3NBB-390/15 Mud Pump Structure Features Horizontal triplex single-acting piston pump Herringbone gear transmission, low transmission noise, no axial force, more durable bearings Oversized crankcase design, crank bearings which the models are the same as large mud pumps ensure the pump keep durability for long time under high pressure condition. Adopting API specs, frame in welding structure, light weight, large strength. L-shaped forging pump head, retaining the advantage of easy to replace the wearing parts, improving pressure-resistant and safety of pump head , eliminating phenomenon of casting pinhole. 6. No liner gland, no sealing problem. Rear-mounted liner structure (bi-metal liner) which is easy to assemble and disassemble The connection of pull rod adopts international advanced technology, which makes piston replaced conveniently. The auxiliary time is 70% shorter than normal mud. Five-speed gearbox, you can adjust the flow rate at will Main Technical Parameters Piston Stroke （mm） 140 Cylinder Liner Dia （m） Φ100 ID of Suction Pipe (mm） Φ102 ID of Discharge Pipe (mm） Φ50 Rated Pump Speed （Num/min） 130 85 53 30 18 Rated Flow Rate （L/min） 390 250 160 90 52 Rated Pressure (MPa) 8 　11 Max Pressure (MPa) 9 12 　15