Kromschroder Gas solenoid valve VAS2T-/NQSR 88003768

The Kromschroder VAS2T-/NQSR gas solenoid valve (SKU 88003768) is a quick-opening, quick-closing valve with flow adjustment, designed for safeguarding and controlling air and gas supply in gas burners and appliances. It features a nominal diameter range of 10–65 mm, with threaded connections (Rp or NPT) and flanged connections for DN 40 and DN 50. The valve operates at a supply voltage of 120 V, 50–60 Hz, with a maximum inlet pressure of 500 mbar. It includes two screw plugs on each side and weighs 3.565 kg. Certified to EN 13611 and EN 161, it complies with the Gas Appliances Directive 2009/142/EC.

Parts of this type are selected by matching the nominal diameter, connection type (threaded or flanged), and valve size to the existing piping and mounting configuration. Ensure the supply voltage and frequency align with the system's electrical supply. Verify the maximum inlet pressure rating meets or exceeds the system's operating pressure. The valve size (e.g., 2) and flanged connection dimensions (DN 40 or DN 50) must correspond to the pipe flanges. Before ordering, compare the connection thread (Rp or NPT) and the presence of auxiliary ports (screw plugs) with the original valve.

Common failure modes for gas solenoid valves include coil burnout, sticking due to debris, or diaphragm wear, leading to failure to open or close properly. Symptoms may include burner ignition failure, gas flow interruption, or inability to shut off gas supply. Check for continuity across the coil, inspect for debris or corrosion on the valve seat, and verify the valve opens and closes with the applied voltage. Also, listen for unusual buzzing or clicking sounds indicating mechanical issues.