Apparatus for controlling the passage of water to surayers and the like

摘要

312,181. Elder, D. May 21, 1928, [Convention date]. Valves actuated by rotary motors.-A valve device adapted to close automatically after a predetermined interval of flow and particularly adapted for controlling the flow to sprayers used for distributing water over areas of land has a cam stop for determining the duration of flow and is closed by a rotary water motor acting through bevel, worm, and screw gearing. The valve 10 which controls the flow of water from the inlet 7 to the outlet 4 leading to the sprayer is mounted on a spindle 11 slidably mounted in a guide 11 and provided at its upper end with a flanged fitting 12 adapted to engage the cam stop to determine the travel of the valve. The stop is adjusted by a bevel wheel 30 engaging a similar wheel 29 on a hollow shaft 25 rotated from outside the casing 6 by a pointer 27 moving over a scale 28. The water motor is supplied through a port 3 and is connected by bevel gearing 40 with a worm engaging a pair of worm wheels 38, 39 having a different number of teeth, the wheel 39 being slidably but non-rotatably mounted on the spindle while the wheel 38 is rotatably mounted on the spindle. The wheel 38 carries a pivoted catch 44 adapted to be moved into operative engagement with a screw-thread 45 on the spindle by a ring 37 actuated by pressure-water acting on a spring-loaded piston 33. After closing, the valve is locked in its closed position by a spring-pressed pivoted catch 19. To start the apparatus, the supply is cut off to reduce the pressure in the valve casing to permit the spring 17 to operate the piston 16 to release the catch. The spring- pressed plunger 13 then starts the downward movement of the valve, which continues until the flange 12a engages the stop 31. If the water is now turned on, the motor commences to revolve and the catch 44 is engaged to cause the valve to move slowly towards its seat. As the valve seats, a bye-pass valve 21 may be opened. The bye-pass valve comprises a sluice valve 21 guided by a loop 20a and is actuated by a rod 19 secured to the valve 10 and engaging a trip-catch 22 held in the operative position, until the valve 21 is closed, by a projection 24 on the casing.