Abstract: A gas turbine engine valve is disclosed. In one form the valve includes two inlets in fluid communication with an outlet. The valve can include a spool having two lands capable of selectively closing either of the two inlets. The valve can include energy storage devices that initially position the spool within a valve housing. A temperature motor is provided to position the spool based upon a temperature of a mixture of working fluid from the two inlets. A working fluid flowing into the first inlet can be in fluid communication with a second end of the valve; and a working fluid flowing into the second inlet can be in fluid communication with a first end of the valve. A relatively high pressure condition at one or the other of the inlets can be used to alter a position of the valve.

Abstract: A field device is coupled to a process through at least one process interface element. The process interface element may be a field device flange, a manifold, or a process flange. The process interface element has a temperature sensor attached thereto, and is adapted to receive a thermal source. In one embodiment, the thermal source is one or more electrical heaters. In another embodiment, the thermal source is thermal transfer fluid tracing through the process interface element. A controller is coupled to the temperature sensor and is adapted to control the heat applied to the process interface element based upon the temperature of the process interface element measured by the temperature sensor.

Abstract: A duct pressure powered air volume controller controls the flow through a terminal responsive to the differential pressure across a nozzle plate, the selected ventilation requirements, and the temperature of the supplied air, the zone and the setpoint.