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the 396021 is specifically designed for two-stage gas valves
Whether you are performing a professional repair or upgrading an existing unit
it supports direct-coupled mounting to both round and square damper shafts
Optimized Airflow: Precision-fit 15-inch design maintains the 320 to 500 CFM ratings required for system balance
Check the temperature differential across the valve
Schneider Electric (Erie) VS2221 Valve Body 320819-301 the 396021 is specifically designedThe Schneider Electric (Erie) VS2221 Valve Body is a robust 1 2 inch NPT two way assembly engineered for low pressure steam and hydronic zone control. Designed for high cycle performance in commercial HVAC systems, this brass zone valve body features a 1. 0 Cv flow coefficient, ensuring precise regulation of terminal units. It utilizes a two position, spring return operation when paired with compatible Erie PopTop actuators, simplifying field
