Patent ID: 7264017
Filing Date: 2007-09-04
Classification: B64D,F16K,Y02T,Y10T

Abstract:
1. An aircraft environmental control system valve, comprising: a valve body defining a flow passage; a motor adapted to receive valve position command signals representative of a commanded valve position, the motor configured, in response to the valve position command signals, to rotate in a commanded direction; a valve element disposed at least partially within the flow passage and moveable between an open position and a closed position, the valve element at least partially responsive to motor rotation to move to the commanded valve position; and a pneumatic actuator coupled to the valve body and adapted to sense fluid pressure in the flow passage upstream of the valve element, the pneumatic actuator configured to supply an open drive force that moves the valve element to the open position solely when the sensed fluid pressure reaches a predetermined value, regardless of the commanded valve position.