Dispensing – Automatic control – Constant weight – volume or pressure control by output
Patent
1982-07-30
1984-04-17
Rolla, Joseph J.
Dispensing
Automatic control
Constant weight, volume or pressure control by output
222131, 222212, 222215, 137488, 251 5, B67D 508, F16L 5514
Patent
active
044429541
ABSTRACT:
A self-pressurizing pinch valve is disclosed which is suitable for controlling the flow of liquid in a filling machine for dispensing predetermined quantities of liquid. The pinch valve comprises a flexible hose for conveying the liquid, a chamber defined about at least a portion of the flexible hose, the flexible hose being adapted to be pinched in the chamber for valving the flow of liquid therethrough, and a valve arrangement responsive to movement of the flexible hose for controlling the pressure in the chamber so that it substantially balances the internal pressure in the hose. This valve arrangement includes a check valve which is opened to increase the pressure in the chamber in response to radial expansion of the hose and an outlet which is closed by the flexible hose when the pressure in the chamber is less than or substantially equal to the internal pressure in the hose and opened when the fluid pressure in the chamber is substantially greater than the internal pressure in the hose so as to radially compress the hose.
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Huppert Michael S.
National Instrument Company Inc.
Rolla Joseph J.
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