Fluent material handling – with receiver or receiver coacting mea – Automatic control of flow cutoff or diversion – Level or overflow responsive
Patent
1981-08-24
1983-09-20
Bell, Jr., Houston S.
Fluent material handling, with receiver or receiver coacting mea
Automatic control of flow cutoff or diversion
Level or overflow responsive
137109, 137393, 251 63, 251320, B65B 304
Patent
active
044050003
ABSTRACT:
An automatic shutoff valve has a main inlet, a main outlet, and a main passage from the main inlet to the main outlet formed in a valve body. A piston chamber formed in the valve body has a valve seat in the main passage. A piston is movable back and forth through the piston chamber between a first position in engagement with the valve seat to close the main passage and a second position out of engagement with the valve seat to open the main passage. A first seal lies between the piston and the piston chamber to create on the piston a first area against which fluid pressure in the main passage acts to urge the piston toward its second position. An actuator is movable through a control chamber in fluid communication with one end of the piston chamber. The actuator moves between a first position and a second position to drive the piston toward its first position when the actuator moves toward its first position and to be driven by the piston toward its second position when the piston moves toward its second position. Preferably, but not necessarily, the actuator is integral with the piston. A second seal lies between the actuator and the control chamber to create on the actuator a second area larger than the first area against which fluid pressure in the control chamber acts to urge the actuator toward its first position. An inlet to, and an outlet from, the control chamber are in fluid communication with the second area of the actuator to permit the pressure of gas and liquid from the tank to act upon the second area when fed to the control chamber by a dip tube. A vent hole is provided in the control chamber to vent the space between the first and second seals to the atmosphere. The main inlet and the main outlet are arranged on parallel, laterally offset axes to facilitate formation of the part of the main passage leading from the piston chamber to the main outlet.
REFERENCES:
patent: 3363641 (1968-01-01), Mylander
patent: 3502109 (1970-03-01), Straight
patent: 4239058 (1980-12-01), Peters
Continental NH.sub.3 Products Co., Inc., Operation and Service Instructions for SAFE-T-FILL A-3000 Valve.
Auto Stop Corporation
Bell, Jr. Houston S.
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