Introduction of working principle and advantages of knife gate valve

Knife gate valve is a kind of valve that cuts off or circulates the medium through the lifting movement of the valve core. Its working principle is as follows:

Open state: when the valve core is in the top position, the medium can circulate through the gap between the valve seat and the valve body on both sides of the valve core to realize the open state of the valve.

Closed state: When the valve core is in the bottom position, the valve core will rise and closely contact with the valve seat, thus cutting off the circulation of the medium and realizing the closed state of the valve.

The advantages of knife gate valve are as follows:

Quick cut-off ability: Because the knife gate valve adopts the vane valve core, it can quickly cut off the circulation of the medium during the lifting process, which has the quick cut-off ability and is suitable for occasions with large medium flow and high pressure.

Excellent hard sealing performance: Knife gate valve adopts metal-to-metal sealing, metal-to-rubber sealing, metal-to-PTFE sealing and other hard sealing methods, which has excellent sealing performance and can effectively prevent medium leakage and ensure system safety.

High temperature resistance and corrosion resistance: Knife gate valves are usually made of materials with high temperature resistance and corrosion resistance, such as stainless steel and alloy steel, which can run stably in high temperature and corrosive media for a long time.

Simple structure and convenient maintenance: the knife gate valve has relatively simple structure, few parts and convenient maintenance. The wear between the valve core and the valve seat is small and the service life is long.

Wide scope of application: Knife gate valves are suitable for occasions with high media velocity and high pressure, and are widely used in petroleum, chemical industry, natural gas, electric power, metallurgy and other industrial fields.

It should be noted that the vertical speed of the spool should be paid attention to when the knife gate valve is running, so as to avoid the spool bumping or impact load caused by the excessive vertical speed, thus affecting the service life of the valve. At the same time, in the selection and installation, the material, sealing method and size of knife gate valve should be reasonably selected according to the specific working conditions and media characteristics to ensure the performance and reliability of the valve.

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