Pilot operated diaphragm fill valve

  • US 5,836,346 A
  • Filed: 10/28/1997
  • Issued: 11/17/1998
  • Est. Priority Date: 10/02/1996
  • Status: Expired due to Term
First Claim
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1. A pilot operated diaphragm fill valve for controlling water level in a storage tank, comprising:

  • an elongated outer tubular riser and valve housing having an upper end and a lower end, a radial flange at said upper end;

    an elongated inner riser and supply tube having an upper end and a lower end, concentrically disposed in said outer riser tube and having a main valve seat at said upper end, said inner supply tube being adapted for connection to a source of water;

    a valve housing cap having means for detachable connection to said upper end of said tubular valve housing, and an annular recess in said housing cap, said valve housing cap includes a vacuum port in a top thereof;

    a main diaphragm valve mounted in said annular recess in said valve housing cap and engageable with said valve seat for controlling flow of water into said valve housing from said supply tube said main diaphragm valve includes a radially extending thin peripheral lip engaging with said vacuum port as a vacuum break valve;

    a pressure control chamber in said housing cap between said main diaphragm valve and said housing cap;

    a pin extending through said diaphragm and having a groove therein for communicating said control chamber with said inlet tube;

    a vent valve port having a valve seat in said housing cap for venting said pressure chamber;

    a float having a float arm pivotally mounted on said cap; and

    a vent valve member mounted on one end of said float arm for engaging said vent valve seat for selectively closing said vent port.

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