| 摘要 |
<p>852,565. Liquefied gas converters. BRITISH OXYGEN GASES Ltd. July 6, 1959 [July 7, 1958], No. 21705/58. Class 8(2). The gas and liquid spaces of a liquefied gas container 11 are connected externally by a duct 15 which includes a two position changeover valve 16 which in its normal position connects the gas space through a pressure closing valve 17 and a pressure build-up evaporating coil 19 to a liquid delivery duct 13 leading to the main evaporator coil 14 ; the valve 16 in its other position shuts off the gas space from the liquid and vents it to atmosphere through a duct 23 projecting from the valve casing 22 which also houses a normally closed filler valve 24 actuated together with the valve 16 by a common rod 21 or coupling a filling pipe to an inlet 26 of the casing 22 to effect filling of the container through a duct 25. The pressure closing valve 17 comprises a hollow tube closed by a seating 31 at the end of a spring extended bellows 29 and having a flange 17 urged by a spring against a seating 30 at a predetermined gas pressure thereby closing the external connection between the gas and liquid spaces of the container 11. On a further pressure rise the bellows 29 is retracted sufficiently to open the valve 17 and connect the gas space of the container to the liquid delivering duct 13 through the bore 32 of valve 17 and past a non- return valve 18 associated with said valve bore 32 thereby effecting economy of use of the liquefied gas. Further pressure rise results in opening a conventional pressure relief valve 33.</p> |
