Motors: expansible chamber type – Working member position feedback to motive fluid control – Fluid operated
Patent
1976-09-03
1979-05-08
Maslousky, Paul E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Fluid operated
91402, 91461, 1376256, F15B 1316, F15B 1522
Patent
active
041529715
ABSTRACT:
Two fluid passages are connected through flow restrictors to a fluid supply. Downstream of the restrictors the fluid supply has a drooping pressure-load characteristic. Venting means for the fluid passages comprises vent openings therein downstream of the restrictors and variable position obstructor means cooperating with vent openings to vary venting and thereby vary fluid pressures in the fluid passages.
Fluid conduits connect these pressure outputs to a fluid to mechanical translator comprising a double acting piston moving in a cylinder whose opposite ends are connected to the fluid conduits. The piston and cylinder form the responder of the system, which may be adjacent the mechanical to fluidic translator and form part of the transmitter.
A feed back means controlled by the position of the responder piston and/or the load varies pressure in the fluid conduits by variably venting same.
Instead of variable venting, variable pressures can be generated by making the restrictors variable and conducting the downstream pressure by two lines to the responder. Furthermore, the transmitter may be modified to effect change in only one pressure. A single line may then be used between transmitter and responder.
REFERENCES:
patent: 2709421 (1955-05-01), Avery
patent: 2841168 (1958-07-01), Levetus et al.
patent: 3426258 (1969-02-01), Van Pelt
patent: 3521535 (1970-07-01), Pelrich
patent: 3543648 (1970-12-01), Stahle
Conley Ned L.
Maslousky Paul E.
Robinson Murray
Weaver Russell D.
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