SPRAYS AND OTHER MEANS OF CONTROL 



189T 



Fig. 14. (0) A sectional view of a globe valve, 

 showing the ahi-iipt changes of direction the 

 liquid must make and the broad faces of the 

 valve and its seat where sediment is caught 

 when the valve is closed. 



pass under the lower valve into the tank. 

 "When the pressure in the air chamber 

 Is lowered, the lower valve closes and the 

 upper valve is opened by the solution 

 which is again forced into the air cham- 

 ber. Fig. 10 shows the appearance of 

 this regulator, which is large and heavy 

 in comparison with the relief valves, but 

 it is much superior to any of the other 

 pressure-regulating devices for power 

 sprayers. 



Tank Fillers 



Several forms of tank fillers, weighing 

 from 40 to 200 lbs., were furnished with 

 power sprayers of different makes several 

 years ago. The lightest kind were ro- 

 tary pumps which were of large capacity, 

 but these pumps are not long-lived, as 

 they must be run at high speed, and often 

 pump water which is full of grit from 

 ditches or ponds. 



The jet pump or ejector types of tank 

 fillers are supplanting most of the other 

 kinds, as they have no moving parts 

 to wear out or get out of order, and at 

 the same time are light and convenient. 

 They are operated by the i)ressure stream 

 from the spray pump, which is forced 

 through a reduced opening into a pro- 

 portionally larger diameter pipe. The 

 expansion of the jet of water creates a 



vacuum below the jet and lifts water 

 in amounts proportional to the pressure 

 and to the abundance of the supply. The 

 height to which water can be raised de- 

 pends upon the pressure furnished by 

 the pump, and the height of the jet pump 

 above the source of supply. If it is neces- 

 sary to raise the water to greater heights 

 than the ordinary suction hose permits, 

 place the jet pump nearer to, or in the 

 water to be raised. None of the fillers 

 will raise water successfully by suction 

 much higher than eighteen feet, but those 

 placed in the water will lift it considei'- 

 ably higher than this, depending entirely 

 i:pon the pressure of the supply to the 

 jet stream. Three different types of tank 

 fillers are shown in the illustrations. Fig. 

 11 is an ejector which may be used with 

 steam or water; by connecting it up in 

 a vertical position and turning on the 

 pressure the water is raised. It is like 

 Fig. 12 in that it depends almost entirely 

 upon the vacuum created by the jet to 

 raise the water. Fig. 13 shows a type 

 which, when dropped into the supply, 

 lifts the column of water above the pres- 

 sure jet. Each type has desirable fea- 

 tures, and the choice of kind must de- 

 pend largely upon individual taste. When 

 operated under 200 lbs. pressure, they 

 will raise from twenty to forty gallons 



Fig. in 



(10) A simply constructed large leak- 

 less cutoff. 



