Crane 21F-FRB Monarch Steel Wafer Butterfly Valve

Crane 21F-FRB Monarch Steel Wafer Butterfly Valve is a steel-bodied butterfly valve intended for inline installation in 4-inch piping, featuring a wafer-style design from Crane's Monarch line. The model identifier 21F-FRB denotes this specific valve, with a 200 rating noted in the product details, signaling its rated capacity for flow-control tasks within industrial systems. This valve uses a butterfly disc to regulate flow and provide shut-off in piping networks, and the steel construction supports use in environments where durability and resistance to typical process fluids are important. As a Monarch member, the 21F-FRB fits into Crane's family of industrial valves and is meant for general-purpose flow control in steel process lines and related utility piping, offering a compact option where space or weight considerations matter. Butterfly valves are used for throttling and isolation in piping systems, and the Crane Monarch 21F-FRB provides a 4-inch, steel-bodied solution for inline flow control in industrial settings.