ID this thru-hull valve?

[Gunni]

The ball in my galley sink drain valve cracked over the winter. I have it off and you can see it here. Pretty sure this is the OEM valve, and Beneteau specs and sells a brass valve like this to replace. Oddly enough it threads up to a 120 deg bronze fitting. Anyone know what the manufacture is on this valve and whether it is NPT or NPS. I would like to replace it with a
bronze valve. Stamped "DN32 PN 25" and I understand that to be a 1.25" valve.
thanks!
.

 

[twalker H260]

Looks like a standard 1-1/4" ball valve with a hose barb Adapter. If so it will likely be npt. Is this threading on to a thru hull? If so the thru hull is likely nps and as you have guessed this will give a tread mismatch - there are a few thruhulls that are a combination npt-nps thread.

Mainsail has a good piece on redoing thru hulls.

Groco makes an adapter for nps thru hulls to npt ball valves. If going this route check that the adapter and thru hull are compatable. - our hunter 1" oem ones were not.

 

[DougM]

looks like an ordinary ball valve (1-1/4) female pipe thread both ends with a male pipe to hose fitting threaded into it. Mgt be brass not bronze.

 

[Justin_NSA]

DN32 is just another way to say NPS 1 1/4". Should be easy to find a replacement

 

[Ron20324]

Gunni, when I put in an anchor washdown system (and also when teeing the head off the OEM sink drain) the seacock came from AYS, looked the same as yours, and I found the threads were different at each end. One screwed onto the NPS thru-hull, the other took a NPT 90-degree street ell. All my B323 seacocks are like that.

 

[Gunni]

Definitely brass, has plating of some sort. Many of my Beneteau valves look similar. What is the "SS" brand stamp?
Justin; my understanding is that DN relates to Nominal Pipe Size (NPS) and not the other NPS "national pipe straight".
I think I track down who makes this thing they can cough up the specs and thread type.

 

[twalker H260]

What's printed on the handle - often the manufacturers name is printed there rather than on the valve.

If your looking for a cheap way to check for straight or tapered pick up a couple of galvanised 1-1/4" fittings from your favourite big box store, 1 male, 1 female and try them on your parts. If tapered they will screw on many turns, if straight the galvanised will only go one full turn or so.

You are correct that the nps (nominal pipe size) conversion to DN is not the same as nps (national pipe straight).

 

[Justin_NSA]

Justin; my understanding is that DN relates to Nominal Pipe Size (NPS) and not the other NPS "national pipe straight".
I think I track down who makes this thing they can cough up the specs and thread type.

That's how I understand it too. If anyone can understand plumbing!

 

[Gunni]

Called the experts, GROCO. This is a metric valve and has British Standard Parallel Pipe (BSPP), so as Justin says, it is a straight thread, not tapered. You need to thread lock it on assembly. Which makes sense, when I could not get it to spin loose, I heated the base and it came right off, the threads coated in a locking compound.

 

[capta]

Called the experts, GROCO. This is a metric valve and has British Standard Parallel Pipe (BSPP), so as Justin says, it is a straight thread, not tapered. You need to thread lock it on assembly. Which makes sense, when I could not get it to spin loose, I heated the base and it came right off, the threads coated in a locking compound.

Not to be argumentative, but I've never run across a metric anything that had fractional inches (1 1/4) stamped on it.
Looks much like any 11/4" 303 SS ball valve available a most plumbing and marine stores, possibly even home depot.

 

[Ron20324]

Just go over to AYS for a new one. On the parts site they may have additional details.

 

[Gunni]

I've never run across a metric anything that had fractional inches (1 1/4) stamped on it.

So the DN is metric size designation and 32mm=1.25 inches. The PN is a pressure rating expressed in bars. Pretty much everyone in the freaking world uses British Standard Pipe (BSP) sizing EXCEPT the U.S....and with the DN you get BSP threads that ARE NOT compatible with National (American) Pipe Size. Different pitch, angle and threads-per-inch. Ron, AYS services says rip it all out and start over. Now I know why.

Oh, and BSP is affiliated with Wentworth tooling. Which if you been to the rodeo with old British mechanicals you know as Satan's mother.

 

[Justin_NSA]

Gunni, did you mean Wentworth or Whitworth?
As Mater says in Cars two, “they ain’t metric, they ain’t inches, you never can find a wrench to work on them”.

 

[Gunni]

Justin: Yes Whitworth!

 

[LeslieTroyer]

Cross headed screw heads are wonky also. None of the standard philips head drivers work on them darn things.

 

[Ron20324]

“they ain’t metric, they ain’t inches, you never can find a wrench to work on them”.

That's why they invented adjustable wrenches!

 

[SG]

DN is it's nominal diameter dimension in mm -- which, as noted above is approximately 1.25". The PN is it's pressure rating, I believe.

The threading of the valve is a different story.

Go to Fawcetts with the valve...get a replacement. Groco use to sell real "bronze" valves if you must. You can drive up I97 to their HQ in about 20-25 minutes. You'll be back in about an hour.

 

[Gunni]

I will have more on this in a few days after I try an installation recommended by GROCO. Bottom line is because DN fittings have different thread dimensions GROCO has developed a line of valves and fittings that can be retro-fitted to Euro boat plumbing. Most shiprights and even AYS recommend that everything be removed and start over with all new. I am trying to skin the cat by finding a valve that is a direct replacement and does not require a complete thru hull replacement.