Nova-Tech LMI Roytronic Excel Series AD Metering Pump - Manual (Page 23)

23
MAINTENANCE
5.0 Spare Parts Replacement and Routine Maintenance
LMI metering pumps are designed for trouble-free operation, yet routine maintenance
of elastomeric parts is essential for optimum performance. This involves replacing the
Liquifram
™ , cartridge valves, O-rings, and the injection check valve spring. LMI recom-
mends replacing these parts at least once a year; however, frequency will depend on your
particular application.
5.1 Depressurizing the Discharge Line
(for Pumps Equipped with a 4-FV Only)
ALWAYS wear protective clothing, face shield, safety glasses and gloves when performing
any maintenance or replacement on your pump.
To reduce the risk of chemical splash during disassembly or maintenance, all installations
should be equipped with line depressurization capability. Using LMI’s Four-Function Valve
(4-FV) is one way to include this feature.
Read steps 1 and 2 below before proceeding.
1. Be sure the Injection Check Valve is properly installed and is operating. If a shut off
valve has been installed downstream of the Injection Valve, it should be closed.
Be sure your relief tubing is connected to your 4-FV and runs back to your solution drum
or tank.
2. Turn the black knob on the 4-FV 1/8 turn to the stop. Turn and hold the yellow knob
for a few seconds. The discharge line is now depressurized. Keep both valve knobs
open until solution drains back down the discharge tubing into the solution tank or
drum. Then release the yellow knob, and turn the black knob to its normal position.
5.2 Depressurizing the Discharge Line
(for Single-Ball FastPrime™ Heads Only)
ALWAYS wear protective clothing, face shield, safety glasses and gloves when performing
any maintenance or replacement on your pump.
Read steps 1 and 2 below before proceeding.
1. Be sure the Injection Check Valve is properly installed and is operating. If a shut off
valve has been installed downstream of the Injection Valve, it should be closed.
Be sure your relief tubing is connected to your FastPrime ™ valve and runs back to your solu-
tion drum or tank.
2. Turn the FastPrime ™ knob one-and-a-half turns counter-clockwise
4. The discharge
line is now depressurized. Keep valve open until solution drains back down the dis-
charge tubing into solution drum or tank. Then turn the knob clockwise
3 to tighten
knob to closed position.