What is a roughing port used for?
A roughing port on a gate valve provides an additional port to a vacuum chamber when all available ports are being used by other equipment. Since the path it provides is not straight, the typical application is to attach a flexible hose from a roughing pump to the port, hence the name. For more information, see Gate Valve Roughing Port, Option-04, -05 and -06 on Gate Valves Options section in the Technical Library.
