Has Unloader Valve Issues

When it runs the air keeps running out of the unloader valve.  I wanted to make a "silent air" compressor out of my HF oil compressor. I took off the original (new) motor and replaced it with a motor/compressor from ...

my Cambell Hausfeld compressor just hums and does not start  Oil is not the problem, it is fairly clean - less than 50 hours on it. Electricity is good at 30 amps and good contact. I may be wrong on the unloader ...

I need a new valve   I cant find a new unloader valve any where . It is mounted on the switch box with 2 screws.

Please look at the pic

559-325-xxxx

Joe Guraro

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Curtis compressor Unloader valve  I have a old Curtis compressor and the rod that actuates the manual unloader valve has broken. Can I disconnect the unloader valve and try to use it,or ...

Compressor will only start with little to no pressure in the tank  Bill;

The compressor is a Norther Industial Tool 2 HP 8 Gallon.

The compressor will only start with no or very little pressure in the system and ...

Once pressure is reached compressor blows reset switch when maintaining.  If the compressor is at 0 pressure it will build up fine but then when using the compressor the motor kicks the reset switch when trying to maintain pressure....

curtis d97 unloader problem  I recently acquired a curtis d97 33a compressor. I cannot locate any information on it. It has an unloader problem. After reaching set pressure, motor ...

My compressor won't refill if there is any air in the tank.  I have a Hitachi EC12 portable air compressor, and it fills fine initially, but once some pressure is used and it tries to refill the motor tries, but ...

Craftsman 33 Gallon 1.6HP Compressor  Hi there, I bought this compressor from someone and it has very little use on it. Well since I have had it there has been one issue with it that I am trying ...

Air compressor will not build pressure  My 22 gallon campbell hausfeld air compressor will not build pressure beyond 20 pounds. When the pump is running there is a small valve on the side of ...

Leaking unloader valve when compressor is running  Hi!

I have a problem with a compressor pressure switch which has a leaking unloader valve. The valve lets out air immediately when the compressor is ...

Air compressor starts fine and fills to 120PSI, but won’t restart.  Air compressor starts fine and fills to 120PSI, but won’t restart. The motor seems to struggle to restart and then trips a 20amp breaker. I replaced the ...

Compressor Will Not Start until pressure drops.  Motor just hums and will not turn over until pressure in tank is reduced. It is a Sear craftsman

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Bill says...

Frank,...

Sears 1 HP, 12 gal. compressor with head pressure issues  Hi,

Thanks for your site - full of valuable information! I have an elderly Sears compressor that more than 50% of the time can not overcome the residual ...

hydrovane 15  Hi I have a hydrovane 15 compressor it runs OK, it stops to its set pressure (100 psi), but when it try s to start it has problems,I have notice that there ...

Air Compressor Stalls on startup  My air compressor Central Pneumatic 2hp 8 gallon is having problem when it try to starts automatically.

The motor runs fine when its first started, and ...

motor starts or runs slowly  hi,
i have a single phase motor, direct drive compressor that often, though not always, starts slowly or runs slowly for several seconds. eventually it ...

Motor freezes temporarily  I have a Kobalt 1 1/2hp 17 gallon, 155 psi compressor that will build up pressure to the shut off point and when it tries to restart as pressure is used ...

Motor lopes when trying to start.  Occasionally when I turn on my air compressor it will runh...runh....runh but not fully start. If I release the air from the tank valve it will start normally ...

New compressor unit installed tripping breaker on restart?  We just purchased a new Swan SW415 compressor with a 120 gallon tank, pressure switch with, mechanical unloader valve, and a 15 hp 230 volt (38amps) 3 ...

Unloader valve and check valve problem...solved!  Thanks very much for your information.

I have two old compressors that are having the same problem, they'll run fine, shut off properly, and then ...

Unloader valve leaks air when compressor running.  Porter Cable 5hp., 60 gallon.

The unloader valve hisses air while the compressor builds pressure, then when cutoff pressure hits, it unloads, and the ...

