Walchem LK Series Instruction Manual

Contents

Walchem LK Series Instruction Manual Manual pdf 27 page image

24 Starting after the pump is stopped or out of use1. When the pump is stopped for a short period of time (within a week), it can be re-started atits prescribed pressure and capacity.2. When the pump has been out of use for a long period of time, operate the pump at zeropressure for a few minutes to lubricate it thoroughly. Do not start the pump at a prescribedpressure immediately. Pulsation dampenerIt is always recommended to install a pulsation dampener, i.e. diaphragm type accumulator, airchamber, etc. Because a metering pump is a reciprocating device, it produces pressure pulsationsthat the system sees in the form of acceleration, inertia, shock, noise, and reduced service life.When the piping is long, it is especially important to use a pulsation dampener for accuratemetering.11 TroubleshootingItem Problem Ref. No. forCause/CountermeasureA Discharge capacity is low. 1, 2, 4, 5, 6, 7, 8, 9, 11, 12B Discharge capacity is excessive. 3, 7, 9C Discharge capacity is unstable. 1, 2, 3, 4, 5, 7, 8, 11, 12D No liquid is discharged. 1, 2, 4, 7, 8, 11, 12E Discharge pressure does not increase. 1, 2, 4, 8, 10, 11, 12F Pump will not prime. 1, 2, 4, 5, 6, 7, 8, 12G Liquid leaks. 5, 6H Motor does not run. 15, 16, 17, 18, 19I Motor draws excessive amperage. 13, 15, 16, 17, 19J Excessive vibration and loud noise. 8, 12, 13, 15, 19K Oil leaks. 14L Gearbox temperature is excessive. 7, 13, 19Ref. Cause Countermeasure1 Foreign matter is clogging valve ball, valve seatand/or valve guide.Disassemble and clean.2 Valve seat and/or valve ball is worn. Replace.3 Differential pressure is inadequate. Install a back-pressure valve in discharge line. (5PSI is required as min. differential pressure.)4 Air leaks into suction line. Inspect suction pipes and connections. Re-tighten.5 Defective valve gasket or O-ring Replace.6 Damage to diaphragm Replace. Check the discharge pressure forforeign matter or crystallization in the pumpchamber if it fails prematurely.7 Pumping condition (liquid, temperature,pressure, piping, etc.) changes.Renew pump performance data of the alteredpumping condition after confirming that thepump is good.8 Suction pipe or strainer is clogged. Disassemble and clean.9 Stroke length dial has moved. Readjust and tighten lock bolt securely afterconfirming that no liquid is discharged at strokelength of 0%.