Caleffi 301 series valves are installed on panel style radiators. They are
connected to the bottom supply and return ports, providing fluid flow to
the upper thermostatic valve built into the radiator. The center-to-center
dimension is 50 mm, which is the common standard for all brands of
Two versions are available: Diverter style for one-pipe systems; Isolation
style for two-pipe systems. Both have two ball shut-off valves and come
as either a straight through flow pattern for floor connections or angled
flow pattern for wall connections.
The diverter style offers an adjustable by-pass to send 30% to 50% of
flow toward the radiator, factory-set for 35%. In addition, the diverter
style contains a unique thermal break device in the return side (right leg)
to prevent undesirable flow to the radiator due to thermo-syphoning
when the thermostatic valve is closed, no call for heat.
- Valve for panel radiators with built-in thermostatic valve unit.
- Two-pipe straight version (floor connections) fits 1/2" female radiator connections.
- Max working pressure: 150 psi (10 bar)
- Max working temp: 212°F (100°C)