Unloader valve leak issue.  I have a two stage compressor with an unloader valve, after several years of work the unloader valve got full of gummy residue, I think from the little ...

Compressor Issue - Leak near pressure switch  My compressor pumps to cut off at 120 PSI then a little switch on the side of the regulator kicks in and drains air off till it reaches cut in pressure ...

wont restart after use  it wii fill up, but when I use it it will not start back up to keep air in tank,I had a problem with it before,it would filland then as i used it it would ...

tanks pressure tips reset on motor  I have a smaller, portable air compressor (can't remember what brand/model) that keeps tripping the reset on the motor IF there is pressure on the tank....

Compressor won't auto refill correctly  At the start of the day with pressure at 0 psi, the compressor will start up fine and fill the tank to 150 psi. As air is used and drawn down, the compressor ...

Unloader valve  I have a 919.167310 6hp 30gal craftsman compressor that wont restart at cut in time and pops breaker. I have replaced pressure switch with one i had found ...

unloading valve doesn't close after replacing motor  Hi Bill,

I bought a used 2hp air compressor with 24 liter tank and replaced it's motor with an air conditioner 1.25hp compressor.

Now I'm having ...

Loading unloding problem  dear sir
i had solenoid valve issue in my electric screw compressor 30 KW,
the unloading operation is not proper.

when i clean solenoid valve the ...

Unloader Valve may not be working  A friend of mine has a compressor he uses to run various tools and paint equipment. The compressor builds pressure Ok all the time most but every so often ...

tanabe - unloader valve  what happen to my air compressor if fail to unload

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Bill says...

The unloading process lessens the start up load on the ...

Compressor trips the breaker, but not when empty  Hi,my compressor tries to start but struggles for around 10 seconds then it blows the trip.
If the tank is empty it will start with no problem and run ...

It Won't turn back on once pressures bulds up  From a empty tank you can turn it on and it runs fine but after the auto shuts it off when you relieve the pressure and auto kick it back on the motor ...

unloader valve ~ blow off the unloader line  When to compressor reaches pressure the unloader valve will blow off the unloader line

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Bill says...

Are you saying that ...

Think unloader valve is faulty  Think unloader valve is faulty motor struggling not sure where valve is located

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Bill says...

Have a look beside the pressure ...

Compressor struggles to refill, then blows breaker  On start-up, the compressor will fill regularly, but when it needs to refill, it struggles and sounds like it is cutting out, until the internal breaker ...

Excessive Load on Compressor  My compressor will start fine when there is no pressure in the tank. When the motor is restarted when the compressor reaches the low limit for regeneration,...

will unloader valve unload pressure if power is lost  If power is shut off to the compressor from the circuit breaker instead of the switch on the compressor will the unloader valve still unload the pressure ...

my unloared valve plastic line seperated at valve.   factory seal at reguator valve seperated

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Bill says....

Howdy Michael. I'm not sure what your question is about your unloader valve ...

Compressor won't kick on when pressure drops.  My compressor will only start if there is zero pressure in the tank. I thought the problem was too much pressure on the head & sought to solve it by replacing ...

the relief valve on yhe head of my curtis e57 compressor blows when full pressure is reached  the factory tells me the relief valve is set at 70lbs . it has never been tampered with

air comes out of the exhaust of my air dryer  I rebuilt my air dryer because air keeps exiting the exhuast,

I have notice if I remove the line from the governor which is the unloader line, the ...

unloader valve  is this triggered by the compressor cutting off or is it pressure activated. Mine has a small spring and a needle through a plastic fitting.

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unloader valve shown in your example  where can I purchase the unloader valve you show in your example. I need that exact one and the so called dealer says they can not get it.

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Need information only on Quincy Air Compressor  On a Quincy Q325 or 310 (QR series) I want to know where the unloaded air vents.

I understand the diaphragm in the head unloader keeps the intakes valves ...

ec 12 pressure bilds fine, but then copressore shuts off and empties tank and resets.  It takes 20-30 fills to get the pressure not to release for the compresor to work properly. Pressure bilds fine and compressor shuts off while pressure ...

