... , main drive system, transmission, double hoist group, mud pump, turntable, derrick, steel wire rope feed mechanism are installed ... mechanical seal sand pump, positive cycle IS150-125-315 water centrifugal pump, 2 bv5121 motor vacuum pump suction vacuum, positive ... /2 a horizontal reciprocating two-cylinder double-acting piston mud pump, through the pneumatic control clutch combination and separation ...