| 摘要 |
<p>970,616. Valves. W. CARLS. Aug. 24, 1962 [Aug. 25, 1961], No. 32599/62. Heading F2V. Connection of working ports 12, 14 to a pressure port 34 or one or other of two exhaust ports 28, 32, is controlled by a piston valve 60 loaded to the position shown by a spring 50 and slidable in a ported sleeve 38 held in place between a plug 42 and sleeve 52, through an opening in which passes a stud 62 upstanding from the valve 60. The valve is actuated via a cam roller on a lever 84, a thimble 66 axially movable into the sleeve 52, a spring 74 between the thimble, and a plunger 70 engageable with the stud 62. Lost-motion between the lever 84 and valve 60 is provided by the spring 74 and upon the valve 60 abutting the plug 42 further lost-motion is permissible due to a crosspin 78 in the plunger 70 being slidable in an opening 76 in the thimble 66. A number of valves may be bolted together to form a stack, the ports 28, 32, 34 being aligned with corresponding ports in the adjacent valves. The valve casing has a cover plate 56, the securing bolts 58 for which are accessible through openings in the lever 84. In a modification, the valve is arranged for individual use with the ports 38, 32, 34 opening through the side of the casing opposite to the working ports. The upper exhaust port is of reduced size and flow therethrough is controlled by an independent manually-adjustable needlevalve.</p> |
