101 and valve housing 102 assembled together forming housing 103 magnetic coil 104 is nested on an inner circumferential surface of yoke ring 101 in turn surrounding armature 105 armature spring 106 armature sleeve 107 capped on a upper surface by damper 108 armature 105 is a hollow cylindrical structure abutting hollow cylindrical magnet core 110 on a lower surface of armature 105 and an upper surface of magnet core 110 armature pin 109 inserted through the middle of armature 105 and extending through magnet core 110 and into a center hole 111 of valve body 112 valve plate spring 113 surrounds the outer circumferential surface of valve body 112 and is seated at an upper periphery against spring seat 114 and a lower periphery on valve plate 115 seal ring 118 is nested between an upper surface of spring seat 114 and a lower conical surface of magnet core 110 sealing the interior cavity 120 formed by the center holes of magnet core 110 and valve body 112 from an outer cavity 121 formed by the outer surface of valve body 112 and the inner surface of valve housing 102 an upper portion of valve spring 117 is inserted into the cupped portion 122 of.