The safety valve pops open to relieve excessive air pressure if the pressure switch fails to shut off the air compressor at the cut out pressure setting.
Air compressor leaking air from unloader valve.
This is evidenced by the continuous hissing sound that you will hear.
The valve on the outside of the pressure switch may look something like the one in the image.
Because the unloader valve is installed in an air line all of the air could escape.
Hotdog compressor was working very well till last month when the unloader valve opened while the compressor had kicked in to build up the.
This will effectively emulate the operation of the unloader valve as any air trapped over the piston will flow into the tank as the tank pressure drops.
I am trying to figure out what compressor i have and which parts to check for needed cleaning or if there are replacement parts for.
Unloader valve is leaking air.
I had a look at the check valve and all is good.
A failed air compressor unloader valve is one of the most common reasons why your air compressor cannot restart after you have used air from the compressor tank.
Plug the compressor back in.
My air compressor just started to leak air continuously when the unloader fires off as the motor is cut off.
My little 2 gal.
Air compressor unloader valve leaking.
I have included pictures of the air compressor.
If air leaks out the unloader when the pump stops replace the check valve because the check valve leaks air back towards the unloader.
The continuously leaks from the valve on the bottom of this.
Sometimes the air evacuating from the unloader valve would not stop.
Replace the safety valve if it leaks air constantly.
When the air compressor reaches the normal cut out pressure and stops but you notice while the air compressor is off that air is leaking out of a valve attached to or perhaps inside of the air compressor pressure switch.
When the the air compressor unloader valve is working correctly the pressure in the tank has dropped to below the normal cut in pressure level of the pressure switch the pressure.
The unloader valve is leaking air when the compressor is running.
When this happens this means that the valve probably has a leak.
Air continuously leaks out of the unloader valve on your air compressor and this is a problem.
