HYDRAULIC CIRCUIT FOR MINIMIZING NATURAL DROP OF BOOM CYLINDER OF SKID LOADER EQUIPMENT

摘要

PURPOSE: A hydraulic circuit is provided to prevent the natural drop of a boom cylinder by applying a safety valve preventing drop of boom in neutrality of a control valve regardless of turning on/off of starting. CONSTITUTION: The hydraulic circuit for minimizing the natural drop of a boom cylinder of skid loader equipment contains a control valve(12) connected to a pump(10), a boom cylinder(16) connected to a spool of the control valve(12), and a solenoid type safety valve preventing drop of a boom(18) installed between the control valve(12) and the boom cylinder(16). A pilot type safety valve(18) preventing the drop of the boom comprises a control valve connecting port installed between the control valve(12) and a boom cylinder base, a poppet connected to one side of the control valve connecting port, springs installed on both sides of the poppet, a boom cylinder base connecting port installed on the upper part of the poppet, and a boom cylinder rod connecting port installed on the lower part of the poppet.