ScopeShoe press / extended-nip press (long-nip dewatering)
SystemHPU + shoe assembly + lubrication metering manifold
1 · Equipment Overview
| Function | Long-nip, high-load dewatering for higher dryness. |
| Types | Open / closed; hydrodynamic / hydrostatic shoes. |
| Circuits | Tank · filtration · HP circuit · lubrication · de-aeration. |
| Oils | ISO VG 220 in-roll, ISO VG 150 shoe/unit. |
2 · Maintenance Process
Shutdown & depressurizeStop, depressurize, sample oil; record level and temperature.
Hydraulic unitInspect tank, filter elements, breather; tighten piping joints.
Shoe inspectionCheck shoe / piston assembly, pivot strips, inclined springs.
Seal renewalInspect and replace piston / bronze seals.
Valve verificationCalibrate equalising, proportional and unloading valves; relief valves annually.
Lubrication calibrationCalibrate manifold header pressure. ≈ 100 psi
Oil treatmentBypass filtration / dehydration; top up by grade — never mix brands.
Pressurise & loadBuild nip pressure; staged loading test.
Curve verificationVerify nip pressure curve against load setpoints.
Trial runCheck internal / external leakage, oil temperature and flow.
3 · Key Process Photos
4 · Acceptance & Handover
Nip loading stable at setpoint; no internal/external leakage; oil temperature and level normal; high-pressure flow in range; nip pressure curve within tolerance; manifold lubrication pressure to target.