Masoneilan 3" Model 88U-25125 Diaphragm Control Valve | 1" Body | 300 ANSI | SVI-2 Positioner | 100 PSI

What pressure, flow and temperature is it rated for?

This valve is rated for 300 ANSI pressure class. Flow capacity and temperature rating are not specified in the listing—ask the seller for the Cv coefficient and trim material to determine flow capability and temperature limits for your service conditions.

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

The 316 SS body construction is generally compatible with most industrial gases, but specific compatibility depends on the elastomer materials in the diaphragm and positioner seals, which are not specified. There is no indication this unit has been oxygen cleaned or is oxygen service rated—confirm with the seller if you require oxygen service, as special cleaning and compatible elastomers are required.

What materials are the wetted parts?

The valve body is 316 stainless steel. The listing does not specify the diaphragm material, seat material, or stem material—ask the seller for the complete bill of materials to verify compatibility with your process fluid.

What should I inspect before putting it into service?

The seller notes the unit must be re-serviced before use. Inspect the diaphragm for cracks, tears, or permeation damage, verify the seat for wear or erosion, and check the stem packing. Bench test the SVI-2 positioner for calibration, hysteresis, and dead band, and confirm the air filter regulator element is clean and the regulator holds setpoint—typical diaphragm control valve reassembly includes new soft parts and full stroke testing across the 4-20 mA range.