| Media: | Gas, Water, Steam |
|---|---|
| Driving Mode: | Manual, Electric, Hydralic, Pneumatic |
| 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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A soft seal butterfly valve is a type of butterfly valve equipped with a resilient seat material to provide a tight seal against the disc and valve body. This type of valve is commonly used in applications where bubble-tight shut-off and reliable sealing are essential.
Soft seal butterfly valves feature a disc or "butterfly" that rotates around a central shaft to control the flow of fluid in a pipeline.
The valve body is typically made of materials such as cast iron, ductile iron, stainless steel, or carbon steel, while the disc can be made of metal or another suitable material.
The resilient seat material, such as EPDM (ethylene propylene diene monomer), NBR (nitrile rubber), or PTFE (polytetrafluoroethylene), is securely bonded or encapsulated onto the valve body to provide a tight seal against the disc.
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.
This classification is based on how the valve is connected to the pipes.
This is the most economical and lightweight. This design aims to prevent bi-directional differential pressures and backflows. There are two pipe flanges that sandwich the valve. They seal and connect the valve to the pipe system through bolts. For stronger sealing, there are O-rings and gaskets placed on both sides of the valve.
The lug type butterfly valve has lugs placed outside and around the valve body. These are often used in dead-end services or in applications that only require low pressure. The lugs are threaded. Bolts, which match that of the pipes, connect the valve to the pipe.
The butt-welded butterfly valve has the connections welded directly to the pipe. This type of valve is primarily used for high-pressure applications.
This type is characterized by having a flange face on both sides. This is where the valves connect. This design is typical among large-sized valves.
| 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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