Cut-off valve structure for fast opening or closing

Abstract

A cut-off valve structure operated fastly is composed of valve core and valve seat. The part of valve core opposite to the valve seat appears as almost conic shape, on which there is a lining sleeve.The said lining sleeve has concave surfaces and on the opposite surface of valve seat there are convex surfaces. They are matched for sealing. Its advantages are high flow and good sealing. Lifting up valve core by a small distance can fully open the valve.

Description

technical field [0001] The invention relates to a shut-off valve, in particular to a fast-switching shut-off valve structure. Background technique [0002] In the past, most of the faucets used in daily life were rotary lifting type, but now, there is a tendency to be gradually replaced by ceramic spool valves. One of the important reasons is that ceramic spool valves can be switched from closed to closed only by rotating the handle 90°. The maximum open state is very convenient to use, but the rotary lift faucet needs to rotate the handle several times to switch from the closed state to the maximum open state. The difference is mainly caused by the different spool structures of the two. Design, when the handle of the rotary lifting faucet is rotated 90°, the water output is quite small and cannot be used normally; another reason is that the valve core and the valve seat of the traditional rotary lifting faucet are sealed by a flat gasket Yes, the gasket is made of rubber, ...

AI Technical Summary

Problems solved by technology

[0002] In the past, most of the faucets used in daily life were rotary lifting type, but now, there is a tendency to be gradually replaced by ceramic spool valves. One of the important reasons is that ceramic spool valves can be switched from closed to closed only by rotating the handle 90°. The maximum open state is very convenient to use, but the rotary lift faucet needs to rotate the handle several times to switch from the closed state to the maximum open state. The difference is mainly caused by the different spool structures of the two. Design, when the handle of the rotary lifting faucet is rotated 90°, the water output is quite small and cannot be used normally; another reason is that the valve core and the valve seat of the traditional rotary lifting faucet are sealed by a flat gasket Yes, the gasket is made of rubber, so it is easy to leak due to aging and wear. Therefore, even if the factory design is a 90° rotary switch, when the gasket is worn, it is switched from the closed state to the maximum open state. The rotation of the handle The angle will be much greater than 90°

[0003] 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.

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