| 摘要 |
<p>1469246 Indicating liquid levels; pressure gauges L'AIR LIQUIDE SOCIETE ANONYME POUR L'ETUDE ET L'EXPLOITATION DES PROCEDES GEORGES CLAUDE 15 Aug 1974 [17 Aug 1973] 36030/74 Headings G1, H, L [Also in Division F2] A control cock arrangement for a device for measuring pressure differences and designed to prevent damage of the device by extremes of pressure beyond those for which it is designed, comprises two isolating cocks 13, 14 and a balancing cock 15 having operating arms which interact to prevent closure of either of the isolating cocks while the balancing cock is closed and alternatively, closure of the balancing cock while either of the isolating cocks is open. In Fig. 3, isolating cocks 13, 14 are open and can be closed only by clockwise movements of their arms 29, 37. This cannot be effected until cock 15 is opened by anti-clockwise movement of its arms 43, 44. In Fig. 6 cocks 13, 14 are closed and cock 16 is open. Cock 16 cannot be closed until cocks 13, 14 are opened. The device is shown applied to a thermally insulated tank 2 for a cryogenic liquid at high pressure which is connected to a monometer 8 for measuring the height of the liquid in the tank.</p> |
