Nova-Tech LMI Roytronic Series A Metering Pump - Manual (Page 26)

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MAINTENANCE
5.4 Cartridge Valve and O-ring Replacement
ALWAYS wear protective clothing, face shield, safety glasses and gloves when working on
or performing any maintenance or replacement on your pump. See MSDS information from
solution supplier for additional precautions.
Refer to the LMI Metering Pump Price List for the proper Spare Parts Kit or RPM Pro
Pac
™ kit number or contact your local LMI stocking distributor.
1. Carefully depressurize and disconnect the discharge line (see Section 5.1 or 5.2 in this
manual).
2. Place the Foot Valve into a container of water or other neutralizing solution. Turn the
pump on to flush the head assembly. Once the pump has been flushed, lift the Foot
Valve out and continue to pump to let air into the pump head until pump is purged
of water or neutralizing solution.
If the liquid cannot be pumped due to Liquifram ™ rupture, carefully disconnect the suction
and discharge tubing using protective clothing, gloves and face shield. Remove the four screws
and washers from the head and immerse the head in water or other neutralizing solution.
Spare part replacement kits include specific instructions for valve replacement. Please
follow the instructions included with the replacement kit.
3. Carefully disconnect one tubing connection and fitting at a time, then remove and
replace the worn valve and O-rings. If necessary, carefully loosen stuck valves by pry-
ing side to side using a small screwdriver through the center hole of the valve.
Before disassembling the check valves, note the orientation of the valve.
4. Install new check valves in each location. Ensure that the cartridges are oriented
correctly.