Dover Wilden Advanced Series Techniek, werking en onderhoud - Pagina 9
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S e c t i o n 5
T R O U B L E S H O O T I N G
Pump will not run or runs slowly.
1.
Ensure that the air inlet pressure is at least 0.4 bar
(5 psig) above startup pressure and that the discharge
pressure is at least 0.7 bar (10 psig) lower than 26 times
the air inlet pressure.
2.
Check air inlet filter for debris (see recommended instal-
lation).
3.
Check for extreme air leakage (blow by) which would
indicate worn seals/bores in the air valve, pilot spool,
main shaft.
4.
Disassemble pump and check for obstructions in the
air passageways or objects which would obstruct the
movement of internal parts.
5.
Check for sticking ball check valves. If material being
pumped is not compatible with pump elastomers, swell-
ing may occur. Replace 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 liquid piston stud which will cause the
air valve spool to be unable to shift.
7.
Remove plug from pilot spool exhaust.
WIL-11181-E-04
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, swell-
ing may occur. Replace 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.
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 applica-
tions.
Air bubbles in pump discharge.
1.
Check tightness of fasteners and integrity of O-rings and
seals, especially at intake manifold.
2.
Ensure pipe/tube connections are airtight.
Product comes out air exhaust.
1.
Check for liquid piston seal failure.
2.
Check tightness of liquid pistons to shaft.
7
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