Not sure but i think the unload valve on my compressor is malfuctioning.  My compressor would build up air in tank and cut off and when it would try to restart it would stall and kick the reset on the motor. Ive replaced the ...

check valve for montgomery ward air comp. model # xer 6408  has been running fine for 30 years.runs but has a hard time when it's time to recycle...belt slipping ....no small escape of air when it reaches ...

I can't get my unloader valve to release pressure  It was working previously, and I was diligent about releasing pressure after every use. This unit is under a year old. It's a Mastercraft 8G

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the compressor will not cut back in   when the compressor is first turned on it will fill with air (because it doesn't hold air) but when using it after it is full it does not want to start ...

Draper motor wont start back up???  I have a Draper 150 litre 230v 2.2kw Stationary Belt-Driven Air Compressor.

When the tank is empty it starts no problem and builds up to approx 100psi ...

New Unloader Valve (for home modified compressor)  I have two old compressors that I found on trash day. One had a bad tank (horizontal Model #919178410 from Sears made by DeVilbiss), and the other had ...

Gardner-Denver 75HP Electra-Saver II Screw Compressor has "flutter" in unloader valve  My shop has a G-D 75hp Electra-Saver air-cooled screw compressor. It normally runs fine, but occassionally it develops a flutter that appears to be coming ...

Air compressor  Is a bleeder valve and an unloader valve the same thing on a pressure switch??

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Bill says...

Howdy Bob. Sure sounds like the ...

Coleman Powemte mode# BL0603310.01 made 3-22-2001  At first I thoughtthe comapcitor was bad because after the air would build up and kick off, it would attempt to kick on again to rebuild pressure the breaker ...

reconnecting a compressor ~ an extra air line???  I have a 60 gal 5 hp single phase compressor (energair) i bought at an auction. It has a 1/2" copper line off the compressor head to a tee in the tank....

Pressure releife on cylinders  after the initial build up of air shuts off and you have a call to start it will not start apears to be under pressure

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Bill says....

Quincy model 340 compressor -relief valve on discharge line from compressor relieves at early  Quincy model 340 compressor runs until 120 psi then relieves. system is suppose to run till 250 psi then shut off, but the relief valve on the discharge ...

compressor wont re start.  Hi I hope you can help, I have recently replaced the pressure switch and the compressor wont re-start when the pressure drops to 100psi.

It leaks air ...

Failing to start under pressure  Compressor will start and pump up OK, but once it needs to start again, it sounds like it is struggling and won't start. Letting the pressure down will ...

After initial and complete pump up, compressor seems to lug when drained  I have an Ingersoll Rand compressor and when I turn it on, it pumps up to about 150 PSI. When I start to use it and drain some air off, it seems to try ...

blows main breaker in house  my compressor motor will start up fine with no air in tank, however, when the tank is being used and the switch trips the motor to come on the motor wont ...

How do I set the throttle unloader for Campbell Hausfeld compressor  My unloader is not set correctly how do I adjust it so that it loads/unloads properly link to part here http://www.ereplacementparts.com/throttle-unloader-...

compressor restart issues  I have a Mastercraft 4 gallon air compressor. If the tank is totally empty, the unit will operate to the safety cutoff pressure. As the pressure declines ...

Do i need a unloader vavle on my swich  i have a presser switch with out unloader valve do i realy need a unloader valve

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Bill says...

Quite often, unloader valves ...

Air leaking out of unloader valve?

  Air leaking out of unloader valve? What causes this and what are the solutions? Here are answers....

Air Compressor Tank Fills and Loses Pressure and won't run  I have a campbell hausfled 20 gallon air compressor. When I start it, it runs great and fills up the tank with air. After using my air gun for a couple ...

My air compressor locked up on me?  it was working but when i pluged it back in it locked up and now all it does is hum can you please tell me whats wrong with it? thanks shane

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It builds pressure cuts off then when it needs to start again to keep pressure it humms and blowes the breaker  I have a devilbus 20 gal 5 hp oil less

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Bill says...

