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Check Valves | Regulator kits
Safety Valves
Hard-to-Find Repair Parts No Longer Available Anywhere Else
Why These Parts Are Hard to FindMany older machines are still perfectly usable, but the manufacturers have stopped producing the small components that keep them running.
OnlyRepairParts focuses on locating and reproducing discontinued OEM parts for equipment that is still worth repairing.Common examples include:
-air compressor check valves
-obsolete pressure switches
-discontinued mower springs
-replacement components for older power toolsIf a small part fails, an otherwise good machine often gets thrown away. Our goal is to keep that equipment working.
OEM replacements and discontinued parts sourced for equipment still worth keeping alive.
Sourced by a former repair parts specialist with decades of experience locating discontinued OEM replacements.
More discontinued parts being added.
Air Compressor Leaks Air After Shutting Off
If your air compressor leaks air after it shuts off, the problem is often the tank check valve. The check valve lets air into the tank, then stops tank pressure from flowing back toward the pump and pressure switch.One sign of a bad check valve is air hissing from the small tube or fitting on the side of the pressure switch after the compressor shuts off.A small hiss for a few seconds can be normal if it’s coming from the pressure switch unloader. But if air keeps leaking after shutdown, the check valve may not be sealing.Where is my check valve?
Think of your check valve like an iceberg. Most of it is hidden. The important part is actually inside your air tank.Air flows from the pump head through a supply tube, then into the top of the check valve. The top may look like a simple brass nut or fitting, but it is not just a nut. It is the visible top of the check valve as seen in the image on the right below.Most of the check valve threads into the tank, where moisture and rust can damage it over time as seen in the image on the left below.
A few of our available replacement Check Valves
How to install a check valve
Turn off and unplug your air compressor. (In other words, kill the power!)
Drain ALL of the air pressure from your air compressor tank. (unless you want a missile being launched into the ceiling)
Follow the air supply tube from your pump head and find where it enters your tank. There should be a brass compression nut around the tube which connects to threads protruding from your air tank.
Loosen and remove this supply tube from the check valve.
Using an appropriately sized socket, remove the check valve from the tank.
Now you have removed your rusty and defective check valve causing you all of your problems.
Install thread sealant on the new check valve (if sealant is not supplied on the check valve) and carefully thread it into the tank.
Tighten the check valve snug, but do not overtighten.
Reverse the steps above to complete.
Regulator Leaking
*Is air hissing from under the cap of your air pressure regulator?*Are you unable to adjust the air pressure going to your hose?These are common signs that the internal parts of your air pressure regulator are worn. Air may be leaking around the diaphragm or o-ring seal.Some older regulators can be repaired with a rebuild kit instead of replacing the entire regulator.Click the links below to see the regulator repair kits we currently have available.
Questions About Fitment?Email a clear photo of your old part and the model number from your compressor.[email protected]
Safety Valves
What is a tank air compressor safety valve and why do I need it?
NEVER REPLACE A LEAKY SAFETY VALVE WITH A PLUG, EVEN TEMPORARILY!!
A safety valve is something that the manufacturer installs in an air compressor to prevent the tank from rupturing in the event that the control systems on the air compressor allow the air pressure to exceed the manufacturers maximum cut-out pressure.
A tank safety valve is typically set at ~20lbs over the cut-out pressure of "most" air compressors.
The safety valve has a psi rating on the side of it. This will tell you the air pressure where the safety valve has been designed to release the air pressure inside of your air tank.What can cause a tank safety valve to discharge excess air?
1) If your pressure switch is defective, allowing the cut-out air pressure to be exceeded, then the safety valve does it's job by releasing this excess air.
2) The safety valve over time can become defective allowing air to release BEFORE the cut-out pressure is reached.
Where is the safety valve located?
The safety valve is typically located in one of several places.
-A multi-port manifold where the pressure switch is located.
-Directly on the air tank itself, typically near the top of the air tank.Typically it will have a test pull ring on the end so that you can test the operation of the safety valve.Proper test1) Bring the tank to normal cut-out pressure
2) Shut the compressor off
3) Put on eye protection
4) Stand clear of the discharge
5) Pull the ring briefly.
You should get a strong blast of air. Release it, and the valve should snap closed without continuing to hiss.Replace the valve when:-The ring will not move
-Little or no air comes out
-It sticks open
-It continues leaking after being exercised
-The body or spring is badly corrodedDo not oil it, adjust it, plug it, or replace it with a higher-pressure valve just to stop leakage. The ring is a test handle, not a pressure-release control you should routinely use to empty the tank. The bottom drain is still needed to remove condensed water.
