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.
The anti-ice pressure regulating shut-off valve is mainly made out of Inconel 718 and 17-4PH. Carbon seal assemblies and bushings are used to provide robust operation at high-temperature conditions.
APPLICATIONS: Commercial aircraft engines
FEATURES AND ATTRIBUTES:
• Robust against high pressure and high temperature
• Designed to withstand high-vibration levels
• Chromed-bore surfaces coupled with carbon bushings and seals for wear resistance
At Parker, our pneumatic subsystem expertise complements our fuel subsystem and fluid conveyance abilities in the engine environment. Available for virtually any specification or application, our cost-effective subsystems and components are well proven and reliable.
Designed for extreme engine environments, our engine controls offer a wide range of seamlessly integrated and optimized selections using advanced designs, materials, and actuation technologies.
Minimum Operating Pressure (psig)
17 psia at 395ºF
Maximum Working Pressure (psig)
350 psia at 1016ºF
Servo and Inlet: 655 psia at room temperature
Servo and Inlet: 1404 psia at room temperature
Opening, regulating, and closing: 6 seconds each
Operating Temperature (F)
540ºF surrounding air temperature, peak
Minimum Ambient Temperature (F)
395ºF duct air minimum operating
Maximum Ambient Temperature (F)
1070ºF maximum possible working duct air
Maximum Operating Temperature (F)
1016ºF duct air temperature, maximum normal working
External Leak Rate
Internal Leak Rate
Dry Weight (lbs)
12.2 lb. max
Spring-loaded open fail safe position