There are many types of check valves in use today. Some of the more popular types include: ball; dual plate or double-door; spring assisted in-line or nozzle or silent; piston or lift; and swing checks. As with other types of valves, specialty check valves can be found for special applications. While no one type of valve is good for all applications, each has its advantages. Take time to contact the manufacturer to assist in selection of the best check valve, especially if you are incurring problems with whatever type of check valve that is currently installed.

Selection

Among the many factors to consider when selecting a check valve are material compatibility with the medium; valve rating (ANSI); line size; application data (flow, design/operating conditions); installation (horizontal, vertical flow up or down); end connection; envelope dimensions, especially if replacing an existing valve to avoid pipe modifications; leakage requirements; and special requirements such as oxygen cleaning, NSF, NACE, CE Mark, etc.

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