STAUFF Pumps says customers should develop an understanding of the design of their slurry pumps before comparing different makes.
According to Stauff Pumps, the three most critical aspects are pump displacement, the type of hydraulic drive and the pressure spike control.
Stauff Pumps says some simplistic hydraulic controls are basically valves that switch from one hydraulic cylinder to another at the end of each stroke. Slurry pressure spikes can be high even if pumps incorporate pressure limiting devices to partially control pressure peaks.
According to Stauff Pumps, closed loop hydraulic drives can provide a smooth transition from inlet stroke to discharge stroke on each cylinder. Furthermore, the ramp rate can be changed for optimum system operation.
Stauff Pumps claims the higher capital cost is offset by smoother operation and lower maintenance costs.
According to Stauff Pumps, it supplies a range of Putzmeister pumps, which feature the ‘Pressure Constant Flow’ (PCF) control system.
Stauff Pumps claims this PCF control is probably the smoothest system of all. It features a fast inlet stroke and a slower discharge stroke. While one cylinder discharges, the other cylinder fills and starts its discharge stroke.
Stauff Pumps says the wear rate is lower at any given flow compared to pumps without PCF. Furthermore, virtually no pressure spikes occur. Flow and pressure in the discharge line are almost constant and damper is not required.
The PCF control is also used with all Putzmeister triplex pumps. According to Stauff Pumps, at any given time, two cylinders are discharging, meaning that a triplex pump with PCF control delivers more flow per displacement at any given piston discharge speed.
In addition, one cylinder can be isolated for maintenance, while the pump operates with two cylinders.
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