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The need for energy savings is on the rise. Pneumatic systems, as essential   parts of any branch of industry, are large consumers. The opportunities for   saving energy in these systems are great. The paper presents a structure of   pneumatic systems while a special emphasis is put on the saving of energy in   the execution part with semi-rotary actuator by a method of restoring energy   via by-pass valve. The realized energy savings are average 41.48% for   conventional systems and 31.42% for servo systems for nominal operating value   of pressure supply of 600 kPa. Cost effectiveness of proposed method is also   presented

Advantages of restoring energy in the execution part of pneumatic system with semi-rotary actuator