Kromschroder Non-return gas valve GRS25R 03150669

The Kromschroder GRS25R (03150669) is a non-return gas valve designed to prevent reverse flow of gas or air in gas systems. It is suitable for natural gas, air, and oxygen, and operates within a temperature range of -20 °C to +80 °C. The valve has a DN 25 connection with internal thread Rp, weighs approximately 1 kg, and is constructed from durable metal alloys. It is certified according to DVGW standards and is intended for use in industrial and commercial applications, including burners and boilers.

Parts of this type are selected by brand and series, connection thread or flange size, and coil operating voltage (typically 230 V or 24 V AC/DC). Ensure the new unit matches the existing pipe connection size and that the coil voltage is compatible with the burner control circuit. The valve body and coil should be from the same manufacturer series to guarantee correct fit and sealing.

Common failure modes include coil burnout from voltage spikes or overtemperature, leaking valve seats due to debris, drifting outlet pressure from a worn servo regulator, or a seized regulator diaphragm. When these occur, the equipment may exhibit unstable operation, reduced efficiency, or safety risks due to gas backflow. Check the coil for continuity, inspect the valve seat for debris, and verify the regulator diaphragm for damage.