It is used for conveying mud for drilling rig, emission of mine sewage and transporting water ... longer life .3.There are 5antidust sealed rings to prevent mud entering machine.4.Drain valve are made of steel ball ... relocation.styleTriplex single rolestroke10mmDiameter of cylinder80mm,65mmSpeed(chong/min)200,116,72,42,200,116,72,42Flow (l/min)250,145,90 ...