Double Eccentric Butterfly Valve
Speciality Valve is esteemed as the prestigious Double Offset Butterfly Valve Manufacturers in India. Our commitment to superior service means that we support you throughout the entire process, from initial consultation to after-sales service.
About Double Offset Butterfly Valve:
A double offset butterfly valve, also known as a double eccentric butterfly valve, is designed to provide superior sealing performance and longer service life compared to traditional butterfly valves. The “double offset” refers to the two distinct offsets in the design of the valve, which minimize friction and wear during operation. This type of valve is widely used in industries such as water treatment, oil and gas, chemical processing, and power generation, where reliable and efficient flow control is critical. The structure of a double offset butterfly valve incorporates two key design offsets that differentiate it from standard butterfly valves. The first offset involves the shaft being positioned slightly behind the centerline of the sealing surface. This offset ensures that the disc does not interfere with the seal until it is almost fully closed, reducing wear and tear on the sealing surfaces. The second offset moves the shaft from the centerline of the pipe and valve, creating a cam-like action when the disc rotates. The disc, usually crafted from the same or compatible materials, is connected to the shaft, allowing it to pivot within the valve body. Seals or seats, often made from elastomers or metal, are positioned within the valve body to ensure a tight closure when the disc is in the closed position.
Working Principle:
The two eccentric offsets that enable smooth and effective disc motion are the center of a double offset butterfly valve’s functionality. The disc inside the valve body pivots as a result of the shaft rotating in response to actuator or handle movement. When the disc is fully open, it is positioned parallel to the fluid’s flow, providing for maximum flow with the least amount of resistance. The double offset design minimizes contact and wear by ensuring that the disc slides away from the seat in a cam-like action as the valve closes. A small spin is used to produce the final closure, in which the disc presses up against the seat to form a tight seal. Even at high pressure, this tight seal guarantees little to no leakage.
The valve’s ability to provide a tight seal and ease of operation makes it ideal for critical applications requiring precise flow control and minimal maintenance.
Advantages:
1.Enhanced Sealing Performance
2.Reduced Wear and Tear
3.Lower Operating Torque
4.Long Service Life
5.Suitable for High Pressure and Temperature
6.Improved Reliability
Industries:
1.Water Treatment
2.Oil and Gas
3.Chemical Processing
4.Power Generation
5.Marine and Shipbuilding
6.HVAC Systems
Description:
1.Available materials: Cast iron, Ductile iron, SS304, SS316, Carbon steel (WCB, WCC, WC9, WC6), SS316L, Duplex steel(F51,F53,5A,4A,6A)
2.Size: 2” to 72”
3.Class: 150 to 300
4.Nominal Pressure: PN6 to PN25
5.Ends: Wafer, Lug, Flanged
6.Operations: Gear Operated, Electric and Pneumatic Actuated, Lever