Anti-leakage durable structure of cut-off valve

Abstract

An antileakage high-durability cut-off valve is composed of metallic valve core and valve seat. A solid lubricating material layer is solidified on the sealing surface for one of them. The interface of said lubricating layer upon the valve seat or valve core is a rough plane formed by grooves or holes. The friction between said solid lubricating material layer and valve seat or valve core can transfer the molecular of lubricating material to the metallic surface of valve seat or valve core, improving the anti-leakage performance and durability.

Description

technical field [0001] The invention relates to a stop valve structure, in particular to a leakage-proof and durable stop valve structure. Background technique [0002] In the past, most of the faucets used in daily life were rotary lift stop valves, but now, there is a tendency to gradually replace them with ceramic spool valves. The reason is that the traditional rotary lift faucet has a flat seal between the valve core and the valve seat The sealing pad is made of rubber, so it is easy to leak due to aging and wear, and the service life is short; and the ceramic valve core is widely welcomed because of its small friction, not only wear resistance, but also labor-saving opening and closing. However, the ceramic spool faucet also has its inherent disadvantages: First, the ceramic spool is brittle and fragile. If it is accidentally collided during production, manufacturing, transportation, and installation, the ceramic spool may be broken; In rural areas, anti-freeze and he...

AI Technical Summary

Problems solved by technology

[0002] In the past, most of the faucets used in daily life were rotary lift stop valves, but now, there is a tendency to gradually replace them with ceramic spool valves. The reason is that the traditional rotary lift faucet has a flat seal between the valve core and the valve seat The sealing pad is made of rubber, so it is easy to leak due to aging and wear, and the service life is short; because of the small friction, the ceramic valve core is not only wear-resistant, but also saves effort in switching, so it is widely welcomed by people.

However, the ceramic spool faucet also has its inherent disadvantages: First, the ceramic spool is brittle and fragile. If it is accidentally collided during production, manufacturing, transportation, and installation, the ceramic spool may be broken; In rural areas, anti-freeze and heat preservation measures are not in place in winter. The water in the faucet freezes into ice and the ceramic valve core will be crushed; in areas with poor tap water quality, the tap water will be mixed with hard impurities such as rust residue and sand. In the process, once these hard impurities are stuck between the two ceramic valve chips, the ceramic valve core will also be broken. Even in areas with better water quality, because water plants generally use sand filtration technology, some sand will always be brought out by the water. In addition, a certain amount of rust residue will also fall off the inner wall of the water pipe, which may also cause the ceramic valve core to break when switching; second, the seal between the ceramic valve core and the two valve pieces is determined by the specific pressure between the two. It works, and this specific pressure is generated by tightening the valve cover and compressing the PUR polyurethane plastic elastic gasket in contact with the valve core during the manufacture and assembly of the faucet. At this time, the specific pressure is the maximum value. The specific pressure will only decrease, not increase; if the specific pressure is too low during manufacture and assembly, or the elasticity of the gasket decreases after use, the specific pressure will decrease, which will lead to leakage; The manufacturing process requirements are relatively high, and the manufacturing cost is also relatively high. It is quite difficult for each valve factory to change production.

Images