Engine Feed Shutoff Valve

Engine feed shutoff valves are ball valves that are comprised of an aluminum alloy body assembly and ball, PTFE-based ball seats, and a stainless steel drive shaft. Each are installed with, and are operated by motor actuators that are powered at a nominal 28 VDC. Together, the engine feed shutoff valves and associated motor actuators provide a reliable, commanded capability to cut-off fuel flow to the engines within a few seconds.
Each engine feed shutoff valve is installed in an engine feed fuel line to prevent hazardous quantities of fuel from flowing into designated fire zones in the vacells. A thermal relief valve is incorporated in the design that bridges between the outlet and inlet sides of the ball to prevent excessive pressure build-up due to thermal expansion of the fuel in the fuel lines following an engine shutdown.