It is an object to control the traffic that flows in a radio link to ensure the stability of the network as well as to prevent the deterioration of the communication quality due to the transmission of packets exceeding the capacity, and to increase the communication capacity. The circuit device further includes a logic circuit to alternately provide sets of the received sampled bits from the continuous bit stream to one of a first syndrome generator and a second syndrome generator to correct errors in the sets of sampled bits to produce a decoded output related to the continuous bit stream. If the control air is shut off, then the sealing ring closes the delivery of the parting agent, and the second, larger end of the control piston exercises upon its return movement a reverse suction effect on the connecting passage. The rotational energy is transferred to a generator through a combining gear box and transmission communicating with the energy delivery system.