Masoneilan 3" Model 88U-25125 Diaphragm Control Valve | 1" Body | 300 ANSI | SVI-2 Valve Positioner | Air Filter Regulator

What pressure, flow and temperature is it rated for?

The valve body is rated for 300 ANSI pressure. The listing does not specify flow coefficient (Cv), temperature rating, or operating temperature range—contact the seller for the nameplate data and any available flow curves. Diaphragm control valves in this class typically operate from cryogenic temperatures to several hundred degrees Fahrenheit depending on diaphragm and seat material selection, but you'll need the specific trim configuration to confirm compatibility with your service conditions.

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

The listing does not state previous service history or oxygen cleaning status. Contact the seller to determine what media the valve has handled and whether it has been cleaned for oxygen service. The 316 SS body material is compatible with most industrial gases, but oxygen service requires documented cleaning to CGA G-4.1 or similar standards, and the elastomer materials in the diaphragm and positioner must also be oxygen-compatible.

What materials are the wetted parts?

The body material is 316 SS. The listing does not specify trim materials, diaphragm composition, or seat/plug materials—contact the seller for these details. On Masoneilan 88U series valves, the plug, seat, and internal trim materials vary by service and can include 316 SS, hardened alloys, or elastomer-lined components depending on the application.

What should I inspect before putting it into service?

Inspect the diaphragm for cracks, stiffness, or chemical degradation, and verify the valve plug and seat for scoring, erosion, or deposits that indicate corrosive service. Stroke the valve through its full travel while monitoring positioner response to check for binding, hysteresis, or air leaks in the actuator. Calibrate the SVI-2 positioner to your control signal and verify air supply quality meets instrument air standards, then perform a seat leakage test to confirm shutoff meets your process requirements.