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Old 07-02-2011, 10:11 PM   #1
williaty
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Default Compressor Petcock Leaking. What can I do about it?

I just bought a new 60gal compressor from Lowes. It took me a couple of weeks to get the wiring and plumbing ready for it and I fired it up for the first time tonight. Ran through the break-in procedure, tested the safety systems, etc. Played with it for a little bit and then shut it off for the night. I opened the drain petcock on the bottom to drain the water and it puked all over the place like it was supposed to. However, when I closed the petcock all the way, it's still hissing very slightly. Every other time I had closed it, it sealed properly. So I opened it a bit and then closed it again. Still hissed. Opened it all the way, let it vent a couple of seconds then closed it again. Still hissing.

Returning this compressor isn't really an option. I'd have to un-do the wiring I soldered together, find a way to lift it back onto my trailer, etc. Is it possible or even a good idea to replace just the petcock? Is there some other trick I'm missing?
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Old 07-02-2011, 10:13 PM   #2
Wesley B
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Default Re: Compressor Petcock Leaking. What can I do about it?

Teflon tape.
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Old 07-02-2011, 10:13 PM   #3
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Default Re: Compressor Petcock Leaking. What can I do about it?

Replace it
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Old 07-02-2011, 10:14 PM   #4
williaty
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Default Re: Compressor Petcock Leaking. What can I do about it?

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Teflon tape.
That makes no sense. It's leaking through the center of the petcock. How would teftape help?
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Old 07-02-2011, 10:16 PM   #5
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Default Re: Compressor Petcock Leaking. What can I do about it?

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Originally Posted by williaty View Post
I'd have to un-do the wiring I soldered together, find a way to lift it back onto my trailer, etc.
uhh....solder is not an acceptable method of splicing line voltage wiring.
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Old 07-02-2011, 10:18 PM   #6
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Default Re: Compressor Petcock Leaking. What can I do about it?

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That makes no sense. It's leaking through the center of the petcock. How would teftape help?
And how am I supposed to know it leaking through the center?
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Old 07-02-2011, 10:19 PM   #7
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Default Re: Compressor Petcock Leaking. What can I do about it?

Replace it.
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Old 07-02-2011, 10:22 PM   #8
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Default Re: Compressor Petcock Leaking. What can I do about it?

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uhh....solder is not an acceptable method of splicing line voltage wiring.
The terrible wiring this was sold with has barely-crimped spade connectors on the motor and pressure switch wiring. I soldered the wire to the to the spade connectors (which are then screwed into the terminals, weird setup from the factory) on the advice of a professional electrician who was worried about the spades loosening due to thermal cycling and (because of the design of the inside of the switch) eventually being able to touch the hots together inside the switch.
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Old 07-02-2011, 10:24 PM   #9
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Default Re: Compressor Petcock Leaking. What can I do about it?

90deg street elbow, 6-8in nipple, ball valve. sorted.
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Old 07-02-2011, 10:28 PM   #10
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Default Re: Compressor Petcock Leaking. What can I do about it?

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90deg street elbow, 6-8in nipple, ball valve. sorted.
x2 after replacing a few on my old compressor, this was the first thing I did on the new one.
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Old 07-02-2011, 10:31 PM   #11
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Default Re: Compressor Petcock Leaking. What can I do about it?

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90deg street elbow, 6-8in nipple, ball valve. sorted.
Listen to ZRX61 + coming out of the ball valve attach a hose barb, and add a length of hose to allow you to drain the tank with less mess.
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Old 07-02-2011, 10:33 PM   #12
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Default Re: Compressor Petcock Leaking. What can I do about it?

Go to home depot and get a new drain valve. While you're at it, extend the drain so you don't have to reach all the way under the tank anymore.
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File Type: jpg Drain.jpg (50.9 KB, 113 views)
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Old 07-02-2011, 10:41 PM   #13
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Default Re: Compressor Petcock Leaking. What can I do about it?

ZRX61, that is a good suggestion that merits further investigation. Are those just normal plumbing fittings or something specially rated?
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Old 07-02-2011, 10:42 PM   #14
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Default Re: Compressor Petcock Leaking. What can I do about it?

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Go to home depot and get a new drain valve. While you're at it, extend the drain so you don't have to reach all the way under the tank anymore.
Just like that, except pass on the little knurled screw-thingy and just get a ball valve like ZRX61 said... quarter turn and it's open, quarter turn and it's closed.
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Old 07-02-2011, 10:44 PM   #15
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Default Re: Compressor Petcock Leaking. What can I do about it?

take it back or you could install a ball valve its a toss up!!!
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Old 07-02-2011, 10:46 PM   #16
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Default Re: Compressor Petcock Leaking. What can I do about it?

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Originally Posted by j.c.whitney View Post
ZRX61, that is a good suggestion that merits further investigation. Are those just normal plumbing fittings or something specially rated?
Just regular plumbing stuff. I used brass.
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Old 07-02-2011, 10:50 PM   #17
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Default

Definitley remove it and replace with ball valve, nipple, and street elbow as others have said. This was the first thing I did when I bought my kobalt 30 gal a few weeks ago. You can find all these fittings in the plumbing area. I used all 1/4 fittings for mine, not sure what yours uses.
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Old 07-02-2011, 11:06 PM   #18
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Default Re: Compressor Petcock Leaking. What can I do about it?

Quote:
Originally Posted by ZRX61 View Post
90deg street elbow, 6-8in nipple, ball valve. sorted.
I agree, this is the best solution. The original drain valve on my very noisy Craftsman was leaky and I replaced it with a couple of street elbows, a ball valve, and a 6 inch nipple. By the way, when I took the original drain off, the only problem was that the o-ring had gotten pushed out of place and wasn't sealing properly. So you may be able to reuse your original drain valve. But, I wouldn't recommend it. Here are pics of mine:
Attached Images
File Type: jpg 0216011249.jpg (133.8 KB, 86 views)
File Type: jpg 0216011249a.jpg (142.4 KB, 68 views)
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Old 07-02-2011, 11:15 PM   #19
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Default Re: Compressor Petcock Leaking. What can I do about it?

Not worth returning it due to the cheap petcock. Replacing the petcock with the same type is not going to last long either. I have the same 60 gal. compressor from Lowes and had already planned to install the elbow, nipple and ball valve because I don't like having to get down on all fours to drain it. I hope you raised yours up off the floor enough to install the elbow. I did not and wound up having to raise it with spacers and change the piping connections to allow for the new height. Do yourself a favor and put the ball valve in. You will not regret the additional small cost.
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Old 07-03-2011, 12:17 AM   #20
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Default Re: Compressor Petcock Leaking. What can I do about it?

It also saves you from getting bitten by the BlackWidow living under the tank..
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