Features / Benefits

• capacities up to 550 m3/h
• pressures up to 250 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 ZPR is the single-acting piston. The TZP does not use a stuffing box. It reduces the number of wear parts and makes this design attractive to the handling of more abrasive slurry and higher pressure. 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. Technically speaking, the TZP range of pumps handles the same wide performance envelope. 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 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 from an external 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.