ACV Gas valve 537D4038

The ACV Gas valve 537D4038, type designation 0.840.040, is an OEM gas control component for ACV boilers. It regulates and blocks gas supply, supporting dual-stage burner operation. This valve is compatible with ACV Prestige Excellence 50, HeatMaster 100 TC, and Delta Pro S 40 models. The coil is replaceable separately from the valve body.

When selecting a gas valve of this type, verify that the brand and series match the original, check the connection size (typically Rp 1/2" to 2" or flanged), coil voltage (commonly 230 V or 24 V AC/DC), and required function (e.g., single or double solenoid, slow-opening, servo-regulated, or multiblock). Ensure the gas pressure switch and burner control are compatible with the valve's operating parameters.

Typical failure modes for gas valves of this class include coil burnout, leaking seat, drifting outlet pressure, or seized servo regulator. When such failures occur, the burner may fail to ignite, lock out, or exhibit unstable flame. Check the coil continuity, valve seat sealing, and outlet pressure regulation.