Kromschroder Gas solenoid valve VAG1-/15R/NWBE 88000168

The Kromschroder VAG1-/15R/NWBE (SKU 88000168) is a gas solenoid valve with an integrated air/gas ratio controller, designed for modulating and step-controlled gas burners. It maintains a constant gas/air ratio of 1:1, with a control range up to 10:1, and gas outlet pressure following air pressure from 0.5 to 100 mbar. The valve has a nominal diameter of 15 mm (Rp 1/2 internal thread), operates at 230 V AC, and has a maximum inlet pressure of 500 mbar. It features a single solenoid, opening time of 0.5 seconds, closing time of 1 second, and is certified to EN 88 and EN 161, with EC, FM, and CSA approvals. Suitable for natural gas, LPG, and biogas, it operates in ambient temperatures from -20 to 60 °C and has IP65 protection.

When selecting a replacement gas solenoid valve of this type, verify the connection size (e.g., Rp 1/2) and thread type, coil voltage (AC or DC) and frequency, and the valve's function (single or double solenoid, slow opening, or servo-regulated). Ensure the maximum inlet pressure and ambient temperature range match the system requirements. The valve must be compatible with the gas type and the burner control system, and the mounting orientation should allow proper operation and access for pressure test points and position indicator.

Common failures of gas solenoid valves include coil burnout, leaking seats, drifting outlet pressure, and seized servo regulators. Symptoms may include the burner failing to ignite, unstable flame, or gas leakage. Check the coil for continuity and proper voltage, inspect the valve seat for debris or wear, and verify outlet pressure against the air pressure signal. If the valve does not open or close within the specified time, the solenoid or mechanical linkage may be faulty.