Swagelok Threads

lizardland · 30th October 2007, 18:17

Anyone know what the thread on a Swagelok tube fitting is? I've just spent 15quid on the wrong flaming parts... apparently it isn't NPT...

Cheers,

Stuart

Stephane · 30th October 2007, 18:48

Swagelok tube fitting thread is not conical so it can't be NPT.
Here is a good guide to read: (don't forget paracetamol pills!)
http://www.swagelok.com/downloads/we...N/MS-13-77.PDF

**Dave Sutton** · 30th October 2007, 20:21

Are you talking about the thread where the nut threads onto the fitting? If so, it depends on the size, but they are a very "usual" straight SAE thread, nothing special.

What are you trying to connect together? I can spec out what you need if you let me know what the application is.

Dave

lizardland · 30th October 2007, 22:05

Quote: (Originally Posted by Dave Sutton)

Are you talking about the thread where the nut threads onto the fitting? If so, it depends on the size, but they are a very "usual" straight SAE thread, nothing special.

What are you trying to connect together? I can spec out what you need if you let me know what the application is.

Dave

Hi Dave,

here's a not very good pic:

It looks simple enough, KISS hose < shutoff valve < KISS valve. But the problem is I thought I was getting an ebay bargain with the shutoff valve and never noticed that the ad said 1/8" tube fitting rather than the KISS standard 1/4" tube. I thought I'd cracked it with a couple of tube adaptors from my local Swagelok office, I had a female to 1/8 tube for the KISS valve connection and male to 1/8 tube for the hose connection. As the old Scottish proverb goes, shite.

Cheers,

Stuart

**Dave Sutton** · 31st October 2007, 13:16

Ok...

You have 1/16 NPT on the KISS valve. DEFINATELY a non-standard thread. Gordon then used a 1/16 NPT to 1/4 inch tube fitting, so that 1/4 tube can be installed into that fitting. At the ends of the hoses he used, he had them terminated in 1/4 tube, and when the tube was inserted into the adapter and swaged down, the hose then had the threaded ferrule now swaged onto it that let it be threaded onto the adapter.

To make the fitting on the KISS valve be "complete" again (meaning it's ready to accept a 1/4 tube again), you need 1 front ferrule, 1 back ferrule, and 1 nut for a 1/4 tube fiitting. You can buy these by the "each", or buy ANY 1/4 tube fitting, remove the nut and ferrules, and stick them onto the adapter that's installed in the KISS valve. Now you're back to square 1.

IF that valve was a 1/4 tube end valve, all you would do would be to cut a 2 inch length of tube, stick it into the valve and swage it (1 and a quarter turns by wrench), and then do the same thing on the fitting on the KISS valve.

IF the valve is other than 1/4 tube.... you're more or less buggered. There are clunky ways to make it fit, but it'll never be right. See if Swagelok has a 1/8 tube to 1/4 tube adapter. if so, it'll work OK...

Those valves, BTW, are just a few bucks new from McMaster-Carr. They will be Parker instead of Swagelok, will fit, and are just as nice.

Dave

lizardland · 31st October 2007, 15:13

Cheers, Dave. Unfortunately McMaster no longer ship to the UK as it would have been my 1st stop otherwise. The Swagelok valves are around $80US at UK prices.

Anyway, after an hour of head scratching last night I think I've come up with the solution:

- on the downstream side, I've got a 1/8 tube to 1/4 NPT adaptor so to make the KISS hose fit I'm putting on a female NPT fitting with a tube adaptor on the other end. Remove the nut and ferrule for re-use and screw the stem on to the KISS hose.

- on the upstream side, I've got a 1/8 tube to NPT-F adaptor on there. So I've added a male NPT fitting with a tube stub on it. Use the nut and ferrule to hook that on to the KISS valve.

In theory...

I need to pick up the extra parts tomorrow so I'll see what the reality is.

Cheers,

Stuart

benhoskin · 1st November 2007, 02:41

Yeah that sound like it would work, you cant reuse the ferule, but beware the 1/8" tube adapters are very easy to bend.
I would save the money on the adapters and buy a 1/4 tube valve and use a short section of tube to join the ball valve to the kiss valve.

