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The system demands a system buffer volume (air receiver), the size of which is determined by the desired difference between loading and off-loading pressure limits and by the permitted number of unloading cycles per hour. 5 Start/stop Throttling is a simple method to reduce flow by increasing the pressure ratio across the compressor, according to the induced under-pressure in the inlet. This method is, however, limited to a small regulation range. Liquid-injected compressors, which can overcome such a high pressure ratio, can be regulated down to 10% of maximum capacity.

Crosshead 2. Guide bearing 3. Oil scraper 4. Oil thrower ring 5. Stuffing box 6. Valve disc Piston compressor with a valve system consisting of two stainless steel valve discs. When the piston moves upwards, the large disc folds upwards and seals against the seat. The small disc’s flexi-function then allows the compressed air to be forced through the hole in the valve seat. © Atlas Copco Airpower NV, Belgium, 2010 When the piston moves downwards and draws in air into the cylinder the largest disc flexes to fold downwards allowing air to pass.

1:29 A star/delta started induction motor torque curve combined with a torque demand curve for a screw compressor. The compressor is unloaded (idling) during star operations. When the speed has reached approx. 90-95% of the rated speed the motor is switched to the delta mode, the torque increases, the compressor is loaded and finds its working point. © Atlas Copco Airpower NV, Belgium, 2010 With the delta (¨) connection the beginning and ends are joined between the different phases, which then form a delta (¨).

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