A lugged butterfly valve is equipped with threaded, lugged inserts on both sides of its body. This design allows for easy installation and disconnection from the process pipelines without having to completely remove the valve, making it suitable for dead-end service and frequent maintenance applications.
A wafer butterfly valve operates by rotating a disc positioned in the center of the pipe. The disc is attached to a rod, which is operated either manually or by an actuator. As the disc turns, it either allows fluid flow by moving parallel to the flow or blocks flow by standing perpendicular to it.
The primary advantages of wafer butterfly valves include their compact design, ease of installation, affordability, and efficient flow control. They are also lightweight and require less structural support compared to other valve types.
Wafer butterfly valves are widely used in various industries including water and wastewater treatment, oil and gas, chemical processing, food and beverage manufacturing, and HVAC systems.
Wafer butterfly valves are suitable for a wide range of fluids, including water, air, gases, and certain chemicals. However, they may not be ideal for high-viscosity fluids or fluids containing large solids.
These valves are often made from materials like cast iron, stainless steel, and PVC, catering to different pressure ratings and fluid compatibility requirements.
Sizing a wafer butterfly valve involves considering the diameter of the pipe, flow rate requirements, the type of fluid being controlled, and the operating pressure. Professional consultation is advised for accurate sizing.
These valves are generally more cost-effective than other types due to their simple design, which requires fewer materials and less labor to manufacture.
Maintenance typically includes regular inspections for wear and tear, checking and lubricating the stem, and ensuring the sealing surfaces are clean and undamaged. The frequency of maintenance depends on usage conditions.
While wafer butterfly valves can handle a range of pressures, their suitability for high-pressure applications depends on their design and material. It's important to check the manufacturer's specifications for pressure ratings.