CMG TECHWIN Co., Ltd. specializes in the manufacture of precise machinery parts to be used for automobiles, ships, industrial machines. The parts are produced by many subcontract companies and are supplied after strict quality inspection and assembly. We have directly exported its products to Japan since 2006. We obtained various qualifications and certificates such as ISO9001, certificate of technology-innovational small and medium enterprise (INNO-BIZ) and etc. As one of the leaders in the field of precise machinery parts, we continuously do our utmost best placing a top priority to customers’ satisfaction. We mainly produce auto-connector assembling parts for industrial equipment, assembling parts for oil/air pressure valves. Major features of double check valve : Opening/Closing is done by the inside shuttle moving left/right, blocking the passage so that the fluid flows in only one direction, and air flow in the opposite direction is prevented.