| 摘要 |
<p>A hot melt adhesive or other thermoplastic material dispensing valve assembly (100) comprises a pair of oppositely disposed electromagnetic solenoid assemblies (104,106) which alternatively act upon a pair of armatures (224,226) which are fixedly mounted upon a valve stem (218), upon which is fixedly mounted a valve member (216), so as to rapidly and assuredly control the reciprocal movements of the valve stem (218), and the valve member (216) attached thereto, between its unseated or OPENED position and its seated or CLOSED position. A coil spring (232) also biases the valve stem and the valve member toward the seated or CLOSED position such that when both of the electromagnetic solenoid assemblies are deenergized, the coil spring maintains the valve member (216) at its seated or CLOSED position upon the valve seat (190).</p> |
