Siemens Building Technology 257-02056 Valve Assembly R-407C The brass trim and high-temperature

The brass trim and high-temperature packing are rated for fluid temperatures up to 284°F

Engineered for low energy consumption when paired with compatible bi-stable solenoid coils

With a physical length of 11

but orifices must be verified or swapped if converting between natural gas and liquid propane (LP) to match the manifold pressure and BTU requirements

preventing common localized failures like nuisance lockouts or short-cycling

Siemens Building Technology 257-02056 Valve Assembly R-407C The brass trim and high-temperatureThe Siemens 257 02056 is a professional grade 2 way normally open pneumatic valve assembly engineered for precise proportional control in heating and cooling applications. This 1 2 inch NPT x Union Male unit features a forged brass body and stainless steel trim, ensuring high durability and resistance to scaling in demanding hydronic systems. With a 2. 5 Cv rating and equal percentage flow characteristic, it provides stabilized heat output even under