How Do Electric Hot Water Heater Check Valves Work?

••• Vladdeep/iStock/GettyImages

What is a Check Valve?

A check valve is a device that is installed in the pipes connected to a water heater to prevent the backflow of water. When the water flows forward toward the check valve, the valve opens to allow the water to flow through. When the flow of water stops, the check valve closes so that the water cannot reverse direction and flow back the way it came.

Advantages of Check Valves

Check valves are important in a water heater because they prevent flooding or overflowing. They also stop the water from constantly flowing backwards, even when the heater is off. This prevents eroding of the pipes and saves power.

Operation of a Check Valve

There are several types of check valves, but most water heaters use a swing check valve. A swing check valve contains a disc attached to the wall of the pipe by a hinge. When the water flows forward through the valve, the disc swings open on its hinges, allowing the water through. When the flow of water stops, the disc slams shut, preventing any backflow. In some cases, the swing check valve is weighted so that it will operate most effectively.

Related Articles

How Does a Check Valve Work?
Ways That Communities or the Government Can Conserve...
How to Calculate GPM from PSI for Water
How to Fix a Submersible Water Pump
How to Make Negatively Charged Water
How to Calculate Static Head
How Does an Old Well Pump Work?
How to Light a Lightbulb With Saltwater
How Does a Pitcher Pump Work?
Density Vs. Viscosity
How to Make a Simple Circuit
How to Reset a TI89
How Hydraulic Pilot Valves Work
How to Calculate the Minimum Flow Rate of the Cooling...
Difference Between Hydraulic Fluid & Oil
How to Treat High Conductivity in Water
The Uses of Electric Energy
How to Shrink Rubber Bands
How to Calculate Ohms
How to Build a Water Clock