| 摘要 |
1,258,415. Valves. MAC VALVES Inc. 24 Dec., 1968 [14 Oct., 1968], No. 61429/68. Heading F2V. In a solenoid-operated reversing valve having an inlet port 14, a service port 21 and an exhaust port 26, Fig. 2 (not shown), control of flow between the respective ports is achieved by appropriately changing the state of a solenoid 13, the solenoid, when energized, causing downward movement of an armature 50 and hence corresponding movement of a valve member 38, such downward movement being effected in opposition to a return spring 34. Interposed between the valve body 10 and the solenoid and armature, there is a floating polepiece 53 which, in the de-energized state of the solenoid, is urged by a spring 59 on to an abutment 58. Subsequent to the solenoid being energized and valve member 38 engaging the lowermost seating 22, the polepiece overcomes the force of spring 59, moves upwardly and, by virtue of the provision thereon of a shading coil 57, locks on to the armature and so serves to reduce the inrush current to a locking current. The armature stem 37 is made to contact the valve member stem 11 at all times by the provision of a spring 83 between the topmost part of the armature and the valve casing cover 44. The valve member is made from two resilient portions 35 separated by a metallic flange 67. |
