Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1993-05-13
1994-08-09
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
60469, 60466, 91451, F16D 3102
Patent
active
053354958
ABSTRACT:
Described herein is a brake valve which is arranged to prevent low pressure relief actions by relief valves (59A) and (59B) at the time of starting an actuator, for improving the response characteristics and the safety of operation. This brake valve has relief valves (59A) and (59B) and check valves (70A) and (70B) located in coaxial positions, the check valves (70A) and (70B) being arranged to seat on fore end portions of valve seat members (62A) and (62B) when opened, thereby to substantially block the communication of the valve seat members (62A) and (62B) with inlet link passages (56A) and (56B). Therefore, when the check valve (70A) or (70B) is opened at the time of starting the actuator, the valve seat member (62A) or (62B) is supplied with only a throttled flow of hydraulic pressure through the notched portions (73A) or (73B). As a result, the hydraulic pressure from a hydraulic pump is quickly supplied to the hydraulic motor through charging/discharging passages (9) and (10) without entailing pressure drops.
Kanno Yukio
Sato Hitoshi
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
Lopez F. Daniel
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