Valve and Valve ventilation mechanism by intake and exhaust valves, valve actuator, camshaft and camshaft drive mechanism. An air intake and exhaust system filters, into the exhaust pipe and the muffler composition, as well as for the turbocharged diesel engine turbochargers and air coolers, their role is in accordance with the duty cycle of the diesel engine needs to periodically clean the inside of the cylinder adequate supply Fresh air MAN21 / 31, and sent the cylinder exhaust gas after combustion. Structural features of modern large-scale low-speed marine diesel engines: 1, using a long stroke or long stroke; 2, using constant pressure turbocharging system and a high-efficiency exhaust gas turbocharger; 3, increasing the compression ratio, increasing the maximum explosion pressure Pz; 4, combustor components commonly used in drilling cooling technology; 5, using a rotary exhaust valve and hydraulic valve actuator; 6, using variable injection timing mechanism ---- VIT; 7, the use of thin wall bearing; 8, an additional damper on the crankshaft axis; 9, welded crank; 10, shaft generator ---- PTO; in China, we have sold 600 units imported engines MAN21 / 31 diesel engine, successfully authorized for 16 MAN medium and low speed diesel engine factory support for hundreds of the ship to complete uninterrupted service. Atlas MAN newbuilding complementary advantages: 1 Atlas to provide users with the best supporting Option 2, other devices can enjoy a discount agreement 3, MAN factory will provide technical assistance MAN21 / 31 high-quality, on the propulsion system Recommendation 4 adjustment programs, offers free support Mill Supervisor after signing the contract until the delivery of the ship 5, enjoy 113 service centers worldwide. 6, parts prices and enjoy 70% discount marine propulsion engines MAN marine engines division: Supply German imports MAN 8L21 / 31,1720kW (2340bhp), 900/1000 turn concern MAN9L21 / 31 diesel in Shaanxi Diesel Engine Heavy Industry Co., Ltd. successfully developed, the first four diesel generator sets using this loading has been successfully MAN21 / 31 manufacturers, MAN21 / 31, Atlas provided by engineatlasllc. engineatlasllc (www.engineatlas.com) strong, credible, Qinhuangdao in Hebei ship and accessories industry has accumulated a large number of loyal customers. The company better work attitude and continuous improvement and innovative ideas will lead engineatlasllc you hand into the brilliant, for a better future!