| CPC F02C 7/22 (2013.01) [F02C 7/236 (2013.01); F02C 9/263 (2013.01); F02C 9/26 (2013.01); F05D 2220/323 (2013.01); F05D 2240/35 (2013.01)] | 15 Claims |
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1. A fuel system, comprising:
a selection and shutoff valve (SSOV) configured to:
in a first state:
allow a primary flow having a primary flow pressure to pass therethrough such that the primary flow can travel to an output line;
communicate a primary input of the SSOV to a primary output of the SSOV that is in fluid communication with the output line;
communicate a secondary flow source input of the SSOV to a secondary flow destination output of the SSOV to allow a secondary flow to flow from a secondary flow source to a secondary flow destination; and
prevent fluid communication between a low pressure port of the SSOV and a bypass valve port of the SSOV in fluid communication with a bypass valve (WMBV) via a bypass line;
in a second state:
shut off the primary flow to prevent the primary flow from travelling to the output line;
allow the secondary flow from the secondary flow source to pass therethrough such that the secondary flow can travel to the output line; and
communicate the low pressure port to the bypass valve port to communicate a low pressure to the WMBV;
wherein, the SSOV includes a back pressure port configured to be in fluid communication with a back pressure line such that a back pressure acts on the SSOV to bias the SSOV toward the second state such that when the back pressure exceeds a primary flow pressure of the primary flow, the SSOV moves to the second state.
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