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 and has a 6-30 PSI operating range with spring-to-open action. The listing does not specify flow coefficient (Cv) or temperature limits for this unit; request those figures from the seller along with the specific trim configuration, as both are critical for sizing and compatibility with your process conditions.

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

The listing does not state what service this valve was used in or whether it has been oxygen cleaned. Diaphragm control valves in 316 stainless construction are commonly used across a range of gases, but previous service and residual contamination determine what gases it can safely handle without reconditioning. Ask the seller about service history and whether oxygen cleaning or other cleaning protocols have been performed.

What materials are the wetted parts?

The valve is constructed of 316 stainless steel. The listing does not specify trim material, diaphragm material, or seat material—all of which contact process media and matter for compatibility and durability. Request the full materials of construction from the seller, particularly for the diaphragm and seat, as these determine chemical compatibility and service life.

What should I inspect before putting it into service?

The seller recommends inspection and servicing prior to commissioning to ensure proper calibration and performance. At a minimum, verify diaphragm integrity, check for seat leakage and valve stroking response, calibrate the SVI-2 positioner against your control signal, and confirm the air filter regulator output matches your supply pressure requirements. Diaphragm control valves are sensitive to diaphragm fatigue and seat wear after storage, so bench testing the full stroke and leak-off before installation is standard practice.