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Rotary control valves with pressure-reducing means

  • US 4,665,946 A
  • Filed: 08/30/1985
  • Issued: 05/19/1987
  • Est. Priority Date: 08/30/1985
  • Status: Expired due to Fees
First Claim
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1. A rotary control valve, comprising:

  • a casing having a center axis and defining a pair of axially-opposed, inlet and outlet ports;

    a valve chamber in said casing, said chamber having a pair of axially-opposed, off-center inlet and outlet orifices operatively and respectively associated with said inlet and outlet ports;

    a valve stem extending through said valve chamber and having an axis of rotation coaxial with said center axis for adjustably rotating said chamber in said casing about said axis of rotation;

    each orifice being contiguous to and movable into and out of partial and full registration with its cooperating port, and said orifices being shaped for controlling the flow through said ports;

    means including said orifices for providing a predetermined pressure reduction for each adjusted angular position of said valve chamber; and

    an off-center discharge tube disposed inside said cavity substantially parallel to said stem, and said tube extending between said orifices.

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