Structure and Performance of Gate Valves

secureluokai July 8, 2025

Gate valves are widely used valves in pipelines, primarily functioning to connect or shut off media. They are suitable for scenarios with a relatively wide range of pressure, temperature, and caliber, and their applicable scope in these aspects is broader compared to other valves.
In terms of internal structure, gate valves can be divided into various types such as wedge-type single gate, flexible gate, double gate, and parallel gate. Meanwhile, based on the difference in valve stem supports, they can also be classified into rising stem gate valves and non-rising stem gate valves.
Valve Body Manufacturing and Flow Channel Design
The manufacturing methods of gate valve bodies include casting, forging, etc. Their flow channels are divided into full-bore and reduced-bore types, and different flow channel designs will affect the flow resistance and energy consumption of the valve. Among them, the bore diameter of the full-bore flow channel is basically consistent with the nominal diameter of the valve, while the flow bore diameter of the reduced-bore type is smaller than the nominal diameter.
Impact of Reduced-Bore Flow Channels
The advantage of reduced-bore flow channels is that they can reduce the size of the gate, as well as the opening and closing force and torque. However, at the same time, they will increase the flow resistance, leading to higher pressure drop and energy consumption. Therefore, the selection of the size of the reduced bore needs to be appropriate. For conical tube-type reduced bores, the ratio of the seat inner diameter to the nominal diameter is usually between 0.8 and 0.95.
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