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6.0
MAINTENANCE
Under normal conditions, the Mechanically Actuated Diaphragm metering pumps should not require any
significant amount of maintenance. The liquid end of the pump should also be inspected for leakage and check
the liquid head bolt torque. These observations should be made regularly.
6.1.0
CHECK VALVE REMOVAL CLEANING AND REPLACEMENT.
Should the valves need cleaning, remove as follows:
6.1.1
6.1.2
6.1.3
6.1.4
6.1.5
6.1.6
6.1.7
6.2.0
LIQUID HEAD REMOVAL, INSPECTION, AND REINSTALLATION
CAUTION: If the diaphragm failed, process fluid will pass through the bleed hole located
behind the diaphragm. Handle any liquid with appropriate care.
(Refer to liquid manufacturer's SDS)
Mechanical diaphragms should operate for approximately 2000+ hours under normal operating
conditions; however, the accumulation of foreign material or debris and abnormal operating condition
or simply age can cause failure. Failure can also occur as a result of hot pumping fluid or system over
pressure. Periodic diaphragm inspection and replacement are recommended.
6.2.1
6.2.2
6.2.3
6.2.4
6.2.5
6.2.6
NORMAL MAINTENANCE
Disconnect the power source to the drive motor.
Relieve all pressure from the piping system.
Close the isolation valves on suction and discharge piping.
Loosen and remove the suction and discharge check valves gradually to drain any trapped
liquid.
Clean valves with suitable solvent. Both valves are complete and integral units and should
not be disassembled for cleaning. If the valves are found to be worn and in need of
replacement, an entire valve in either suction or discharge should be ordered.
To replace, reverse above procedures. Make sure that the port orientation is correct.
For valves with O-rings make sure that the O-rings are in good condition. Install new
O-rings if necessary.
Adjust the stroke control knob to "0" and disconnect the power source to the drive motor.
Relieve all system pressure from the piping system.
Take all precautions described under "Caution" to prevent environmental and personnel
exposure to hazardous materials.
Disconnect piping to the Liquid Head and drain any process liquid.
Place a pan underneath the pump head adaptor to catch any liquid leakage.
Remove all but two top Liquid Head bolt. Process fluid will leak out between the pump head
adaptor and Liquid Head as the bolts are loosened.
SECTION III
11
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