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Controllable constant flow regulating lift valve

  • US 5,642,752 A
  • Filed: 01/16/1996
  • Issued: 07/01/1997
  • Est. Priority Date: 08/23/1993
  • Status: Expired due to Term
First Claim
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1. A controllable constant flow regulating lift valve having flow regulating valve means formed on an upstream side (inlet side) of the valve, sliding valve means provided for automatic flow restriction regulating operation and formed on a downstream side (outlet side) of the valve, and a flow damping chamber (c) defined between the flow regulating valve means and the slide valve means;

  • said controllable constant flow regulating lift valve comprising;

    a partition wall (5) of a valve body (1);

    a slide valve element (10) slidably fitted in the partition wall (5) with a sealing member (14) attached to the slide valve element (10) for sealing;

    a valve seat member (4) disposed opposite to the slide valve element (10) so as to form a slide valve opening (d) between the valve seat member (4) and the slide valve element (10);

    a valve spindle (6);

    a flow regulating valve element (7);

    a balancing spring (13) extended between an end wall (11) of the slide valve element (10) and the flow regulating valve element (7) in parallel to the spindle (6) and exerting a predetermined force for expanding the valve opening (d);

    a sealed chamber (f) formed between the end wall (11) and a valve bonnet (2) and connected to the inlet side (a) via a connecting passage (17),the pressure receiving area of the flow regulating valve element (7) and that of the end wall (11) being substantially equal to each other,a boss (8) of the flow regulating valve element (7) and a boss (12) of the slide valve element (10) being formed so as to come into contact with each other when the flow regulating valve element (7) is almost seated on a valve seat (3) formed on the valve seat member (4), andthe flow regulating valve element (7) being supported so as to be able to be moved away from the valve seat (3) by variation of the pressure in the flow damping chamber (c).

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