I recently acquired a used fisher dual stage regulator and have a question about repair... I'm not sure if it even needs it but where would I turn if I needed to find replacement parts? I've seen rebuild kits for single stage regulators but nothing for dual stage. Can someone point me in the right direction?
^ not necessarily. Figure about $50 for parts and labor. You pretty much have a new unit again. Again, if you can find a replacement cheaper... Also it might depend what type of reg you have. I wouldn't personally just toss a htp-500 or something because a diaphragm has a leak.
if it is a old model fisher scientific regulator, too old, that thing is probably a re-branded Matheson model 8 regulator and was made in the 60's.
try to avoid Matheson model-8, used are well worn up and fail rate is high, CGA 320 nipple is Old Harris standard 1/2-27 thread, really hard to find, and the repair kit/parts are virtually non exist.
for the most popular welding regulators, parts are easy to find, but still, repair cost for the regulator is at least $75 to fix internal problem(local airgas). For high value regulators, if it is not the current model(out of warranty), it is better to scrap because high cost to repair. Repair kit/parts are expensive and have to be done by professionals, a couple hours labor charge will bring the repair bill up.
That is why I saw a a couple barrels full of defective high value regulators at local Airgas, where I got the CO2 tank swap. Those defective regulators were simply discarded and would be eventually scrapped for metal.
What Bettatail says goes for lots of things. It is just cheaper to throw them out than to pay for repairs. If you can find the parts at the right price and if you do the work yourself, there is a chance it will pay. But that has lots of "ifs" in it.
Thanks for all of the responses everybody! Like I said, I'm not even sure if it needs repairs, but I just wanted to know where to turn in case I did need help. I'll post a picture of the beauty tonight. It's a fisher scientific but I couldn't tell you a model number.
Yeah, that's an old Matheson 8. If it's broken now (gauges can be replaced pretty cheaply), it might not be worth trying to get repaired. I've bought several Matheson 8's at $30 shipped or less. They're pretty common.
The good news is that if it's not actually broken, there's probably nothing that you'll do to it, given normal use for our purposes, that will kill it. And at least somebody took the time to shine it up
As for a CGA320 nipple, it's possible they're hard to find, but the first place I checked - Western Enterprises - had them. It's a 1/2-27 thread, and was a couple bucks more than a standard 1/4" NPT thread CGA320 nipple ...which bought the total to a whopping 6 bucks or so at my local AirGas (which is a Western Enterprises retailer). Here's the website if anybody's interested: http://www.westernenterprises.com/en...a_fittings.php ...the 1/2"-27 nipple is about 1/3 the way down the page. Model #CO-7.
Yours is the same as matheson model 8, the cga 320 stem thread is 1/2-27, western enterprise part number for this stem is WE-CO-7, good luck.
Picture is the same regulator, spent days worked on it and finally tested, found out it was slowly leaking due to the internal damage. Same faith as other two Matheson model-8 I had, really slow leak could barely notice, but no matter how small the problem is, couldn't use them and no way to fix. They are all in the junk box now, waiting to be scrapped.