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Variable valve timing is provided to control compressors and expanders in a fuel cell powering system in order to provide for matching the displaced volume of the compressor and expander over a range of pressure delivery requirements. A movable timing edge is positioned adjacent inlet and/or dischar

Variable valve timing is provided to control compressors and expanders in a fuel cell powering system in order to provide for matching the displaced volume of the compressor and expander over a range of pressure delivery requirements. A movable timing edge is positioned adjacent inlet and/or discharge ports to cooperate with a movable valve element with inlet and outlet slots to adjust the time and time period of open and close operations. Several embodiments are presented.

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1. A variable timing valve for a fluid supply apparatus comprisinga movable element having inlet and outlet slots therein; a cylinder head with ports comprised of inlet ports and discharge ports, the number of inlet ports equal to the number of discharge ports, inlet slots, and outlet slots, said mo

1. A variable timing valve for a fluid supply apparatus comprisinga movable element having inlet and outlet slots therein; a cylinder head with ports comprised of inlet ports and discharge ports, the number of inlet ports equal to the number of discharge ports, inlet slots, and outlet slots, said movable element positioned adjacent to said cylinder head such that said inlet and outlet slots can be moved into a first position that blocks said ports, into a second position that opens said inlet ports, and into a third position that opens said discharge ports; and a movable timing edge positioned adjacent to said cylinder head, said movable timing edge capable of blocking a portion of at least one of said inlet and discharge ports.