Pulsation in the standard pumping system is natural. It is produced when the plunger reaches the forward end of each stroke, at each point the fluid in the cylinder has been pushed out. The plunger must complete one complete revolution before that point is reached again, during that time span no fluid is flowing from that cylinder. This is what creates the pulse (simply put the flow from the pump is not constant).
Pulsation is very prevalent in a one-cylinder pump and smoothens out as the number of cylinders increases. This is due to an overlap of cylinders moving at one time. Below are curves showing how pulsation quiets with added cylinders.
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