Lower and float capability in four position control valve

Details Lower and float capability in four position control valve Lower and float capability in four position control valve

1998-07-21

1999-11-30

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91447, F15B 1304

Patent

active

059924543

ABSTRACT:
A spool valve assembly (11) including a valve spool (33) defining a Raise position (R) operable to provide fluid communication from an inlet port (21) to a work port (25), and a Neutral position (N) blocking such flow. The spool valve (33) has a Lower position (L) in which return flow from the work port (25) flows past a pilot operated check valve (77) is then metered by a metering notch (75) defined by the valve spool. The valve spool (33) also has a separate Float position (F) in which the inlet port (21), the work port (25) and the return port (23) are interconnected. In the Float position (F), fluid at the valve spool (33) is in communication with the return port (23) through a back-pressure valve (59), which may be manually adjusted to control the back-pressure on a work implement (15) as it is permitted to "float".

REFERENCES:
patent: 2949097 (1960-08-01), Vander Kaay
patent: 3613508 (1971-10-01), Krehbiel et al.
patent: 3746040 (1973-07-01), Paul
patent: 4088151 (1978-05-01), Schurger
patent: 4290447 (1981-09-01), Knutson
patent: 4569273 (1986-02-01), Anderson et al.
patent: 4782859 (1988-11-01), Constantinian

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