3-Way Selector Valve with BSPT threads

[carlylelk]

Does anyone know where I could find a Selector valve (takes from Port A or Port B and puts the flow to port C and it looks like a plumging T)...with BSPT (British Standard Pipe Taper). The USA uses NPT thread. I've looked all over the internet and don't find anything in the states. It's in a tight spot so I can't use BSPT to NPT adapters.

Much appreciated,
Duane

[Nicholson58]

I assume you mean for water or oil, probably bronze. I found most manufacturers such as Parker offer various end configurations. Try also McMaster Carr. If you want large valves such as sanitary or wet exhaust try Banjo Valves Valves | Banjo Corp - Liquid Handling Products.

Be careful using yellow brass. There is too much zinc in the alloy and it will be unsuitable for sea warmer.

[Janos]

You should be able to use the NPT available fittings. The only difference between the two threads are the thread angle. The NPT has a 60 degree angle, while the BSPT uses a 55 degree. A little extra tape will more than makeup for the difference since both are tapered to 3/4" per ft.

[Rod B]

Bps and npt are interchangeable up to 1 1/2"

[Rod B]

That should be bsp

[Kokanee]

To clarify the difference between BSP & NPT:

BSP threads are angled at 55 degrees, NPT are 60 degrees. Not a big deal under non critical low pressure applications.

If the fittings are 1/4" or 3/8", there are 18 and 19 threads per inch on NPT and BSP. They will screw together but the threads will be damaged and it will likely leak.

On 1/2" and 3/4" fittings, both have 14 threads per inch, so if your 3 way valve is 1/2" or 3/4" you may be ok, if you use a good quality sealant or quality teflon tape.

On fittings between 1" and 2" inclusive NPT have 11 1/2' threads per inch, BSP has 11 threads per inch; close and sometimes they will seal- but I wouldn't mix the threads on fuel lines or anything critical like that.

If the fittings are stainless steel. I wouldn't recommend bsp & npt of any size. The threads will gall and bind up.


Here's a listing of other sizes. NPT vs. BSP Pipe | Pipe and Hose