Pinch valve control circuit

Details Pinch valve control circuit Pinch valve control circuit

1977-03-11

1979-01-23

Schwadron, Martin P.

Fluid handling

Systems

With pump

137846, 222 55, 251 5, 251 24, 251 25, 251118, 417295, F16K 707

Patent

active

041355504

ABSTRACT:
A control circuit is disclosed for a sleeve-type pinch valve and which control circuit utilizes an internal vacuum condition in a main supply line in which the valve is disposed to retain the elastomeric sleeve of the valve open. A check valve is provided in the control circuit to prevent backflow of material from the main supply line into the control circuit and pinch valve. A unique check valve disclosed for this purpose includes an expandable tubular diaphragm of elastomeric material normally closed at one end and which opens cylindrically so as to impose no restriction to one-way flow of material therethrough. The one end collapses when flow is interrupted, thus to prevent backflow through the valve.

REFERENCES:
patent: 615751 (1898-12-01), Sands
patent: 3007416 (1961-11-01), Childs
patent: 3669142 (1972-06-01), Gerbic

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