Apparatus and method for regulating the rate of change of flow o

Details Apparatus and method for regulating the rate of change of flow o Apparatus and method for regulating the rate of change of flow o

1985-12-31

1987-07-28

Ostrager, Allen M.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

91448, 91468, 1375145, 251 51, 251 52, F15B 1108, F15B 1304

Patent

active

046825312

ABSTRACT:
A control valve for limiting the flow rate of a fluidized medium to a hydraulic motor during start up of the motor so as not to induce loads which exceed predetermined torque limits of apparatus driven by the motor. The control valve includes a poppet which is spring biased to a seated closed position. Increasing inlet-to-outlet pressure differential unseats the poppet in a downstream direction uncovering bypass ports which allow an initial surge of fluid to the motor to accelerate the motor to a predetermined speed at a rate which does not exceed the torque limits. Further downstream movement of the poppet exposes greater cross-sectional areas of main inlet ports which permit additional modulated fluid flow to accelerate the motor to its operational speed. The rate of movement of the poppet in the downstream direction is limited by flow restrictor orifices which conduct fluid which is displaced from a chamber due to the downstream movement of the poppet. Rapid resetting of the poppet is effected by the spring bias in conjunction with the return flow of fluid into the chamber via a path which bypasses the flow restrictor orifices.

REFERENCES:
patent: 2659384 (1953-11-01), Lowe
patent: 3107688 (1963-10-01), Caslow
patent: 3605802 (1971-09-01), Hertell
patent: 3735777 (1973-05-01), Katzer et al.

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