caleffi double drain safety device pkb20 The 3-way zone valves are

The 3-way zone valves are diverter valves with one inlet (marked on the valve body: AB) and two outlets (marked A and B)

Do not operate the device in humid or potentially explosive environments

such as the double thermal relief valve

NOx: 88 mg/m³

Maximum flow rate: 2

caleffi double drain safety device pkb20 The 3-way zone valves areCaleffi double thermal safety valve " opens at 90 100C Double thermal safety valve with built in refill for wood burning stoves and boilers with water jacket The double thermal relief valve is used as a safety device in heating systems with solid fuel heat generators. The device combines a thermal relief valve and a filling valve in a single unit, which are activated simultaneously with positive safety when controlled by a remote sensor. When the