Cottle Screw Compressors major group are the following systems: air flow system, lubricating oil flow systems, cooling systems, security systems, control systems and electrical wiring. Cottle · Screw Compressors group mainly compressor, motor, air filter, intake valves, oil barrels, air coolers, oil coolers pressure switch, one-way valves, cylinders, pressure gauge , automatic drainage, safety valves and other equipment components. Also in the air compressor system configuration mostly cold and dry and the air dryer. Volumetric efficiency is the actual volume of gas and theoretical volume ratio of the compressor air compressor repair, expressed as a percentage. Compression efficiency is to give power to the theoretical power compression ratio required for quantitative real gas. Theoretical power can be isothermal adiabatic conditions or conditions to calculate. The corresponding percentages are available to determine the compression efficiency and representation. On steam drive or internal combustion engine driven compressors, mechanical efficiency is the ratio of the brake-horsepower compressor horsepower instructions splitters and the shaft. On a motor-driven compressor, the mechanical efficiency is the compression axis indicates power and the power ratio of the compressor cylinder. Expressed as a percentage. 1. Work is divided by type of power: can be divided into DC and AC motors. 1.1 DC motor according to the structure and working principle can be divided into: brushless DC motors and brush DC motors. 1.1.1 Brush DC motor can be divided into: permanent magnet DC motors and electromagnetic DC motor. 1.1.1.1 electromagnetic DC motor division: series DC motors, DC motors and Reed, he excited DC motor and re-excited DC motors. 1.1.1.2 permanent magnet DC motor division: rare earth permanent magnet DC motor, ferrite permanent magnet DC motor and aluminum-nickel-cobalt permanent magnet DC motor. 1.2 AC motor which can be divided: single-phase motors and three-phase motors. 2. According to the structure and working principle of division: can be divided into DC motors, induction motors, synchronous motors. 2.1 synchronous motor can be divided into: a permanent magnet synchronous motor, synchronous reluctance motors and hysteresis synchronous motor. 2.2 asynchronous motors can be divided into: AC induction motor and the motor commutator. 2.2.1 induction motor can be divided: three-phase asynchronous motors, single-phase asynchronous motors and shaded pole induction motors. 2.2.2 AC commutator motors can be divided into: single-phase series motor, AC and DC motors and repulsion motors. 3. Press Start and Run Division: capacitor start single-phase induction motor, capacitor run single phase induction motor, capacitor start single-phase induction motor running and split-phase single-phase induction motor. Air Compressor Maintenance | Air Qin Wei, (certified) | by Xianyang compressor Compressor Co., Ltd. Qin Wei. Xianyang Qin Wei Compressor Co. (www.xykyj.cn/) is Xianyang, compression, separation equipment leader, over the years, the company implementing the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. Qin Wei Air leadership with the staff warmly welcome all inquiries negotiations to create Qin Wei Air a better future.