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Valve stem operator

  • US 3,889,924 A
  • Filed: 12/03/1973
  • Issued: 06/17/1975
  • Est. Priority Date: 12/03/1973
  • Status: Expired due to Term
First Claim
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1. A fail safe valve operator, comprising:

  • a valve body having a valve seat therein;

    a valve member mounted in the valve body for movement toward and away from the valve seat to closed and open positions, respectively;

    a valve stem connected with the valve member to move the valve member between its open and closed positions;

    motor means operatively connected with the valve stem to operate it to one of said positions;

    clutch means connected between the motor means and valve stem to selectively engage and disengage the motor means from the valve stem; and

    spring means connected with the valve stem so that when said valve stem is operated to its said one position energy is stored in the spring means, and when said clutch means is disengaged to disengage said motor means from the valve stem, the spring means acts on the valve stem to return the valve member to its other position.

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