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In a hydraulic gear pump, the Bushing Block (more commonly and accurately called a Wear Plate or Pressure Plate) is a critical component that serves as the sliding bearing surface for the gears and, most importantly, contains the high-pressure and low-pressure zones. Its primary functions are to seal the sides of the gears to prevent internal leakage and to support the axial loads generated by the system pressure.
Mechanical Property
| Brinell Hardness (HBW) | Tensile strength MPa | Yield strength MPa | Elongation % | Friction coefficient μ | Grain size class | |
| YHL 2.2 | 115-135 | ≥330 | —— | ≥7 | ≤0.07 | ≥7 |
| YHL 2.5 | 80-100 | ≥220 | —— | ≥8 | ≤0.05 | ≥7 |
| 6082 | ≥95 | ≥205 | ≥110 | ≥14 | ||
| 2014 | 125-150 | ≥485 | ≥415 | ≥13 |
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