Hanna Instruments BL Series Pumps - Manual (Page 13)

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MAINTENANCE
Your BlackStone Pump is designed to give
you years of trouble-free service. Mainte-
nance should be the preventative type, that
is, periodic cleaning and inspecting for any
damage or leakage.
Cleaning the Suction, Discharge and In-
jection Valves
Remove the valves from the pumphead,
the injection fitting and the feed.
Keep the suction and discharge valves sepa-
rated as they are not interchangeable.
Disassemble each valve and clean it with a
neutral liquid. Inspect the PVDF springs.
After cleaning the glass balls, inspect them
for any excessive wear due to abrasion from
the chemical. Replace if necessary with parts
from HI 721102, HI 721103, HI 721104 and
HI 721105.
When reinstalling the valves into the
pumphead, tighten by hand first and then
with a wrench ¼ to ½ turn.
Inspecting the hose (if used as supplied
with the pump)
Inspect to see if the hose has worn out or
weakened due to the chemicals. Pay par-
ticular attention for any signs of abrasion or
discoloration. Also check the connectors to
ensure they are tight.
Replace if necessary with parts from HI
720032.
exceed 1.5 meters (5 feet). Either lower the
pump or raise the feed tank.
• Check the pumphead, suction and
discharge valves for blockage.
Pump flow rate is reduced:
• Check the pumphead, discharge and injec-
tion valve assembly for any clogging. Clean
and reassemble.
• Check for any additional back pressure cre-
ated since the last flow rate was conducted.
• Check for any changes in the viscosity of
the chemicals being used. Increase the %
flow by adjusting the Flow Rate control to a
higher setting and run a Flow Rate test.
• Be sure that valves have been properly in-
stalled in the pumphead.
Leakage at the connections:
• Be sure that the hose is fully seated and
hose connectors are tight.
• Be sure that valves are tight and O-rings
are in place.
Leakage around the pumphead:
• Be sure that the valves are tight and O-
rings are in place and the head screws
(hex bolts) are tight.