HYDRAULIC LIFT CONTROL SYSTEM

摘要

The present invention ensures that an element (13) that prevents falling of the load by entrapment of the hydraulic fluid within a hydraulic cylinder also functions as discharging the entrapped hydraulic fluid in order to assure the lowering operation at the same time. As the said novelty in the system shall also function as the load retainer check valve, it is possible to achieve very low leak rates without employing any lowering valve or system or without reducing the diametric gap between the spool and the body.