Fisher Size 30 Spring-Opposed Diaphragm Actuator | 3/4" Travel | 3–15 PSI Range

What pressure, flow and temperature is it rated for?

This actuator operates on 3–15 PSI supply pressure and provides 3/4-inch travel. The listing does not specify output thrust, temperature limits, or flow characteristics—ask the seller for the actuator's thrust rating, operating temperature range, and whether the original datasheet or nameplate information is available.

What gases is it compatible with, and has it been oxygen cleaned?

The listing indicates compatibility with air, water, and other process fluids but does not specify whether it has been oxygen cleaned or used in oxygen service. Spring-opposed diaphragm actuators are pneumatically operated devices that position control valves and do not directly contact process media. Ask the seller about the previous service application and whether oxygen cleaning documentation exists if you need it for O₂ or oxidizer service.

What should I inspect before putting it into service?

The seller states this unit requires re-certification before use to ensure proper calibration and safe operation. Inspect the diaphragm for cracks, tears, or stiffening; check the spring for corrosion or set; verify the stem and travel stops move freely through the full 3/4-inch stroke; and bench-test the actuator at 3–15 PSI to confirm it strokes smoothly and holds position without drift, then calibrate to match your valve's required bench set.