Masoneilan 3" Model 88U-25125 Diaphragm Control Valve | 1" Body | 150 ANSI | SVI-2 Valve Positioner | Air Filter Regulator

What pressure, flow and temperature is it rated for?

The valve body is rated for 150 ANSI pressure class. Flow capacity and temperature limits are not provided in the listing — you'll need to request the Cv rating, trim configuration, and material temperature ratings from the seller to determine suitability for your process conditions. Diaphragm control valves in this class typically handle temperatures up to 450°F depending on body and diaphragm materials, but confirm specifics for this unit.

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

Gas compatibility depends on the trim materials, diaphragm compound, and previous service history, none of which are specified in the listing. There is no indication that this unit has been oxygen cleaned or prepared for oxygen service. For oxygen or other specialty gas applications, ask the seller about service history and whether oxygen cleaning to CGA G-4.1 standards can be performed, as any prior hydrocarbon or contaminating service would require extensive cleaning and verification.

What materials are the wetted parts?

The valve body is 316 stainless steel. The listing does not specify trim materials, seat material, or diaphragm compound — request this information from the seller along with the trim style and seat configuration to verify chemical compatibility with your process media.

What should I inspect before putting it into service?

The seller explicitly states this unit must be re-serviced before use. At minimum, inspect the diaphragm for cracks or stiffening, verify stem packing integrity, check trim and seat for erosion or damage, and confirm the SVI-2 positioner calibration and zero/span settings. Stroke the valve through its full travel while monitoring actuator air pressure to identify binding, hysteresis, or dead band issues, and perform a seat leakage test to verify shutoff capability meets your process requirements.