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US 3,942,553 AGranted
Digital fluid flow control system with trim adjustment
AssigneeProcess Systems, Inc.
InventorRobert A. Gallatin
Life of this patent
Estimating the term…
Abstract
Individually actuatable digital valve elements in parallel interconnect a fluid source to a receiver. In the flow passage of each valve element, there is a converging-diverging nozzle that feeds into the receiver. A trim adjustment screw is movable along the axis of each nozzle to vary the effective cross-sectional area of such nozzle. The nozzle and screw are part of an insert that can be mounted in the valve body after individual calibration.
Claims19
A digital fluid flow control system comprising:
- an upstream manifold;
- a downstream manifold;
- and
- a plurality of individually actuatable, digital valve elements each having a fluid flow passage interconnecting the manifolds, a converging-diverging nozzle having an axis along the flow passage, a slug movable along the axis to disrupt the flow through the nozzle, a bistable plug, and means for positioning the plug exclusively in an open position or a closed position, the plug preventing fluid flow through the passage in the closed position and permitting fluid flow through the passage in the open position.
1 more element
A fluid flow control system having:
- a source of fluid at a first pressure;
- a fluid receiver at a second pressure lower than the first pressure;
- and
- a plurality of individually actuatable, digital valve elements each having a fluid flow passage interconnecting the source to the receiver, a nozzle having a converging section in the flow passage, a diverging section in the flow passage, and a throat between the converging and diverging sections, a bistable plug, and means for positioning the plug exclusively in an open position or a closed position, the plug preventing fluid flow through the passage in the closed position and permitting fluid flow through the passage in the open position, the difference between the first and second pressures being sufficiently high that the pressure at the throat of the nozzle is independent of the second pressure;
- the improvement comprising means for adjusting the effective orifice areas of the respective nozzles.
2 more elements
Dependencies are inferred from the claim text.