Fluid handling – Self-proportioning or correlating systems – Self-controlled branched flow systems
Patent
1980-04-11
1982-11-02
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-controlled branched flow systems
91530, 91532, 13759613, F15B 1800
Patent
active
043568351
ABSTRACT:
A hydraulic control valve provides controlled fluid supply for two hydraulic services having different flow and pressure requirements, as for example a lift service of a lift truck for lifting loads vertically and a tilting service for tilting loads forwardly and rearwardly. Two landed spools operate in parallel adjacent bores each joining a plurality of chambers and connected to fluid pressure supply and tank service ports. The supply to port communicating with one of the bores through two of the chambers, so that flow area is increased and the pressure drop of fluid flowing through them is reduced, and is connected through the bore and chambers to the tank port when the respective spool is in a neutral position and selectively to the service ports by movement of the spool. A pressure responsive valve communicates with one supply passage and tank passage and spills fluid from the supply passage to the tank passage in response to a predetermined pressure drop across a restrictor in a fluid supply passage downstream of one of the bores. Preferably the valve includes a piston spring biased and urged by fluid pressure downstream of the restrictor to a valve closed position and having as large an effective area as practicable so that a low pressure differential operates the valve, thereby minimizing power loss through the restrictor.
REFERENCES:
patent: 2869567 (1959-01-01), Carlson
patent: 2988891 (1961-06-01), Hemings
patent: 3077901 (1963-02-01), Klessig
patent: 3162095 (1964-12-01), Koons
patent: 3324881 (1967-06-01), Keir
patent: 3998134 (1976-12-01), Budzich
Pugh Gary W.
Turnbull William S.
Kontak Manufacturing Company Limited
Nilson Robert G.
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