CE/ISO/DIN/BS Ductile Iron Qt450 Pn16 Manual Worm Gear PTFE NBR EPDM Lug Butterfly Valve

Product Description

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.

1. The valve body is small and light, easy to install, disassemble and repair, and can be installed at any position in the pipeline.

2. The whole valve has a simple structure and is very compact, with small operating torque, and can be opened and closed by rotating 90 degrees.

3. It has good flow regulation performance.

4. The seal can be replaced, the sealing performance is good, and the two-way sealing can be achieved.

5. The butterfly plate can be sprayed with a coating layer, such as nylon rubber or polytetrafluoroethylene, according to the needs of users.

6. Flange connection and wafer connection can be designed according to requirements.

7. According to the requirements of the working conditions, the soft-sealed butterfly valve can be driven manually, electrically or pneumatically.

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.

Butterfly Valves by Connection Type

This classification is based on how the valve is connected to the pipes.

Wafer Type

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.

Lug Type

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.

Butt-Welded

The butt-welded butterfly valve has the connections welded directly to the pipe. This type of valve is primarily used for high-pressure applications. 

Flanged

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.

 

 Material of Metal Seated Butterfly 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