Introduction to the classification of gate valves and analysis of their advantages
Release date:
2019-02-19
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Abstract
The gate valve uses the gate plate as the opening and closing member. The valve stem is raised and lowered to drive the gate plate up and down to achieve the opening and closing of the valve. The direction of movement of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed, not adjusted and throttled.It can be applied to water, steam, oil, nitric acid, acetic acid, oxidizing media, urea and other media respectively.
This imported gate valve market is divided into imported cast steel gate valves, imported cast iron gate valves, and imported stainless steel gate valves by material.；
According to flange standards, it can be divided into imported American standard gate valves and imported Japanese standard gate valves.；
According to the connection method, it can be divided into imported internal thread forged steel gate valve and imported high temperature and high pressure power station gate valve (welded gate valve)；
It can also be divided according to the structure of the valve plate. There are imported knife-shaped gate valves and imported pneumatic slurry valves for slurry, coal washing, and mine pulp, and imported flat gate valves for oil drilling, etc.；
The special gate valve market also uses imported elastic seat-sealed gate valves for water, imported low-temperature gate valves for low-temperature liquid natural gas and low-temperature liquid oxygen, and imported jacket thermal insulation gate valves with thermal insulation and cold preservation such as asphalt and thermal oil.
Advantages of Chinese gate valves
1. The flow resistance is small.The internal media channel of the valve body of the gate valve imported from China is straight, the media flows in a straight line, and the flow resistance is small.
2. The opening and closing of the gate valve is more labor-saving.Because whether it is open or closed, the direction of movement of the gate is perpendicular to the direction of medium flow.
3. The height of the gate valve is large and the opening and closing time is long.The opening and closing stroke of the gate is large, and the descent is carried out through the screw.
4. The closing time of the gate valve is long, and it is not easy to produce water hammer phenomenon.
5. The channel of the gate valve is symmetrical on both sides, and the medium can flow in any direction on both sides, which is easy to install and is not limited by the direction.
China's gate valves will be more widely used in water conservancy, machinery, papermaking, metallurgy, petrochemical, chemical industry, urban construction and other industries.
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