Masoneilan 3" Model 88U-25125 Diaphragm Control Valve | 2" Body | 150 ANSI | SVI-2 Valve Positioner | Air Filter Regulator

What pressure, flow and temperature is it rated for?

This valve is rated for 150 ANSI pressure class. The listing does not specify flow coefficient (Cv) or temperature limits—ask the seller for the nameplate data or original datasheet, as these parameters are critical for proper sizing. Diaphragm control valves in this class typically have temperature limits dependent on the diaphragm material, commonly ranging from -20°F to 450°F for PTFE-lined units.

What materials are the wetted parts?

The valve body is 316 SS construction. The listing does not specify trim materials, diaphragm composition, or seat material—these are critical for corrosion resistance and service compatibility, so request a detailed material list or the original material specification sheet from the seller.

What should I inspect before putting it into service?

The seller states this unit must be re-serviced before use for proper calibration and safe operation. At minimum, inspect the diaphragm for cracks or hardening, verify stem travel and packing integrity, bench-test the SVI-2 positioner calibration and response, check the air filter regulator for contamination, and confirm all wetted components are compatible with your intended service. Flow-test the valve if possible to verify the seat is not eroded and stroking is smooth across the full range.