Every pool owner wants to keep their pool in top condition. A check valve is a small part that does a lot to protect your pump and equipment. But what does it do, and where should it go? Don’t worry, we have you covered.
This article explains what a pool check valve is, why it matters and how to install one, plus a few extra tips to help you understand how it works.
Pool Check Valve Guide
Here are answers to the most common questions about pool check valves.
What Is a Pool Check Valve?
A check valve lets water flow in only one direction. It is installed in the plumbing lines connected to your pool and stops water from flowing backward through the system. That helps the pump keep its prime when it shuts off and protects the pump, heater and other equipment from damage.
Why Do I Need a Pool Check Valve?
There are a few good reasons. If your pump sits above the water level, a check valve keeps water in the line so the pump does not lose its prime. If you have a chlorinator or salt cell, a check valve placed after the heater stops concentrated chemicals from flowing back into the heater when the pump turns off. Your local code may also require backflow protection on a pool fill line connected to city water, so check with your town.
What Happens When a Pool Check Valve Fails?
A worn or broken check valve lets water flow backward. The pump may lose its prime and run dry, and chemicals can flow back into the heater and corrode it. Over time that shortens the life of your pool equipment.
Where and How to Install a Pool Check Valve
The easiest way to get it done right is to have a pool professional install it. If you are comfortable with PVC plumbing and want to do it yourself, this guide will help. The most common spot is on the suction line just before the pump, which keeps water flowing one way and helps the pump hold its prime. The other common spot is between the heater and the chlorinator.
There are two main types. Spring-loaded (inline) check valves use a spring and disc that close when flow stops. Swing check valves use a hinged flap that opens with the flow and swings shut when the water stops. Many have a clear lid so you can see the flap moving.
Steps to Install a Check Valve
Here are the steps our pool repair technicians follow:
- Turn off the pump at the breaker.
- Close valves and drain the water from the plumbing line you are working on.
- Cut out the old valve, or cut a section of pipe where the new one will go.
- Dry-fit the new valve with the arrow pointing in the direction the water flows.
- Glue it in with PVC primer and cement, and let it cure for the time on the label.
- Restore power, run the pump and check for leaks.
Conclusion
A check valve protects your pump, heater and water quality, and it is an inexpensive part. Install it close to the pump for the best results, or between the heater and chlorinator to protect the heater. If you would rather have a professional do it, our pool equipment installation team can install or replace check valves for you. Do your research and choose the option that suits you, before a small problem becomes a costly repair.
Frequently Asked Questions
How do you choose the best pool check valve?
Match the valve to your pipe size, usually 1.5 or 2 inches. Choose a sturdy valve rated for pool use, and consider one with a clear lid so you can see whether it is working.
When should you replace a pool check valve?
Replace it if it is cracked or brittle, if it leaks, or if your pump keeps losing its prime because the valve no longer seals.
What are pool check valves made of?
Most are made of PVC. Others are made of polypropylene, brass, stainless steel or cast iron.
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