Radial Piston Pump Radial Piston Pumps can produce a very smooth flow under extreme pressure. Generally they are variable-displacement pumps. Output can also be varied by changing the rotation speed. If it is moved even further to the left the flow would reverse.
Output is through the top two black holes, above the pintle.
Higher pressure areas are indicated with a lighter blue fluid color. The pistons are usually forced out by springs. They are forced back in, expelling liquid, by the casing. An odd number of pistons is always used to smooth the hydraulic balance. Note similarities to, and differences from, the wobble pump , swash plate pump , and bent axis pump .