WIL-11610-E-02
19
WILDEN PUMP & ENGINEERING, LLC
OPERATION: The Pro-Flo X™ pumps are pre-lubricated
and do not require in-line lubrication. Additional
lubrication will not damage the pump, however if the
pump is heavily lubricated by an external source, the
pump’s internal lubrication may be washed away. If the
pump is then moved to a non-lubricated location, it may
need to be disassembled and re-lubricated as described
in the DISASSEMBLY / REASSEMBLY INSTRUCTIONS.
Pump discharge rate can be controlled by limiting the
volume and/or pressure of the air supply to the pump. A
regulator is used to control air pressure while a needle
valve is used to control volume. Pump discharge rate
can also be controlled by throttling the pump discharge
by partially closing a valve in the discharge line of the
pump. This action increases friction loss which reduces
flow rate. (See Section 5.) This is useful when the need
exists to control the pump from a remote location.
When the pump discharge pressure equals or exceeds
the air supply pressure, the pump will stop; no bypass
or pressure relief valve is needed, and pump damage
will not occur. The pump has reached a “deadhead”
situation and can be restarted by reducing the fluid
discharge pressure or increasing the air inlet pressure.
The Pro-Flo X™ pumps run solely on compressed air
and do not generate heat, therefore your process fluid
temperature will not be affected.
MAINTENANCE AND INSPECTIONS: Since each
application is unique, maintenance schedules may be
different for every pump. Frequency of use, line pressure,
viscosity and abrasiveness of process fluid all affect
the parts life of a Wilden pump. Periodic inspections
have been found to offer the best means for preventing
unscheduled pump downtime. Personnel familiar with
the pump’s construction and service should be informed
of any abnormalities that are detected during operation.
RECORDS: When service is required, a record should be
made of all necessary repairs and replacements. Over
a period of time, such records can become a valuable
tool for predicting and preventing future maintenance
problems and unscheduled downtime. In addition,
accurate records make it possible to identify pumps
that are poorly suited to their applications.
Pump will not run or runs slowly.
1. Ensure that the air inlet pressure is at least 0.3 bar
(5 psig) above startup pressure and that the differential
pressure (the difference between air inlet and liquid
discharge pressures) is not less than 0.7 bar (10 psig).
2. Check air inlet filter for debris (see SUGGESTED
INSTALLATION).
3. Check for extreme air leakage (blow by) that would
indicate worn seals/bores in the air valve, pilot
spool and main shaft.
4. Disassemble pump and check for obstructions in
the air passageways or objects that would obstruct
the movement of internal parts.
5. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers,
swelling may occur. Replace ball check valves and
seals with proper elastomers. Also, as the check
valve balls wear out, they become smaller and can
become stuck in the seats. In this case, replace balls
and seats.
6. Check for broken inner piston that will cause the air
valve spool to be unable to shift.
7. Remove plug from pilot spool exhaust.
Pump runs but little or no product flows.
1. Check for pump cavitation; slow pump speed down
to allow thick material to flow into liquid chambers.
2. Verify that vacuum required to lift liquid is not
greater than the vapor pressure of the material
being pumped (cavitation).
3. Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers,
swelling may occur. Replace ball check valves and
seats with proper elastomers. Also, as the check
valve balls wear out, they become smaller and can
become stuck in the seats. In this case, replace balls
and seats.
Pump air valve freezes.
1.
Check for excessive moisture in compressed
air. Either install a dryer or hot air generator for
compressed air. Alternatively, a coalescing filter may
be used to remove the water from the compressed
air in some applications.
Air bubbles in pump discharge.
1. Check for ruptured diaphragm.
2. Check tightness of outer pistons (refer to Section 7).
3.
Check tightness of fasteners and integrity of
O-rings and seals, especially at intake manifold.
4. Ensure pipe connections are airtight.
Product comes out air exhaust.
1. Check for diaphragm rupture.
2. Check tightness of outer pistons to shaft.
T R O U B L E S H O O T I N G
S U G G E S T E D O P E R A T I O N & M A I N T E N A N C E
Summary of Contents for PSG Wilden PX220
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Page 9: ...P X 2 2 0 P X 2 3 0 P E R F O R M A N C E PX220 PX230 M E T A L ...
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