| 摘要 |
<p>1295513 Valves MITA MACCHINE INFIL. ZATRICI TABACCO AUTOMATICHE SARL 13 Feb 1970 [26 Feb 1969] 6985/70 Heading F2V Directional control valve device, for controlling the supply and exhaust of pressure fluid to and from external apparatus, consists of one or more spool valves 2 movable from a neutral position to connect utilization ports 8, 9 selectively with inlet 13 or with exhaust 14. A bypass valve 15 connecting the inlet directly with the exhaust is closed automatically when a spool valve is actuated. As shown, the two spools 2 are actuated by a cam lever 27 on a common shaft (26), Figs. 2 and 3 (not shown) with a lever 25 which operates a pilot valve 23 controlling the by-pass valve 15. Chambers 20, 21 of the pilot valve are in communication respectively with the exhaust 14 and inlet 13 and are placed selectively in communication with a chamber 17 behind the by-pass valve. Spaces which house the spool restoring springs 11 are vented at 30 to the exhaust 14.</p> |
