(Inventor)Ī valve assembly for an in-space propulsion system includes an inlet tube, an outlet tube, a valve body coupling the inlet tube to the outlet tube and defining a propellant flow path, a valve stem assembly disposed within the valve body, an actuator body coupled to the valve body, the valve stem assembly extending from an interior of the valve body to an interior of the actuator body, and an actuator assembly disposed within the actuator body and coupled to the valve stem assembly, the actuator assembly including a shape memory actuator member that when heated to a transition temperature is configured to enable the valve stem assembly to engage the outlet tube and seal the propellant flow path.ĭual-latching solenoid- actuated valve assemblyīrudnicki, Myron J. Shape Memory Actuated Normally Open Permanent Isolation Valve A valve actuator assembly and engine are also provided incorporating the disclosed drive piston assembly. At least one of the drive piston and the boost sleeve is sufficiently configured to move within the generally stepped bore in response to fluid pressure within the main fluid chamber to selectively open the poppet valve. First and second feedback chambers are at least partially defined by the drive piston and each are disposed at opposite ends of the drive piston.
A main fluid chamber is at least partially defined by the generally stepped bore, drive piston, and boost sleeve. A drive piston is movable within the generally stepped bore and a boost sleeve is coaxially disposed with respect to the drive piston. The drive piston assembly includes a cartridge defining a generally stepped bore. The assembly combines an oxidizer shutoff valve and a fuel shutoff valve which are mechanically linked and operated by a single high-speed solenoid actuator.ĭrive piston assembly for a valve actuator assemblyĪ drive piston assembly is provided that is operable to selectively open a poppet valve. Valve assembly simultaneously starts or stops the flow of oxidizer and fuel from separate inlet channels to reaction control motors.
Fuel and oxidizer valve assembly employs single solenoid actuator
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