Pressure switch on a check valve?

by Kyle
(Welsh, LA.)

Is the threaded pipe between the pressure switch and connects to the tank a check valve ?

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Mar 14, 2015
Pressure switch on a check valve?
by: Bill

No.

The check valve is typically installed where the line from the pump head enters the tank.

If the check valve were in the nipple under the pressure switch, the pressure switch would not be able to sense the pressure in the tank.

Bill

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Napa Performance series Air compressor air hose is popping off switch

by Bryan
(Toledo,WA USA)

Napa Performance series Air compressor snap in air hose is popping off and will not stay in place Mosel 82356Vat

I have a 5hp 230V 1pahase Napa Performance series Air compressor and I even have the owners manual. Napa does not sell parts for their compressors (wish I new that ahead of time) and the parts diagram does not even show the hose that goes to the bottom side of the pressure switch. Anyways, I have a 1/4 in hose that comes out of the center of the top part of the tank and it goes to the bottom side of the pressure switch. It is supposed to snap into an elbow with no threads. I lost one of the washers with teeth on it (there were 2 of them) and I have tried to find replacements, I even took the sleeve, the one washer and short piece of tubing into Napa and they looked at another Compressor and they did not know where to get the parts for this fitting. I think it goes, 2 teethed washers, a barrel sleeve and the a shoulder piece to push it all in straight. I hope this makes sense as It is late here and cannot take any pictures as it is dark. Any help would be greatly appreciated. Thanks

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Nov 04, 2014
Glad to have helped..
by: Bill

Thanks for visiting my site and I'm glad to have provided what information I did towards solving your air compressor problem.

B.

Nov 04, 2014
follow up info
by: Bryan

I took your advice one step further after taking the switch off I decided to replace the switch with a permanent style screw over barrel....it took a little time to remove all the wiring and replace the gauge, the relief valve and the air line but I tested everything and it's all taken care of.....tha ks for the advice and getting me pointed in the right direction :)

Nov 03, 2014
Elbow fitting
by: Bill

You are welcome.

Start a new thread in order to include up to four photos. In that new thread, refer to the header on this one, and I can move the photos over to here, and then this thread will continue with the photos, and the newer one will be deleted after photos are moved.

Cheers,

Bill

Nov 03, 2014
follow up info
by: Bryan

Thank you bill....I like the idea of replacing the fitting under the switch...it does sound like you are spot on and I will try that today....The elbow is located under all the electrical and I will turn the power off to see if I can remove the elbow to replace.....If I have a problem with this I will take some pictures and get back to you. ...again...ha k you for your expertise. .:)

Nov 03, 2014
Napa compressor hose
by: Bill

Bryan, what you are referring to is the unloader hose, I believe.

When the pressure switch trips to off, that opens the unloader valve that is part of the switch, and allows air that is trapped over the piston to escape before the next compressor start cycle.

The part of the fitting you are referring to that's missing is the collett, I believe. It digs into the hose as it's inserted into the fitting, preventing blow off when the line is pressurized.

If you can remove the fitting from the pressure switch, you can replace with with an instant elbow fitting typically available from good compressor stores or industrial air supply outlets.

You might also check a plumbing store for a compression fitting for the same size hose, and replace the collet with the compression nut and ring, if that screws onto the fitting.

The absence of a photo makes any specific suggestions difficult as I cannot see either the pressure switch or the fitting.

Bill

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Condor Model MDR-11 switch Can't set high limit

by shaun
(KY)

MDR 11 Condor Pressure Switch Photo: http://www.vikinggroupinc.com/usrelated/general/pressureswitchadjustment.pdf

MDR 11 Condor Pressure Switch Photo: http://www.vikinggroupinc.com/usrelated/general/pressureswitchadjustment.pdf

I have a compressor driving me crazy.

I cannot set the high limit, no matter what I do the @#$% thing blows the safety valve. This is the second pressure switch and second valve.

It's a Condor Model MDR-11 switch. I have turned the main pressure screw down and the differential screw as well (several times, almost to the point of threading out). No matter what still cuts on at 40, blows safety at high 120's (150 psi safety valve)

Thoughts? Thanks!
_______________
Shaun, if the PRV is supposed to blow at 150 PSI, I wonder why it lets go at the high 120's? That's not supposed to happen, and the PRV really has nothing to do with the pressure switch. Two separate issues.

You don't indicate what the normal cut in and cut out pressure settings for your compressor were before you changed the switch. That's important to know as you want to set the new switch to the same settings (or as close as possible) to the old.

As to the adjusting of the Condor MDR-11 switch, no point in retyping here what you can find at this site on page 3:

http://www.vikinggroupinc.com/usrelated/general/pressureswitchadjustment.pdf

If the adjustment procedures do not adjust the pressure as needed, either the switch has failed, or, it's somehow installed incorrectly.

Good luck.

Bill


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Jul 08, 2014
switch
by: shaun

By the way the switch was set to 100 to 125 out of the box. I.e. cut on at 100, cut off at 125 - so should have been ok
_________________
Yes, it sure should have. Good luck with the new one.

Bill

Jul 08, 2014
bad switch?
by: Shaun

Thanks.

I referenced the Viking page when making the adjustments so I think I did that correctly.

This is the second switch and second safety valve.

As for the settings, I installed the new one, it blew and I keep dialing the main screw and the differential down. WAY down.

Blowing high 120s and this pressure was confirmed by another gauge down the line.

I guess I will buy another switch


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Air Compressor only re-starts when empty

by Steve Coats
(UK)

Air compressor pressure switch

Air compressor pressure switch

Air compressor pressure switch

Hi,

I have a small air compressor which has an issue with re-starting.

The unit does the following:

1. Starts up and builds up pressure to 6 Bar.
2. Once pressure reached compressor unloads.
3. I start using compressor but the pump only re-starts when the pressure falls to 0 Bar.
4. Repeat of 1.

There I cannot find a way of setting the minimum restart pressure.

Everything else works fine on the compressor

Cheers
Steve

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Aug 05, 2014
RE Setting the minimum restart pressure
by: Steve

Hi Bill,

Thanks for your advice.

The compressor was a 2nd Hand Purchase and has always done this.

Following your advice I removed the pressure switch cover and found it had a single adjustment on the spring. This has a + and - direction.

I adjusted the screw towards + and ran the compressor. It got to pressure then did the pressure release (6 bar dropped to approx 3 Bar)

It then restarted the compressor back upto to 6. and repeated.

So I adjusted again this time back 1/2 way towards -. It did the same but this time did not restart until the pressure dropped to 2bar.

So it looks like the screw adjusts the pressure differential.

I think the adjustment has got the cut in pressure back to a better level.

Still needs fine tuning but I think that was set wrongly.

Aug 04, 2014
Setting the minimum restart pressure
by: Bill

Steve, this is a new issue, or one that you've been experiencing with your air compressor all along?

If a relatively new issue, the symptoms would suggest that your air compressor pressure switch has failed.

Watch the points (take the cover off - be careful, live wires) as you slowly bleed the air pressure down after the compressor has reached cut out and stopped. When the pressure in the tank reaches what was the cut out, do you see any movement in the points?

Essentially, if the switch doesn't close and the points touch when the pressure reaches the cut in pressure setting, then the switch is pooched.

Bill

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