Power transmission

Details Power transmission Power transmission

1976-11-12

1978-07-11

Schwadron, Martin P.

Fluid handling

Systems

Supply and exhaust

1375962, F15B 1308, F15B 1304

Patent

active

040995410

ABSTRACT:
A directional valve assembly for use in hydraulic power systems such as are used on fork lift trucks has a plurality of sliding spool directional valves and a balanced relief valve mounted in the body formed of a plurality of sections bolted and gasketed together. The main lift section has a load-holding check valve of special design together with means on the spool for opening the check valve to lower the load. Means are provided in the assembly for preventing interflow from one valve spool to another when two or more spools are simultaneously shifted. This includes a system of restrictors, check valves and passages causing the main relief valve to act as a pressure compensator responsive to the pressure requirement of the smallest load.

REFERENCES:
patent: 3160167 (1964-12-01), Martin
patent: 3815477 (1974-06-01), Ailshie et al.
patent: 3827543 (1974-08-01), Malott et al.
patent: 3841096 (1974-10-01), Koppen et al.

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