Two-stage externally adjustable control valve

Details Two-stage externally adjustable control valve Two-stage externally adjustable control valve

1994-05-31

1995-10-17

Look, Edward K.

Motors: expansible chamber type

Plural relatively movable or rigidly interconnected working...

Condition responsive means for modifying working member...

91517, 91518, 91461, F15B 1100, F15B 1300

Patent

active

054580498

ABSTRACT:
Material such as trash or refuse is packed in a container by opposed hydraulic packing and ejecting cylinders. Each cylinder is controlled by a hydraulic control valve with the control valve controlling the ejecting cylinder being, in effect, operated by the control valve for the packing cylinder. This is accomplished by sensing the pressure applied to the packing cylinder and when the pressure reaches a predetermined level, a pilot dump valve, in the ejecting cylinder is opened to allow the piston in the ejecting cylinder to retreat. When the pilot pressure drops below the predetermined level, the pilot dump valve closes, allowing the packing cylinder to exert additional packing force. In this way the piston in the ejecting cylinder inches back and the material is intermittently packed. An anti-cavitation check is provided so as to fill the chamber of the ejecting cylinder as the piston retracts.

REFERENCES:
patent: 2812055 (1957-11-01), Wenger
patent: 2954011 (1960-09-01), Krehbiel
patent: 2981287 (1961-04-01), Caslow
patent: 3304953 (1967-02-01), Wickline et al.
patent: 3340897 (1967-09-01), Nevulis
patent: 3502109 (1970-03-01), Striaght
patent: 3765181 (1973-10-01), Lang et al.
patent: 4253382 (1981-03-01), Yip
patent: 4588163 (1986-05-01), Christensen
patent: 5036750 (1991-08-01), Katayama

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