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VALVES

  • US 20130118344A1
  • Filed: 07/27/2011
  • Published: 05/16/2013
  • Est. Priority Date: 07/29/2010
  • Status: Active Grant
First Claim
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1. Apparatus for gas compression and expansion, comprising:

  • a chamber for receiving a gas;

    a positive displacement device moveable relative to the chamber;

    first and second valves activatable to control gas flow into and out of the chamber; and

    a controller configured to control activation timing of the first and second valves;

    wherein the controller is configured to selectively switch operation of the positive displacement device between a compression mode in which the gas received in the chamber is compressed by the positive displacement device and an expansion mode in which the gas received in the chamber is expanded by the positive displacement device, and wherein the controller is configured to selectively change the activation timing of at least one of the first and second valves during operation in a first mode of the compression and expansion modes to selectively switch from the first mode to a second mode of the compression and expansion modes.

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