U
Unloader Valve (Pump)
Relieves pressure when spray circuit is closed.
Urea Tank Heater
A urea tank heater is used to prevent AdBlue (urea solution) from freezing in vehicles fitted with Selective Catalytic Reduction (SCR) systems. It supports reliable dosing by maintaining fluid temperature above its freezing point in cold conditions. Systems may use electrical heating elements or coolant-based heat exchange depending on vehicle design. Frozen urea can restrict…
Unloader Valve Assembly
Valve assembly protecting pumps from over-pressure. Automatically diverts flow back to tank when spray sections close.
Urea-System Freeze-Protection
Heating circuit keeping AdBlue lines above –11 °C. Ensures reliable SCR operation in severe winter conditions.
Unplanned Stop Log
Log of stops with reason codes.
Urea-Tank Level Sensor
Sensor monitoring AdBlue level for the SCR system. Prevents NOx-emission faults by alerting the operator before depletion.
Unplanned Stop Report
Form completed after any roadside stoppage detailing fault cause and rectification. Forms part of fleet reliability tracking records.
Urea‑SCR System
Aftertreatment reducing NOx on modern sweeper diesel engines.
Ultra-Low-Emission Zone Sticker
Identification sticker confirming vehicle compliance with ULEZ standards. Required for entry into many UK city centres.
Ultra-Quiet Fan Housing
Redesigned housing lined with acoustic foam to cut noise by up to 5 dB(A). Essential for sweepers operating in residential zones after dark.
