| Media: | Gas, Water, Steam |
|---|---|
| Driving Mode: | Electric, Handle |
| Connection Form: | Flange, Weld, Wafer |
| Structure: | Centre Sealing |
| Seal Form: | Soft Sealing |
| Valve Stem: | Normal |
| Samples: |
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| Customization: |
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Butterfly valves are low-profile devices used in industrial processes. They are relatively thin, which means that they can occupy less space in pipelines than other types of valves. They also come in a variety of body styles, including wafer and lug.
Wafer-type butterfly valves are made of iron, which makes them more elastic and flexible than cast iron. They also offer a high level of chemical resistance. They also feature a lever handle for manual flow control. In addition to their low-flow capacity, they also provide a tight seal against two-way pressure.
This type of valve uses a tightly-fitted seal, i.e., an O-ring, to safeguard against bi-directional pressure. A wafer-type butterfly valve is easy to install but cannot be used as an isolation valve. If you need an isolation valve, you'll need to purchase a larger valve.
The butterfly valve body is a sturdy, rigid piece of metal that covers the internal parts. The seat covers the inner edge of the valve's walls and is the primary sealing agent. When the butterfly valve is closed, the disc lodges against the seat and the butterfly valve closes.
Wafer valves are a great choice for many applications because they are lightweight, compact, and are easy to install. They don't need expensive exotic materials, and they are also much more cost-efficient than other butterfly valves. However, the body and valve linings are often prone to wear and tear, which makes maintenance much more difficult. In order to properly maintain a wafer butterfly valve, you must shut down the entire pipeline.
When the butterfly valve is closed, the wafer aligns with the direction of flow. When the wrench is rotated back to its original position, the valve opens. As the commodity passes through the valve, the wafer is pushed into position. This prevents the commodity from getting stuck in the valve. The valve can be used in many different ways.
The difference between the two valves lies in the material used for the seat and disc. Lugs are generally made of ductile iron, while wafers are made from softer materials. When deciding between a lug and wafer butterfly valve, it's important to know what the application is and what flow media you will be using.
A lug butterfly valve features threaded inserts on both sides of the valve body. It's best suited for systems that feature two sets of bolts without nuts. To install a lug butterfly valve, you must position it between two flanges, one with an internal thread. Because of the lug design, you can easily disconnect the piping system after installation. A lug butterfly valve is less likely to have a spring or other internal mechanism that could cause a leak.
On the other hand, a wafer-type butterfly valve is used to protect against bi-directional pressure in the flow of fluids. It is designed to hold a tight seal to avoid any backflows in the system. This type of valve comes with a tight-fitted seal, i.e., O-rings, gasket, etc. This type of seal is used along with a flat face valve. It is composed only of fewer materials and is small and lightweight. It can be quickly opened and closed, which makes it perfect for various industrial applications.
| No | Part | Material |
| 1 | Body | ASTM A351 CF8 |
| 2 | Seal Ring | Graphite + SS304 |
| 3 | Retainer Flange | ASTM A182 F304 |
| 4 | Pin | ASTM A276 304 |
| 5 | Disc | ASTM A351 CF8 |
| 6 | Stem | ASTM A276 304 |
| 7 | Stem Packing | Graphite |
| 8 | Stem Beating | SS304 + PTFE |
| 9 | Bolt | ASTM A193 B8 |
| 10 | Nut | ASTM A194 8 |
| 11 | Yoke | ASTM A216 WCB |
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