... (piston pump) are designed for transporting sludge (slurry), feeding to the filter press and spray- dryers.Principle: The plunger pump ... is installed, to work regularly.The plunger pump (piston pump) is, therefore, formed by two cylinders with porcelain piston, by suction and delivery ... valves, by an air tank and by a manometer, which is placed on the fluid delivery line to check the fluid ...