Spring Return - Type B Hydraulic Diaphragm

Series SR - Type B - Hydraulic diaphragm dosing pump

"B" type hydraulic diaphragm metering pumps are suitable for use when the liquid to dose contains small suspended solids, when high pressure is required and when piston lackage are not accepted. The gearbox is a standard wormwheel reduction system coupled with a vertical mounted B14 shaped electric motor in accordance with UNEL-MEC specification. The mechanism for variation of the stroke length is a positive stroke spring return operated by an eccentric. Stroke adjustment can be done manually, electrically (4-20mA; Profibus) and pneumatically. Different multiple head units are available on request. All the series can be ATEX certified.


Max. Capacity

Max. Pressure


108 Lt/h 20 Bar


418 Lt/h 20 Bar


1068 Lt/h 12 Bar


Some standard execution 41 43 29
Pump head S.S.316 PVC PP
Piston S.S.420 S.S.420 S.S.420
Piston gasket AU/NBR AU/NBR AU/NBR
Oil chamber All. All. All.
Valve seat S.S.316 PVC PP
Valve ball S.S.316 PYREX PYREX