Sit Gas valve 0.845.070

The Sit Gas valve 0.845.070 is a gas valve manufactured by Sit, categorized under gas valves. It is an OEM equivalent to the R10021021SIT and is designed for use in Electrolux boilers, specifically models GSB Basic 11/18/24, Basic S, Basic DUO 24/30, and Hi-Tech 24/28/32. This valve shuts off and meters the gas supply to the burner, opening on command from the burner control only when safe operating conditions are confirmed by the gas pressure switch. In premix boilers, it operates via a pneumatic gas/air link to the fan.

Parts of this type are selected by brand and series, connection size (typically Rp 1/2" to 2" or flanged), coil voltage (commonly 230 V or 24 V AC/DC), and function (single or double solenoid, slow opening, servo-regulated, or multiblock with integral filter and regulator). When replacing a gas valve of this class, check that the coil voltage and connection size match the existing installation. Ensure the replacement valve is compatible with the burner control sequence and any pneumatic gas/air linkage present in the system.

Typical failure modes include coil burnout, leaking seat, drifting outlet pressure, or a seized servo regulator. When such failures occur, the equipment may fail to ignite, shut down unexpectedly, or exhibit unstable burner operation. The coil is often replaceable separately from the valve body, which can simplify repairs. Check the coil continuity, valve seat sealing, and outlet pressure regulation to diagnose issues.