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.

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Double Eccentric Butterfly Valves

Double eccentric butterfly valves, also known as high-performance butterfly valves, have the shaft mounted slightly offset from the pipe centerline, and the shaft is mounted behind the sealing band of the seat. The seat is a narrow resilient band, clamped in the body and must be resilient.

Rubber Lined Butterfly Valves

The rubber lined butterfly valve is a very common valve used in the water industry. Due to the low leakages and ability to withstand reasonably high levels of pressure and temperature, the rubber lined butterfly valve is known for its high reliablity and low maintenance.

Teflon Lined Butterfly Valves

The teflon lined butterfly valve is the latest style butterfly valves. Since the standard valve has a lined body and disc, it is capable of resisting attack from even the most corrosive of chemicals.

Triple Eccentric Butterfly Valves

Triple eccentric (offset) butterfly valves are used to prevent galling and scratches between the metal seat and the metal disc. Due to its unique design, the only time where the seal comes into contact with the seat is at the point of complete closure.