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 (Cv) and temperature rating are not provided in the listing; you'll need to request the valve's specific trim configuration and material specifications from the seller to determine those parameters. Masoneilan 88U series valves typically have temperature limits that depend on the diaphragm and seal materials installed.

What materials are the wetted parts?

The body is constructed of 316 stainless steel. The listing does not specify materials for the trim, diaphragm, seats, or seals. You should request detailed material certifications from the seller, particularly for the diaphragm and trim components, as these determine chemical compatibility and service limits.

What should I inspect before putting it into service?

The seller recommends inspection and service before commissioning. At minimum, inspect the diaphragm for cracks or degradation, verify the SVI-2 positioner calibration and response, check the stem packing for leaks, and examine all seating surfaces for erosion or damage. Bench-test the complete assembly to confirm stroke, linearity, and proper air signal response across the operating range before installing in a process line.