Series SR type SD Spring Return Sandwich Hydraulic Diaphragm Pump
– The dosed liquid contains small amounts of suspended solids
– The dosed liquid is a toxic solution
– No leakage is accepted
A built-in safety valve is installed in the hydraulic circuit, in order to protect the diaphragm against overpressure.
The peculiarity of this pump is the special sandwich diaphragm and the reliability of the diaphragm rupture detection system.
Each pump has a standard gearbox reduction system and is available with an IEC B14 electric motor that meets UNEL – MEC specifications.
The motor power range is from 0.18 kW up to 0.75 kW.
There are many available options including different voltages, insulation classes, and special explosion-proof versions.
The reduction gearbox is of a standard endless screw plus worm-wheel type, supported by bearings, fully lubricated in an oil bath.
The mechanism for the variation of the stroke length is a positive fore-stroke, spring return type, that is operated by an eccentric.
| Model | Qmax l/h | Pmax barg |
| SD 125 N | 108 | 40 |
| SD 175 N | 418 | 40 |
| SD 250 N | 1068 | 20,7 |
