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Butterfly Valves

These quarter turn valves are easy to operate and fast to open. The 90 degree rotation of the handle provides a complete closure or opening of the valve port that is used to stop, regulate, and start the flow. Normally, they are used in systems where positive shut-off is not required.

Butterfly valves is an essential aspect of several diverse industries namely pharmaceutical, chemical and oil, food, water supply, wastewater treatment, fire protection, gas supply, fuel handling.

Butterfly Valve Types

Based on type of connection, Butterfly Valves are broadly categorized in below types:

  • Wafer-style Butterfly Valve
  • Lug-style Butterfly Valve
  • Double Flanged Valve
  • Rotary Valve

 

The wafer body is placed between pipe flanges, and the flange bolts surround the valve body. A wafer type butterfly valve is easy to install. This tight seal is attained by using a o-ring, gasket. The wafer body is placed between pipe flanges, and the flange bolts surround the valve body.

The lug-style 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. Further, it is not essential to close down the complete gas system to clean, inspect, repair or replace a lug type butterfly valve. They are usually used as end-of-line service or pipe ends. They have lower bolt torque ratings than wafer type.

The double flanged butterfly valves serve the main purpose of regulation and shut-off in bigger pipelines. These valves possess regular face to face flanged connection that help in perfect alignment of valve in between pipelines or gate valves, as necessary. These valves are designed for bi-directional flow, with a gasket seal setup on the main disc that permits there replacement without dismantling the valves from the pipeline. They are extensively used in drinking water applications.

The rotary type butterfly valve falls in the category which caters to powder processing industry. The inner part, instead of being flat, it contains pockets. When the valve is shut close, it acts like a normal butterfly valve. However, when it is in operation, the pockets permit the discharge a specific amount of fine-grained solids, powdered bulk or granular materials. Each pocket takes in solid material from the inlet opening and drops it at the outlet opening that results in a volumetrically continuous flow of the material. Thus, this valve is suitable for dosing bulk solids by gravity. These types of valves are commonly of small size and operated pneumatically. They are usually placed above mixers, driers, and mills in order to volumetrically feed bulk materials into continuous mixing and processing processes.

Gas Butterfly Valves

Several gas fired applications demand a control device just before the burner, a device that will regulate the gas flow and that would suit the inlet of the burner. A quarter turn butterfly valve serves this purpose.

It consists of a metal disc mounted on a shaft along its diameter. That constitutes the "butterfly' in its name. Butterfly Valve operation is similar to ball valve operation. When the valve is in closed condition, the disc is turned so that it thoroughly blocks off the flow of fuel. When the valve is in open condition, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. Transitional rotations allow regulation of fluid/gas flow i.e. start, stop and regulate flow.

Butterfly Valve Modular Versions

Butterfly Valves are available in 3 Modular Versions:

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