Cartridge valve FSDAIPRSOV

pneumatically-operatedfor controlshut-off

Parker Aerospace anti-ice pressure regulating shut-off valve controls the application of HP3 air to the downstream anti-ice pressure relief valve to maintain the engine intake (nacelle) free from ice under fault-free operation. The anti-ice pressure regulating shut-off valve is pneumatically operated. The valve is normally spring-loaded open. Pressurized servo air is - fed to the valve from the solenoid bank in order to command the valve to shut-off or regulating mode. The anti-ice pressure regulating shut- - off valve is mounted on the combustion outer casing within zone three of the engine. - The pressure regulating shut-off valve has three modes of operation — OPEN, REGULATING, and CLOSED. When the regulating servo port and - the shut-off servo port of the anti-ice pressure regulating shut-off valve are vented or pressurized by de-energizing or energizing the - corresponding solenoid of the remote solenoid bank, each of the three modes of operation are realized. With an inlet pressure of more than - 75 psig, and with the pressure regulating shut-off valve in REGULATING condition, the outlet pressure from the pressure regulating shut-off - valve will be 75 psig, nominal. - In the event of the anti-ice pressure relief valve failing to regulate the air supplied to the nacelle, the anti-ice pressure regulating shut-off valve - will provide regulation functionality when commanded via a control input from a dedicated solenoid, located on the solenoid bank in zone - two.