When {HEAD ~ no torque} is applied to {TAIL ~ the steering shaft}, the internal valve element 12 assumes the neutral position shown in FIG 2 
is applied to
When { HEAD ~ no torque } is applied to { TAIL ~ the steering shaft } , the internal valve element 12 assumes the neutral position shown in FIG 2
OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH