Fluidic Absolute-to-Differential Pressure Converter.
DEPARTMENT OF THE ARMY WASHINGTON DC
Pagination or Media Count:
A method and apparatus for converting the absolute pressure of a pressurized fluid to a differential pressure indicating the fluid pressure relative to a reference pressure The pressurized fluid is directed asymmetrically into a laminar proportional amplifier LPA along a centerline toward a first of two outlets at a velocity determined by the fluid pressure. The LPA includes first and second control inlets disposed on opposite sides of the directed fluid jet and connected to a common source of control fluid, the first control inlet being disposed on the same side as the first outlet, and the second control inlet being disposed on the same side as the second outlet. The first and second control inlets include respective first and second downstream control edges which are asymmetrically disposed on opposite sides of the jet, with the second control edge being disposed closer than the first control edge to the centerline consequently, the jet is deflected towards the second outlet in accordance with the jet velocity such that the differential pressure generated by the jet between the first and second outlets is zero when the fluid pressure is equal to the reference pressure. Author
- Fluidics and Fluerics