Owner manual

Installation/Operation Precautions
CAUTION: This pump should never be operated without liquid in the casing. It is recommended that run dry protection be used.
Optional electronic power monitors are available to help protect against run dry. If the pump has a PTFE or ceramic bushing,
IT CANNOT BE RUN DRY WITHOUT CAUSING DAMAGE TO THE PUMP. However, the pump can operate without liquid in the casing
if the pump has a carbon bushing. The exact length of time the pump can operate dry with a carbon bushing varies with operating
conditions and the environment.
CAUTION: Never start or operate with a closed suction valve. Never operate with a closed discharge valve.
CAUTION: Always provide adequate NPSHa (net positive suction head available). It is recommended to provide at least 2 feet (61
cm) above the NPSHr (net positive suction head required).
DB3, 4, 5 & 5.5 Capabilities
Maximum Working Pressure: 60 psi (4.1 bar)
Maximum Viscosity: 50 cP
Maximum Temperature: Polypropylene: 180º F (82º C); PVDF: 220º F (104º C)
NOTE: Maximum temperature is application dependent. Consult a chemical resistance guide or the chemical manufacturer
for chemical compatibility and temperature limits.
Solids: Maximum particle size is 100 microns for slurries and 1/64” (.4 mm) for infrequent particles. Maximum hardness is 80 HS.
Maximum concentration is 10% by weight. Pumping solids may lead to increased wear.
Minimum Allowable Flow Rate: Do not allow the flow rate to drop below the minimum flow rate listed in the chart below.
3450 rpm 2900 rpm
.25 gpm
(.95 lpm)
.95 lpm
(.25 gpm
Maximum Allowable Motor Power: Do not exceed the maximum power rating for the pump coupling.
Standard coupling for the DB3,4, and 5 is 4 pole. Maximum motor power is 1/4 horsepower (.18 kW).
Standard coupling for the DB5.5 is 6 pole. Maximum motor power is 1/2 horsepower (.37 kW).
Unpacking and Inspection
Unpack the pump and examine for any signs of shipping damage. If damage is detected, save the packaging and notify the carrier
immediately.
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