High pressure diaphragm valve

  • US 4,014,514 A
  • Filed: 06/27/1975
  • Issued: 03/29/1977
  • Est. Priority Date: 06/27/1975
  • Status: Expired due to Term
First Claim
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1. In a valve comprising a valve body defining inlet and outlet ports and a closure port communicating therewith, a valve bonnet fixed on the valve body over the closure port, a compressor reciprocable toward and away from the closure port, a flexible diaphragm overlying the closure port and movable by the compressor into engagement with the closure port to block fluid flow through the closure port and alternatively movable away from the closure port to permit progressively greater fluid flow through the closure port, the improvement comprising an annular limit plate secured between the valve bonnet and the valve body, the plate including first non-compressive centering means for centering the limit plate relative to the valve bonnet, second non-compressive centering means for centering the limit plate relative to the valve body, central passage means permitting at least partial passage of the compressor through the plate, an upper surface positioned for abutting engagement of compressor stop means to halt motion of the compressor toward the closure port at a predetermined distance from the closure port so as to prevent excessive crushing of the diaphragm interposed between the closure port and the compressor, and a lower surface having a first concavity adapted to abuttively support a bulbous diaphragm shoulder portion, the radially interior edge of the first concavity being substantially aligned with the shoulder of the compressor when the compressor and diaphragm are fully retracted into a valve fully opened position, the compressor and limit plate thus providing a substantially completely abuttive and supportive structure for the diaphragm when the compressor and diaphragm are fully retracted into a valve fully opened position.

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