Kromschroder Gas regulating valve S11T 20R01S 34157020

Kromschroder Gas regulating valve S11T 20R01S, SKU 34157020, is a gas valve with a nominal diameter of 20 mm and a connection thread of Rp 1/2. It is CE certified. This valve is designed for thermoelectric protection in gas burner systems, operating without external power supply to shut off gas flow in case of flame failure. It is suitable for use with natural gas, town gas, and liquefied gas (LPG).

Parts of this type are selected by matching the connection size (typically Rp 1/2" to 2" or flanged), coil voltage (common options include 230 V and 24 V AC/DC), and required function (e.g., single or double solenoid, slow-opening, servo regulation). Before ordering, verify the electrical specifications and connection size of the original part. The valve may be installed with a compatible burner control and gas pressure switch in a standard gas-fired heating system.

Common failure modes for this type of valve include coil burnout, leaking seat, drifting outlet pressure, or a seized servo regulator. When these occur, the equipment may fail to ignite, shut down unexpectedly, or exhibit unstable gas flow. Check the coil for continuity, inspect the seat for debris or wear, and verify outlet pressure against specifications.