Schwing provides more than 10 kinds of self-priming full-hydraulic controlled double-cylinder piston pumps with different sizes and different cylinder diameters and strokes. We offer two control systems. One is the smooth poppet valve system, and the other is the patented Schwing rock valve.With our basic model, we can create more than 100 sludge pump models. This allows us to make the best adjustment to the transmission speed and pumping pressure.