Applications and structural features of Gate Valve

The Gate Valve uses a ball with a circular through hole as the opening and closing part. The ball rotates with the Valve Stem to achieve the opening and closing action. The Gate Valve evolved from the Plug Valve, also known as the spherical plug valve. The opening and closing part of the Gate Valve is a sphere, which is used to rotate 90 degrees around the axis of the valve stem to achieve the purpose of opening and closing.

The Gate Valve is mainly used to cut off, distribute and change the flow direction of the medium on the pipeline. The Gate Valve designed with a V-shaped opening also has a good flow regulation function. The Gate Valve only needs to rotate 90 degrees and a very small torque to close tightly. The completely equal inner cavity of the valve body provides a very small resistance and straight flow channel for the medium. The Gate Valve is not only simple in structure and has good sealing performance, but also has a small volume, light weight, low material consumption, small installation size, and small driving torque within a certain nominal diameter range. It is easy to operate, easy to open and close quickly, easy to operate and maintain, and is suitable for general working media such as water, solvents, acids and natural gas, and is also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The Gate Valve body can be integral or combined.

The Gate Valve is a new type of valve that came out in the 1950s. In just over 30 years, it has been one of the fastest-growing valve varieties in the past decade. Especially in industrially developed countries such as the United States, Germany, Japan, France, Italy, Spain, and the United Kingdom, Gate Valve are widely used, and the variety and quantity of use are still expanding, and they are developing towards high temperature, high pressure, large diameter, high sealing, long life, excellent adjustment performance and one valve with multiple functions. Its reliability and other performance indicators have reached a high level, and it has partially replaced Gate Valve, stop valves, and throttle valves. It has been widely used in aerospace, petrochemical, long-distance pipeline, light industry and food, construction and many other fields. This is because Gate Valve have many outstanding advantages compared with other valves. The main features of Gate Valve are as follows:

Gate Valve generally have two structures: reduced diameter and non-reduced diameter channel. Regardless of the structure, the flow resistance coefficient of the Gate Valve is relatively small. In particular, the so-called full-flow type, that is, the non-reduced diameter Gate Valve, because its channel diameter is equal to the inner diameter of the pipeline, the local resistance loss is only the friction resistance of the pipeline of the same length, that is, among all valves, this type of Gate Valve has the smallest flow resistance. In rocket launch and its test system, the smaller the resistance of the transport pipeline, the better. There are two ways to reduce the resistance of the pipeline system: one is to reduce the fluid flow rate, for which it is necessary to increase the pipe diameter and valve diameter, which often has an adverse effect on the economy of the pipeline system, especially for the cryogenic transportation system (liquid hydrogen). It is extremely unfavorable; the other is to reduce the local resistance of the valve, so the Gate Valve naturally becomes the best choice.