Sit Gas valve 0.630.019

The Sit Gas valve 0.630.019 is a gas valve manufactured by Sit, categorized under gas valves. It is designed for use in Beretta AOGV 11-11K-17K boiler models. This valve shuts off and meters the gas supply to the burner, opening on command from the burner control only when the gas pressure switch confirms safe supply pressure. In premix boilers, a pneumatic gas/air link ties the valve to the fan, ensuring gas flow follows air flow. The valve is identified by SKU 0.630.019 and is part of the Sit 630 EUROSIT series.

When selecting a replacement for a gas valve of this type, key parameters to match include the brand and series, connection size (typically Rp 1/2" to 2" or flanged), coil voltage (commonly 230 V or 24 V AC/DC), and valve function (e.g., single or double solenoid, slow opening, servo-regulated, or multiblock). The coil is often replaceable separately from the valve body, which can reduce repair costs if only the solenoid has failed. Before ordering, verify the coil voltage and connection thread, and after installation, test the outlet pressure according to the burner manufacturer's specification.

Typical failures of gas valves of this type include coil burnout, leaking seat, drifting outlet pressure, and a seized servo regulator. When such failures occur, the equipment may fail to ignite, shut down unexpectedly, or exhibit unstable burner operation. To diagnose, check the coil for continuity, inspect the valve seat for leaks, and measure outlet pressure against the manufacturer's specification.