Patent GB-191775-A (GB)
Title: Improvements in or relating to apparatus for spraying or atomising liquids
IPC: B05B15/50
Filed: 1921-08-20
Abstract: 191,775. Kershaw, H., and Clarke, H. Aug. 20, 1921. Fluid-actuating mechanism; valves actuated by fluid under control of auxiliary control valve. - Apparatus for atomizing liquids, fur disinfecting, humidifying, liquid-fuel burning, and other purposes, of the kind in which the supply or delivery of liquid only takes place when the pressure of air or other atomizing-fluid exceeds a predetermined amount, is so arranged that, when the atomization is arrested, free and uninterrupted passages are open so that all unatomized liquid is drained away, such drainage being assisted by air suction. Air under pressure is supplied by a pipe 19, Fig. 1, and liquid by a pipe 2. In the inoperative position, a valve 6 cuts off the supply of liquid to the spray nozzles and connects the pipe line 22 to drainage 24. This valve is actuated by means of a diaphragm 7, the space above which is connected by a pipe 21 to a chamber a in a casting 9 and in the inoperative position is connected through a port 12<a> to drainage. On the air pressure rising to a predetermined amount, it acts on a dia. phragm 17 to raise piston 11, first closing the port 12<a> and then raising a valve 10 to admit pressure water to the space 5<a> above the diaphragm 7, thus moving the piston valve 6b downwards, disconnecting the pipe line 22 from drainage and admitting liquid through the port 6a and pipe 22 to the spray nozzle. On the pressure of the air falling, the reverse movement of the valve takes place. A pipe 4<b> connects the liquid supply pipe 4 to the chamber 4<c> so that, should the water pressure exceed a predetermined amount, it will raise a diaphragm carrying a block 4f, which acts on a lever 15 pivoted at c to depress the piston 11 and thus cause the liquid supply to be cut off. In a modification, the valves for controlling the supply of liquid to and the drainage from the pipe 22 are formed similar to the valves 10, 11. One form of spray-head is shown in Figs. 3, 4, and 5, and is mounted to turn in a horizontal plane on a plug 34 and in a vertical ,plane on a plug 40. Liquid is supplied by the pipe 22 and air by the pipe 19 to chambers 27, 27<a>, each containing a filter, and from thence by passages h, k to the vertical plug 34 and thence by passages 35, 36 to the nozzle. The nozzle is supplied with air through the central passage p controlled by the needle valve 42<a> and with liquid through the passage v to an annular outlet m. Normally, a spring-pressed piston 43 bears against a hollow valve body f and forces the needle valve to close the opening p, as shown in Fig. 4. On the pressure of the air rising, it forces back the piston 43 and allows the spring 45 to open the passage p, as shown in Fig. 3. On the air pressure falling, the piston 43 moves into the portion shown in Fig. 4, moving the valve member 42 to the right, closing the opening p and at the same time opening a port g to allow air to escape thus causing a suction to assist the liquid in the passage v to drain away. The nozzle is provided with a cap 38 having radial grooves p<1>.