BSPP or BSPT threading for brass end fittings of control valve
BSPP or BSPT threading for brass end fittings of control valve
(OP)
Hi All,
I'm want to select BSP threading brass fittings for our control valve tubings.
I have two options:
1. All male & female threading in BSPP.
2. All male in BSPT and all female threading in BSPP.
can anyone suggest which is the best option to select.
FYI: Application is for water flow control valves.
Please find the attached photo for reference.
I'm want to select BSP threading brass fittings for our control valve tubings.
I have two options:
1. All male & female threading in BSPP.
2. All male in BSPT and all female threading in BSPP.
can anyone suggest which is the best option to select.
FYI: Application is for water flow control valves.
Please find the attached photo for reference.
RE: BSPP or BSPT threading for brass end fittings of control valve
RE: BSPP or BSPT threading for brass end fittings of control valve
To my knowledge, "BSPP to BSPP" fitting will have chance of leakage more as compared to "BSPT (Male) - BSPP (Female)" fitting.
Please correct me if I'm wrong.
RE: BSPP or BSPT threading for brass end fittings of control valve
If you're using tapered threads (BSPT) the threads themselves are designed to create a seal. You typically need tape and dope to assist the sealing as engagement depth and fit are critical to the seal, and why using tapered threads on both sides is a bit better fit, but tapered male will still seal in a parallel female thread. Since the engagement depth can vary based on manufacturing tolerances and other factors the fit of the system can sometimes vary enough that assembly prints can't be followed exactly - but again as tugboat mentioned, since the thread engagement has an acceptable range you can work within you will have some ability to choose the final rotational position and "clock" the fitting during assembly.
I've never chosen a BSPT male x BSPP female arrangement to know how well it works, but it's shown as acceptable.
RE: BSPP or BSPT threading for brass end fittings of control valve
Both types of threads will initially seal reliably if put together correctly. Any leaks are primarily due to workmanship rather than the thread form.
RE: BSPP or BSPT threading for brass end fittings of control valve
We do not combine tapered and parallel threads.