Soft seal gate valve

Abstract

The invention relates to a soft seal gate valve, which comprises a valve body, a gate disc vertically moving along gate disc slideways at the two sides in the valve body and a valve rod which operates the gate disc to vertically move to start and stop; the two sides of the gate disc are provided with gate disc sliding grooves sliding on the gate disc slideways; the contact parts between the gate disc sliding grooves and the gate disc slideways are provided with pressure protection grooves used for relieving liquid pressure; the gate disc is formed by coating a layer of rubber material on the outer surface of a casting substrate; the inner wall and the outer surface of the valve body are sprayed with a non-toxic odourless resin (RAL7040) powder coating layer; and three plane seals are adopted between the lower part of the gate disc and a runner of the valve body for contact. In the soft seal gate valve, a layer of rubber is used for coating the gate disc and the inner wall of the valve body is sprayed with the non-toxic resin powder coating layer to thoroughly prevent the contact of liquid and metal and secondary pollution. The valve has the characteristics of high temperature resistance, high pressure resistance, corrosion resistance and high tensile strength, is safer in application and flexibility in starting. Moreover, water flow can be completely cut off by the three seals to ensure the service life of the valve.

Description

technical field [0001] The invention relates to a valve, in particular to a soft-sealed gate valve. Background technique [0002] Gate valves are widely used in water supply and drainage pipelines. As one of the valves for regulating and throttling, the purpose of opening or closing is achieved through the lifting and lowering of the gate. The valve body, the gate and the sealing part of the gate of the existing gate valve all need to be machined. In direct contact with the conveying medium, it is very easy to rust during use. Even if the surface is painted to block the contact between the liquid and the metal, some of them will fall off the paint surface before leaving the factory, rust and corrode, and pollute the conveying medium. On the tap water pipeline, it causes secondary pollution to the tap water. Since the lower part of the gate plate and the flow channel of the valve body are often sealed with the gate plate and the gate groove, it will not only increase the re...

AI Technical Summary

Problems solved by technology

In direct contact with the conveying medium, it is very easy to rust during use. Even if the surface is painted to block the contact between the liquid and the metal, some of them will fall off the paint surface before leaving the factory, rust and corrode, and pollute the conveying medium. On the tap water pipeline, causing secondary pollution to the tap water

Since the lower part of the gate plate and the flow channel of the valve body are often sealed with the gate plate and the gate groove, it will not only increase the resistance of the liquid flow and the pressure, but also easily generate debris accumulation in the gate groove, which will affect the closing of the gate and cause poor sealing. Strict, poor operation, large opening torque

The valve is made of ordinary gray cast iron with low tensile strength. After being installed on the pipeline, it cannot withstand the stretching of the pipeline, and it is easy to burst, resulting in water supply failure.

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