Prochem Legend GT - Manual (Page 32)

30
Operations
Chemical Injection System
The chemical injection system is unique in that it
utilizes the pressure spikes generated by the high
pressure solution pump to move chemical into the main
solution stream. The high pressure spikes move the
diaphragm in the chemical pulse pump forcing small
amounts of liquid chemical to be moved in a single
direction of flow with the aid of two check valves.
The chemical is drawn from the container, and through
the flow meter, which indicates rate of flow. The
chemical then moves to the chemical pulse pump
where it is pressurized.
The chemicals flow to the chemical selector valve,
which can turn off the chemical flow or when set to
"Prime" sends it into a bypass loop to purge air from the
system, or when "CHEM" the chemical can be directed
to the metering valve. The metering valve controls the
amount of chemical that enters the solution outlet
manifold.
The manifold assembly's check valve will not allow the
chemicals to travel upstream into the plumbing system
of the unit. The chemicals are mixed there with hot
pressurized water that makes a cleaning solution. The
solution then flows to the outlets for cleaning.
86313050 LEGEND GT
CHEMICAL
OFF
ON
FLOW METER PRIME
METERING VALVE
CONTROL VALVE
CHEMICAL JUG
CHEMICAL PUMP
OUTLET SCREEN
OUTLET CHECK VALVE
SOLUTION PUMP
SOLUTION OUTLET