Fluid handling – Systems – Multi-way valve unit
Patent
1978-02-21
1980-01-29
Michalsky, Gerald A.
Fluid handling
Systems
Multi-way valve unit
13762563, 13762566, 251297, F15B 13043
Patent
active
041856600
ABSTRACT:
A cylindrical valve spool is slidably positioned in a chamber of a valve housing having a plurality of fluid inlet ports and a plurality of fluid outlet ports. The valve spool is movable to a selected one of a plurality of positions to interconnect a selected inlet port with a selected output port. A detent apparatus is associated with one end of the valve spool and is operable to lock the valve spool in one of three positions in the chamber. A remotely operated first pilot valve is operable to convey pressurized fluid to either end of the valve spool and thereby shift the valve spool to either a first or second end position for interconnecting selected inlet and outlet ports. A centering device is operable to shift the valve spool from either detented end position to a detented center or neutral position by deactivating the pilot valve and simultaneously conveying pressurized fluid from a second pilot valve to the centering apparatus. The centering apparatus includes a pair of pistons movably positioned in a fluid chamber arranged to receive pressurized fluid. The pistons have a limited stroke between a retracted position and an extended position. The fluid chambers are pressurized by activating the second pilot valve and deactivating the first pilot valve. This moves the pistons to the extended position and pivots a shifting lever connected to the valve spool to move the valve spool from either end position to the center position in the valve chamber. The detent apparatus locks the valve spool in the neutral position until the valve spool is shifted to another position by operation of the first pilot valve.
REFERENCES:
patent: 2725077 (1955-11-01), Nicholl
patent: 3511276 (1970-05-01), Jessen et al.
patent: 3640146 (1972-02-01), Barnes
patent: 4041983 (1977-08-01), Bianchetta
patent: 4046165 (1977-09-01), Rose et al.
Adams John M.
Consolidation Coal Company
Michalsky Gerald A.
Mikesell, Jr. William A.
Price, Jr,. Stanley J.
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