The selection of butterfly valves involves several important factors such as type, material, design, and features. A proper selection of the valve is crucial in order to ensure optimal performance and safety.
Type: The main types of butterfly valves include concentric, triple offset and double offset. Concentric butterfly valves are the most common type and provide a bidirectional flow of media, making them ideal for a range of applications. Triple and double offset valves are less common and are typically used in applications with more stringent requirements.
Material: The most common materials used to manufacture butterfly valves are cast iron, cast steel, stainless steel and bronze. The material used depends on the operating conditions and desired performance. For instance, stainless steel valves are used in applications where high temperature and corrosion resistance are important factors.
Design: The design of a butterfly valve determines its performance, which is largely affected by the type of disc used. Resilient seat discs are generally used in industries such as water, oil and gas that require bidirectional flow control. Metal seat discs, on the other hand, are used in applications where tight shut off is essential.
Features: Butterfly valves are available with a range of features such as automatic or manual operation, integrated positioners, high cycle life and safety valves. Depending on the application, certain features may be required for optimal performance. For example, some valves have an integrated positioner which allows for automated operation and precise control.
Installation: Butterfly valves are often installed in confined spaces requiring special considerations. The length and type of the valve must be appropriate for the space available. The piping system should also be taken into account as butterfly valves must be connected to a pipe system of the correct diameter and length.
In conclusion, the selection of butterfly valves involves various parameters that must be considered. These include the type, material, design, features and installation requirements. Proper selection is essential to ensure optimal performance and safety.
