Ball valve FSDMOFSV1

electricfor controlisolation

The motor-operated fuel shutoff valve is spar-mounted and is driven by a 28 VDC brush-type motor actuator to open and close when electrically commanded. This type of motor-operated fuel shutoff valve is either a ball-valve style or barrel type and is designed with one or more of the following - functions: (1) to cut-off fuel flow into the engine in the event of a fire, (2) to allow fuel cross transfer between left and right wing tanks for in- - flight CG control, and (3), and to provide APU isolation. - The material and finishes used in the construction of the valve and those of similar, previously qualified, valves are unaffected by several - environmental conditions listed in RTCA DO-160 and MIL-STD-810. This elegantly simple design is extremely reliable and several variations of - this valve have been produced by Parker for over 30 years. - The actuator mounted on top of the valve is capable of driving the valve from OPEN to CLOSED and from CLOSED to OPEN with a nominal 28 - VDC motor and maintains the last commanded position in the event of a dual command. - When the actuator is electrically commanded to open, supply voltage is applied directly to the motor to overcome the initial high-friction - torque and drives the ball/barrel valve open. At the end of the stroke, the power-limiting switch turns off the supply voltage to the motor and - causes the motor to stop. The end stroke-position switch is also activated; sending full open indication signal to the controller. Upon - electrical command to close, a relay changes voltage direction to the motor and the actuator travels back to the closed position.