Fluent material handling – with receiver or receiver coacting mea – Automatic control of flow cutoff or diversion – In gas filled receivers
Patent
1997-04-03
1998-10-20
Jacyna, J. Casimer
Fluent material handling, with receiver or receiver coacting mea
Automatic control of flow cutoff or diversion
In gas filled receivers
141 21, 141 94, 141231, 137456, 137460, B65B 300
Patent
active
058232354
ABSTRACT:
A safety shut-off system especially adapted for propane delivery trucks and the like utilizes a pressure differential switch to immediately close the outlet valve of the cargo tank in the event that the differential between an initial reference pressure in the system and the current delivery pressure becomes high enough. When the delivery process is started, both sides of the pressure differential switch are simultaneously exposed to the delivery pressure so that the switch remains in a standby condition. As the delivery pressure becomes stabilized, a timer closes a trapping valve on the high pressure side of the pressure differential switch, trapping a quantity of fluid against the high pressure side of the switch to comprise a reference pressure. The other side of the switch remains in open communication with the delivery pressure so that, if the delivery pressure should abruptly fall, the higher, pre-established reference pressure on the high pressure side of the switch causes the switch to be operated, closing the shut-off valve.
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Alley Lewis F.
Brim Billy F.
A-B Products, Inc.
Jacyna J. Casimer
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