Pilot operated stepping directional valve and method for single

Details Pilot operated stepping directional valve and method for single Pilot operated stepping directional valve and method for single

1987-12-24

1989-03-21

Massie, IV, Jerome W.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Adjustable head

91189R, 91426, 91433, 251 58, 251230, E21C 2724, F16K 31122, F16K 3154

Patent

active

048137499

ABSTRACT:
A piloted rotary two-way "on-off" valve which will couple hydraulic fluid from the valve input to the valve output in the "on" position and then move to the "off" position where it will maintain the pressure on the down stream side while enabling the pressure on the upstream side to be removed.

REFERENCES:
patent: 2171579 (1939-09-01), Loughbridge
patent: 3617093 (1971-11-01), Daily
patent: 3650506 (1972-03-01), Bruton
patent: 3712679 (1973-01-01), Amoroso
patent: 4260128 (1981-04-01), Tito
patent: 4318332 (1982-03-01), Shingu
patent: 4647003 (1987-03-01), Hilpert et al.

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