The fourth chapter industry supply analysis 4.1. 4.1.1.2007-2012 domestic supply air compressor production in China and the growth of China's air compressor 4.1.2.2007-2012 productivity and growth 4.1.3.2012-2016 air compressor production in China and growth forecast 4.2. Air compressor inlet supply 4.2.1.2009-2011 imports value and growth 4.2.2. Imported products in the domestic market accounted for 4.2.3. The main imported brands and product features 4.2.4.2012-2014 Air Compressor products import value and growth forecast 4.3. Regional supply analysis 4.3.1. Industry cluster status 4.3.2. Air compressor 4.3.3 regional distribution companies. Key provinces and cities air compressor industry characteristics 4.3.4. Air compressor output and key provinces accounted for 4.4. 4.4.1 industry supply and demand balance. Air compressor industry supply and demand balance summary (quantity and quality) 4.4.2. Factors affecting the supply and demand balance of the air compressor industry 4.4.3. Air compressor industry trends demand balance piston air compressor displacement compressors - directly depend on changes in gas volume to increase gas pressure compressor. Piston compressors - are positive displacement compressors, compression element is a piston Shandong screw air compressor, reciprocating motion within the cylinder. Rotary compressor - is a positive displacement compressors, forced movement by rotating element to achieve. Vane compressor - a rotary screw compressor proxy variable capacity compressor, axial vane on the same cylinder block eccentric rotor for radial sliding. After being discharged compressed air trapped slide in between. Liquid - piston compressors - are rotary positive displacement compressor, in which water or other liquid as a piston to compress the gas, and the gas discharge. Roots dual-rotor compressor - belong rotary positive displacement compressor, in which two intermeshing rotors Roots thus the gas stopped, and sent from the air intake vents. No internal compression. Shandong screw compressor, compressor Xingchang (certified), screw 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.