Fluid handling – With indicator – register – recorder – alarm or inspection means – Fluid pressure responsive indicator – recorder or alarm
Patent
1997-03-03
1999-02-09
Ferensic, Denise L.
Fluid handling
With indicator, register, recorder, alarm or inspection means
Fluid pressure responsive indicator, recorder or alarm
137113, 1374875, 25112904, E03B 707
Patent
active
058681620
ABSTRACT:
An automatically switching valve measures pressure at an outlet line using an electric, pressure-sensitive switch which can be set to close at a predetermined pressure threshold within relatively narrow tolerances such that a pressure regulator can be placed between the pressurized gas supply tanks and the switching valve. Closing of the pressure-sensitive switch in response to the drop in pressure below the predetermined threshold sends an electric signal to a relay. In response to the electric signal, the relay causes a different inlet line to be selected, thus changing the particular pressurized gas supply from which the outlet line receives pressurized gas. When gas is supplied through a first inlet line, an electric signal from the pressure-sensitive switch causes the relay to toggle to supply gas through a second inlet line. A subsequent signal from the pressure-sensitive switch causes the relay to toggle back to again supply gas through the first inlet line. No manual resetting of the switching valve according to the present invention is required. The electric signal of the pressure-sensitive switch also triggers a remote signaling device to signal a remote location. For example, the electric signal can trigger dialing of a predetermined telephone number by an automatic dialer. When connected to the remote location, the dialer can transmit a predetermined message which uniquely identifies a particular pressurized gas dispensing installation as the installation in which an empty pressurized-gas supply is detected.
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patent: 5554976 (1996-09-01), Miyauchi et al.
Ball John
Ferensic Denise L.
Ivey James D.
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