Pump Solutions Group Neptune Solenoid-driven Diaphragm Metering Pump ARPZ-31_61_12 - Manual (Page 36)

35
Maintenance
O-ring (small)
O-ring (large)
✽ Coated with fluorine-based grease.
Ensure that there is no gap here.
Retaining nut
Make sure that no gap will be
formed between the retaining
nut and pump head.
Replacing the relief valve
IMPORTANT
Take the following action when the relief-valve function has been activated by clogging of the discharge-
side pipe, for instance.
• Shut down the pump immediately, remove the cause of the trouble, and take steps to prevent its
recurrence.
• The relief valve is a consumable. Replace it once it has been activated.
(1) Hold the retaining nut (the part shown by the arrow), and turn it counterclockwise.
Replacing the relief valve
(2) Check the O-ring of the new relief valve for dirt or foreign matter.
✽ The large O-ring comes coated with fluorine-based grease. Use it as is.
(3) Hold the retaining nut (the part shown by the arrow), turn it clockwise, and install it on the pump head.
(4) After installing the relief valve, rotate the air-release knob by two turns in the clockwise direction to ensure that the
O-ring is seated properly.
✽ This instruction is described with an example using PZ-31 (VEC type).
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