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FLOW-CONTROL PASSIVE VALVE AND DAMPING-ADJUSTABLE SHOCK ABSORBER COMPRISING SAME

  • US 20120168268A1
  • Filed: 09/02/2010
  • Published: 07/05/2012
  • Est. Priority Date: 09/03/2009
  • Status: Active Grant
First Claim
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1. A flow-control passive valve (32) for controlling flow of a fluid between an upstream space (22) at high pressure (pH) and a downstream space (28) at low pressure (pL), the flow-control passive valve (32) comprising:

  • a valve body (34, 36) in fluid communication on one side (64) with the upstream space (22) and on another side (82) with the downstream space (28), a first space (62) and a second space (66) being defined within the valve body (34, 36);

    a movable member (48) slidably received in a chamber (46) of the valve body (34, 36);

    resiliency (54) applying on the movable member (48) a force tending to keep the movable member in a given “

    non-working”

    position; and

    metering discs (56, 64, 68, 72, 76) for metering the flow of the fluid from the upstream space (22) to the downstream space (28) through the valve body (34, 36), the metering discs (56, 64, 68, 72, 76) including;

    a first fixed restrictor (64) through which the first space (62) is in fluid communication with the upstream space (22);

    a second fixed restrictor (76) through which the first space (62) is in fluid communication with the downstream space (28);

    a first variable restrictor (56, 72) a restriction amount of which depends on a position of the movable member (48) and through which the first space (62) is in fluid communication with the downstream space (28) in substantial parallel to the second fixed restrictor (76);

    a second variable restrictor (56, 68) a restriction amount of which depends on the position of the movable member (48) and through which the first space (62) is in fluid communication with the second space (66); and

    a third fixed restrictor (56, 40) through which the second space (66) is in fluid communication with the downstream space (28),wherein a pressure (p1) in the first space (62) is lower than a pressure in the upstream space (22) as a result of a pressure drop through the first fixed restrictor (64) while a pressure (p2) in the second space (66) is variable between the pressure (p1) in the first space (62) and the pressure (pL) in the downstream space (28) depending on the position of the movable member (48).

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