液压升降平台http://www.sjpt178.com/防跌落装置还包括单向节流阀，右腔与单向节流阀的一端相连接，单向节流阀的另一端与储液压缸相连接，液压油自右腔流向储液压缸时单向节流阀关闭，液压油自储液压缸流向右腔时单向节流阀打开。
Hydraulic elevator goods ladder anti dropping device also comprises a one-way throttle valve, right cavity and a one-way throttle valve is connected to one end, one-way throttle valve and the other end of reservoir hydraulic cylinder is connected, hydraulic oil since the right cavity flow to the storage of hydraulic cylinder when the one-way throttle valve is closed, hydraulic oil from reservoir hydraulic cylinder flows into the right cavity when the one-way throttle valve is opened. 

液压升降平台上升时，液压油既可经电磁阀流向右腔，也可经单向节流阀流向右腔，减小阻力，从而减小升降机上升时的功耗。
When the hydraulic lifting goods ladder is increased, the hydraulic oil can flow through the electromagnetic valve to the right cavity, and the hydraulic oil can flow to the right cavity through a one-way throttle valve to reduce the

resistance, thereby reducing the power consumption of the elevator. 

液压升降平台http://www.sjpt178.com/下降时，液压油不能经过单向节流阀，只能经过电磁阀，液压升降机突然失电时防跌落装置才能有效制动升降机下降。
Hydraulic lift cargo ladder down, the hydraulic oil can not be a one-way throttle valve, can only pass through the solenoid valve, hydraulic lift suddenly lost power when the anti fall device can effectively brake lift down.