QT450 Concentric Butterfly Valve, API 609, 4 Inch, 150 LB

Key Specifications / Features

The Ductile Iron Concentric Butterfly Valve, manufactured per API 609 standards, features a QT450 body for enhanced strength and durability. With a 4-inch (DN100) size and a Class 150 LB (PN16) pressure rating, the valve is fitted with an ASTM A351 CF8 disc for superior corrosion resistance and reliable performance. Its wafer end design ensures easy installation, while the lever-operated mechanism provides simple manual control and efficient flow regulation.

The Wafer Concentric Butterfly Valve is designed to maintain a seal against bi-directional pressure differentials, preventing backflow in systems intended for unidirectional flow. This is achieved through a tightly fitting seal, gasket, O-ring, and precision-machined components, along with a flat valve face on both the upstream and downstream sides. The valves are equipped with threaded inserts on both sides of the valve body, allowing for installation with two sets of bolts, eliminating the need for nuts. The valve is installed between two flanges, with a separate set of bolts for each flange. This configuration enables either side of the piping system to be disconnected without disturbing the other side.

Technical Specification

» Normal Size Range: 2-48 Inch (DN50-DN1200)

» Normal Pressure Rating: Class 150 LB, PN10, PN16

» Material: GG25, GGG40, ASTM A216 WCB, ASTM A351 CF8, CF8M, CF3, CF3M

» Optional Seatings: Resilient NBR, EPDM, VITON

» Operation: Handle, Handwheel, Pneumatic, Electric

» Temperature Range: -29°C to 120°C

» End Connections: Wafer, Lug, RF Flange

» Design and Manufacture Standards: GB/T 12228, API 609

» Face to Face (End to End): GB/T 12221

» Flanged Connections: ANSI B16.5, GB/T 9113

» Test and Inspection Standards: API 598, GB/T 13927