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.
Based on type of connection, Butterfly Valves are broadly categorized in below types:
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.
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 Valves are available in 3 Modular Versions:
Butterfly Valves are designed in such a way that they need minimum maintenance. The gears are suitably lubricated and maintenace free. The gear units must be handled with care and the position indicator must be examined during the opening and closing valve operation, at periodic intervals. One must take into account that higher gear ratios will damage the gear units. Furthermore, after active operational use, the valves should be fully closed and opened at least once every six months.
According to the application and fluid/gas type, necessary precautions must be taken in the event of cleaning, inspecting, repairing or replacing a valve. Necessary precautions include draining the pipeline entirely, depressurizing and deactivating. The pipeline must be depressurized and then valves, gear units and bearing caps can be safely removed. Assigned experience personnel should solely be responsible for maintenance & repairs.
Around the working facility, in necessary spaces, warning signs should be placed. Prior permits must be obtained from the concerned management staff and thereafter the maintenance/repairs should be carried out. All necessary safety equipment, work boots, helmets, belts, goggles, gloves, insulation materials, etc. should be readily available and used.
Before Purchasing a Single Flap Butterfly Valves/Damper
IAPL Butterfly Valves boast of:
Why IAPL BFV/BFD?
IAPL's modular product range serves this dynamic flow control industry and offers compatibility, efficiency, quality performance at a cost effective price. Over a period of more than two decades, we have gained tremendous field application experience and through research & development we continue to design and execute products and services that will meet the stringent requirements of the present day flow control systems. IAPL has rightfully earned a reputation for excellence by creating products of high quality, offering tailor-made customer service and reiterate timely deliveries. Our success has stemmed from our fully integrated three versions of valve namely bare shaft, manually operated and motorized. These versions are designed and engineered such that they are rugged, reliable and offer hassle- free operation/service.