What type of end connections is used for valves smaller than 2 inches in diameter?

The use of threaded end connections for valves smaller than 2 inches in diameter is based on the practicality and efficiency of installation in smaller piping systems. Threaded connections offer a reliable and robust method for securing valves in place, simplifying the installation and removal process without the need for welding or additional fittings that might be necessary for larger connections.

This method allows for a tight seal, while also enabling maintenance and repairs to be conducted with minimal disruption to the overall system. It is customary and widely accepted in plumbing and various installation practices for smaller pipes, which often do not require the additional strength and support that flanged connections provide.

In contrast, other connection types, such as flanged options, are generally more suited for larger valves, while compressive connections are not typically employed for standard valve installations. The union patent connection is less common in these applications and is more often utilized in specialized or unique systems, making threaded connections the most effective choice for valves under 2 inches.