Spirax-Sarco 54663 4" Flanged Main Valve 125 PSI #25

The Spirax-Sarco 54663 4" Flanged Main Valve #25 is a fluid control part used in hydronic and steam equipment to control the flow of liquid or boiler through large bore piping in HVAC systems. It is mainly used to provide on/off control with the lowest pressure drop and operates with a full-port design that can withstand up to 125 PSI pressure drop. It requires the bolting of the flanged valve into the pipeline using proper gaskets and fasteners and an actuator or manual connection is required. It allows isolation and balanced flow control in boilers, chillers, and steam transfer systems.