Pumps – Motor driven – Fluid motor
Patent
1987-08-10
1988-10-11
Look, Edward K.
Pumps
Motor driven
Fluid motor
91308, 91313, 91350, 137106, 13762414, 417403, F04B 908, F15B 908
Patent
active
047767731
ABSTRACT:
A pilot control valve comprising an elongated valve member shiftable within a valve body between a first and a second position. The first position allows communication of control fluid to a first pressure receiving surface to initiate movement of the valve member from its first position to a position equalizing the pressure acting on a second pressure receiving surface with the pressure of the control fluid, thereby causing the valve member to move to its second position. The valve member when in its second position allows communication with a third pressure receiving surface for initially moving the valve member from its second position while equalizing the pressure acting on the second pressure receiving surface to move the valve member to a position equalizing the pressure acting on the second pressure receiving surface with a pressure lower than the pressure of the control fluid for moving the valve member to its first position whereby the operation is repeated at infinitum.
REFERENCES:
patent: 3374713 (1968-03-01), Broughton
patent: 4593712 (1986-06-01), Quartana, III
Bode George A.
Look Edward K.
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