What are the two general classifications of diaphragm valves?

Diaphragm valves are classified primarily based on their design and operational mechanisms, with the two main types being weir type and straight through or straight way type.

The weir type diaphragm valve has a seat that is elevated above the valve body, creating a constriction for the flow. This design effectively handles applications where flow control is critical, providing better throttling capabilities and minimal turbulence. The weir shape allows the diaphragm to seal more effectively for the flow path, which is particularly suitable for liquids with varying flow characteristics.

On the other hand, the straight way type diaphragm valve has a path that flows directly through the valve without any restrictions. This design minimizes pressure drop and resistance, making it advantageous for applications requiring a straightforward flow path. It is commonly used in situations where the medium requires minimal obstruction during flow.

Understanding these classifications helps in selecting the appropriate diaphragm valve based on the needs of the piping system, the type of materials being handled, and the required functionality for the process involved.