What is Wafer Butterfly Valve
Wafer-style butterfly valves often have only two or four non-threaded holes to keep them in place and align them with two mated flanges. A long bolt or threaded rod that passes through the two flanges of the wafer valve is used while using it. Holding the valve in place involves bringing the flanges together. Wafer butterfly valves are used to protect liquid flow against double-directional pressure differentials by maintaining a seal.
The wafer form of butterfly valves was invented to maintain a tight seal and defend against bi-directional pressure differential, hence preventing any backflow in systems designed for unidirectional flow. This is accomplished by using a valve face on the upstream and downstream valve portions, as well as a precisely machined O-ring or gasket.
Valve Body
Wafer-style butterfly valves often have only two or four non-threaded holes to keep them in place and align them with two mated flanges. A long bolt or threaded rod that passes through the two flanges of the wafer valve is used while using it. Holding the valve in place involves bringing the flanges together. Wafer butterfly valves are used to protect liquid flow against double-directional pressure differentials by maintaining a seal.
Stem
The butterfly valve stem can be made of two pieces or one piece with a shaft. The stem of the majority of robust sitting designs is protected from the media, allowing for an economical and mechanically advantageous material selection.
There are two distinct designs: wetted and non-wetted, based on the degree of protection offered by the stem. Unwetted stems are protected from any erosive or corrosive material that may be in the line. Since wetted stems are not protected against these, they must be made of a material that is compatible with the media that is passing through the line.
Disk
The media flow via the industrial wafer butterfly valve is controlled by a disc inside the valve. For the valve, either the eccentric or concentric disc can be utilized. Of these two, the concentric disk is the simpler. The disk’s centerline is broken by the stem in the concentric configuration. Constant-tension applications are widely used concentric valves.
However, the eccentric disc design’s stem follows the flow in the other direction, behind the center line. Originally, the eccentric disk was supposed to aid in preventing the disc and seal from connecting. Eventually, it was completely closed, which improved and prolonged the valve’s life.
Seat
The seat of a butterfly valve is composed of various elastomers or polymers and can be locked up, compressed, or glued to the body. The seat is situated along the valve’s inner diameter. When the disk seals and presses on the seat, the flow is stopped. These valves’ original design did not provide a tight, leak-free seal because the metal disc sat on the metal body. A tight and leak-proof seal will be facilitated by the valve’s design using elastomers or polymers.
Hand Lever
These parts, which are usually composed of steel, are tested for dimensional accuracy using salt spray, powder coating, and chemical treatment. Hand levers usually have a handle and a locking lever. Furthermore, they are usually used for small valves. These hand levers can be secured in their sealed, open, and partially open positions.
Gear
One more part on the list of wafer butterfly valve parts for manually operated ones is the gear. Some pieces are used for larger butterfly valves. While using a gearbox increases torque, it slows down opening and closing. Wafer butterfly valves with gear drives are irreversible and self-locking. They might still keep location cues, though.
How Does Wafer Butterfly Works
Wafer butterfly valves work similarly to other quarter-turn valves, and they are composed of many components. The most important is the metal disc. This metal disc is commonly referred to as a butterfly. The butterfly, which is mounted on a rod, stops liquid flow when the valve is closed.
When the valve is fully open, the metal disc or butterfly rotates a quarter of a turn. The path is unobstructed, allowing liquids or air to flow freely. The disc’s movement will depend on how the valve is opened or closed, whether fully or partially.
The disc would not spin through a full quarter revolution if the valve is only half open, which could prevent unobstructed passage. Thus, small amounts of liquids or air will pass through. If the valve is fully opened, the disc will rotate ninety degrees, allowing larger amounts of fluid or air to pass through.
Many more components make up the butterfly wafer valve. They are made up of the actuator, stem, packing, seal, body, and resilient seat. The sturdy seat is placed on the valve’s body to provide the best possible seal. The packing provides an additional seal in case the sturdy seat is damaged.
Industrial butterfly valves come in a variety of forms. Depending on the approach, some people work physically while others use electronics. They are also available from an industrial valve supplier in a variety of forms. Some provide outstanding performance in large pump lines and front suction.
