LEWA process diaphragm pump drive units LDF and LDG

The new LEWA variable eccentric pump drive types LDF and LDG
are closing the loop to LEWA process diaphragm pumps.

Method of operation

The drive shaft turns the eccentric via the worm gear and the hollow shaft. The connecting rod converts the rotary motion of the eccentric into a reciprocating motion of the plunger rod. The stroke length for the displacer movement is set (with the pump stopped or in operation) through radial shifting of the eccentric. For this the sliding shaft is axially shifted via the adjusting spindle. The axial movement of the sliding shaft is converted into a radial movement of the eccentric via the skew-slotted groove in the hollow shaft.



Advantages/Features:

• Stroke adjustment: available with fixed stroke length or with stroke length adjustment, setting of stroke length is carried out manually or electrically
• Linear stroke adjustment in steps of 0,05 mm via hand wheel while pump is stopped or in operation, proven variable eccentric drive principle, that means stroke length is adjusted where it arises: at the eccentric
• Multiplex drive units also in different frame sizes with motor mounted horizontally, common oil bath without radial shaft seal ring between the drive units (thus less wear parts)
• Harmonic plunger motion also at partial stroke
• API 675 specification is met
• Differing stroke rates make it possible to meet requirements for different fluids and process conditions
• Long life due to solid construction, best materials, oil bath lubrication, weather- and splash protection
• Simple operation, easy maintenance