Masoneilan 3" Model 88U-25125 Diaphragm Control Valve | 2" Body | 150 ANSI | SVI-2 Positioner | 100 PSI

What pressure, flow and temperature is it rated for?

This valve is rated 150 ANSI with a 100 PSI pneumatic supply requirement for the positioner. The listing does not specify flow coefficient (Cv), temperature rating, or trim sizing—contact the seller for the valve trim configuration and temperature limits, which depend on the diaphragm material and seat design. Diaphragm control valves in this class typically handle moderate pressures and temperatures but require specific trim data for accurate flow sizing.

What materials are the wetted parts?

The body is constructed of 316 stainless steel. The listing does not specify the diaphragm material, seat material, or stem packing—these are critical for chemical compatibility and should be confirmed with the seller before purchase.

What should I inspect before putting it into service?

Inspect the diaphragm for cracks, stiffness, or degradation, as this is the primary wear item and determines shelf life even on unused stock. Verify the SVI-2 positioner calibrates correctly, check for stem binding or packing leaks during stroking, and confirm the air filter regulator delivers clean, dry air at the correct pressure. Bench test the valve action (configured for air-to-close) across the full stroke to ensure smooth positioning and proper seat shutoff before installation.