| 摘要 |
<p>1297825 Valves ALLIS-CHALMERS MFG CO 21 Aug 1970 [27 Aug 1969] 40367/70 Heading F2V [Also in Divisions B1 and H1] An hydraulic fluid filter circuit comprises a filter 3 including an inward-flow, cylindrical filter element 10 and a spring-loaded by-pass valve 21 whose seat 22 and movable member 23 constitute a pair of contacts in an electric circuit whereby warning is given when the valve is opened. Spring 24 is mounted on an insulating sleeve 25 and connected to the positive side of battery 29 through insulated terminal 26. In Fig. 1 lamp 31 goes out when the valve opens. Fig. 3 (not shown) illustrates use of a relay to cause the warning lamp to come on when the valve opens. In Fig. 2 (not shown) the audible alarm (39) is connected in parallel with the valve so as to be short-circuited until the valve opens, whereupon current passes through and actuates the alarm. Switches 37 and (40) enable the alarm to be tested with the valve closed. Housing 9 is secured to head 7 by wing bolt 13 screwed into hollow outlet spigot 14.</p> |
