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?

This valve is rated for 150 ANSI pressure with a 1" body size. Flow capacity and temperature ratings are not provided in the listing—contact the seller for the valve's Cv rating, seat leakage class, and the specific trim materials that determine temperature limits. Diaphragm control valves in this class typically handle moderate flow rates and temperatures up to 400°F depending on elastomer selection, but you'll need the actual trim configuration to verify.

What materials are the wetted parts?

The body is constructed in 316 SS. The listing does not specify the trim materials (plug, seat, stem) or the diaphragm material, both of which are wetted components critical for compatibility—request this information from the seller along with any elastomer specifications.

What should I inspect before putting it into service?

The seller recommends inspection and re-servicing before installation. Focus on the diaphragm for cracks, hardening, or deformation; the valve seat and plug for erosion or scoring; and the stem packing for leakage. The SVI-2 positioner should be bench-tested for linearity and calibration, and the actuator should be stroke-tested across the full range to verify spring integrity and response—diaphragm actuators commonly develop air leaks at the casing seal after extended storage.