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A wafer butterfly valve is a type of butterfly valve that is designed to be installed between two pipe flanges. It has a flat disc that rotates on a hinge to open and close the valve, and the disc is held in place by a pair of rubber seals that sit on either side of the disc. The disc is able to move freely within the body of the valve, which allows it to open and close the flow of fluid through the pipe.
A lug butterfly valve is similar to a wafer butterfly valve, but it is designed to be installed between two pipe flanges using lugs that are attached to the body of the valve. These lugs are used to bolt the valve to the pipe flanges, and they provide additional support to the valve body. Like a wafer butterfly valve, a lug butterfly valve also has a flat disc that rotates on a hinge to open and close the valve. However, the disc is held in place by lug-shaped seals that are attached to the body of the valve.
Both wafer and lug butterfly valves are used in a variety of applications, including water treatment, chemical processing, and oil and gas production. They are known for their simplicity, reliability, and cost-effectiveness, and they are often used as an alternative to other types of valves such as gate valves or globe valves.
Lug butterfly valves are usually made of metal such as ductile iron or steel. They are characterized by threaded threaded lugs located on the valve flange for bolting.
Lug butterfly valves are suitable for terminal services, but blind flanges are always recommended. The manufacture of the lug butterfly valve is compatible with pneumatic or electric drive. The disc and seat material should be determined according to the application and flowing medium.
Most wafer butterfly valves are designed with four holes, aligned with the connecting pipe. The valve is designed to be clamped between two flanges in a pipeline. Most wafer butterfly valves meet most flange standards. The rubber or EPDM valve seat forms a very strong seal between the valve and the flange connection.
Unlike the lug butterfly valve, the wafer butterfly valve cannot be used for pipe end or pipeline end service. If maintenance is required on either side of the valve, the entire line must be shut down. The wafer butterfly valve is manufactured to be compatible with pneumatic or electric drive. The disc and seat material should be determined according to the application and flowing medium.
A lug butterfly valve is similar to a wafer butterfly valve, but it is designed to be installed between two pipe flanges using lugs that are attached to the body of the valve. These lugs are used to bolt the valve to the pipe flanges, and they provide additional support to the valve body. Like a wafer butterfly valve, a lug butterfly valve also has a flat disc that rotates on a hinge to open and close the valve. However, the disc is held in place by lug-shaped seals that are attached to the body of the valve.
Both wafer and lug butterfly valves are used in a variety of applications, including water treatment, chemical processing, and oil and gas production. They are known for their simplicity, reliability, and cost-effectiveness, and they are often used as an alternative to other types of valves such as gate valves or globe valves.
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