Aerospace-Hydraulic Switching Valve, Pressure or Pilot Operated

Standard:
Scope:

This SAE Aerospace Recommended Practice (ARP) establishes the requirements for the design, manufacture, and qualification of four hydraulic switching valves used in airborne applications. Two are pressure operated, Type IA and IB and two are solenoid/pilot operated, Type IIA and IIB. They are applicable to four pressure classes 3000, 4000, 5000 and 8000 psi. The equipment as designed is intended to be installed in hydraulic systems designed to AS5440 for military applications or ARP4752 and ARP4925 depending on the type of aircraft for commercial applications. Additional or refined requirements shall be contained in the detail (procurement) specification and these shall take precedence over any potentially conflicting requirements of this ARP or documents referenced by this ARP.

Rationale:

Five year review noted that minor clerical errors were present. Burst pressure statement is not consistent with AS8775 or AS4941. The lessons learned section calls out a clearance with a decimal off.

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