Butterfly valves are used for isolating or regulating flow. The closing mechanism takes the form of a disk, situated in the valve body itself. Operation is similar to that of a ball valve, which allows for a quick shut off. Butterfly valves, however, are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support for installation is required. The disc is positioned in the center of the body, passing through the disc is a shaft connected to an actuator on the outside of the valve. This actuator could be a Lever, Gearbox, Electric, Pneumatic or Hydraulic actuator. Unlike a ball valve, the disc is always present within the flow, therefore a pressure drop is always induced in the flow, regardless of valve position.
There are different kinds of butterfly valves, each adapted for different pressures and different usage. The rubberlined butterfly valve, which uses the flexibility of rubber, has the lowest pressure rating, and is the most commonly used for many low pressure applications. The Double Eccentric butterfly valve, used in slightly higher-pressure and larger pipe systems, features an offset in the way the disc is positioned, which increases the valve’s sealing ability and decreases its tendency to wear. The Double Eccentric Butterfly valve can have a rating of up to 40bar. The valve best suited for high-pressure systems is the triple offset butterfly valve, which makes use of a metal seat and is therefore able to withstand a greater amount of pressure. Below listed are the types of butterfly valves that we manufacture. If you would like to know more or want to know which kind would best suit your system, get in touch through our contact page.