preset compression ratio pressure between the ball and the valve seat. The general ball valve forms a pre-compression ratio pressure through the elastic element between the valve body and the valve seat. During the opening and closing process of the ball valve, the pre-tightening force always acts on the sealing pair. The large opening and closing torque also accelerates the wear of the seal. Affected the service life of the ball valve. Contents of the invent...

AI Technical Summary

Problems solved by technology

The general ball valve forms a pre-compression ratio pressure through the elastic element between the valve body and the valve seat. During the opening and closing process of the ball valve, the pre-tightening force always acts on the sealing pair. The large opening and closing torque also accelerates the wear of the seal. Affected the service life of the ball valve

Images