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Welcome back to another exciting edition of Inspector Pumphead’s Video Classroom! In this feature, I, Inspector Pumphead, will tackle a common question about pumps, parts or water systems using fun visual aids. This video is designed for those who like visual learning or enjoy a bit of fun in the classroom!

In today’s feature, Pump Products sales specialist Nick is talking about check valves! He will explain what check valves are, why your pump needs a check valve and a little bit about the variety of check valves that you can use for a given pumping application.

What is a Check Valve?

A check valve is simply a valve that is installed on a discharge pipe leading away from pump and that acts as a backflow preventer to stop any discharged water from travelling back the way it came. This is important because water that flows back into the pit or basin containing the pump will activate the pump, causing it to cycle more frequently than is necessary for the system. Eventually, this will cause the pump to burn out and break down.

How It Works

The two main types that Nick talks about are a spring controlled check valve and the more common “flapper” check valves. Spring controlled valves use water pressure to move a spring, which opens the valve before closing. They are well-suited for use in pressure boosting applications and often use a threaded connection.

Most check valves you encounter will be flapper-style valves, often in standard sump or sewage applications. Such check valves will have a thin, lightweight plastic door that opens in a flapping motion away from the pump (in the direction of the flowing water). Once the water stops flowing, the door shuts and prevents backflow. Different types of connections can be used. For instance, the Liberty CV150 uses flexible Fernco rubber connections, while others use PVC solvent.

The Zoeller 30-0040 is a “quiet check” valve that reduces noise and the risk of water hammer. The Liberty BCV150 is a combination ball and check valve with a union connection. The check valve prevents backflow, while the ball valve functions as an isolation valve. The structure allows for easy disassembly without disturbing the piping.

The check valves used in the video are ultimately a sample of the many varieties you can find and use for your pumping application. If you do not see the check valve you want or need listed here, be sure to contact us and we can get it for your system.

Pump Products sales specialists are standing by to help you find the right pump or part, as well as to provide price quotes, stocking availability and shipping information. Call our toll free number 1-800-429-0800 to speak to an expert today.