Fluid handling – With lock or seal – Common lock and valve actuator
Patent
1980-11-26
1983-09-06
Chambers, A. Michael
Fluid handling
With lock or seal
Common lock and valve actuator
70176, 70179, 60494, F16K 3506
Patent
active
044023391
ABSTRACT:
A lockable valve in a hydraulic system comprising a valve body, a cylinder, a piston in the cylinder, and an inlet port and two outlet ports, one of the outlet ports leading to a bypass line and the other of the outlet ports leading to an operational hydraulic cylinder; the piston being slidable in the cylinder to selectively close either of the outlet ports. The valve includes a manually lockable means to lock the piston in the position in which the outlet port to the hydraulic cylinder is closed and being spring biased to close the outlet port leading to the bypass line and simultaneously to open the outlet port leading to the hydraulic cylinder when the lockable means is unlocked. An additional safeguard against the theft of vehicles employing hydraulic systems to power auxiliary equipment is provided by using this valve in the hydraulic line between the pressure side of the pump and the control valve of the auxiliary equipment.
REFERENCES:
patent: 2845943 (1958-08-01), Perkins
patent: 3401545 (1908-09-01), Fraser
patent: 3580623 (1971-05-01), Peters
patent: 3771547 (1973-11-01), Coleman
patent: 3987627 (1976-10-01), Lindstrom
Chambers A. Michael
Yeager Arthur G.
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