| 摘要 |
1,040,211. Valves. DOVER CORPORATION. May 31, 1963 [May 31, 1962], No. 21781/63. Heading F2V. A fluid dispensing nozzle has an inlet 3, Fig. 1, a nozzle outlet 35 and valve member 8, loaded by a spring 11 towards the closed position. A lever 19, pivoted at 20 to a member 21, opens the valve against the spring loading and the lever may be held in the open position by a latch 22. When the valve is open, the flow through the valve causes a suction in passages 16, 30 and a chamber above a diaphragm 26 which chamber is vented through pipe 34 and orifice 37 until the orifice is immersed in liquid. The member 21 is normally held in the position shown by a latch mechanism comprising a bell-crank lever 56, Fig. 2 (not shown), pivoted at 57 and having a recess 62 on one leg 56b which engages a roller 50 on the member 21. The lever 56 is biased to the latched position by a spring 63 and its other leg 56a is engaged by a starter arm 60a of a lever 60 pivoted at 61. The other arm 60b of the lever 60 is bifurcated and engages a stem 40 of a head 44 secured to the diaphragm. When the pressure above the diaphragm is reduced owing to the inversion of orifice 37, the diaphragm rises against a spring 38 to rotate lever 60 in a clockwise direction which in turn rotates the lever 56 to release the member 21. The loading of the spring 11 causes the member 21 to move against the force of a spring 46 to allow the valve 8 to close. The lengths of the levers 60, 56 are preferably such that a velocity ratio of less than unity is provided between the input and output ends. |
