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Fluid level control valve

  • US 3,895,645 A
  • Filed: 03/09/1973
  • Issued: 07/22/1975
  • Est. Priority Date: 03/09/1973
  • Status: Expired due to Term
First Claim
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1. Apparatus for controlling the level of liquid in a tank having a liquid inlet opening in its floor, said apparatus comprising in combination a housing including a body and a cover having interfacing generally uniplanar surfaces defining a valve chamber and a diaphragm chamber therebetween, said body including a valve seat in said valve chamber generally in the plane of said interfacing surfaces, an integral projection of said body adapted to be received in the liquid inlet opening in the floor of the tank for mounting the housing in a normally submerged position, a liquid inlet passage defined at least in part by said projection and leading to said valve seat, liquid outlet passage means in said housing leading from said valve seat to the exterior of said housing, an air passage defined at least in part by said projection and leading to said diaphragm chamber, a diaphragm in said diaphragm chamber having its periphery sealingly engaged between said interfacing surfaces, a flexible valve member in said valve chamber having its periphery held between said interfacing surfaces, a pressure sensing passage in said cover leading from the exterior of said housing to said diaphragm chamber, said diaphragm being interposed in said diaphragm chamber between said air passage and said pressure sensing passage, and operating means for moving said valve member relative to said valve seat in response to movement of said diaphragm.

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