146 DUCHAINE BLVD., NEW BEDFORD, MA. 02745-1292 TEL. 508-995-9711 FAX 508-995-5021 E-MAIL [email protected]
Page 8 Maintenance
Maintenance
Diaphragm and check Valves: Over time these parts wear and need to be replacement. The ability to
easily and quickly replace these inexpensive parts is one of the major advantages of an Edson diaphragm
pumps. Edson has packaged these parts as Spares Kits. See the parts list for the order #s.
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Change the diaphragm as required.
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Inspection and testing on a regular basis is recommended. For continuous duty application,
inspect the pump daily until a life pattern is established.
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Look for leaks, cracks or splits on the surface of the diaphragm.
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Life expectancy is directly related to head conditions, run time and diaphragm material. The
higher the suction and discharge pressures the shorter the life.
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Pressure Gauge Test - Tests the performance of the suction valve and valve seat.
1.Attach a 5’ length of non-collapsing hose or pipe with a 0 to 15 psi gauge installed
to the outlet of the pump. Make sure the line is completely sealed and air tight.
2.Turn on the pump and let it run till the gauge stabilizes. Record the reading.
3.If the suction valve is working properly the gage should build and pulse at 6 to 7 psi.
and when the pump is stopped the pressure may hold or slowly returns to 0.
4.If you do not get any pressure reading or if the gauge does not get to 4 psi and drops
off to 0 as soon as the pump stops, clean or replace the suction valve and clean or
resurface the valve seat as appropriate. See Maintenance/Valve Assemblies
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Manual Test - Testing the pump valves and valve seats without the use of a gauge.
1.Remove all fittings from the inlet and discharge of the pump.
2.Turn on the pump.
3.Put your hand over the inlet. If the discharge valve is working properly, you should feel a
very strong pulsing suction. The pulsing coincides with the raising and lowering of the
diaphragm. If you do not feel any suction, do the same thing again and listen for
air being sucked in around the diaphragm. If you hear air movement, inspect for loose
bolts or worn diaphragm. If you hear no air movement, remove the discharge
chamber and inspect the valve assembly and valve seat. Clean or replace the valve
and clean or resurface the valve seat as appropriate.
4.Press your hand over the discharge. If the inlet valve is sealing properly, the
pressure of the pump down stroke should push your hand away. If it does not and the
air is forced out the inlet remove the inlet chamber and inspect the valve assembly
and valve seat. Clean or replace the valve and clean or resurface the valve seat as
appropriate. See Maintenance/Valve Assemblies
P-120A -02 pg. 8