Abstract: A valve assembly for an anti-ice system of an aircraft. The valve assembly comprises: a valve body; a first piston; and a regulating piston. The valve body defines a valve inlet, a valve outlet, a fluid passage between the valve inlet and the valve outlet, and a core portion defining a first chamber by cooperation with the first piston and a regulating chamber by cooperation with the regulating piston. The first piston is moveable between a first position and a second position, and the regulating piston is movable between a first position and a second position. The first piston overlaps the regulating piston when the first piston is its first position and the regulating piston is in its second position.

Abstract: A valve for controlling the flow of hydraulic fluid to a hydraulic motor. The valve includes a sleeve and a spool. The sleeve includes a first fluid flow port for receiving hydraulic fluid from the supply line; a second fluid flow port for supplying hydraulic fluid to a second valve; a third fluid flow port for receiving hydraulic fluid from a first control line; a fourth fluid flow port for receiving hydraulic fluid from a second control line; and a fifth fluid flow port in fluid communication with the return line. The valve is arranged to be actuated to move the spool between a first position and a second position. When the spool is in the second position, the fifth fluid flow port is in fluid communication with the second, third and fourth fluid flow ports and the first fluid flow port is closed by the spool.

Abstract: A Stability and Control Augmentation System (“SCAS”) module includes a SCAS actuator. The SCAS actuator has a substantially cylindrical hydraulic chamber having a first and second regions. A piston is arranged for linear motion in first and second directions along an axis of the hydraulic chamber. The SCAS module also includes a valve system for controlling a flow of a hydraulic fluid into the hydraulic chamber. The valve system has: at least one supply line arranged to provide a first fluid flow path to the first region of the hydraulic chamber and/or a second fluid flow path to the second region of the hydraulic chamber, and a moveable valve member arranged to have a position between a first and second positions.

Abstract: A stability control augmentation system and method for a flight control surface of an aircraft. The system includes s an actuator operable for actuating the flight control surface, and a control valve comprising a spool and an integrated augmentation mechanism. The spool and the actuation mechanism are both moveable to open and close a fluid flow path through the control valve to control the actuator.

Abstract: A valve assembly for an anti-ice system of an aircraft. The valve assembly comprises: a valve body; a first piston; and a regulating piston. The valve body defines a valve inlet, a valve outlet, a fluid passage between the valve inlet and the valve outlet, and a core portion defining a first chamber by cooperation with the first piston and a regulating chamber by cooperation with the regulating piston. The first piston is moveable between a first position and a second position, and the regulating piston is movable between a first position and a second position. The first piston overlaps the regulating piston when the first piston is its first position and the regulating piston is in its second position.

Abstract: A pressure relief valve includes a first port configured to receive a first gas at an input pressure, a second port configured to receive a second gas at a regulating pressure and a third port in fluid communication with the first port via an orifice and configured to output the first gas at an output pressure. The valve also includes a piston movable along an axis and configured to control the passage of gas through the orifice between the first port and the second port, such that the output pressure of the gas is dependent on the axial position of the piston, a resilient member configured to bias the piston. and a chamber at least partly defined by the piston and in fluid communication with the second port, such that the force exerted by the gas within the chamber on the piston acts against the action of the resilient member.

Abstract: A pressure relief valve includes a first port that receives a first gas at an input pressure, a second port that receive a second gas at a regulating pressure, a third port in communication with the first port via an orifice and that outputs the first gas at an output pressure and a piston movable along an axis and configured to control the passage of gas through the orifice between the first port and the second port, such that the output pressure of the gas is dependent on the axial position of the piston. The valve also in include a resilient member configured to bias the piston and the valve comprises a chamber at least partly defined by the piston and in fluid communication with the second port, such that the force exerted by the gas within the chamber on the piston acts against the action of the resilient member.

Abstract: A pressure relief valve includes a first port that receives a first gas at an input pressure, a second port that receive a second gas at a regulating pressure, a third port in communication with the first port via an orifice and that outputs the first gas at an output pressure and a piston movable along an axis and configured to control the passage of gas through the orifice between the first port and the second port, such that the output pressure of the gas is dependent on the axial position of the piston. The valve also in include a resilient member configured to bias the piston and the valve comprises a chamber at least partly defined by the piston and in fluid communication with the second port, such that the force exerted by the gas within the chamber on the piston acts against the action of the resilient member.

Abstract: An apparatus for regulating a torque limiter includes a resilient member configured to exert a force on one or more components of the torque limiter that adjusts a torque limit of the torque limiter in use, a movable abutment configured to contact the resilient member, a nut rotatable about the axis and configured to contact the movable abutment such that a given rotational position of the nut corresponds to a given axial position of the movable abutment, and an anti-rotation member configured to move between first and second positions. In the first position the anti-rotation member prevents rotational movement of the nut and in the second position the anti-rotation member does not prevent rotational movement of the nut and permits rotation of the nut and, in turn, axial movement of the movable abutment to vary the force exerted by the resilient member.

Abstract: A system for moving a hydraulic actuator that uses the new type of hydraulic no-back device. In some examples, the system comprises: a hydraulic power module for pumping hydraulic fluid through the system to the actuator, a reservoir for receiving said fluid back from said system and said actuator, first and second check valves; a conduit or conduits for fluidly connecting said power module to said check valves and said reservoir; and wherein said conduit or conduits are connected so as to allow said hydraulic fluid to flow from the hydraulic power module to said first check valve, and from said first check valve into said hydraulic actuator, and from said hydraulic actuator to said second check valve and from said second check valve to said reservoir.