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 has a 150 ANSI pressure rating with a 1-inch body size. Flow capacity and temperature limits are not provided in the listing—ask the seller for the valve's Cv coefficient, trim style, and material temperature range, which are typically documented on Masoneilan's specification sheets for the 88U series. Control valve flow capacity is determined by the combination of body size, trim design, and differential pressure across the valve.

What materials are the wetted parts?

The body is 316 stainless steel. The listing does not specify the trim material, diaphragm type, or seat material—these should be confirmed with the seller as they determine chemical compatibility and service life. On Masoneilan 88U valves, the plug, seat, stem packing, and diaphragm all contact process media and are available in various material combinations depending on the original service specification.

What should I inspect before putting it into service?

The listing explicitly states this unit must be re-serviced before use to ensure proper calibration and operation. At minimum, inspect the diaphragm for cracks or hardening, verify stem travel and packing tightness, check the seat for erosion or damage, and confirm the SVI-2 positioner calibrates correctly to the input signal. Bench test the assembly at your operating pressure and signal range to verify stroking, seat shutoff, and positioner response before installation.