1 2" bull plug
1 2" "T"
1 Best* choke bean (size
to be determined by actual pump tests)
1 Best* choke cage
1 2" coupling
1 2" nipple (length to
1 2" x ½" swage
1 ½" coupling
3 ½" x 1 ½"
1 ½" check valve
1 ½" male x female
1 ½" elbow
1 ½" ball valve
1 Best* choke wrench or
1" octagon tool stock 1’ long
*Best is a registered trade mark, other brands may
work as well in this application.
YCRVFD FOAM EDUCTOR PAGE 2
Insert small end of 7 into 6, and precisely mark how
far it goes in.
Screw parts 4, 5 , and 6 together tight.
Measure the space from the open end of 6 to the end
Measure the distance marked in step 1, add ¼".
Subtract this total from the distance measured in step3.
Mark the result of step 4 on part 6, and cut part 6
off at this mark.
Insert 7 into 6, align it carefully and weld the two
Weld part 8 to the side of part 5. Drill ¼" or
larger hole into part 5 through the opening in part 8.
Insert part 3 into part 4 and tighten with part 14.
Assemble all parts as shown in diagram.
Install assembly on apparatus, keeping simplicity of
operation of primary concern.
Hook up as long a hose line as you will ever use and
attach the foam nozzle you are going to use.
Open the metering valve and the ball valve.
Start pumping water through foam eductor, hose line,
and nozzle. Set pump at desired operating pressure.
A strong vacuum should be maintained at the ball valve.
If no vacuum or little vacuum is obtained, install a smaller choke bean.
Maximum efficiency will be achieved with the largest size choke bean that
will still produce a strong vacuum at the ball valve.
A workable pick up tube can be made from an 18" piece
of ½" pipe and a length of ¾" clear vinyl tubing.
If everything has gone well to this point, try the system
using the foam concentrate of your choice. Adjusting the metering valve
should produce consistent foam mixing all the way from 0% to10%. Make a
note of the metering valve settings that produce the desired result with
the particular foam concentrates you are using.
While we have found this equipment to operate properly
under varying conditions, this information is provided at no charge and
is submitted for your review only. We will assume no liability resulting
from the construction, use of, nor the performance or lack of performance
of this assembly.