Blagdon-pump X75 Metallic Flap Valve User Manual download pdf (Page 11)

x75mfvmdl2sm-rev0411 Page 9

WARRANTY:

This unit is guaranteed for a period of ve years against defective material and workmanship.

PROBLEM

Pump cycles but will not pump. (Note: higher suction lifts require faster cycling speed for priming.)

POSSIBLE CAUSES:

A. Air leak in suction line.

B. Excessive suction lift.

C. Flap valve not seating properly.

D. Leakage at joint of suction manifold or elbow ange.

E. Suction line or strainer plugged.

F. Diaphragm ruptured.

PROBLEM

Pump will not cycle. (Note: Always disconnect air supply to relieve air pressure before disassembling any portion of pump.)

POSSIBLE CAUSES:

A. Discharge hose or line plugged, or discharge head requirement greater than air supply pressure.

(Disconnect discharge line to check.)

B. Spool in air distribution valve not shifting. (Remove end cap and check spool — must slide freely.)

C. Diaphragm ruptured. (Air will escape out discharge line in this case.)

D. Blockage in diaphragm chamber preventing movement. (Shut off air supply and reopen after pressure is relieved.)

PROBLEM

Uneven discharge ow. (Indicates one chamber not operating properly.)

POSSIBLE CAUSES:

A. Flap valve not sealing properly in one chamber.

B. Diaphragm failure in one chamber.

C. Air leak at suction manifold joint or elbow ange one side.

For additional information, see the Troubleshooting Guide.

TROUBLESHOOTING - For additional information, see the Troubleshooting Guide.

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Blagdon-pump X75 Metallic Flap Valve User Manual Page 11