the air inlet port 56 through the valve body and out through the air outlet port 50 in order to close the valve a deactivating current is applied to the valve in an opposite polarity as the initial activating current the deactivating current is less than the activating current the deactivating current can be applied for about 0 1 to 0 5 milliseconds preferably 0 12 milliseconds at about 0 3 amps alternatively the deactivating current can be a sequence of alternating degaussing currents the preferred voltage for the valves is 12 volts however the present invention is not limited to the voltage amp and time values set forth above the present invention is not limited to the particular details of a valve one of ordinary skill in the art would contemplate that other types of valves could be used according to the present invention however it is preferable that the valve used is of a small size and of a high speed turning attention now to fig3 and 4 an air flow circuit of an embodiment of the present invention is illustrated the various components of the preferred embodiment of the present invention are illustrated in schematic form and are not necessarily drawn to scale an air inlet 22 is connected to a source of pressurized air and is used to deliver the pressurized air to the two valves 18 20 a venturi 36 is also mounted in the frame 16 of the spindle assembly 10 an air passage 28 connects the outlet of valve 20 with a first end of the venturi 36 the venturi 36 is constructed such that when an air pressure is delivered to the first end thereof a vacuum is created at the outlet 39 of the venturi 36 another air.