Wide angle controller with dual function check valves

Details Wide angle controller with dual function check valves Wide angle controller with dual function check valves

1996-01-18

1997-06-03

Michalsky, Gerald A.

Fluid handling

Systems

Multi-way valve unit

60384, 91467, F15B 1304, F15B 1310

Patent

active

056344953

ABSTRACT:
A fluid controller (17) having a housing (21) and valving including a spool (41) and a follow-up sleeve (43). The spool and sleeve define a central reference plane (RP) with the housing having two annular chambers (61, 62) receiving pressurized fluid from an inlet port (23). One of the annular chambers (61) communicates pressurized fluid to the main flow control orifice (A1) in a left turn, and to the flow amplification orifice (AQ) in a right turn, while the other annular chamber (62) communicates pressurized fluid to the main flow control orifice (A1) in a right turn, and to the flow amplification orifice (AQ) in a left turn. A check valve (103,105) is associated with each of the annular chambers, such that one check valve (103) is an inlet check in a right turn and a reverse flow prevention check while manually steering in a left turn, whereas the other check valve (105) is an inlet check in a left turn and a reverse flow prevention check while manually steering in a right turn. The disclosed arrangement makes it possible to combine wide angle steering architecture with flow amplification capability, without the need to close off the amplification orifice (AQ) during manual steering.

REFERENCES:
patent: 4043419 (1977-08-01), Larson et al.
patent: 4759182 (1988-07-01), Haarstad
patent: 4838314 (1989-06-01), Gage
patent: 5080135 (1992-01-01), Stephenson

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