15.3 - Maintenance of Type B hydraulic diaphragm pump heads
15.3.1 - Operations to be performed on the Type B pump head
Periodic check of the pump head
Failures or malfunctions may occur due to negligence leading to extraordinary maintenance: proceeding
with a periodic visual check, as described in the SR REDUCER manual, preventive maintenance
chapter. It is, at times, possible to avoid the arising of situations that require extraordinary maintenance.
In the presence of these anomalies we recommend readily
intervening in order to avoid safety problems, a reduced flow
rate and reduced efficiency of the pump.
Summarising, the checks to be carried out are:
✓ Periodic checks of the pump head must be carried out to
ensure that the pump is safe and operating correctly.
✓ Particular attention must be paid if the pump head installed
is made of plastic as it is more sensitive to temperature
variations and settling phenomena.
✓ Check for oil leaks from the filler and drain caps, from the
diaphragm pinching or from the piston seal. Any one of
these leaks may initially cause a decrease in the flow rate,
followed by the breaking of the diaphragm at a later date.
✓ Check for dosed liquid leaks from the valves.
15.3.2 - Pump head disassembly and diaphragm replacement
In this pump model the head is directly blocked on the oil chamber,
therefore, the oil contained in the chamber must be drained for any
maintenance intervention to the various components.
Proceed as follows:
➢ Disconnect the piping from the valves.
➢ Drain the oil reservoir by unscrewing the bottom plug, allow
the product to drain into a container and dispose of the
product according to regulations.
➢ Loosen the screws on the front of the pump head.
➢ Remove the head from the pump.
➢ Remove the diaphragm; if damaged, replace it.
Replacement is recommended if the piston and oil chamber are
damaged due to the corrosion of the pumped product.
N.B.: Once maintenance operations have been completed,
reassemble the components following the above mentioned
operations in reverse order.
15.3.3 - Piston disassembly and reassembly
The piston is blocked on the slide by means of two grub screws, one visible in the upper part and the
other hidden in the lower part.
Proceed as follows to remove the piston:
After completing operations to remove the pump head and check the oil reservoir.
✓ Remove the guards.
✓ Loosen screws inside the lantern that block the oil reservoir.
✓ Remove the oil reservoir.
✓ Remove the gasket ring from the piston
✓ Unscrew the visible grub screw.
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