Hey John, nice to hear from MIlford. Was near there a few weeks ago ...

wont build up pressure under pressure  Goes up to 130 psi fine, when it is time to build pressure back up motor stalls then flips breaker on power supply. Tank has to be empty to build pressure....

Why does my compessor start pumping slow then speeds up  It just started doing this. Sounds like it pumps slow and then speeds back up to normal speed. It does not always do it but the last few times I have noticed ...

Sears air compressor  The compressor will start and build pressure up to the limit. After it cuts off I try to restart it and it runs slow briefly then trips the breaker. The ...

Ship air compressor - bleeding air from unloader  on start up my air compressor keep bleeding air from the unloader a longer time than usual what make this happen

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Bill says...

Go ...

Seems like unloader not working   Have a 2 stage 30 cfm compressor with 10th HP sf 220 ,kicks 50 amp breaker ,@125 psi worked fine for aprox 100 hrs. At @ 75 psi or under no load motor ...

How to reassemble pressure unloader switch?  Inherited a broken air compressor with a disassembled unloader switch and busted crankcase, but otherwise like new. JB Welded the case, it compresses to ...

This is the small valve that air comes out of when running  I couldn't figure out where to put photos on my add on so I started this one. My compressor will not build past 20 pounds of pressure. When the pump is ...

My air compressor is leaking from the unloader valve while the motor is pumping but dont leak when it isnt running  My air compressor is leaking from the unloader valve while the motor is pumping but don't leak when it isn't running

i have checked the check valve ...

Head pressure release won't stop  When the compressor kicks off and the head pressure releases the air just keeps coming out. I have replaced the whole side cover assembly and it still ...

Compressor wont start unless tank is empty??  I have a 80gal 220v Delta compressor and if there is any pressure in the tank it will try to start and struggle and then trip the breaker after about 6 ...

My protable air compressor will start but won't stay running  my protable air compressor will start if there is no air in the tank but when it is up to pressure and is slytly depleated and starts to recover it stops ...

Where is unloadvalve located at on the compressor or how does it look like  Compressor unloader valve

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Bill says...

Hello Luesengvang;

Have a look at this page please.

It's about pressure ...

Matco 25 gal has hard time refilling  It starts ok will build pressure to 120. When i start using the air it drops to about 80 and the compressor trys to restart. At this time the compressure ...

Unloader valve  i took it apart and found 2 pieces of spring, a little piece under the valve the other in the cap. is there a picture of unloader valves in tack thanks ...

Craftsman 12 gal, 2.5 HP Horiz. Air Comp.  System builds up to 80 PSI and I shut it off manually. On trying restart the motor bogs down as if it is bucking the load within the tank. Im guessing ...

HUSKY COMPRESSOR NEEDS RESETING EVERY TIME  I HAVE A HUSKEY 5.5 HP 26 GALLON DIRECT DRIVE NO BELT THAT WILL RUN AND BUILD UP TO 120 PSI AND SHUT OFF. THATS GOOD BUT WILL NOT START BACK UP EVEN ...

Compressor Not Unloading  I have a Husky (Campbell Hausfeld) 80 gallon 2 stage compressor and it does not unload when it reaches capacity and when I drain air down it kicks reset ...

Oil type rotary screw unloader valve   this unit is a homan howden 2855 1265 and is only building about 40psi with discharge valve open. with it closed it will pump up to about 120 psi. at ...

Motor stalls when re-loading  Hi,

Our compressor fills to cut-off pressure, motor goes to idle then when ready for re-load motor immediately stalls.
Any idea's. Thanks!



Bill ...

John Rybiski  I have a model 3Z355 Speedaire compressor. Here is my problem. The compressor builds the set pressure and shuts off, but when the pressure drops to the ...

prv valve blows after its full  I have a speedaire 5f237a.

It works fine at first but after about a 1/2 hour of use the prv valve blows. not sure what the problem is.

should ...

Cannot start up my compressor when there is air in the tank.  Hi There,
I have a cheap 45 litre tank compressor.
When i use the compresser at the start of the day , it will not pump and buzzes for a few seconds ...

