It is one of the most complex compressor parts, Qingdao swan air compressor, air cylinder forms, swan air compressor, complex structure. Low pressure compressor cylinders are made of small and medium wear resistance, high strength cast iron. B) Moisture: The compressor 1. Anhydrous sulfate steel tube (white powder) fitted into the compressor oil, such as copper sulfate from white to blue, which can also prove that the oil in the presence of moisture. Swan Air Compressor Qingdao | Xingchang Pneumatic Machinery (certified) | Swan air compressor provided by Qingdao Xingchang Pneumatic Machinery Co., Ltd. Qingdao Xingchang Pneumatic Machinery Co., Ltd. (www.xckyj.com) is the leader in Qingdao, 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 better future.