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Maintenance Tips:

Curtis Superior and SAF-AIR valves are designed for installation in a standard NPT port for NPT threaded valves or an AND-10050 style port for UNF threaded valves. Use a sealant on NPT threaded valves or a fuel resistant o-ring of the proper size for UNF threaded valves. Refer to aircraft manufacturer's torque specifications for the aircraft in which it is being used or to the torque specifications in the table below for Curtis valves.

Keep valves reasonably clean and replace according to the prescribed synthetic rubber maintenance schedule for the specific aircraft or every ten years per Curtis, whichever occurs first. Curtis Superior valves cannot be repaired. Replace the entire valve per the maintenance schedule of the aircraft or usable life per Curtis Superior Valve should it begin to leak.

SAF-AIR valves are designed to be disassembled and the O-rings replaced. Over time, if the valve should start to leak, check to make sure the drain valve is tight. If drain valve is found to be tight, then check the O-rings. All O-rings used are buna "n", MS29513 style, MIL-P-5315. SAF-AIR O-ring seal kits are available for most of their valves.

Thread Specifications
Thread O.D. Thread Curtis Torque Spec
0.375 3/8-24 UNF 80-85 In. Lbs
0.405 1/8-27 NPT 40-45 In. Lbs
0.438 7/16-20 UNF 80-85 In. Lbs
0.500 1/2-20 UNF 80-85 In. Lbs
0.540 1/4-18 NPT 80-85 In. Lbs
0.563 9/16-18 UNF 80-85 In. Lbs
0.625 5/8-18 UNF 100-115 In. Lbs
0.675 3/8-18 NPT 105-115 In. Lbs
0.750 3/4-16 UNF 80-85 In. Lbs
0.840 1/2-14 NPT 155-165 In. Lbs
Special Threads with Crush Washers
Valve P/N Thread Curtis Torque Spec
CCA-2450 12MM 1.75 60-75 In. Lbs
CCA-2460 1/2-20 60-70 In. Lbs
CCA-2470 12MM 1.75 60-70 In. Lbs
CCA-2480 12-50 60-70 In. Lbs

 

 

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