**Dave Sutton** · 1st November 2007, 13:51

Quote: (Originally Posted by benhoskin)

I would save the money on the adapters and buy a 1/4 tube valve and use a short section of tube to join the ball valve to the kiss valve.

Me too.

Sell the old valve on EBay and buy the right one. Otherwise you'll always know it's a sore spot on your rig.

Dave

JCdesign97 · 1st November 2007, 14:37

Quote: (Originally Posted by lizardland)

... Unfortunately McMaster no longer ship to the UK as it would have been my 1st stop otherwise. The Swagelok valves are around $80US at UK prices.

Or you could just have some kind soul in the US order what you need from McMaster and send to you, handle final tally with PayPal or whatever. Rather that than have something cobbed together with your kit ...

gibbogeo · 1st November 2007, 19:20

Quote: (Originally Posted by Dave Sutton)

IF the valve is other than 1/4 tube.... you're more or less buggered. There are clunky ways to make it fit, but it'll never be right. See if Swagelok has a 1/8 tube to 1/4 tube adapter. if so, it'll work OK...

Two of this kind of adapter, if they exists, will cost more than selling the wrong valve on ebay and buy a new correct one.

30th October 2007, 18:17	#1 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,177	Swagelok Threads Anyone know what the thread on a Swagelok tube fitting is? I've just spent 15quid on the wrong flaming parts... apparently it isn't NPT... Cheers, Stuart __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
(Online)

30th October 2007, 18:48	#2 (permalink)
Stephane Hey! Ho! Let's go! Current Rebreather/s: rEvo Other Rebreather/s: rEvo Join Date: Nov 2005 Location: Nantes - France Posts: 716	Re: Swagelok Threads Swagelok tube fitting thread is not conical so it can't be NPT. Here is a good guide to read: (don't forget paracetamol pills!) http://www.swagelok.com/downloads/we...N/MS-13-77.PDF __________________ Stéphane Hammer-rEvo powered!
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30th October 2007, 20:21	#3 (permalink)
Dave Sutton Living on Animal Farm Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,486	Re: Swagelok Threads Are you talking about the thread where the nut threads onto the fitting? If so, it depends on the size, but they are a very "usual" straight SAE thread, nothing special. What are you trying to connect together? I can spec out what you need if you let me know what the application is. Dave __________________ . "All animals are equal, but some animals are more equal than others" Professional Small Boy: Never Successfully Cubicled.
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30th October 2007, 22:05	#4 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,177	Re: Swagelok Threads Quote: (Originally Posted by Dave Sutton) Are you talking about the thread where the nut threads onto the fitting? If so, it depends on the size, but they are a very "usual" straight SAE thread, nothing special. What are you trying to connect together? I can spec out what you need if you let me know what the application is. Dave Hi Dave, here's a not very good pic: It looks simple enough, KISS hose < shutoff valve < KISS valve. But the problem is I thought I was getting an ebay bargain with the shutoff valve and never noticed that the ad said 1/8" tube fitting rather than the KISS standard 1/4" tube. I thought I'd cracked it with a couple of tube adaptors from my local Swagelok office, I had a female to 1/8 tube for the KISS valve connection and male to 1/8 tube for the hose connection. As the old Scottish proverb goes, shite. Cheers, Stuart __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
(Online)

31st October 2007, 13:16	#5 (permalink)
Dave Sutton Living on Animal Farm Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,486	Re: Swagelok Threads Ok... You have 1/16 NPT on the KISS valve. DEFINATELY a non-standard thread. Gordon then used a 1/16 NPT to 1/4 inch tube fitting, so that 1/4 tube can be installed into that fitting. At the ends of the hoses he used, he had them terminated in 1/4 tube, and when the tube was inserted into the adapter and swaged down, the hose then had the threaded ferrule now swaged onto it that let it be threaded onto the adapter. To make the fitting on the KISS valve be "complete" again (meaning it's ready to accept a 1/4 tube again), you need 1 front ferrule, 1 back ferrule, and 1 nut for a 1/4 tube fiitting. You can buy these by the "each", or buy ANY 1/4 tube fitting, remove the nut and ferrules, and stick them onto the adapter that's installed in the KISS valve. Now you're back to square 1. IF that valve was a 1/4 tube end valve, all you would do would be to cut a 2 inch length of tube, stick it into the valve and swage it (1 and a quarter turns by wrench), and then do the same thing on the fitting on the KISS valve. IF the valve is other than 1/4 tube.... you're more or less buggered. There are clunky ways to make it fit, but it'll never be right. See if Swagelok has a 1/8 tube to 1/4 tube adapter. if so, it'll work OK... Those valves, BTW, are just a few bucks new from McMaster-Carr. They will be Parker instead of Swagelok, will fit, and are just as nice. Dave __________________ . "All animals are equal, but some animals are more equal than others" Professional Small Boy: Never Successfully Cubicled. Last edited by Dave Sutton : 31st October 2007 at 13:21.
(Offline)

