December 05, 2025
A typical thermostatic valve kit for radiators usually comprises the following 2-3 main components, all finished with a coordinated white paint treatment:
Thermostatic Valve (Control Valve) - Core Control Component
Appearance: Angle valve or straight valve featuring a rotatable handwheel (typically white plastic).
Function: Installed at the radiator's inlet. Users manually adjust the hot water flow entering the radiator by turning the handle, thereby controlling its heat output and room temperature. This is the primary component for temperature regulation.
Shut-off Valve (Lock-off Valve) - System Isolation Component
Appearance: Typically features a decorative cap requiring a specialised key (hex key or custom wrench) for operation.
Function: Installed at the radiator's return inlet. Primary purposes:
System balancing and commissioning: During initial system operation, technicians use the key for fine adjustments to balance flow rates between radiators.
Isolation shutdown: When servicing or replacing a radiator group, this valve can be fully closed with the key without shutting down the entire heating system, thus not affecting heating in other rooms.
Theft prevention: In communal or rental properties, prevents unauthorised operation by users.
Air vent (typically manual or automatic)
Function: Installed on one side of the radiator top to expel trapped air (air locks), ensuring hot water fills the entire radiator for proper heat emission.
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