Forced sealing ball valve

Abstract

The invention discloses a ball valve, and particularly relates to a forced sealing ball valve. The forced sealing ball valve comprises a valve body, an auxiliary valve body, a ball body, a valve seat and an auxiliary valve body fluid pipeline. A stud-nut driving type forced sealing device is arranged on the outer circle of the auxiliary valve body fluid pipeline, wherein a worm wheel and a driving stud are connected through a flat key. When the driving stud rotates, an axial sliding key groove of a driven nut screwed with the driving stud is made to conduct axial linear motion along a guiding key on the auxiliary valve body fluid pipeline, so that the needed sealing specific pressure is produced between the valve seat and the ball body in a valve cavity through the pressure produced outside via the pressure transferring. Thus, low-torque opening and closing and forced sealing are achieved. Related motion processes of the stud-nut driving type forced sealing device and an electric actuator are achieved through an automatic control system in the opening and closing process and the sealing process. According to the structure of the forced sealing ball valve, the selected corresponding materials can be suitable for various severe fluid and environments.

Description

technical field [0001] The invention relates to a valve, in particular to a forced sealing ball valve. Background technique [0002] A ball valve is a valve with a sphere as a closing member. It has the advantages of small flow resistance, no damage to the shape of the fluid, and convenient switching. However, the wear between the sphere and the valve seat during switching is also a major problem It seriously affects the service life of valves, and researchers in the valve industry have also done a lot of work for this, such as a "low torque non-wearing fixed ball valve" disclosed in Chinese invention patent CN201310323798. There is also a significant improvement in performance, specifically manifested in the rotation of the ball valve when the ball valve is opened and closed. The ball completes the 90° rotation action relative to the valve seat under the condition of small specific pressure, so it is called "low torque non-wear fixed ball valve". , but the fly in the ointm...

AI Technical Summary

Problems solved by technology

[0002] A ball valve is a valve with a sphere as a closing member. It has the advantages of small flow resistance, no damage to the shape of the fluid, and convenient switching. However, the wear between the sphere and the valve seat during switching is also a major problem It seriously affects the service life of valves, and researchers in the valve industry have also done a lot of work for this, such as a "low torque non-wearing fixed ball valve" disclosed in Chinese invention patent CN201310323798. There is also a significant improvement in performance, specifically manifested in the rotation of the ball valve when the ball valve is opened and closed. The ball completes the 90° rotation action relative to the valve seat under the condition of small specific pressure, so it is called "low torque non-wear fixed ball valve". , but the fly in the ointment is: the sealing specific pressure between the valve seat and the ball is realized by converting the hydraulic energy of the hydraulic system into mechanical energy, so there are many leakage control points, especially the micro-leakage control is difficult. When used under high-pressure conditions, a lot of cumbersome devices need to be added to ensure the working performance of the hydraulic system within the allowable temperature range, and the manufacturing cost is relatively high

Images