Diaphragm Of Actuator

The Actuator Diaphragm is the core power conversion component of the pneumatic diaphragm actuator. Its core function is to convert the input compressed air pressure into mechanical displacement, thereby driving the terminal control components such as valves and baffles to act, and ultimately achieving precise regulation of the flow rate, pressure or liquid level of the fluid (liquid, gas, steam). It is a key link connecting "control signals" and "mechanical actions" in the field of process control (such as petrochemicals, power, and water treatment).

The performance of the actuator diaphragm directly affects the reliability of the entire control loop. Core indicators include:

Pressure resistance strength: It must withstand the maximum working pressure of the actuator's air chamber (usually ≥1.2MPa, and up to 3MPa for special models), without cracking or permanent deformation.

Fatigue resistance: Under the "pressure loading - unloading" cycle (simulating actual working conditions), it is required to meet no cracks or leaks for ≥ 100,000 cycles (high-end diaphragms can reach over 500,000 cycles).

Sealing performance: The contact surface between the diaphragm and the air chamber must ensure "zero leakage", and the leakage rate is usually required to be ≤1×10⁻⁶ Pa · m³/s (to avoid pressure loss causing a decrease in control accuracy).

Linear deformation: The displacement of the diaphragm must maintain a linear relationship with the input air pressure (linearity error ≤±3%); otherwise, it will lead to a mismatch between the valve opening and the control signal, affecting the accuracy of flow regulation.

Temperature stability: Under extreme temperatures (such as low temperature -50 ℃ and high temperature 200℃), the elastic modulus changes little, avoiding displacement offset caused by temperature (accuracy error ≤±5%).

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