Power plants – Pressure fluid source and motor – Methods of operation
Patent
1994-08-12
1995-10-10
Lopez, F. Daniel
Power plants
Pressure fluid source and motor
Methods of operation
60453, 60494, F16D 3100, F16D 3300
Patent
active
054560780
ABSTRACT:
In all hydraulic systems, it is important to remove all entrained air, dirt and other impurities from the system prior to normal operation. In the subject invention, a method of purging and/or preconditioning a hydraulic system is provided and includes the steps of connecting a shunt line between opposite ends of respective fluid actuators and operating the respective valve mechanisms to force fluid from the source of pressurized fluid through the respective valve mechanisms across the respective shunt lines and back to the reservoir. Likewise, the subject invention provides a method to purge the signal control system of any entrained air, dirt and other impurities. The method also provides an easy process of "warming up" the system or totally replacing all of the fluid in the system with another type of fluid, such as fluid for arctic conditions. The method of purging the signal control system includes selectively connecting a bypass line between the reservoir and the signal control system. The above method provides an efficient and simple way to purge a hydraulic system of entrapped air, dirt and other impurities.
REFERENCES:
patent: 3154087 (1964-10-01), Beaver
patent: 3157478 (1964-11-01), Edwards
patent: 3943717 (1976-03-01), Schexnayder
patent: 4059042 (1977-11-01), Bridwell et al.
patent: 4141216 (1979-02-01), Engel
patent: 4685293 (1987-08-01), McBeth
patent: 4990111 (1991-02-01), Saitoh et al.
Burrows J. W.
Caterpillar Inc.
Lopez F. Daniel
Nguyen Hoang
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