Patent GB-735753-A (GB)
Title: Device for discharging a liquid under pressure, for example, water for flushing closets
IPC: F16K11/16
Filed: 1951-08-14
Abstract: 735,753. Valves. PAG PATENTGES. AKT.-GES. Aug. 14, 1951 [Aug. 14, 1950], No. 19177/51. Class 135. A valve device for discharging liquid under pressure comprises a valve chamber in which the inlet is separated from the outlet by a wall 11, containing two or more openings 11<SP>1</SP> controlled by valves 18 operated by crank means 24 which are connected to an oil dashpot 43, 2 by further crank means 50, 50a, 50b. The device is specially applicable as a flushing device for water closets and as shown comprises a valve casing 1 with inlet and outlet connections 7, 8 and a dashpot cylinder 2 connected thereto by a wall 3. The wall 11 is held against a packing 15 by a threaded ring 14 acting through a spring abutment plate 13 and a ported sleeve 12. A course control of the fluid flow is provided by an interchangeable orifice member 27. The top of the casing 1 is closed by a screw cap 16 and the top of the dashpot cylinder by a screw cap 34. The valves 18 have rubber gaskets 19 clamped in place by cap nuts 20 which form guides for the compression springs 21. The valves 18 are actuated by a ported and recessed valve lifter 22 loosely mounted in a guide 11a below the wall 11 and connected to a shaft 25 having an externally mounted hand lever 54, Fig. 2, by a connecting rod 23 and a crank 24. In the non-operative position, the valve lifter 22 rests on a ring 26 screwed into the guide 11a. The area of the valves 18 of which three or four are provided may increase in the order of opening. The dashpot cylinder 2 contains a piston 43 with a downwardly opening spring- loaded check valve 44. The piston 43 is operated by a connecting rod 42 connected to a crankshaft 39 in turn connected by crank arms 50a, 50b and a rod 50 to the shaft 25. The shafts 25 and 39 operate in self-lubricating bronze bearings. A conical enlargement 371 on the crankshaft 39 is pressed by a spring 40 against a corresponding shoulder in the bearing 37. The spring 40 also abuts a thrust ball 41. Restricted passage of oil between the two sides of the dashpot piston is permitted by a needle valve constituted as a set screw 47. The shaft 25 is also operated against a tension spring 30 connected to an arm 29. A segmental arm 29<SP>1</SP> also carried by the shaft 25 engages a spring- loaded ball stop 32 in the partly open position of the device. The stop is vertically adjustable along a curved path by means of slots 321 engaging clamping screws 5, 5<SP>1</SP>. When a partial flush only is desired the lever 54 is pulled down until the arm 291 engages the stop 32 with a noticeable click. The necessary travel of the lever for full and partial flushing is also indicated by the legends " FULL " and " SMALL " on the outside of a cover 4 secured to studs 6 by screws 5. A collar or bezel 57 is subsequently mounted over the cover 4 and pushed against a wall. The degree of flush is also indicated by an arcuate scale 52 pivoted on a hub 53 and connected to the shaft 25 through a linkage 51. The scale is visible through a gate 55 in the cover 4.