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Automotive emission control valve with a counter-force mechanism

  • US 6,000,677 A
  • Filed: 08/25/1997
  • Issued: 12/14/1999
  • Est. Priority Date: 08/25/1997
  • Status: Expired due to Term
First Claim
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1. An electric-operated valve assembly comprising a body having an internal main flow passage between a first port and a second port, an annular valve seat in circumscribing relation to the passage, an operating mechanism comprising an electric actuator including an armature, a valve which is operated by the armature to selectively open and close the passage and to which a force due to pressure differential between the ports is applied when the valve is closing the passage, a counter-force mechanism that, when the valve is closing the passage, applies a counter-force to the valve opposite the force due to pressure differential between the first and second ports, the counter-force mechanism including a chamber space that is internal to the body and bounded in part by a fluid-impermeable movable wall that extends between and is sealed to both the body and the valve, and a communication passage that communicates one of the ports to the chamber space when the valve is closing the passage, wherein the valve comprises plural parts in assembly relation, one of the plural parts being a valve head and another of the plural parts being a retainer, the valve head and the retainer coacting to hold the movable wall sealed to the valve, and wherein a fastener passes through both the valve head and the retainer to hold the valve in assembly with the armature.

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