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A welded check valve is a valve used to prevent the reverse flow of fluid by providing a valve disc in the direction of fluid flow that can be opened and closed freely. When the fluid flows in the normal direction, the valve disc opens to allow the fluid to pass through; When the fluid flows in reverse, the valve disc closes to prevent the fluid from flowing back. Welded check valves are typically installed in piping systems to ensure unidirectional flow of fluid and prevent damage to pumps and other equipment due to reverse pressure.

The types of welded check valves include lift check valves, swing check valves and butterfly check valves. For example, lift check valves rely on gravity to operate and must be mounted horizontally with the valve cap nut on top. In addition, the removal and cleaning of the check valve is also very important, and special check valve removal tools can be used to remove and clean the check valve cavity.

In some cases, check valves need to have specific properties, such as a check valve with a fixed opening pressure that needs to be cycled six times before testing to ensure that it can seal within five seconds at the appropriate reclosing pressure. In addition, check valves need to be designed with the characteristics of the fluid and the application environment in mind to ensure their reliability and efficiency.