Patent GB-239248-A (GB)
Title: Improvements in apparatus for delivering liquids in measured volumes
IPC: B67D7/16
Filed: 1924-03-08
Abstract: 239,248. Normanville, E. J. de. March 8, 1924. Fixed-chamber apparatus, varying quantity measured in and discharging by separate fluid. -The invention relates to apparatus comprising a measuring vessel having separate inlet and discharge valves, and consists in providing means for locking the discharge valve in the closed position until the measuring chamber has been placed under the pressure existing in the supply tank through the medium of an overflow or weir valve, and in the provision of a delayed action device for the locking means which device is worked by the overflow from the measuring chamber. Liquid under pressure is supplied through a pipe 1 and valve 3 to a vessel 2 having apertures 23 at different levels. An arm 7 on the spindle of the supply valve is connected by a link 7a to an air valve 8 to open the chamber to the atmosphere. The liquid, seen through an inspection window 6 is allowed to rise in the vessel to a height above the graduation corresponding to the quantity desired whereupon the valve 3 is closed. The handle 10 is now actuated and through gears 14, shaft 15, and gears 16 turns the spindle of the weir valve 11 until the quantity desired is indicated by the pointer 12. The weir valve comprises a number of conical bodies 18 rotatable with but slidably mounted on the spindle 17 and individually pressed against a seating by a spring 21. Each body has an opening adapted to register with the corresponding opening in the chamber wall, the openings in successive cones being spaced angularly. On rotation of the spindle 17, on the opening in the upper cone coming into register with its vessel opening, an air valve is opened to place the vessel under air pressure, the excess liquid in the vessel being delivered through the weir valve to a chamber 25 in which is a bucket 26 carried by the rod 27 and having a small opening in the bottom. Meanwhile, the discharge valves 9 of the vessel is held closed by a lug 42 engaging a notch in a disc 29 on the valve spindle. When the bucket 26, normally held up by a weighted lever 28, falls, a spindle 34 actuated through a link 32 is turned and a valve 35 is rocked to cause air under pressure to pass through ports 38 and to lift a piston 40 against a spring thereby withdrawing the lug 42 from 'the disc 29. At the same time a pin 31 connected to the lever 28 is lifted to enter a second notch in the disc 29 and hold the discharge valve closed. After a short interval, after the liquid has leaked away from the bucket 26. the latter is raised by the counterweight and the discharge valve released. Upon turning the handle 30<a>, the discharge valve is opened and the measured volume remaining in the vessel is delivered under pressure. The turning of the spindle 30 through the slotted link 44 and lever 33 turns the valve 35 to place the cylinder 39 in communioation with the atmosphere through the ports 38<a>, the piston 40 and lug 42 being pressed down by the spring ready to engage the notch. A finger 49 carried by a hollow rod 48 connected by a spring to a rod 47 connected in turn by a link to the arm 43 is lowered to engage a stepped disc when the discharge valve is open and thus prevent the weir valve being set to a lower opening from that selected. A lug 46 on the disc 29 cooperates with the arm 7 on the inlet valve to lock this valve closed when the discharge valve is open. On closing the valve 9, the valve 35 is rocked but owing to the slot in the link 43 the rocking is insufficient to open the cylinder 39 to compressed air. A flat closes a valve below the valve 8 when the liquid rises sufficiently in order to prevent loss through the air valve. The shaft 15 may be associated with suitable counting mechanism. A float-operated gong may be fitted to give audible signals when particular levels are reached.