Fluid controller and improved backflow prevention therefor

Details Fluid controller and improved backflow prevention therefor Fluid controller and improved backflow prevention therefor

1995-03-17

1997-04-15

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

60384, 91467, 91516, 137516, F15B 1306

Patent

active

056200269

ABSTRACT:
A fluid controller (17) is disclosed of the type including a relatively rotatable valve spool (95) and valve sleeve (97) which define a series of variable control orifices (71-76) during normal steering operations. Fluid flow to a control port (27) is controlled by a variable control orifice (74). During small steering corrections, at relatively small valve displacements, the present invention provides an additional variable control orifice (155), which opens before the control orifice (74) opens. A form of check valve (153) is in series with the additional orifice (155), and downstream thereof, to prevent reverse flow from the control port (27) through the controller. The invention is especially beneficial in controllers of the dynamic load signal type including a load signal drain orifice (76) which is open to the system reservoir (R) at the relatively small displacements.

REFERENCES:
patent: 3804119 (1974-04-01), Christensen
patent: 4052929 (1977-10-01), Baatrup
patent: 4505110 (1985-03-01), Smith
patent: 4620416 (1986-11-01), Yip et al.
patent: 4759182 (1988-07-01), Haarstad

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