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Hydraulic control valve for construction machinery

  • US 8,631,820 B2
  • Filed: 02/09/2011
  • Issued: 01/21/2014
  • Est. Priority Date: 02/10/2010
  • Status: Active Grant
First Claim
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1. A hydraulic control valve for construction machinery for taking in pressure oil from one of a tandem path and a parallel path which are connected to a variable delivery pump, whereina check valve unit is fixedly incorporated in a casing, the check valve unit having an opening portion on an inner peripheral side of a housing portion, and slidably and unrotatably housing a valve body of a first check valve which operates so as to block communication with the tandem path in a state in which the pressure oil from the parallel path is supplied, anda pressure-oil path from the parallel path is formed between an inner peripheral surface of the housing portion of the check valve unit and an outer peripheral surface of the valve body;

  • wherein the valve body of the first check valve comprises;

    a seating part that is larger in width than the opening portion of the check valve unit, which comes into contact with the housing portion of the check valve unit when the check valve unit closes;

    a first section connected to the seating part that is smaller in width than the opening portion of the check valve unit;

    a second section connected to the first section that is smaller in width than the first section; and

    a rib formed in a sliding direction on an outer surface of the second section, the rib having a predetermined length; and

    wherein a groove for receiving the rib is formed on the inner peripheral surface of the housing portion of the check valve unit.

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