31st October 2007, 15:13	#6 (permalink)
lizardland Yak Current Rebreather/s: MK 15.X Home Build Other Rebreather/s: Classic Kiss Home Build Join Date: Mar 2005 Location: North... Posts: 1,177	Re: Swagelok Threads Cheers, Dave. Unfortunately McMaster no longer ship to the UK as it would have been my 1st stop otherwise. The Swagelok valves are around $80US at UK prices. Anyway, after an hour of head scratching last night I think I've come up with the solution: - on the downstream side, I've got a 1/8 tube to 1/4 NPT adaptor so to make the KISS hose fit I'm putting on a female NPT fitting with a tube adaptor on the other end. Remove the nut and ferrule for re-use and screw the stem on to the KISS hose. - on the upstream side, I've got a 1/8 tube to NPT-F adaptor on there. So I've added a male NPT fitting with a tube stub on it. Use the nut and ferrule to hook that on to the KISS valve. In theory... I need to pick up the extra parts tomorrow so I'll see what the reality is. Cheers, Stuart __________________ Can you imagine drifting along in the sea with your mouth open and a load of f***ing plankton going in? You'd like it, would you? www.westons-cider.co.uk Azerbaijani Association of Technical Divers Publicity Officer and Goat Wrangler
(Online)

1st November 2007, 02:41	#7 (permalink)
benhoskin New Member Current Rebreather/s: Not Bought Yet Other Rebreather/s: Not Bought Yet Join Date: Sep 2006 Posts: 5	Re: Swagelok Threads Yeah that sound like it would work, you cant reuse the ferule, but beware the 1/8" tube adapters are very easy to bend. I would save the money on the adapters and buy a 1/4 tube valve and use a short section of tube to join the ball valve to the kiss valve.
(Offline)

1st November 2007, 13:51	#8 (permalink)
Dave Sutton Living on Animal Farm Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Classic Kiss rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,486	Re: Swagelok Threads Quote: (Originally Posted by benhoskin) I would save the money on the adapters and buy a 1/4 tube valve and use a short section of tube to join the ball valve to the kiss valve. Me too. Sell the old valve on EBay and buy the right one. Otherwise you'll always know it's a sore spot on your rig. Dave __________________ . "All animals are equal, but some animals are more equal than others" Professional Small Boy: Never Successfully Cubicled. Last edited by Dave Sutton : 1st November 2007 at 14:02.
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1st November 2007, 14:37	#9 (permalink)
JCdesign97 My unit can beat up yours Current Rebreather/s: Optima Other Rebreather/s: Join Date: Mar 2007 Location: PA, USA Posts: 350	Re: Swagelok Threads Quote: (Originally Posted by lizardland) ... Unfortunately McMaster no longer ship to the UK as it would have been my 1st stop otherwise. The Swagelok valves are around $80US at UK prices. Or you could just have some kind soul in the US order what you need from McMaster and send to you, handle final tally with PayPal or whatever. Rather that than have something cobbed together with your kit ... __________________ Cheers, John
(Online)

1st November 2007, 19:20	#10 (permalink)
gibbogeo kiss addict Current Rebreather/s: Classic Kiss Dolphin Home Build Other Rebreather/s: Dolphin Home Build Join Date: Sep 2005 Location: italy Posts: 308	Re: Swagelok Threads Quote: (Originally Posted by Dave Sutton) IF the valve is other than 1/4 tube.... you're more or less buggered. There are clunky ways to make it fit, but it'll never be right. See if Swagelok has a 1/8 tube to 1/4 tube adapter. if so, it'll work OK... Two of this kind of adapter, if they exists, will cost more than selling the wrong valve on ebay and buy a new correct one.
(Online)

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