Butterfly valves are useful quarter-turn valves that isolate and regulate the flow of a medium. The working principle of a butterfly valve is similar to the ball valves. These are rapid responding valves with just a quarter-turn and can move from completely open to close positions.

At Dutco Tennant LLC, we supply high-quality rubberlined butterfly valves for large-scale and ambitious projects. This product will also be exhibited for this year’s ADIPEC 2022 which will start from 31st October 2022.

In this blog, we will learn about the different parts of a butterfly valve. Keep reading till the end to find out the anatomy of a butterfly valve.

Different parts of the Gate Valve

There are essentially six different parts of a gate valve. Each having a significant function to deliver. These are -

Body of the Butterfly Valve

The body is the part where it contains other varied parts of the butterfly valve. The body fits two of the pipe flanges and it has two of the common designs - lug-style body and wafer-style body.

The lug-style has protruding lug holes that are present on the external part of the valve’s body for its connection to the pipe. Whereas, the wafer-style design utilises bolt holes that run through the valve’s body for the connecting to the pipe.

Stem

Stem is one of the smallest parts of the butterfly valve, nonetheless, it is critical for carrying out the valve's function. The stem is responsible for joining the disk (another part of the valve) inside of the valve to the handle positioned outside. This allows the butterfly valve to deliver opening or closing operations.

Stems are available in two varied designs - wetted and non-wetted. The wetted designs are prone to be affected by corrosion and erosion as they don’t contain materials to safeguard them from these issues. The non-wetted designs are able to offer protection against the corrosive and erosive nature of the medium flowing through the line.

Disk

The Disk exists inside the body of the butterfly valve and it is responsible for controlling the fluid flow. It performs similarly to the balls or gates that are placed inside the ball valves.

The disk also has two types - Eccentric and Concentric. The eccentric disk has a slightly  complicated design compared to the concentric disk. The concentric disk includes a stem that goes through the centerline of the disk. Valves with concentric disks are used in low pressure applications. Whereas, the eccentric disk contains a stem that runs behind the centre line and is in the opposite flow direction.

The eccentric disk is among the parts of butterfly valve that has been designed initially for preventing contact between the disk and seal before complete closure of the butterfly valve. This design helps the valve to have a longer lifespan.

Other than these, there are three other parts which are seat, hand lever and gear.

If you are interested to know more about butterfly valves and get a chance to discover the best of butterfly valves suitable for the Oil & Gas industry then make sure to visit the Dutco Tennant LLC exhibit at the ADIPEC 2022.