A pressure regulating and pressure relief valve, has a valve body defining an inlet port, outlet port, valve seat and pressure relief opening. A pressure regulating plug is displaced during a first portion of a motion from an open position, which provides a continuous flow path from the inlet port to the outlet port, to a closed position in which the plug is closed against the valve seat to obstruct the continuous flow path. A spring biases the plug to the open position. An actuation surface is exposed to a pressure at the outlet port that displaces the plug against the spring bias toward the closed position. Further displacement of the plug beyond the closed position during a second portion of the motion that is beyond a range of the first portion of the motion, opens a relief flow path from the outlet port through the pressure release opening.

A pneumatically operated gas valve mounted on a vessel containing pressurized gas. The gas valve includes a piston positioned in a cylinder with one closed end so that the piston seats against a gas outlet to close the gas valve. A control reservoir is formed in the cylinder between the piston and the closed end of the cylinder. Upon filling vessel, some of the pressurized gas enters the control reservoir to provide a control pressure behind the piston. Actuating the control mechanism vents the control reservoir, resulting in the gas valve opening rapidly to release the pressurized gas in the vessel through an exhaust port of the gas valve.

A bleed valve includes a housing with an inlet coupled to an outlet by a duct, a guide tube with an orifice fixed in the housing between the inlet and the outlet, a piston, and baffle. The piston is slideably supported on the guide tube and is movable between an open and a closed position, the duct fluidly coupling the inlet and outlet in the open position, the duct fluidly separating the inlet and outlet in the closed position. The orifice fluidly couples the inlet and outlet in the open and closed positions to move piston between the open and closed positions according to differential pressure between the bleed valve inlet and outlet. The baffle is slideably supported by the guide tube to set the differential pressure at which the piston moves between the open and closed positions. Gas turbines and differential pressure adjustment methods are also described.

A bleed valve for use in a gas turbine engine of an aircraft includes a high-pressure cavity coupled to a valve terminal, which is itself coupled to a cap, which cap includes a valve seat configured to be sealed by a tube that serves as the valve gate. The tube is operably coupled to a movable end of a bellows, which is positioned within the high-pressure cavity. The opening and closing of the valve is controlled by the movement of the bellows within the high-pressure cavity, and, in turn, the movement of the tube towards the valve seat, with the valve closing as the bellows compresses.

A valve assembly includes a fluid flow passage, a valve seat, and an actuator assembly. The actuator assembly includes an actuator body stationary relative to the valve seat and a valve member moveable relative to the valve seat between a first position in which the valve member engages the valve seat, and a second position in which the valve member is remote from the valve seat. The valve member includes at least one orifice extending therethrough. The actuator assembly further includes a bellows attached to the valve member and to the actuator body. An interior surface of the bellows, the actuator body, and the valve member define a control chamber therebetween. An exterior surface of the bellows and the valve member define an outer volume therebetween such that the outer volume is around the control chamber. The at least one orifice fluidly communicates the control chamber with the outer volume.

A pneumatically controlled valve unit is specified, having a main valve for controlling a fluid flow of a fluid to be dosed. The valve unit has a piston shiftably mounted in a valve chamber, operating against a return device, and connected to a valve closing body of the main valve to open and close the main valve. The piston delimits a pressure chamber within the valve chamber such that the piston can be shifted against the return device by pressurizing the pressure chamber, wherein a position sensor is provided which is set up to detect the position of the piston in the valve chamber. One respective pressure line leads from the pressure chamber to a pressure fluid port and a ventilation port, wherein an aeration valve is arranged in one pressure line and a ventilation valve is arranged in the further pressure line, and wherein a control unit is provided which is set up to switch the aeration valve and the ventilation valve on the basis of the position of the piston detected by the position sensor to regulate a pressure in the pressure chamber for shifting the piston. Furthermore, a valve system comprising at least one valve unit, and a method of operating the valve unit are specified.

A device is provided for controlling the flow of a fluid through a conduit from an upstream side to a downstream side of the device. The device includes a valve aperture, a cylindrical mounting member on the downstream side of the valve aperture, a valve member on the outside of the cylindrical mounting member that moves reciprocally to open and close the valve aperture, a control volume defined between the cylindrical mounting member and the valve member, an arrangement for introducing a control pressure into the control volume, and a seal between the outer surface of the cylindrical mounting member and the inner surface of the valve member that substantially seals the control volume. The valve member is acted on by the pressure of the upstream side (P.sub.1) and the control pressure (P.sub.4) so as to be moved by the difference between these pressures.

A control valve that includes a split valve body. The split valve body includes a first body portion, a second body portion, a flow path, an inlet port, and an outlet port. The flow path passes through the first body portion and the second body portion. The first body portion is coupled to the second body portion. The control valve also includes a valve seat. The valve seat is disposed between the first body portion and the second body portion. The control valve also includes a valve plug. The valve plug is movable relative to the valve seat to control fluid flow through the control valve.

A valve assembly for a turbine engine includes a valve arranged in an air flow path. The valve has a shaft. The valve is movable between an open position and a closed position. A hydraulic actuator is coupled to the shaft. The hydraulic actuator is configured to utilize fuel as a working fluid. The hydraulic actuator is configured to move the valve between the open position and the closed position.

A hydrant valve with an internal automatic shut-off valve. The internal valve blocks communication between a piston chamber and a hydrant chamber when in a closed position. An upper valve opens the internal valve against its biasing force permitting the flow of fluid between the hydrant chamber and the piston chamber. The internal valve closes in response to a disconnection of the upper valve.