Belimo B211 Valve 320720-756 The Watts 909 series is

The Watts 909 series is known for its "no special tools" design

ensure the label is oriented at top center to prevent oil logging within the internal chambers

this factory authorized part ensures precise alignment and minimizes vibrational friction in critical HVAC replacement parts setups

replacing the discontinued TST30009

Belimo B211 Valve 320720-756 The Watts 909 series isThe Belimo B211 is a high performance 1 2 inch NPT 2 way characterized control valve designed for precision in HVAC hydronic systems. Featuring a 1. 9 Cv rating, this valve utilizes a specialized equal percentage flow characteristic, made possible by a built in Tefzel characterizing disc. This design compensates for the non linear heat transfer of coils, ensuring stable modulating control and preventing system hunting. The unit is constructed with a