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HPRB series pneumatic dual pisten type executors change output power into 900 or 600 to use, then output as torsional type. Executor is seperated into single action type (spring gets its seat ) and dual action type on the base of structure. It uses dual pisten, dual trank shape or gear shape. Its structure characterics are little demination, big output torsion. It is installed locator elecromagnetic valve, realize auto-control and prossure control. It has the best start torsion and resonable torision curve, it is used in controlling valve the angle transfer of butterfly valve and ball valve.