the Alco 056110 ensures consistent shut-off and minimal external leakage

8401-025BX is the cross of S8401-025

and NMQ series actuators

the internal bimetal disc is likely defective

matching the factory specifications for the A5-Z8410

Belimo B309+LRB24-3 Valve Assembly Refrigerant the Alco 056110 ensures consistentThe Belimo B309+LRB24 3 is a high performance 3 way characterized control valve (CCV) assembly engineered for precise hydronic regulation in demanding HVAC systems. This 1 2 inch NPT valve features a 0. 8 Cv rating and is constructed with a stainless steel trim (ball and stem) to ensure long term reliability in both chilled and hot water applications, including those with up to 60% glycol. The integrated LRB24 3 actuator delivers a robust 45 in lb