unloader valve shown in your example

by Chuck
(Machesney Park, Illinois)

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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Bill says...

Chuck, I would love to help. My compressor unloader valve came with the air compressor that I bought at a big box store some years ago.

That same store does not sell parts, the air compressor or most components are of Chinese origin, and parts are not readily available.

Scan the on-line sale sites for used compressors like I recently did. Picked one up for $10, and the parts from it are interchangeable with some of the parts on my compressor. Now I have spares.

Cheers,

Bill

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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 pressure switch and the relieve valve, the unload valve is on the pressure switch so its new too. It will run fill tank cut off like should one time. And kick resest when it trys on the second time. Is there a adjustment on the unload valve, when it cuts out the second I dont hear and exhaust air.

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Bill says...

Based on what you have written, you either still have an unloader valve problem, or you might have a pressure switch problem.

Here's a test.

Run the compressor to cut out pressure. Unplug it. Open and drain tank. Close tank drain, and plug it in. If it starts OK, odds are that it's the unloader valve not venting properly.

If the pin on the side of the pressure switch is not pushing in when the compressor stops, then the unloader valve needs adjustment to make that happen.

Cheers,

Bill

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I can't get my unloader valve to release pressure

by J Dutton
(Canada)

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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Bill says...

G'day. I'm a bit confused (my normal state as I get ever older) about your question.

It may only be terminology.

Please have a look at the unloader valve page linked from the site map, and also, have a look at the tank drain valve info.

I can't tell from your question if it's either or both. Please post your response as a comment to this thread, and I'll be glad to try and help.

Cheers,

Bill

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unloader valve

by Whit Richardson
(Hattiesburg, Ms. USA)

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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Bill says....

Hi Whit.

Your compressor unloader valve is commonly attached to the side of your compressor pressure switch.

When the switch trips based on a low pressure or at the higher cut out pressure level, a toggle on the side of the pressure switch, which is attached to the switch innards, moves up or down.

This toggle pushes on the pin opening the unloader valve when the pressure switch cuts the power to the compressor motor, and the toggle moves away from the unloader valve pin, allowing the unloader valve to close, when the switch trips to start the compressor and while the compressor is running.

Cheers,

Bill

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Need information only on Quincy Air Compressor

by Ed
(Laramie)

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 (2 stage models)from seating.

In the LP cylinder does that mean air is taken in and out of the air filter?

What about the HP? In and out of the after cooler?

The factory confirmed holding the intakes "open" but also mentioned a bleeder valve. Is this bleeding buildup out through the unloading cylinders?

Corn-fused, thanks for any insight.

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ec 12 pressure bilds fine, but then copressore shuts off and empties tank and resets.

by andy
(foxboro)

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 is then reduced back down to 20 lbs. It now takes 20-30 cycles for this to work properly
thanks,
Acb

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Bill says...

Hi there. I don't think you have an unloader problem, I think you do have a check valve problem.

Navigate to the check valve page from the site map page and have a read.

Cheers,

Bill

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Once pressure is reached compressor blows reset switch when maintaining.

by Charles Vore
(Altamont, KS USA)

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. The only way it will work again is if I bleed all the pressure off the tank.

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Bill says...

Charles, the compressor runs fine from an empty tank to normal cut out pressure. You use some air, the pressure in the tank drops, the pressure reaches the normal cut in pressure, and then when it tries to start, the breaker pops?

This being a correct understanding of your compressor problem, look to the air compressor UNLOADER VALVE. Info on the unloader valve is linked from the site map or from the valves page.

Cheers,

Bill

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Draper motor wont start back up???

by Dale
(Doncaster)


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 then on the bottom of the main switch the air pipe blows air out very fast till it runs below pressure for it to kick back in then the motor turns it very slowly and doesnt build back up.

But if i empty the tank it turns on and builds up no problem again.... Im very confused

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Bill says...

Sounds to me like you may have problems with the pressure switch not shutting off the unloader valve, or the check valve, or the unloader valve itself.

Have a read of pressure switch, unloader valve and check valve pages, all linked from the site map page, for details on how these work.

Add a comment to this thread if you need more info.

Cheers,

Bill


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check valve for montgomery ward air comp. model # xer 6408

by herb
(Temecula Ca.)

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 max psi....100...took apart check valve seems fine.when not connected to tank runs fine ,but when I hold finger against cylinder outlet ,starts to run sluggish.....

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Bill says....

Herb, check out the Unloader Valve page (linked from site map page) and make sure this is working on your compressor.

Might also read the Check Valve page to get a better feel for how these work in conjunction with the Unloader Valve.

If this helps, great. If not, please comment here so I can refer back to this original email too, when I try to help you again.

Cheers,

Bill

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