Drilling process, the drilling mud or water in transmission fluid machinery. Drilling mud is an important part of the equipment. Are in common circulation drilling, it is to flush the media --- surface water, mud or polymer fluids in certain pressure, through high-pressure hoses, taps and direct-drill column drill the center hole at the bottom to to cool drill bits, cutting down the debris will be removed and transported to the surface of the goal.

Mud is a common type or plunger-type piston, driven by the power machine rotary pump crankshaft, crankshaft driven by the crosshead and then the plunger in the pump cylinder piston or reciprocating motion to do.
Suction and discharge valves in alternation, to achieve pressure fluid delivery and recycling purposes.