Pneumatic Actuated Gate Valve

Pneumatic gate valve is an automatic control valve powered by compressed air, which is widely used in industrial pipeline systems.
1. Definition and working principle
Pneumatic gate valve drives the actuator through compressed air, driving the valve stem to realize the vertical lifting and lowering movement of the gate. Its core working principle is:

The piston in the cylinder generates thrust under the pressure of the air source, pushing the transmission rod to drive the gate to move;
When using a double-layer cylinder structure, the upper and lower pistons work together to increase the opening and closing force, solving the problem of easy jamming of a single cylinder;
Some models are equipped with a buffer mechanism, which can effectively reduce the wear of the sealing surface caused by the closing impact.
2. Typical structural features
‌Main body composition‌

Valve body: Common materials include ductile iron, cast steel, stainless steel (such as 316L)
Valve stem: Stainless steel (such as 2Cr13), large-diameter valves use stainless steel embedded structure
Sealing surface: divided into self-sealing (relying on medium pressure) and forced sealing (requiring external force to pressurize)
‌Actuator‌

Single-acting type: Spring reset structure, can automatically open/close when air is cut off
Double-acting type: requires two-position five-way solenoid valve control, air-open and air-close bidirectional operation
Manual switching mechanism: used for emergency operation when pneumatic failure

 

pneumatic actuated gate valve

 

Operation specification
‌Opening process‌

Check that the gas source pressure is stable at 4-6MPa and confirm that there is no leakage in the pipeline
Remote control requires verification of signal transmission. After switching to manual mode on-site operation, rotate the valve stem clockwise
Monitor the change in opening degree and stop immediately when encountering resistance
‌Closing points‌

Double-acting valve switches the gas path direction through the solenoid valve
Rotate the valve stem counterclockwise to the fully closed position, and pay attention to the buffer mechanism to reduce the impact
V. Application field
‌Industry‌: petrochemical, electric power, environmental protection, water conservancy, machinery manufacturing
‌Medium‌: water, steam , oil, corrosive liquids, etc.
‌Working conditions‌: working pressure ≤6.4MPa, temperature range -20℃~550℃ (special models can reach higher)

Selection considerations
Nominal pressure must be ≥ pipeline working pressure, and it should withstand 1.1 times the working pressure without leakage in the closed state
Knife-type gate valves are preferred for medium containing particles, and chromium-molybdenum steel materials must be used for high temperature conditions
Enterprise standard products must be accompanied by technical documents in the contract
Special models such as PZ643 and Z641H series are particularly suitable for easy jamming conditions due to the double-layer cylinder design. Regular sealing tests are required during long-term storage to prevent performance degradation caused by aging of the rubber lining.

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