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.

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.