In large-scale automatic machining center for precision machining oil-free piston compressor Swan, a gripping surface to complete each process to ensure the accuracy of consistency. Yu GB 19153-2009 INTRODUCTION 4.3 and 4.4 of this standard is mandatory terms, and the rest is recommended. This standard replaces GB 19153 2003 "displacement air compressor energy efficiency of limited value and energy conservation evaluation values." This standard, compared with 191,532,003 GB main changes are as follows: - the standard name from the "displacement air compressor energy efficiency and energy conservation evaluation values ??limited value" to "displacement air compressor energy efficiency of limited value and energy efficiency rating"; - Increased the energy efficiency rating and target energy efficiency of limited value; - range increases generally with a single injection screw air compressors. This standard by the National Standardization Technical Committee for Energy and management proposed. Oil-free piston compressor Swan, Xingchang compressor (certified), Swan brand air compressor provided by Xingchang Pneumatic Machinery Co., Ltd. Qingdao. Qingdao Xingchang Pneumatic Machinery Co., Ltd. (www.xckyj.com) is a leader in Qingdao, Shandong, industry-specific equipment, over the years, the company is implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. In Xingchang Pneumatic Machinery leadership with the staff warmly welcome all inquiries negotiations to create Xingchang Pneumatic Machinery a better future.