SAFETY DEVICE FOR LIQUEFIED PETROLEUM GAS CONTAINERS WITH LIMITED RATE OF DELIVERY

摘要

1,209,164. Liquefied gas-storage containers. L. BAGNULO. 7Nov., 1967 [1 Nov., 1966], No. 49637/67. Heading F4P. [Also in Division F2] Means for discharging a predetermined volume of gas from the gas space of a liquefied gas, e.g. petroleum gas storage cylinder 3, Fig. 1, when a two-position discharge valve 21 is opened by moving an external lever 13 from its closed to open position shown in Fig. 3 comprises a float 40 which when the lever 13 is in the open position is latched to a rod 26 extending through the float and having its upper square end 25, Fig. 4, in sliding engagement with a squaresectioned chamber 24 formed in the lower end of the valve 21 and carrying an abutment 36 which when the float 40 sinks a certain distance, irrespective of the liquid level, releases a valveholding pin 30 thereby allowing the valve 21 to be closed by a spring 19 even though the lever 13 remains in the open position. The lever 13 is fixed to an arbor 12 which projects through a fixed member 14 and has a square end 16 slidable in a recess in the upwardly spring-biased head 17 of a shank 20 integral with valve 21. The upper end of the head 17 has diametrically opposed cam lugs 18, 181, Fig. 5, which when the lever, arbor and head are rotated ride over lugs 15, 151 on fixed member 14 resulting in opening of valve 21 to a position in which a notch 37 is engaged by the pin 30. The rotational movement of the valve when being opened is transmitted to the rod 26, which after a 90 degrees turn is latched to the float by engagement of diametrical longitudinal extending ribs thereon with spring clips on the float and the rod is thus moved downwardly by the float as the liquefied gas vaporizes until the abutment 36 strikes a lever 33 to withdraw the pin 30 and allow valve 21 to be closed by its spring 19. To effect a further discharge of gas lever 13 is moved from its open to its closed position resulting in rod 26 being rotated 90 degrees and unlatched from the float 40 and returned by its spring 49 so that its square end 25 is near the upper end of chamber 24 in valve 21 and the lever 13 is then turned to the valveopen position. In a modification the upper square end of the rod 26, Fig. 8, is in direct sliding engagement with the arbor 53, and the two-position valve 55 is unseated by an arm 56a of a three-armed lever 56 having an arm 56c engaging a cam slot 51 in an extension 52 of the arbor 53. The third arm 56b when engaged by the abutment 36 on rod 26 in its lower position rotates lever 56 to close the valve 55. As in the previous embodiment rod 26 becomes latched to the float when the manual lever 54 is turned from the valve-closed to valve-open position and the rod remains latched until the lever is returned to the valve-closed position. (For Figures see next page.)