Abstract: A valve actuator (6) selectively opens and closes a plurality of valves (8). The actuator includes a drive motor (5) that selectively rotates a first rotor (4) about an axis (0) in first and second rotational directions. A second rotor (2) is rotatable about the axis only in the first rotational direction. Actuating fingers (3) are movably mounted in operative connection with the first rotor through drive pins (4a) and are guided to move radially by guides (2a) positioned on the second rotor. A coupling including drive rods (4b) which extend from the first rotor and are movable within arcuate slots (2b) on the second rotor, enables relative rotational movement of the rotors and the outer ends of the actuating fingers to be selectively radially extended and retracted. The outer ends of the actuating fingers are engaged with one or more valves to control the flow of working fluid.

Abstract: A shaped memory alloy (SMA) valve assembly includes a plurality of SMA valves and a main printed circuit board carrying electronic components and conductors for operating the SMA valves. Each SMA valve includes a pressure chamber having a port. Each pressure chamber contains a valve element biased to a rest position in sealing abutment on a valve seat of the port, a SMA actuator, and an actuator printed circuit board for mounting and electrically connecting the SMA actuator. Each actuator printed circuit board portion is connected to the main printed circuit board portion by a bridge printed circuit board portion, and each pressure chamber has an opening to allow a respective bridge printed circuit board portion to extend therethrough. The opening is provided with a pocket filled with cured sealing glue to embed the bridge printed circuit board portion extending therethrough and to seal the opening of the pressure chamber.

Abstract: A shaped memory alloy (SMA) valve assembly includes a plurality of SMA valves and a main printed circuit board carrying electronic components and conductors for operating the SMA valves. Each SMA valve includes a pressure chamber having a port. Each pressure chamber contains a valve element biased to a rest position in sealing abutment on a valve seat of the port, a SMA actuator, and an actuator printed circuit board for mounting and electrically connecting the SMA actuator. Each actuator printed circuit board portion is connected to the main printed circuit board portion by a bridge printed circuit board portion, and each pressure chamber has an opening to allow a respective bridge printed circuit board portion to extend therethrough. The opening is provided with a pocket filled with cured sealing glue to embed the bridge printed circuit board portion extending therethrough and to seal the opening of the pressure chamber.