Fluid handling – Line condition change responsive valves – With separate connected fluid reactor surface
Patent
1987-05-04
1988-01-05
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
With separate connected fluid reactor surface
91443, 91447, G05D 1610
Patent
active
047169290
ABSTRACT:
A pressure compensated flow control valve (10) embodying the concepts of the present invention is particularly suited for use as a component within the hydraulic system of a fork lift truck (11) in order to permit an unrestricted flow of fluid therethrough to raise the forks (18), either with or without a load (19), and to control the flow of fluid therethrough in order to govern the speed at which the forks (18) lower a load (19). During the lowering of the load (19) the valve (10) is properly responsive to actual, apparent and/or transient loading changes. The valve (10) employs a spool (95) slidable within a cavity (75). The spool (95) has a piston portion (96), and a sleeve (135) is slidably mounted on the skirt (125) of the piston (96). The translation of the piston (96) relative to the cavity (75), and the translation of the sleeve (135) relative to the piston (96) effects opening and closing of the ports (156) required to effect control of the fluid flowing between a distribution chamber (155) in the valve (10) and the load lifting/lowering cylinder (20). Axial translation of the piston (96) and the sleeve (135) is effected in response to fluid pressure and/or fluid flow experienced at the valve (10), and hydraulic biasing means (106,115), acting in concert with mechanical biasing means (161,162), are provided selectively to assist, or resist, translation of the spool (95).
REFERENCES:
patent: 3414007 (1968-12-01), DeMarco
patent: 3420146 (1969-01-01), McPherson
patent: 3421545 (1969-01-01), DeMarco
patent: 3433253 (1969-03-01), Tomer
patent: 4132153 (1979-01-01), Grotness
patent: 4601366 (1986-07-01), Blain
B. W. Rogers Company
Nilson Robert G.
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