146 DUCHAINE BLVD., NEW BEDFORD, MA. 02745-1292 TEL. 508-995-9711 FAX 508-995-5021 E-MAIL [email protected]
Valve Assemblies & The Valve Seats:
The sealing of the flapper valves are what makes the diaphragm
pump work. If the valves are not sealing properly, the pump will not be performing to full potential
or may not be pumping at all. The valves tend to last longer than the diaphragm. When you
change the diaphragm inspect the valves for cracks and delamination and the valve seats for
pitting and any build up that will prevent the valve rubber from sealing effectively
. Testing the
pump is the best way to evaluate performance.
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Change the valve assemblies as required.
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Inspection and testing on a regular bases is recommended. For continuous duty application,
inspect the pump daily until a life pattern is established.
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See Pump Performance Tests .
P-220A-03
Page 9 Maintenance
Trouble Shooting
2.Problem
Air Cylinder is not going
up and down.
Possible Causes
a. Air pressure is low.
b. Discharge or suction line is
blocked.
c. Air cylinder is malfunctioning.
Action
If the cause is not obvious, isolate the source.
Check air line for pressue and flow. If ok, discon-
nect the inlet and discharge plumbing from the
pump and restart the pump. If pump cycles without
the plumbing connected, there could be a clog in
the lines. The back pressure caused by a com-
plete blockage in the inlet and discharge line will
stop the pump. If the pump cylinder still does not
cycle then the problem is in the air cylinder. See
air cylinder section.
1.Problem
Pump is running, liquid
is not moving.
Possible Causes
a. Suction line is blocked.
b. Suction line has air leak
between liquid and inlet of the
pump.
c. Discharge and/or suction
valves are not working.
d. Diaphragm has a leak.
e. Discharge or suction line is
to high.
Action
If the cause is not obvious, isolate the source.
Disconnect the inlet and discharge plumbing from
the pump and perform the Manual Test. If the
cause is not in the pump check for a block or an
air leak in the suction line. Suction air leaks can
be cumulative and can be as simple as one or two
fittings not being sealed properly. Review Plumbing
The Edson Air Powered Diaphragm Pump is very simple and problems are usually isolated to the following components:
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Suction and Discharge Plumbing
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The Diaphragm and Valves
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The Air Cylinder