Proportional Valve (JL30)

 As an upgraded version of the JL36 valve block, the JL30 improves hydraulic elevator control precision. Its proportional valve with analog  control enables true stepless speed adjustment, upgrading hydraulic control from stepped to stepless operation for enhanced smoothness.  With a built-in pressure-compensated throttle valve, the proportional valve automatically adapts to load changes, maintains stable acceleration  and deceleration, eliminates speed fluctuations, and ensures elevator safety and ride comfort. The optimized manual emergency device, featuring a self-resetting structure, simplifies operating procedures, making emergency rescue  more convenient and efficient while enhancing the equipment's emergency response capability.

Ascend 

The elevator ascending speed is adjusted by the VFD which controlled  by PLC, that means the VFD drives the motor and oil pump. 

• After start-up, the elevator accelerates upward.  

• When reaching the preset deceleration position, the PLC  commands the VFD reduce its output frequency to 20–25 Hz for the  deceleration.  

• When the elevator arriving at the leveling position, the PLC controls  the VFD to stop, enabling the elevator to stop accurately

Descend

The elevator descending speed is adjusted by the fast and slow  pilot throttle valves. 

Upon receiving the descending signal, both the fast and slow  solenoid valves are energized, two pilot throttle valves open,  meanwhile the elevator starts to accelerate downward  smoothly.When it reaches the preset deceleration position, the fast  solenoid valve de-energizes and the fast pilot throttle valve closes  gradually, meanwhile the elevator descending slowly.When the  elevator arriving at the leveling position, the slow solenoid valve  de-energizes and the slow pilot throttle valve closes, enabling the  elevator to stop accurately.