Blagdon Pump | Troubleshooting Blagdon Pumps

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TROUBLESHOOTING GUIDE

Occasionally some circumstance may cause a Blagdon Pump product to malfunction. The following scenarios provide possible solutions to the most common issues experienced with Blagdon Pump products. Before using the Troubleshooting Guide, customers should be aware that most issues with Blagdon products can be solved by routine maintenance, but if the Troubleshooting Guide is still needed then all solutions should be checked before dismantling the pump.

Pump will not start - Erratic Flow - Pump strokes but will not discharge
Fluid Discharged from Air Exhaust - Intermittent Stroke Rate

SCENARIOS

PUMP WILL NOT START

Cause	Solution
Air valve assembly malfunction / seizure	Check carrier for freedom of movement. Clean, oil and replace.
Obstructed fluid line	Clean line or increase line size.
Obstructed diaphragm chamber	Remove obstruction
Diaphragm failure causing fluid and excessive air to be expelled through the exhaust	Replace diaphragm
Diaphragm seal failure	Replace shaft seals
Air valve system malfunction	Check all seals in valve chest assembly
Air connected to exhaust	Re-connect to air inlet

ERRATIC FLOW

Cause	Solution
Diaphragm failure on one side	Replace diaphragm
Valve ball not seating	Check and remove obstruction
Suction leakage	Check and correct
Diaphragm failure causing fluid and excessive air to be expelled through the exhaust	Replace diaphragm
Diaphragm seal failure	Replace shaft seals
Air valve system malfunction	Check all seals in valve chest assembly

PUMP STROKES BUT WILL NOT DISCHARGE

Cause	Solution
Excessive suction lift	Shorten suction line
Suction line leakage	Check and correct
Valve ball not seating correctly or damaged	Check and remove obstruction / replace
Suction line or strainer clogged	Clear
Diaphragm failure	Replace diaphragm

FLUID DISCHARGED FROM AIR EXHAUST

Cause	Solution
Diaphragm failure	Replace diaphragm
Loose frontplate	Re-torque to manual specification

INTERMITTENT STROKE RATE

Cause	Solution
Over lubrication	Shut down pump. Remove air connection into pump and introduce a small quantity of de-greasing agent into air valve and replace line. Run pump until clear.
Diaphragm shaft seal failure	Replace seals
Air valve system malfunction	Check all seal in valve chest assembly
Valve ball not seating / partially obstructed	Clear obstruction

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