pin 218 are each now only in contact with the radial bearings 222 these radial bearings 222 are free to move within the cage 220 and thus allow the push pin 218 to move within the pole piece 214 with minimal resistance it should be noted that although only one cage 220 is shown the particular location several cages 220 may be utilized and in different locations the reduced diameter end of the armature 216 is received with tight supporting fit on the adjacent end of the spool 228 the nozzle body 226 includes supply port 234 defined between o ring seals 238 and 240 and protected by filter 260 control port 232 defined between o ring seals 236 and 238 and protected by filter 262 exhaust port 230 and end exhaust opening 256 in the nozzle cap 254 the spool 228 is moved in response to movement of the armature 216 to regulate pressure at the control port 232 the outer end of the push pin 218 and thus the armature 216 is biased by a spring mechanism 244 fig2 shows a conical coil spring though other types of spring mechanisms may be used the spring mechanism 244 is confined between a spring cap 242 and a calibration cap 204 that may be deformed to adjust spring preload that establishes the high pressure state of the control valve shown.