Hydraulic elevator control valve

Details Hydraulic elevator control valve Hydraulic elevator control valve

1991-05-16

1993-05-25

Look, Edward K.

Power plants

Pressure fluid source and motor

Ram driven by fluid pumped from reservoir

91449, 91459, 187110, 187 292, F16D 3102, F15B 13044

Patent

active

052129519

ABSTRACT:
According to the invention, a valve for use with a variable speed motor and pump in an hydraulic elevator balances a fluid pressure force on a pump side of a control valve with a fluid pressure force on a cylinder side of the control valve before an elevator cab moves either upwardly or downwardly. On the pump side of the valve, a separate circuit, which is controlled by a solenoid, directs the pump fluid pressure force behind the valve until the sum of the fluid pressure acting on the pump side of the control valve overcomes the fluid pressure on the cylinder side of the control valve to open the valve.

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patent: 5014823 (1991-05-01), Pelto-Huikko
patent: 5014824 (1991-05-01), Fargo

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