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Automatic shut-off dispensing nozzle responsive to liquid in a tank reaching a predetermined level and to a supply pressure

  • US 4,453,578 A
  • Filed: 01/12/1983
  • Issued: 06/12/1984
  • Est. Priority Date: 01/12/1983
  • Status: Expired due to Term
First Claim
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1. An automatic shut-off dispensing nozzle comprising a body having an inlet, an outlet, and passage means connecting said inlet to said outlet, valve means in said passage means for controlling liquid flow from said inlet to said outlet, movable means to move said valve means to an open position, holding means to hold said valve means in an open position, a first chamber in said body, a first diaphragm forming a first wall of said first chamber, a second diaphragm, venturi means disposed in said passage means downstream of said valve means to create a venturi effect when liquid flows through said passage means from said inlet to said outlet due to activation of a pressurized source communicating with said inlet, said venturi means including a valve seat, first passage means in said valve seat forming part of said passage means between said inlet and said outlet, second passage means in said valve seat providing communication of said first passage means with the atmosphere and said first chamber, and a valve cooperating with said valve seat to block said first passage means in said valve seat, means to urge said valve of said venturi means into engagement with said valve seat of said venturi means when the pressure in said passage means reaches a predetermined pressure greater than zero, release means to release said holding means resulting in said valve means being moved to its closed position, said first diaphragm being connected to said release means to render said release means effective upon movement of said first diaphragm in response to a partial vacuum created in said first chamber when the level of the liquid in a tank being filled reaches a predetermined level to block communication of said second passage means in said valve seat of said venturi means with the atmosphere, causing means to cause movement of said second diaphragm to a release position only when the pressure in said passage means is less than the predetermined pressure at which said urging means of said venturi means urges said valve of said venturi means into engagement with said valve seat of said venturi means, responsive means responsive to movement of said second diaphragm to its release position to render said release means effective when said second diaphragm is moved to its release position by said causing means, said responsive means allowing said first diaphragm to be moved in response to the partial vacuum created in said first chamber to render said release means effective when said second diaphragm is not in its release position, and relief means to decrease the pressure to substantially zero in said passage means when said valve of said venturi means engages said valve seat of said venturi means upon inactivation of the pressurized source communicating with said inlet to allow said second diaphragm to be moved to its release position by said causing means, said relief means communicating said passage means upstream of said valve of said venturi means with the atmosphere when said valve of said venturi means engages said valve seat of said venturi means.

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