TypesOf Piston Pump

         a)Single Acting Piston Pump
         b)Double Acting Piston Pump
         c)Axial Piston Pump
         d)Radial Piston Pump

a)Single Acting Piston Pump
       Having liquid chamber on only one side of the piston and valve arrangement on that side only. The liquid is discharged from one side of the cylinder once in a crankshaft cycle, only in the forward stroke of the piston.
b)Double Acting Piston Pump
        Both sides of the piston have liquid chamber and the valve arrangement. Liquid is discharged from both the sides, from one side in the first half of the cycle and from the other side in the second half of the crankshaft cycle. As the liquid is discharged in both the forward and backward stroke, the discharge is more per cycle and also smooth as compared to the Single Acting pump.
c)Axial Piston Pump:
        Axial piston pump many designed with a variable displacement mechanism, to vary output flow for automatic control of pressure. There are various axial piston pump designs, including swashplate (sometimes referred to as a valveplate pump) and checkball (sometimes referred to as a wobble plate pump). The most common is the swashplate pump. A variable-angle swashplate causes the pistons to reciprocate.