What's the difference between a butterfly valve and a gate valve?

Butterfly valves and gate valves are both very popular options for on/off flow control, but they are very different in terms of design, operation, and application. With a gate valve a wedge that is called a gate moves out of the flow path in a direction that is perpendicular to the flow, resulting in very minimal pressure drop when it is fully open. However, it is more slow in operation, bulkier, and higher priced. By contrast, a butterfly valve is a rotating disc mounted on a shaft, with a simple 90-degree a turn opens or closes the valve. Butterfly valves are lighter, faster-acting, more compact and more cost efficient – suitable for large diameter piping systems where space and weight are critical. Gate valves are most suitable for applications where tight shutoff is required for longer durations, while butterfly valves are more suited for applications involving frequent operation and throttling.

The connections Types and materials for the butterfly valves are pretty much varied according to working condition. Lug Type Butterfly Valve-Expertly designed and tested for prevention of leakage the lug type butterfly valve can be fitted between two flanges upper & lower with two sizes of nuts known as lugs, which can be installed without nuts, allowing for the hexagonal nuts to be placed on one side of the flange, permitting dead end present service. What is Flange Type Butterfly ValveDuctile Iron FPT UB Flame Lighter Poppet Valve With Ductile Iron Flange Type Butterfly Valve and Stainless Steel Flange Butterfly Valve plan to high pressure, long wear resistant service feat strong solutions. Double Flanged Butterfly Valve​ The Double Fladed Butterfly Valve is suitable for wider applications and particularly for large size cooling water in industrial pipelines. For the fire protection, there are the below options: Wafer Butterfly Valve for Fireproof Fire proof Wafer Butterfly Valve Ductile Iron Fire-Fight Wafer Butterfly Valve Cast Iron Fireproof Wafer Butterfly Valve Red Color Painted Cast Iron Fireproof Wafer Butterfly Valve​ is machined to meet related safety standards. Grooved-end models such as Grooved type butterfly valve, Ductile Iron Grooved Type Butterfly Valve, Ductile Iron Grooved Type Butterfly Valve ASTM A536, Rubber CoatedGrooved Type Butterfly Valve, Handle Grooved End Butterfly Valve and Grooved End Butterfly Valve in Soft Seat and Lever Operator​ can simplify the assembly of mechanical pipe system.