Closed center programmed valve system with load sense

Details Closed center programmed valve system with load sense Closed center programmed valve system with load sense

1981-06-01

1983-08-30

Schwadron, Martin P.

Motors: expansible chamber type

Fluid supply through diverse paths to single expansible chamber

Second path activated in response to pressure or flow in...

91 31, 91446, 91449, 91452, 91454, 60452, F15B 13043

Patent

active

044010095

ABSTRACT:
A closed center programmed valve system having a load sense fluid source for control of the raising and lowering of load means by a raise and a lower normally closed two stage valve assembly. Each of the second stages of the valve assemblies has a poppet with a parabolic contour which is dimensioned to provide substantially linear flow rate change for minimized shock when the respective valve is actuated to the valve closed state. The load sense for the load means is taken from the outlet of the raise second stage without the requirement of a separate actuated valve or land with a load sense signal being applied to the fluid source during the time the raise valve assembly is actuated to the valve open state.

REFERENCES:
patent: 3170376 (1965-02-01), Cudnohufsky
patent: 3494258 (1970-02-01), Harms et al.
patent: 3754400 (1973-08-01), Parquet
patent: 3979908 (1976-09-01), Alderson
patent: 4065922 (1978-01-01), Ott et al.
patent: 4116001 (1978-09-01), Orth
patent: 4196588 (1980-04-01), Johnson

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