Abstract: A separator plate and a frame member for an electrochemical cell are provided. The separator plate includes a plurality of protrusions extending therefrom to define a flow field. A pair of end features arranged along opposite sides of the flow field, each end feature extending substantially the length of the flow field. A periphery portion is provided having a first set of openings and a second set of openings. Wherein the plurality of protrusions and pair of end features extend from a plane defined by the periphery portion. The frame member includes features for facilitating assembly and reducing the risk of an over constrained condition. The frame member further having ports divided by a bridge member to support the frame member under operating pressures.

Abstract: A separator plate and a frame member for an electrochemical cell are provided. The separator plate includes a plurality of protrusions extending therefrom to define a flow field. A pair of end features arranged along opposite sides of the flow field, each end feature extending substantially the length of the flow field. A periphery portion is provided having a first set of openings and a second set of openings. Wherein the plurality of protrusions and pair of end features extend from a plane defined by the periphery portion. The frame member includes features for facilitating assembly and reducing the risk of an over constrained condition. The frame member further having ports divided by a bridge member to support the frame member under operating pressures.

Abstract: An electrochemical cell is provided. The electrochemical cell includes a first frame, the frame having at least one first cleat feature arranged on one side, the at least one first cleat feature having a first height. A second frame is provided having at least one second cleat feature arranged on one side, the at least one second cleat feature having a second height. A membrane electrode assembly (MEA) is disposed between the first and second frame, the MEA having a first electrode disposed on a first side of a membrane and a second electrode disposed on a second side opposite the first electrode. A first gasket is disposed between the membrane and the first frame, the first gasket engaging the at least one first cleat feature. A second gasket is disposed between the membrane and the second frame, the second gasket engaging the at least one second cleat feature.

Abstract: A positioning system includes an actuator, valve (preferably pneumatic), position sensor and an electronic valve controller, integrated in a single unit. Continuously variable setpoints are possible within the range of operation. A preferred control circuit includes a signal converter, a ramp generator to smooth the shape of the command or target value signal applied, a position feedback sensor to report the actual position of the actuator, a controller, and a driver, containing an H-bridge, for controlling the pneumatic valve which feeds air into the actuator mechanism. Integration of all these components into a single unit shortens signal paths, improves resistance to electrical noise, and permits faster response time.

Abstract: In order to provide proportional control of a poppet valve or a gate valve, adapted for fluid power applications, an electrical voice coil is used to move the gating element. Further, a preferred embodiment includes a feedback means for detecting and regulating the position of the gating element, for example to compensate for any perturbing mechanical vibrations. The result is a valve which closes securely, is infinitely variable within a range, and can make up to a full stroke, from fully closed to fully open, within 3 to 10 milliseconds, compared to the 15 milliseconds needed by a solenoid. Due to its fast response time, the improved valve mechanism provides much faster tracking of any changes in an applied command signal. Suitable applications are mechanical testing devices, and other repetitive motions situations, such as industrial automation and animatronics.