Corrugated pipe track ball valve

Abstract

A corrugated pipe track ball valve comprises a valve rod, a valve cover, a valve seat and a ball body, a corrugated pipe is arranged between the valve rod and the valve cover, a valve cover nut is arranged on the outer side of the corrugated pipe, the valve cover nut is matched with the valve cover through a thread pair, a positioning shoulder welded to the corrugated pipe is arranged on the lower portion of the valve rod, and a guide pin is arranged on the valve cover. The valve rod is provided with a guide rail groove matched with the guide pin, the guide rail groove is linear, the upper portion of the ball body is provided with a 90-degree spiral groove hole, the lower end of the valve rod is provided with a 90-degree spiral guide rail matched with the 90-degree spiral groove hole, the central axis of the 90-degree spiral guide rail and the axis of the valve rod are provided with eccentricity, and the upper end face of the ball body is provided with an annular groove. And a thrust collar is embedded in the annular groove. The corrugated pipe track ball valve has the beneficial effects that many defects of a general ball valve are overcome through a simple and effective movement mode, no friction exists in the opening and closing process, zero leakage is achieved during closing, no friction exists between the ball body and the valve seat during opening and closing, and the opening and closing torque of the valve is reduced.

Description

technical field [0001] The invention relates to a ball valve, in particular to a bellows track ball valve. Background technique [0002] Orbital ball valves are widely used in isomerization units because of their excellent sealing performance. Orbital ball valve stem and the outside world are only sealed with packing. In the isomerization device with harsh working environment, there is a risk of medium leakage due to packing wear and tear when the valve is switched on and off many times. At the same time, the ordinary track ball valve realizes the lifting and rotation of the valve stem through the cooperation of the S-shaped spiral guide groove on the valve stem and the guide pin on the bracket. It is necessary not only to overcome the axial force of the valve stem torque, but also to realize the lifting function of the valve stem. After the valve is opened and closed many times, the corners of the S-shaped spiral guide rail are easily squeezed and deformed by the guide pin...

AI Technical Summary

Problems solved by technology

Ordinary orbital ball valve stem and the outside world are only sealed with packing. In the isomerization device with harsh working environment, there is a risk of medium leakage due to packing wear and failure when the valve is switched on and off many times.

At the same time, the ordinary track ball valve realizes the lifting and rotation of the valve stem through the cooperation of the S-shaped spiral guide groove on the valve stem and the guide pin on the bracket. It is necessary not only to overcome the axial force of the valve stem torque, but also to realize the lifting function of the valve stem. After the valve is opened and closed many times, the corners of the S-shaped spiral guide rail are easily squeezed and deformed by the guide pin, resulting in the torque transmission of the valve handwheel. After reaching the sphere, the sealing surface between the sphere and the valve seat is not tight, and there is a possibility of internal leakage of the medium

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