Hydraulic hoisting circuit with electrical control for relief va

Details Hydraulic hoisting circuit with electrical control for relief va Hydraulic hoisting circuit with electrical control for relief va

1990-02-14

1991-11-26

Look, Edward K.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60427, 60468, 91529, E02F 332, E02F 920, E02F 922, F15B 1102

Patent

active

050673211

ABSTRACT:
A hydraulic circuit for a piece of construction equipment such as a hydraulic shovel. The operation of the hydraulic shovel is controlled by a number of hydraulic actuators which are provided with a high pressure oil through selector valves. A main relief valve prevents an excessive pressure from developing in the vicinity of a main pump, and port relief valves associated with the individual actuators prevent excessive pressures from reaching each actuator. Pilot lines carry a biasing oil pressure from a pilot pump to the main relief valve and to at least one of the port relief valves to boost the relief pressures in the circuit in response to a signal from an operator controlled switch. Simultaneously with effecting a boosting of relief pressure in the relief valves, the operator controlled switch renders one of the actuators inoperative using a shut-off valve so that it may not be operated while the relief pressures are boosted.

REFERENCES:
patent: 4087968 (1978-05-01), Bianchetta
patent: 4218837 (1980-08-01), Peterman
patent: 4317466 (1982-03-01), Ikeda et al.
patent: 4365429 (1982-12-01), Ecker et al.

Affiliated with

Also associated with

Rating

Hydraulic hoisting circuit with electrical control for relief va does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hydraulic hoisting circuit with electrical control for relief va, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic hoisting circuit with electrical control for relief va will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2381397