2-70. CHEMICAL METERING PUMP REPLACEMENT/REPAIR (CONT)
c. Dosing Head Disassembly
Remove pump (subpara b).
Remove four screws and flatwashers. Remove dosing head, diaphragm, and disc head.
Set pump stroke length knob at 0 percent.
Ball check valves are located in the foot valve and suction inlet on the dosing head, the pressure
outlet on the dosing head, and the injection valve on the process stream. These valves are all the
same and are disassembled for cleaning or parts replacement.
.Remove discharge valve body and O-ring. Remove valve ball and O-ring.
.Remove suction valve body and O-ring. Remove valve ball and O-ring.
.Remove bleeder valve and O-ring.