Butterfly Valves

Butterfly valve is from a family of valves called quarter-turn valve. Operation of Butterfly Valve similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they cost less than other valve design, and are lighter weight so they need less support. The disc is positioned in the center of the pipe. A rod passes through the disc to an actuator on the outside of the valve. Rotating the actuator turns the disc either parallel or perpendicular to the flow. Unlike a ball valve, the disc is always present within the flow, so it induces a pressure drop, even when open.

1.Wafer-Style Butterfly Valve

2.Lug-Style Butterfly Valve

Both lug and wafer butterfly valves are used in a number of applications for industrial sectors that include food processing, pharmaceutical, chemical, oil, water as well as waste water management.

 

1.Wafer-Style Butterfly Valve

The wafer style butterfly valve is designed to maintain a seal against bi-directional pressure differential to prevent any backflow in systems designed for unidirectional flow. It accomplishes this with a tightly fitting seal; i.e., gasket, o-ring, precision machined, and a flat valve face on the upstream and downstream sides of the valve.

 

Image result for Wafer-Style Butterfly Valve                    Image result for Wafer-Style Butterfly Valve

 

Wafer-Style Butterfly Valve Range

Size : 2”~40”(DN50~DN1000)

Rating : PN10, PN16, ANSI 150LB

Body Materials : Stainless Steel, Cast Steel, Cast Iron, Ductile Iron, Nickel Aluminun Bronze(Ni_Al_Bronze) etc.

End Connection :ASME B16.5, ASME B16.47, Wafer sandwiched

Operation : Lever, Gear, Pneumatic/Hydraulic/Electrical Actuator

 

2.Lug-Style Butterfly Valve

Lug-style Butterfly valves have threaded inserts at both sides of the valve body. This allows them to be installed into a system using two sets of bolts and no nuts. The valve is installed between two flanges using a separate set of bolts for each flange. This setup permits either side of the piping system to be disconnected without disturbing the other side. A lug-style butterfly valve used in dead end service generally has a reduced pressure rating.

 

Related image                               Image result for A lug-style butterfly valve

Lug-Style Butterfly Valve Range

Size : 2”~36”(DN50~DN900)

Rating : ANSI 150LB~600LB

Body Materials : Carbon Steel, Stainless Steel, Alloy Steel, Duplex Steel

End Connection :ASME B16.5, ASME B16.47, Wafer Lugged

Operation : Lever, Gear, Pneumatic/Hydraulic/Electrical Actuator