Compressor Struggles to Restart After First Shutoff   I have a 220v (Craftsman Professional/Devilbiss) compressor and am having problems with the motor (AO Smith) starting that has 2 start capacitors on it....

Compressor fails to cick in.  I bought a new non return valve but it might be falty, the compressor runs full with no problem and cuts out as normal, but when its time to cick in the ...

The unloader valve.  May I purchase just the unloader valve and not the whole pressure switch (which W.W. Graingers is telling me I have to)? To me replacing the whole switch ...

Air compressor sometimes kicks out overload  old sears air compressor 120 volt 4 gallon 3 hp starts ok and pumps up to 150 psi and when air goes down to 120 psi air compressor tries to start but kicks ...

Air compressor pump  we have a few sm 1-2 hp port compressors that go out to jobsites

we got one back giving us fits

kicks on comes up to pressure air is comsumed ...

Circuit breaker on motor pops within 5 or 6 sec after starting up.  I just purchased a 65903 compressor from Harbor Freight Tools and as my shop was wired by a licenced electrician and was inspected by a British Columbia ...

Unloaders for a twin V compressor  I am having no luck figuring this out. Hope you can help.

I bought a new v-twin compressor with head unloaders.

I know what unloaders do but I am ...

High Compressor blows fuse during startup  Hi we a high Compressor purchased from China made by Changsheng Air Compressor, 380 Volts & 3phase. We use this compressor to blow PET bottles. During ...

Unloader Valve  I have a reciprocating air compressor with an "unloader" valve with a set point of 125 psi.

It doesn't have an electrical pressure switch so it will ...

What do the unloader valve do?  I have a carrier unit and the unloader valve is bad now the insurance company won't pay for the damange load beacause of the valve



Bill says....

air compressor problem  Hi, My clarke air compressor tends to slow down almost to a halt as it tries to recharge.
I noticed that the motor although almost stops as well it still ...

New Compressor trips breaker on restart fixed  The Swan tech came out today, and lengthened the discharge line a fare amount by going around the whole compressor unit, giving ample time for the motor ...

Sears compressor unloader valve  I have a sears upright compressor from about the mid 1980's i need an unloader valve. Where can i get one? The part is no longer available from sears....

A question about how compressor unloader valves operated.  How do unloaders work in a compressor?



Bill answers...

You can answer this question yourself, Richard.

Simply go to the site map page,...

Unloader valve for gas compressor.  How do I know what kind of unloader valve I need? And do I need a throttle control for the gasoline engine?



Bill answers...

Hello, and thanks ...

Unloader for a two stage gasoline powered compressor  Is the unloader valve the same on gasoline powered and electric powered compressors? If not, what does a gas powered use instead of a unloader valve. I ...

Continuous run unloader - how to adjust?  I am building a compressor from components and I have a new continuous run unloader from princess auto.

It is preset to cut in at 115psi and cut out ...

My unloader is not dumping air.  I have a webster compressor head and a typical pressure switch with a unloader built in.

I've taken the unloader mechanism on the head apart, and it ...

Adjusting the unloader valve on a recip comp. 75hp  How do you adjust the unloader valve on an old 75HP IR ES-1 compressor? I cannot seem to make it work.



Bill answers...

Hi Rick;

Short ...

Unloader valve leaking  I have a Speedaire Model 12935A 2 stage compressor.
When it reaches pressure and shuts down the unload valve blows back until compressor starts again....

Unloader Valve question...pressure switch has reached set pressure  I have built compressors for several years but i am having a problem in the electric motor restarting after the pressure switch has reached set pressure ...

An unloader issue.  I HAVE BUILT SEVERAL ELECTRIC MOTOR DRIVEN COMPRESSORS OVER THE YEARS. AT THIS TIME I BOUGHT 3 MOTORS RATED AT 3 HP. ONE OR TWO HAVE 220 VOLT SUPPLY AND ...

Compressor bogging down and blowing the circuit breaker  Compressor starts up and runs good on an empty tank.

When I go to use air it replenishes itself and when the motor starts up it bogs down and break ...