Plastic valve high in reliability and sealing performance

Abstract

The invention discloses a plastic valve high in reliability and sealing performance. The plastic valve comprises a valve shell, a metal ball and a pull rod. A ball guide rail is arranged in the valveshell, and the inner end of the pull rod and the metal ball in the ball guide rail are connected into a whole. The valve shell comprises a main valve shell and an auxiliary valve shell which are detachably connected into a whole. One end of the auxiliary valve shell stretches into the ball guide rail and extrudes the metal ball for control over the opening twisting force of the valve. Visibly, thevalve shell is set to be of a split structure in which the main valve shell and the auxiliary valve shell are detachably connected into a whole, the opening pressure of the valve is adjusted by adjusting the pre-tightening force between the auxiliary valve shell and the metal ball, the opening pressure is controllable, the requirement of the control system is met, and the plastic valve can be well applicable to various control systems. Meanwhile, to achieve fine adjustment of the pre-tightening force, the main valve shell and the auxiliary valve shell are in threaded connection into a whole,and the auxiliary valve shell stretches into the main valve shell and extrudes the metal ball.

Description

technical field [0001] The invention relates to a valve, in particular to a plastic valve with reliable sealing performance. Background technique [0002] As the proportion of plastic pipelines in cold and hot water supply and industrial pipeline engineering applications continues to increase, the quality control of plastic valves in plastic pipeline systems is becoming more and more important. [0003] Because plastic valves have the advantages of light weight, corrosion resistance, no scale absorption, integrated connection with plastic pipelines and long service life, plastic valves are widely used in plastic pipelines for water supply (especially hot water and heating) and other industrial fluids. In the system, its advantages in application are unmatched by other valves. At present, in the production and application of domestic plastic valves, because there is no reliable method to control them, the quality of plastic valve products for water supply and other industria...

AI Technical Summary

Problems solved by technology

At present, in the production and application of domestic plastic valves, because there is no reliable method to control them, the quality of plastic valve products for water supply and other industrial fluids is uneven, and the opening torque of the valve is particularly difficult to control.

[0004] There is a reliable sealing plastic valve in the market, which adopts integral in-mold injection molding. There is a large difference in the opening torque of the valve rod between the same batch or different batches, which is difficult to meet the needs of the control system. Therefore, its It can only be applied to manual valves, but with the development of society, in the low-power intelligent valve control market, the demand for a reliable plastic valve with strong sealing performance and controllable torque of the tie rod is increasingly strong, while the existing one-piece valve cannot meet this need