Piston assembly is the major part of the mud pump fluid end. The discharge pressure of mud pump is generated by the up-and-down motion of the piston in the cylinder. Small piston—high pressure and low flow rate; Big piston—low pressure and high flow rate. Metric pump and inch pump adopts metric piston and inch piston respectively.
Material: piston core 42CrMo; Rubber sheet: Buna-N rubber or polyurethane.
Metric piston parameters
| Specification |
Dimension "A" |
Dimension "B" |
Weight Kg |
| φ100 |
φ103 |
73 |
2.23 |
| φ110 |
φ113 |
73 |
2.69 |
| φ120 |
φ123 |
73 |
3.21 |
| φ130 |
φ134 |
79 |
4.49 |
| φ140 |
φ145 |
79 |
5.35 |
| φ150 |
φ155 |
79 |
6.11 |
| φ160 |
φ165 |
84 |
8.22 |
| φ170 |
φ175 |
84 |
9.05 |
| φ180 |
φ185 |
84 |
9.81 |
Inch piston parameters
| Specification |
Dimension "A" |
Dimension "B" |
Weight Kg |
| 4″ |
φ105 |
73 |
2.2 |
| 4-1/2″ |
φ117 |
73 |
3.17 |
| 5″ |
φ130 |
79 |
4.5 |
| 5-1/2″ |
φ144 |
79 |
5.38 |
| 6″ |
φ155 |
79 |
6.32 |
| 6-1/4″ |
φ163 |
84 |
8.31 |
| 6-1/2″ |
φ169 |
84 |
8.77 |
| 6-3/4″ |
φ175 |
84 |
9.43 |
| 7″ |
φ181 |
84 |
9.96 |
