REGENERATION HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINERY

摘要

PURPOSE: A regeneration circuit for construction machinery is provided to simply manufacture an arm control valve and the regeneration circuit by additionally using a regeneration connection line aside from a spool of the arm control valve. CONSTITUTION: A regeneration circuit for construction machinery comprises a parallel line(320), an exhaust line(340), a regeneration connection line(350), and a check valve(500). The parallel line connects a supply port(310) of an arm control valve to a hydraulic pump(100). The exhaust line connects an exhaust port(330) of the arm control valve to a tank(400). The regeneration connection line connects the parallel line and the exhaust line and regenerates hydraulic fluid by supplying a part of the hydraulic fluid exhausted from the exhaust line to the parallel line. The check valve is installed in the regeneration connection line and prevents the hydraulic fluid from backward flowing to the exhaust line.