Quiet Check Valve for Sump Pump 

at Pumps Selection

Why is there such a loud sound when my sump pump shuts off? It is a loud clunking thudding sound. The sump pit is below our dining room and we have a bedroom in our finished basement. How can we get rid of the irritating noise? I thought the noise was the pump. I called the manufacturer and he said the sump pump is not making the noise; it is the check valve that is making the loud clunking thudding sound.

Is there such a thing as a quiet check valve for sump pump? Yes. Read about them now.

The following information is provided to help you understand
how the loud noise happens, how the design makes a difference in the noise level, where you can find the quiet check valves, and what other customers say about the quiet check valves for sump pumps.
Campbell B-0823-15 and Pasco Silencer Sump Pump Check Valves.

Select a specific topic for quiet check valve for sump pumps if you wish to read about the topic immediately. Otherwise scroll down the page to see all topics.

Why does a check valve make a loud noise?

The force of water flowing backward through the discharge pipe when the sump pump shuts off causes a loud clunking thudding noise as the water hits the check valve.

Eliminating the check valve is not the solution. A check valve is placed in line with the PVC discharge piping connected to the sump pump discharge port to prevent water remaining in the discharge pipe to flow back down the pipe through the pump and back into the pit when the pump motor turns off.  The check valve prevents the sump pump from pumping the same water over and over and prevents unnecessary wear and tear on the pump.

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Check valve installed with sump pump system

How does the design make a difference in the noise level?

The sump pump motor and impeller give velocity to the water as it moves upward. The check valve gate opens upward as the water comes through. The profile of the gate makes a difference in how the liquid flows through. The more specifically the gate is designed to give passage to the water and air without causing a change in its velocity, the smaller the amount of pressure loss. The lower the pressure loss, the quicker the gate moves back into closed position preventing air and water from going through the sides of the gate and causing water hammer. The more precise the fitting of the gate to the wall of the inner chamber the better the seal and the lower the chances of water hammer.

By applying the explanation provided above, it becomes obvious there is a distinct difference between the hydrodynamic design of the Pasco or Campbell check valve and the common hardware stocked check valves. In addition, when putting ones finger inside the inner chamber and feeling the movement of the gate, it becomes obvious that the spring gate of the Campbell check valve will close rapidly.

Sump pump check valve design comparison

How does the noise of sump pump check valve brands compare?

The Campbell check valve is most quiet. It has a highly defined hydrodynamic design and a ½ pound stainless steel spring for the spring gate.

The Pasco is a close second to the Campbell check valve. It has a highly defined hydrodynamic design; however the flap gate is hinged and does not have the strong steel spring. Customer reviews indicate the Pasco check valve is as quiet as the Campbell.

The Basement Watchdog comes in third. It has an additional air chamber to absorb the noise.

Zoeller, Little Giant, Flotec and Wayne rank fourth. Some of them are designed with an inner chamber with some hydrodynamic design and a looser fitting flap. They work fine if you don't mind a noise every time the sump pump shuts off and a small amount of water running through the check valve and back through the pump and into the sump pit.

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Sump Pump Check Valve Noise Comparison

Are quiet sump pump check valves more expensive?

Quiet sump pump check valves are not more expensive than other sump pump check valves.

The Campbell and Pasco check valves were very comparable in price at the time of this comparison. Campbell was $16.56 and Pasco $17.55. The Basement Watchdog Klunkless was most expensive at $24.99.  Wayne was cheapest at $9.61. Zoeller and Little Giant check valves were the same price $11.25. Flotec was $13.25.

Based on price comparison, the Campbell and Pasco  check valves are the best choice - their price is competitive and they are rated by consumers as the quietest check valves.

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Do consumers say quiet check valves are really quiet?
Read consumer reviews to see what they say

The Pasco 29121 is quiet    September 21, 2011
By James White, New Hampshire
My plumber put in a new sump pump. The new sump worked fine, but I began to notice after it finished its cycle there were two loud "clunks". I began to investigate and found the noise was due to the check valve closing and the pressure in there was making a "water hammer" clunk. I mentioned this to the plumber. He told me he put in a good quality check valve, but I could tell he did not seem to know as much on this topic. So I did more research and found the Pasco 29121 online, purchased it and asked him to install it for me. He seemed a little skeptical, but said he'd try it. There is barely a sound when the check valve shuts off now. I am so glad I found this. 

Silence at last!  August 1, 2011
By Cindy Johnson, New Jersey
Total silence. This has changed my life. To think I listened to the clunking thudding sound for over 20 years. Its so quiet I have to remember to check the sump pump system to make sure it is working. I don%u2019t hear a sound. I really think it is cool to see the gate work through the clear plastic. I love my Campbell check valve.

This works,  July 31, 2011
By Jim Yates, Chicago, IL
I have a one horsepower pump. I was having trouble with all other manufacturer check valves either blowing apart (rubber type) or failing prematurely. I was wondering if I would ever find a good check valve. I found the Campbell. It works with my one horse power pump. I can see the internals to see if everything is working properly. There is no noise either. If you want a reliable quiet check valve look no further. I have bought 3 of these, one for each pump in my house, and will never turn back to any other type.

Why did I not know about this sooner, July 15, 2011
By Judy, Illinois
The Pasco check valve has changed my life. Everything is so quiet in the house now. We live in a high water table so our pump runs every 15 minutes during dry days. I got so used to hearing the clunk of the check valve I have to remind myself to check if the sump pump is actually working now. I can't hear it upstairs any more. This is a great invention.

No more water hammer sounds,   April 22, 2011
For years I listened to the water hammer sound when our sump pump went off. I installed a Pasco check valve 23 inches above the pump, and it solved my problem completely. No sound at all now! I have a 1 1/4 PVC so bought adapters to transitiion to the size of my 1 1/4 PVC since the Pasco check valve ends are 1 1/2 inches. It was not that expensive either.

A quiet check valve at last,   March 5, 2011
By Dale Johnson, Indiana
Our sump pump made such a noise when it shut off. I thought it was the pump. In talking to a plumber I learned it was the check valve. I asked him what he would recommend. He suggested the Campbell quiet valve. I found one at Amazon for a great price. I installed it myself. Not really hard to do. Now it is so quiet when the pump runs. This is a great product.

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To read more customer reviews
  • Click on the description below
  • Click on 'average customer review' for the Campbell B-0823-15 Check Valve and the Pasco 29121 Check Valve.

Campbell B-0823-15  1-1/2" True Union Silencer Sump Pump Check Valve Clear view PVC design
Pasco 29121 1-1/2" Silencer Sump Pump Check Valve

Purchase links for quiet sump pump check valves

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Campbell B-0823-15C QuietSump Check Valve Fits  1 1/2 in Pipe

Spring Loaded Gate


Campbell #B-0823-15C QuietPump Check Valve 1 1/2 in True Union Design Clear PVC boday to see pump performanceCampbell QuietPump Check Valve 1 ? in See-through PVC body to watch pump perform
Pasco 29121 Silencer Sump Pump Check Valve Fits 1 1/2 in. discharge

Campbell Manufacturing B-0823-15 "Brady" Quiet Check Valve 1.5" - White

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Check out other sump pump check valves and submersible sump pumps.