STATP PLANT BOARD
June 1914 BT-217
UNITED STATES DEARTMKNT CF AGRICXJIURZ Agricultural Research Adminis ration
Bureau of Entomolog and Plant Quarantine
A SMALL INJFZTOR FOR US2 IN MIXING SPRAYS
By Fred P. Dean, Division
of Fruit Insect Investigations
Many fruit growers in the West mix spray materials in a concentrated
form and then pump them into the spray tank with a suction tank filler or
injector. This procedure has the advantage of thoroughly mixing the materials, and it may be used for emulsifying oils, particularly the emulsive
types. Also, spray materials that are difficult to wet may be thoroughly
mixed in a concentrated form in a suitable container, and then any small
lumps may be broken up and wetted by pumping such materials through the
injector. This eliminates the need of placing them in a partly filled tank
and subjecting them to agitation for several minutes before filling the
tank. Such an injector may be used, too, for changing the physical characteristics of flocculated spray mixtures, which otherwise can be brought
about only by continued agitation or by passing them through the spray pump
Since regular tank fillers are awkward to handle and are not always
available, a mall injector made from ordinary pipe fittings has been designed, which may be used for experimental or practical orchard spraying.
Such an injector is shown in figures 1 to 4.
The body of the injector is a 1-inch tee with a 3/4-inch side opening.
In one end of the tee is fitted a 1' x 3/40 bushing. Since this type of
bushing is tapered on the inside, the taper must be removed by tapping, so
that it will receive a 3/4" x 1/2" bushing, as shown in figure 1. The bead
of the smaller bushing must be ground off so that it will slip through the hole in the tee. A 1/20 plug with a mall hole drilled through the center
is screwed into the small bushing. This forms a jet, the diameter of which
must be determined by experiment, since the most suitable size varies with
the capacity of the spray pump. A 1/80 opening is about the maximum size that
can be used with a pump delivering 20 gallons per minute. The plug should
extend at least to the mid point of the tee for the best operation. A 1-inch
pipe on the opposite end of the tee forms a suction chamber and it should be
straight for at least 15 inches.
A short length of pipe may be attached to the end of the suction
chamber by means of an elbow (fig. 3), and this may be used to direct the
spray into the tank through the opening in the top. Or a hole may be drilled
through the top of the tank near the outer edge so that the tee of the injector will extend over the edge of the tank. If this hole Is made to fit
snugly, no clamp will be necessary to hold the injector in place, as is the
case with the other arrangement.
Other necessary equipment shown-in figure ~4 includes a length of highpressure sprW~ hose with female fittings on either end, which is attached to a hose adapter Inserted in the larger bushing and which connects the injector with the pressure line from the pump. A convenient length of 3/0~ garden hose with a female fitting on one end may be used as a suction hose, and this is attached to the side opening of the tee by mesas of another hose
A 5-gallon Pail is large enough for mixing the concentrated material ordinarily used in 300 gallons of spray. The time required to pump this material into the tank varies from a few seconds to several minutes, depending upon the thickness of the mixture and the pressure used. If the mixture is too thick to pass through the injector, it must be thinned, in which case a larger container may be necessary.
1/2' PLUG X W BUSHING
Figure 1.--Oross section of injector.
Figure 2.-Principal parts of the injector*
'.hgure 3,-Aseembled iulector.
Figure 4.--Injector in operation.
UNIVERSITY OF FLORIDA 3 1262 09240 8821