Warren rupp HDB1, Service And Operating Manual

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hdb15dl6sm-REV0208 Models HDB1½-A, HDB40-A Page 3
AIR INLET & PRIMING
For start-up, open an air valve approximately 1 /
2
to 3 /
4
turn. After the unit primes,
an air valve can be opened to increase flow as desired. If opening the valve increases
cycling rate, but does not increase flow rate, cavitation has occurred, and the valve
should be closed slightly.
For the most efficient use of compressed air and the longest diaphragm life, throttle
the air inlet to the lowest cycling rate that does not reduce flow.
AIR EXHAUST
If a diaphragm fails, the pumped liquid or fumes can enter the air end of the pump,
and be exhausted into the atmosphere. When pumping hazardous or toxic materials,
pipe the exhaust to an appropriate area for safe disposition.
This pump can be submerged if materials of construction are compatible with the
liquid. The air exhaust must be piped above the liquid level. Piping used for the air
exhaust must not be smaller than 1" (2.54 cm). Reducing the pipe size will restrict
air flow and reduce pump performance .When the product source is at a higher level
than the pump (flooded suction), pipe the exhaust higher than the product source to
prevent siphoning spills.
Freezing or icing-up of the air exhaust can occur under certain temperature and
humidity conditions. Use of an air dryer unit should eliminate most icing problems.
BETWEEN USES
When used for materials that tend to settle out or transform to solid form, the pump
should be completely flushed after each use, to prevent damage. Product remaining
in the pump between uses could dry out or settle out. This could cause problems with
valves and diaphragms at re-start. In freezing temperatures, the pump must be drained
between uses in all cases.
CHECK VALVE SERVICING
For best priming and most efficient pumping performance, it is important to maintain
check valves and valve seats in good condition for proper sealing. Need for inspection
or service of ball valves is usually indicated by poor priming, unstable cycling, reduced
performance, or pump cycles but will not pump.
Inspection and service of check valves requires the removal of six bolts which
provide access to all four ball valves and both, suction and discharge, valve seats.
New ball check valves are 2
1
/
4
" (5.715 cm) diameter and will require replacement when
worn to approximately 2" (5.08 cm) diameter.
DIAPHRAGM SERVICING
Need for inspection, or service, of diaphragm is usually indicated when unit pumps
from one chamber only and air is discharged out pump discharge port or when liq-
uid being pumped is discharged through air exhaust port. To service diaphragms,
remove V-Band clamp (no. 15) and two hex nuts (no. 29) which secure chamber port
to manifold. To remove diaphragms, loosen diaphragm assembly (outer plate no. 20,
diaphragm no. 21, inner plate no. 19) by turning out of the shaft using a wrench. A 1"
(2.54 cm) square lug is provided on the outer plate (no. 20) for this purpose. Removal
of opposite outer chamber will permit removal of second diaphragm assembly and
shaft as a unit. To disassemble the diaphragm assemblies, clamp the inner diaphragm
plate (no. 19) around the outer diameter between jaws of a vise to hold it while you
turn the outer diaphragm plate (no. 20) loose using a wrench. Interior components
consisting of shaft seals and sleeve bearings are now accessible for service if required.
REASSEMBLY
All procedures for reassembling the diaphragms are just in reverse of previous
instructions for disassembly. The diaphragms are to be installed with their natural
bulge outward or toward the outer diaphragm plate (no. 20). Make sure the inner plate
is installed with the flat face against the diaphragm.
After all components are in position in vise and hand tight, tighten with wrench to
approximately 40 ft. lbs. (54.23 Newton meters) torque. After each diaphragm assembly
has been made, thread one assembly into shaft (no. 16) (hold shaft near middle in vise
having soft jaws to protect finish). Install this sub assembly into pump and secure by
placing the outer chamber (no. 22) on the end with the diaphragm. This will hold the