Pneumatic gate valve _ Pneumatic knife gate valve

Comparative analysis of pneumatic gate valve and pneumatic knife gate valve:

1、 Core structure and working principle
Pneumatic gate valve
Adopting gate vertical motion control for medium on/off, with a flat or wedge-shaped sealing surface design, suitable for fully open/fully closed working conditions.
Typical structure: visible stem type (valve stem lifting visible) or concealed stem type (valve stem not lifting).
Pneumatic knife gate valve
The gate is in the shape of a blade and is driven up and down by a pneumatic actuator. It has a shearing function and can handle media containing particles.
Typical structure: For clamp or flange connections, the sealing surface is either a soft seal (rubber/PTFE) or a hard seal (metal/ceramic).
2、 Performance comparison
Parameter Pneumatic Gate Valve Pneumatic Knife Gate Valve
Sealing grade ANSI Class IV~VI ANSI Class VI (soft seal)
Applicable pressure PN1.0~PN25 PN1.0~PN16
Applicable temperature -40 ℃~550 ℃ -40 ℃~200 ℃
High flow resistance coefficient (when the gate is fully open) and extremely low (blade shaped flow channel design)
Advantage scenario:
Pneumatic gate valve: High pressure cut-off for cleaning media such as high-pressure steam and oil.
Pneumatic knife gate valve: wear-resistant control for media containing solid particles such as slurry and sewage.
3、 Typical application areas
Petrochemical industry
Pneumatic gate valve: High pressure cut-off of crude oil pipelines (as per API 6A standard).
Pneumatic knife gate valve: control of catalyst particle transportation.
Environmental Protection Engineering
Pneumatic knife gate valve: Sludge discharge from sewage treatment plants (such as PZ673X-10C model).
Metallurgical industry
Pneumatic gate valve: High temperature gas pipeline (such as Z941H-16C hard seal gate valve).

选型建议