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Directional Control Valve

  • US 20170328380A1
  • Filed: 05/15/2017
  • Published: 11/16/2017
  • Est. Priority Date: 05/16/2016
  • Status: Active Grant
First Claim
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1. A valve section comprising:

  • a valve body having (i) a longitudinal bore, (ii) a fluid inlet passage, and (iii) a workport configured to be fluidly connected to an actuator;

    a spool axially movable in the longitudinal bore to shift between (i) a neutral position at which the spool is configured to block fluid flow to the workport, and (ii) a shifted position at which the spool is configured to permit fluid flow thereacross, wherein the valve body further includes a flow path disposed downstream from the spool and configured to fluidly couple the spool to the actuator through the workport;

    a pressure compensator valve located downstream from the fluid inlet passage and upstream from the spool and configured to regulate fluid flow from the fluid inlet passage to the spool, wherein the valve body further includes a regulated-flow fluid passage configured to communicate fluid from the pressure compensator valve to the spool; and

    a counterbalance valve disposed in the flow path, wherein the counterbalance valve includes a pilot pressure port, wherein the counterbalance valve is configured to open the flow path in response to a pilot pressure received at the pilot pressure port, wherein the valve body further includes a pilot pressure passage configured to communicate fluid to the pilot pressure port, and whereinwhen the spool is in the neutral position, the pilot pressure passage is disconnected from the regulated-flow passage, and when the spool is in the shifted position, the pilot pressure passage is connected across the spool to the regulated-flow fluid passage, such that the pilot pressure is derived from the regulated-flow fluid passage downstream from the pressure compensator valve to open the counterbalance valve.

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