Kimray 4" Pneumatic Control Valve – Class 150 RF | Cast Ductile Body | Linear Trim | Fail-Closed

What pressure, flow and temperature is it rated for?

This valve is rated for 250 PSIG maximum working pressure with a flow coefficient (Cv) ranging from 18.9 minimum to 70.1 maximum and a Cf of 0.79. No temperature rating is provided in the listing—ask the seller for the temperature range qualification and whether elastomers or trim materials impose limits beyond the body rating. The 150 RF flanged connections are consistent with the stated 250 PSIG service pressure.

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

The listing states it is suitable for liquid and gas service and notes that NACE MR0175 compliance is available as an option for sour gas or corrosive environments, but does not specify which gases have been qualified or whether this particular unit includes that option. No oxygen cleaning or oxygen service certification is mentioned—if you need it for O₂ service, confirm with the seller whether it has been cleaned to CGA G-4.4 or equivalent and whether materials are oxygen-compatible. Control valves for oxygen typically require non-sparking trim, specific lubricants, and documented cleaning procedures.

What materials are the wetted parts?

The body is cast ductile iron, and the valve has a 3-inch linear trim, but the listing does not specify the trim material, seat material, or seal/packing composition. Ask the seller for a complete wetted parts list including trim metallurgy, seat ring material, and elastomer specifications—these determine chemical compatibility and may differ depending on whether NACE or other service options were included at manufacture.

What should I inspect before putting it into service?

Inspect the seat and trim for erosion, corrosion, or scoring that could compromise the Class VI shutoff rating, and bench-test shutoff tightness if bubble-tight performance is required for your application. Verify the actuator spring responds correctly across the 10 to 35 PSIG operating range, confirm fail-closed action on loss of air supply, and check all seals and packing for leaks. Check flange faces for damage, verify gasket seating surfaces are clean and flat, and confirm the 15-inch face-to-face dimension fits your piping—pneumatic control valves are often removed due to process changes rather than failure, but wear patterns will tell you what service conditions it saw.