Re: 25 gallon air compressor wont shut off,changed air...
You have a valve plate problem . It could be a slipped "o" ring to a bad reed valve. There are rebuild kits for that purpose. The kits include a valve plate assembly. It covers all the bases. When you look at this area pay attention to the partitions of the head gasket/"o"ring. You may avoid the cost of the kit.
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Pressure switch has gone bad and needs to be replaced. Part runs around $25. Go online and put in model number, pressure switch. You will find companies that sell replacement parts. I had to replace mind, it did the same thing.
if it is lifting both valves I would say that the pressure switch (regulator as you call it) is defective, if you try to shut it off using the manual switch and it keeps running, I would say that the switch is welded shut. if it does not shut off by 125 psi then it is faulty. The pressure switch is what controls the motor in response to pressure in the tank.
I assume it keeps pumping, but doesn't build any more pressure. That is probably bad valves or rings. If your unit has a crankcase breather, and it is puffing alot of air, look for rings. Otherwise valves.
Emglo airmate compressors are set from the factory to shut off at around 125psi. There is an adjustment (remove cover to pressure switch) that will controll the cut-off pressure but it is not recommended changing the factory setting. There is also a safety valve installed that will open at about 160psi. It is a small brass device with a pull ring. When things go wrong with the pressure switch (rectangular box with power cord coming out of one side) the safety will pop open. There is a pressure regulator with round knob on panel that will lower the pressure to the tool, however this regulator does not control the pressure switch. Let you compressor run untill it shuts off and verify pressure to be about 125, if it is then all as well. Good Luck
Most single stage compressors come with a pressure switch set to shut off at 125 - 145 psi. These switches become less efficient over time and will Begin to fail but remain useful. A safety valve (brass plut with pull ring) is installed somewhere on your compressor set to open at aprox. 160psi. If the pressure switch shuts off before the safety valve activates you could probably continue to use the unit. If however you would like to have the unit shut off at 125psi replace the switch any switch that can be installed in the space allowed. The black tubing that you see is the unloader. When the unit reaches set pressure and shuts off, the small valve under the pressure switch will open and release the pressure in the tubing. This allowes the compressor to start with no back-pressure. For max. life of compressor make sure that there are no leaks in system and upplug when not in use.
Pressure switches are sold in pressure ranges from 45psi to 160psi. Some brands are better constructed than others. A squareD switch will give long life being used w/o extension cord. Good Luck