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GEHO - Model ZPR -Crankshaft Driven Piston Pumps
The GEHO ZPR pump is a crankshaft driven one or two cylinder double-acting piston pump. Low and moderately abrasive slurries are economically handled by these crankshaft driven piston pumps. Compared to mud pumps and plunger pumps the piston pumps are operated at moderate stroke speeds to optimize wear part performance. The ZPR pump range is developed and manufactured by Weir Minerals Netherlands b.v.
- capacities up to 145 m3/h
- pressures up to 40 bar
- medium viscosities up to 8.000 cP (mPas)
- moderate abrasiveness
- mild corrosiveness
- up to 8mm particle size
- up to 75% solids content
The principal difference to the model TZP is the double-acting piston, while the TZP does not use a stuffing box. The capital expenditure of this piston pump is substantially lower than that of an equivalent size diaphragm pump and offsets the piston and liner (wear) parts usage when pumping mildly abrasive slurry and/or moderate pressure.
The modular design shares the power end, the valves and pulsation dampener with the extensive range of GEHO piston diaphragm pumps. As a result Weir Minerals Netherlands can economically meet any flow sheet and duty requirement with either a GEHO piston or a piston diaphragm pump.
The design distinguishes itself from a so-called mud pump and from a flushed-plunger pump in that the stroke is longer, the stroke rate is lower, it utilizes genuine slurry valves and all power end components have an inherent long wear life, even when the speed varies over a wide range.
The power end with cast frame transmits energy via an external V-belt drive and an internal gear reducer to the pistons by means of a forged steel, direct driven crankshaft, cross heads with replaceable guides and connecting rods. Clamp couplings and a special tool facilitate the removal of the piston and liner. Ceramic lined and hard surfaced liners are available to prolong the liner wear life.
A piston guide ring centres the cup seal in the liner. Spray flushing of the liner bore further reduces friction and wear. The poppet (check) valves are readily accessible for maintenance with oil-hydraulic release of the tapered cone valve seat.