The concentric butterfly valve is a flow control valve that control the flow in line with the help of a rotary disc.The thin disc makes a small hindrance in the path of the fluid flow.But it is very economical than other valves. It is easy in manufacturing, smooth to operate and maintenance.In this design, wafer pattern is very lightweight so the cost is very cheap in manufacturing and easy to installation, handling. Due to these properties this valve become project cost and time saver.The common name of this series is as Centric or Concentric butterfly valve.The stem through the centre of disc with the help which the disc rotates quarter turn. It allows a smooth operation of open/close via lever/gear. The seat is moulded with the body so the fluid is not touch directly with the body material.It is also popular as a resilient-seated valve as it depends on the flexibility of the seat rubber.In this type of valve, the disk first interacts with the seat at about 85° for a 90° rotation. The concentric butterfly valves are widely used in low-pressure water applications.
Double offset butterfly valves are usuallyinstalled for high pressure and temperature. After centric disc design, it is one of the most demanded offset butterfly valves. There is a series of high- performance butterfly valves. It is a lightweight, compact and very economical.
In a high-performance butterfly valve the stem is out from the centre line. Due to which it is called offset high performance butterfly valve.
The offset design reduces the wear & tear due to friction and generate equal-distributed pressure on valve seat and disc.The butterfly valve also used for modulating flow control.This high-performance butterfly valves able to handle more viscous and corrosive fluids. It is widely used due to economical.The corrosive fluids such as gases, steam and oil. High-performance butterfly valves are mostly of large sizes. These valves are manufacture as per fluid and applications. High-performance butterfly valvesare designed to operate in a wide range of temperatures from -28° C to 500°C. The operator such as Lever, Gear, chain-pully gear, Electric, Pneumatic and hydraulic. It is an economical option of ball valves with quarter turn feature.This is the principle in which the handle is rotated for 90° degrees to open/close the valve as necessary.
Triple eccentric butterfly valves are introduced fifty years back as an economical option of high-pressure ball valve. It is now widely used in oil, gas & steam as critical process.The enhancement in design over the past few years made this Triple offset butterfly valves to be used in critical processes such as Oil & Gas industries.Triple offset butterfly valve offers a variety of advantages to the industries. It has ability to control the seat & back seat leakage due to tight shut-off.The special feature of back seat arrangement solves the problem of emissions of corrosive fluid
The Rotork Electric Butterfly Valve is composed of an electric actuator and butterfly valve, so it has the advantages of easy operation and simple structure. It is also widely used in chemical, pharmaceutical, and other industries.
