The valve seat bores have a bottom shoulders to prevent the sinking of the valve seat. The pistons and cylinder sleeves are spray lubricated and cooled, which allow an extended service life.

Model | 3NB500 | 3NB1000 | 3NB1300 | 3NB1600 |
Input Power kW (HP) | 368 (500) | 735 (1000) | 956 (1300) | 1176 (1600) |
Strokes per minutes, pm | 95 | 110 | 120 | 120 |
Piston stroke, mm | 254 | 305 | 305 | 305 |
Gear ratio | 3.82 | 3.833 | 3.81 | 3.81 |
Speed of driving, shaft r/min | 363 | 423 | 457 | 457 |
Max. working pressure, MPa | 28.9 | 34.5 | 34.5 | 34.5 |
Hydrostatic test pressure, MPa | 43.4 | 51.7 | 51.7 | 51.7 |
Valve specification | API 6 | API 6 | API 7 | API 7 |
Max .dia of cylinder sleeves, mm | Φ160 | Φ170 | Φ180 | Φ190 |
Dia. of suction pipe, mm | Φ254(10) | Φ305(12) | Φ305(12) | Φ305(12) |
Dia. of discharge pipe, mm | Φ100(4) | Φ100(4) | Φ100(4) | Φ100(4) |
Overall dimension(LxWxH), mm | 4220x2640x2430 | 5170x2809x2530 | 4400x2998x2565 | 5100x3037x2615 |
Total Weight (without sheave,) kg | 15940 | 21450 | 24800 | 26000 |

Our company specializes in manufacturing petroleum machinery for the oilfields, metallurgy, mining, coal chemical industry and new energy development industry. Main products are triplex single acting mud pump, triplex tunnel filling pump, triplex pump for tailings, diaphragm pump for water, coal and mud separating (this pump will fill the domestic gaps and take place of importing ) and generator set from coal and biogas.
Our pumps have a presence in more than 50 countries and regions in the world, covering North America, Latin America, Russia and Central Asia, the Middle East, Asia Pacific, Europe and Africa.
