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Flow control

  • US 4,204,808 A
  • Filed: 04/27/1978
  • Issued: 05/27/1980
  • Est. Priority Date: 04/27/1978
  • Status: Expired due to Term
First Claim
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1. Apparatus comprising:

  • a primary pumping means having a suction input and a discharge output;

    a valve means;

    means for connecting said discharge output to said valve means;

    means for establishing a first signal which is a function of the pressure at said suction input, said first signal having a first range and a second range, where at least a part of the first range of said first signal is outside the second range of said first signal and at least a part of the second range of said first signal is outside the first range of said first signal;

    means for varying the throughput of said primary pumping means in response to the first range of said first signal to maintain the pressure at said suction input within an acceptable range;

    means for restricting the discharge through said valve means in response to the second range of said first signal to maintain the pressure at said suction input within an acceptable range, the first range and the second range of said first signal being selected in such a manner that said valve means will be generally fully open when said first signal is in the first range; and

    means adapted to supply said first signal to said means for varying and to said means for restricting.

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