Valves and valve actuation – Tube compressors – Fluid pressure actuated
Patent
1980-03-17
1985-04-16
Schwadron, Martin P.
Valves and valve actuation
Tube compressors
Fluid pressure actuated
251 28, 137 85, F16L 5514, F16K 31126
Patent
active
045111162
ABSTRACT:
A pinch sleeve valve having controllable opening positions regardless of internal sleeve pressure is disclosed. In the past it has not been possible to use a pinch sleeve valve as a control valve because a variation in pressure within the sleeve has affected the opening of the sleeve. The present valve comprises a flexible sleeve with a passageway therethrough, the sleeve having variable positions from a round cross section when fully open, to a collapsed cross section when closed. A rigid pressure sealed housing contains the sleeve and a sensing probe is connected to the sleeve which senses whether the sleeve is fully open, partially open or closed. A valve positioner is connected to the sensing probe and has a control system to set opening positions of the valve regardless of variations in the internal sleeve pressure, the valve positioner controls supply fluid to the housing at a pressure higher than the internal sleeve pressure and sufficiently high to close the sleeve to the desired opening position.
REFERENCES:
patent: 2993498 (1961-07-01), Brand
patent: 3485472 (1969-12-01), Bozich
patent: 4143850 (1979-03-01), Brakebill
Publication Re Conoflow, Model J Positioner, Published 4/1/66 by Conoflow, pp. 1-2, 5-8.
Publication Re Conoflow, Commandaire Model 31 Positioner, Published 10/1973, pp. 1-4.
Publication Re Moore Built-In Positioners, Published 6/1966, pp. 1-2.
Linatex Canada Inc.
Schwadron Martin P.
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