Valves

Details Valves Valves

1998-02-03

1999-09-14

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91447, F15B 13042

Patent

active

059506733

ABSTRACT:
A pilot operated check valve is provided for use in controlling the hydraulic leg 14 of a hydraulic mine roof support, the valve having means 23 to connect a leg extension port 18 to a return port 17 within the valve, when the valve is used to lower the leg 14. This provides more rapid operation than with prior art arrangements in which released pressure from the leg has to return from an extension port back to a remote spool valve controlling leg extension before reaching a return line.

REFERENCES:
patent: 4624455 (1986-11-01), Putnam
patent: 5400816 (1995-03-01), Gerstenberger
patent: 5738142 (1998-04-01), Eike et al.

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