Series SR type FM Spring Return Sandwich Hydraulic Diaphragm Pump
Mechanical Diaphragm pumps are suitable for the applications in which:
– the dosed liquid contains small amounts of suspended particles
– the dosed liquid is a toxic solution
– a drip-proof/airtight application is required
– high pressures are not required
Each pump is built with a standard gearbox reduction system and a vertically mounted B14 shaped electric motor in compliance with UNEL-MEC specifications.
Motors’ power is usually 0,09 kW with 4 poles: 3-phase 230/400 Volts 50/60 Hz, and single-phase 230V/50 Hz or 110V/60 Hz.
As the motors comply with UNEL-MEC specifications, there are many available options with different voltages, frequencies, and insulation classes, whereas explosion-proof versions are not allowed.
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; this makes the diaphragm move forward (discharging phase) for all the stroke length, while the spring in continuous tension causes the comeback of the diaphragm (suction phase.
| Model | Qmax l/h | Pmax barg |
| FM 050-30 | 14 | 10 |
| FM 050-50 | 47 | 5 |
