25
24
SCHEDULED MAINTENANCE
After 50 hours
Tight the
pump head
screws with a torque force of 2.5 Nm (22"
lbf).
After 12 months
It is recommended to replace
HI 721102, HI 721103
(suction and
discharge valves assemblies) as well as the O-rings. The LDPE hose can
also deteriorate over time and, for safety reasons, should also be
changed with
HI 720032.
After 24 months
It is recommended to replace
HI 721102, HI 721103, HI 720032
and
HI 721106.
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 pump head:
•
Be sure that the valves are tight and O-rings are in place and
the head screws (hex bolts) are tight.
MAINTENANCE
Your BlackStone Pump is designed to give you years of trouble-free
service. Maintenance should be the preventative type, that is, periodic
cleaning and inspecting for any damage or leakage.
CLEANING THE SUCTION, DISCHARGE AND INJECTION
VALVES
Remove the valves from the pump head, the injection fitting and the
feed.
Keep the suction and discharge valves separated 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 721105, HI 721004
and
HI 721005
(see page 34 for listing).
When reinstalling the valves into the pump head, 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 particular attention for any signs of abrasion or discol-
oration. Also check the connectors to ensure they are tight.
Replace if necessary with parts from
HI 720032
.
CLEANING THE
PUMP HEAD
The
pump head
should be cleaned at regular intervals and at
least once a year. Remove the deposits that form in the cavities with
a solution that is neutral to the chemical the pump has been dosing.
Inspect the head for any cracks or worn areas.
Replace if necessary with parts from
HI 721106
(
pump head
).
