Abstract: A steering system for a vehicle that uses primary and secondary steering actuation devices in combination with primary and secondary valve elements to provide fluid flow within a valve body. The primary and secondary valve elements are both electrically actuated by a control unit such that if the primary steering actuation device or valve element fails the secondary steering actuation device and valve element can supply pilot oil to the system.

Abstract: A variable flow control valve for multiport injection of pressurized liquid through an array of injection nozzles for a gas turbine engine is connected by nozzle ports to the engine. The valve includes a slidable valve element which progressively opens and closes a plurality of first ports by sliding triangular apertures thereover. A plurality of second ports communicate with a chamber containing the slidable valve element, the second ports also communicating with individual compensators that are in communication with the first ports and nozzle ports. The compensators connect the first ports to the nozzle ports through variable flow valves which are biased to the fully open opposition against the pressure of liquid in the second ports. By so configuring the flow control valves, pressure in the chamber compensates for pressure surges in the pressurized liquid by reducing flow through the variable flow valves in response to pressure increases in the pressurized fluid.

Abstract: A flow control valve for multiport injection of pressurized liquid through an array of injection nozzles for a gas turbine engine is connected by nozzle ports to the engine. In accordance with a first embodiment, the valve includes a slidable valve spool which progressively opens and closes a plurality of radially opening first ports. In accordance with a second embodiment the valve employs a rotatable disc which progressively opens and closes a plurality of axially opening first ports. Both embodiments utilize non-circular apertures to effect opening of the first ports. A plurality of second ports communicate with a chamber containing the valve spool or rotatable disc, the second ports communicating with individual compensators that are also in communication with the first ports and nozzle ports. The compensators connect the first ports to the nozzle ports through a variable flow valve which is biased to the fully open opposition against the pressure of liquid in the second ports.

Abstract: An improved valve for controlling flow of water to a turbine engine is disclosed. A hydraulically actuated spool valve controls the volume of water flow. An inventive seal and drain system ensures that no hydraulic oil mixes with the water being directed to the turbine engine, which would increase emissions from the engine. Further, the system ensures that no water will intermix with the hydraulic fluid in the pressure chambers for the spool valve, which could degrade the oil in the hydraulic system.