Sit 0974401 مفتاح

This is a Sit 0974401 interruptor, catalogue article 900.801.001, also referenced as manufacturer code 0.974.401. It belongs to the Gas valves category. Parts of this type shut off and meter the gas supply to the burner. They open on command from the burner control and only when the gas pressure switch permits. In premix boilers a pneumatic gas/air link ties such valves to the fan. When selecting a replacement, key parameters include the brand and series, connection size (typically Rp 1/2" to 2" or flanged), coil voltage (230 V or 24 V AC/DC), and the function (single/double solenoid, slow opening, servo‑regulated, multiblock with filter and regulator). Common failures on valves of this class include coil burnout, leaking seat, drifting outlet pressure, and a seized servo regulator. The coil is often replaceable separately from the valve body, which may reduce replacement cost. Confirm the correct operating voltage and connection size before ordering a direct substitute.