19
Instruction Manual
SECTION 4 - MAINTENANCE
4.3 LIQUIFRAM™ DIAPHRAGM
REPLACEMENT
ALWAYS WEAR PROTECTIVE
CLOTHING, FACE SHIELD,
SAFETY GLASSES AND GLOVES WHEN WORKING NEAR OR
PERFORMING ANY MAINTENANCE OR REPLACEMENT ON
YOUR PUMP. SEE SDS INFORMATION FROM SOLUTION
SUPPLIER FOR ADDITIONAL PRECAUTIONS.
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™
DIAPHRAGM, cartridge valves, O-rings, and the
injection check valve spring. LMI
®
recommends
replacing these parts at least once a year;
however, frequency will depend on your particular
application.
When replacing the LIQUIFRAM™ DIAPHRAGM,
the cartridge valves, or O-rings, the injection check
valve spring should also be replaced (
see next
Section 4.4
). A Spare Parts Kit or RPM PRO PAC™
kit containing these parts may be obtained from
your local distributor.
Replacing the LIQUIFRAM™ DIAPHRAGM:
1. Carefully depressurize, drain and disconnect
the discharge line (
see previous sections 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 head
has been flushed, lift the Foot Valve out of the
solution and continue to pump air into the pump
head until the pump head is purged of water or
neutralizing solution.
NOTE:
If the liquid cannot be pumped due to
LIQUIFRAM™ DIAPHRAGM 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.
3. Start the pump. While running, set the Stroke
Adjustment Knob to 0% and turn the pump
OFF.
™
Head
Drive
Shaft
Seal
Adapter Disk
LIQUIFRAM
Figure 17. Liquifram
TM
Diaphragm Replacement