Fluid handling – Systems – Multi-way valve unit
Patent
1982-06-07
1984-10-30
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762564, 13762566, 91464, F15B 13042
Patent
active
044795149
ABSTRACT:
A float positioning assembly for servo actuated proportional control valves which increases the percentage of available pilot pressure for use during normal "raise" and "lower" modes of operation thereby saving energy. The float positioning assembly is connected to one end of a proportional control valve housing in axial alignment with a slidable valve spool. It includes a differential piston which is positioned between a centering spring assembly and an end member. The centering spring assembly includes a support member which is fixed at one end to the axially slidable control valve spool. A centering spring surrounds the support member, and it is mounted between a fixed collar and a slidable collar. When the valve spool is displaced for a "lower" mode of operation, the support member slidably moves through the slidable collar, and the centering spring is slightly compressed between the fixed and slidable collars. During such displacement, the differential piston remains in engagement with an annular abutment in the housing for the float positioning assembly. When the control valve spool is moved from the "lower" position to a "float" position, the differential piston is moved by the centering spring assembly against the end member of the float positioning assembly. There is no significant change in the differential pressure required to move the control valve spool between the "lower" position and the "float" position because the centering spring is merely carried along with the displaced centering spring assembly and differential piston. Thus, the float positioning assembly permits a relatively large percentage of available pilot pressure be used for proportional control in the normal "raise" and "lower" modes of operation.
REFERENCES:
patent: 2949097 (1960-08-01), Vander Kaay
patent: 4011891 (1977-03-01), Knutson et al.
patent: 4024798 (1977-05-01), Schexnayder et al.
patent: 4182534 (1980-01-01), Snyder
patent: 4355660 (1982-10-01), Huffman
Fox John C.
J. I. Case Company
Michalsky Gerald A.
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