UP10-31H-0-N-80-30/28 CARTRIDGE

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The Hydraforce UP10-31H-0-N-80-30/28 (Material Number: 5621441.28) is a screw-in, cartridge-style remote sequence pilot unloading valve designed for accumulator-type hydraulic systems. This model features optional fixed unload/reload pressure ratios of 60%, 70%, or 80%. In its steady state, the valve blocks flow from port 2 to port 3 and shifts upon reaching a predetermined pressure at port 1, allowing flow between these ports. The spring chamber venting at port 3 means back pressure directly affects the valve setting on a one-to-one basis. If the pressure at port 1 falls below the established reload value, the valve closes to block flow again. The UP10-31 is robustly constructed with hardened spool and cage to ensure long life and features adjustments that prevent spring over-compression. It supports optional spring ranges up to 207 bar (3000 psi) and fits industry-common sizes. The UP10-31 has a pressure rating of up to 250 bar (3625 psi) at port 1 and supports flows up to 3.8 lpm (1 gpm). It operates efficiently within an internal leakage rate of just 0.1 ml/min from port 1 to port 2 at maximum pressure. The operating temperature ranges vary based on seal type: -40 to 100 \u00b0C with Buna N seals and -26 to 204 \u00b0C with fluorocarbon seals. The unit accommodates fluid viscosities between 7.4 to 420 cSt, maintaining performance under contamination levels up to ISO code level of 20/18/14. Installation requires a VC10-3 cavity with a cartridge installation torque between 34 and 37 N-m (25 to 27 ft-lb), ensuring secure fitting without orientation restrictions. The unit's wetted surface area varies by configuration but typically measures around either approximately either approximately either approximately either approximately either approximately either approximately either approximately either approximately either approximately around around around around around around around around around around depending on configuration depending depending depending depending depending depending depending depending configuration configuration configuration configuration configuration configuration configuration configuration on on on on on on on parameter parameter parameter parameter parameter parameter parameter parameters parameters parameters parameters parameters parameters parameters parametersparametersparametersparametersparametersparametersparametersparametersparameterparameterparameterparameterparameterparameterparameterparameterparameterparameterparametertheir their their their their their their their respective respective respective respective respective respective respective respective weight weight weight weight weight weight weight weights weights weights weightsweightsweightsweightsweightsweightsweightsweightsweightsweightweightweightweightweightweightweightweightweightweightandandandandandandandandinternalinternalinternalinternalinternalinternalinternalinternalsurface surface surface surface surface surface surfacesurfacesurfacesurfacesurfacesurfaceareaareaareaareaareaareaaareaaareaaareaaareaaareaininainainainanaaaaaaaaaccccccccccccccbbbbbblhhhhhhhhhhhffffffhhlhlhlhlhlhlhlhlhlllhlllhlllcm\u00b2cm\u00b2cm\u00b2cm\u00b2cm\u00b2cm\u00b2in\u00b2in\u00b2in\u00b2in\u00b2in\u00b2in\u00b2).