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Solenoid-operated pilot-actuated valve

  • US 4,505,450 A
  • Filed: 03/20/1981
  • Issued: 03/19/1985
  • Est. Priority Date: 07/13/1977
  • Status: Expired due to Fees
First Claim
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1. A solenoid-operated valve including:

  • a body portion defining a lower chamber with an internal seat and an inlet extending into said lower chamber, said body portion further defining an outlet;

    a cap portion;

    a diaphragm assembly mounted in the valve in a position to be biased against the seat and against the flow of fluids through the valve so as to control the flow of fluids through the valve from the lower chamber to the outlet, said diaphragm assembly defining a closed upper chamber in the valve with said cap portion;

    said diaphragm assembly having an integral peripheral seal interposed between said cap portion and said body portion;

    an open-ended nut threaded to said body portion coaxial with said cap portion to clamp said cap portion to said body portion;

    a bushing-like guide member mounted in said diaphragm assembly and defining an aperture extending therethrough;

    a support bracket in said lower chamber integral with said body portion;

    a stationary open-ended bleed tube mounted on said support bracket and extending through the aperture in the diaphragm assembly from the lower chamber into the upper chamber, said bushing-like guide member forming an annular passage with the outer surface of said bleed tube for restricted flow of fluid from the lower chamber into the upper chamber at a rate less than the rate of flow of fluid through said bleed tube when the bleed tube is open;

    a solenoid mounted on the cap portion of said valve and having a plunger positioned normally to close the upper end of the bleed tube; and

    exit port means including an elongated tubular member mounted on said support bracket coaxially with said outlet and coupled to the lower end of the bleed tube through a passageway in said support bracket to provide a flow path from the upper chamber through the bleed tube and through the passageway in said bracket and through said elongated tubular member to said outlet when the plunger is retracted from the upper end of the bleed tube.

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