While other constructions are permissible and would fall within the scope and spirit of the present invention, {HEAD ~ the pole piece} 24 of {TAIL ~ the illustrated embodiment} forms an integral part of the valve assembly 1 
of
While other constructions are permissible and would fall within the scope and spirit of the present invention , { HEAD ~ the pole piece } 24 of { TAIL ~ the illustrated embodiment } forms an integral part of the valve assembly 1
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH