No, NPT threads are not compatible with NPSM threads. A pipe with NPT threads tapers slightly, while an NPSM-threaded pipe does not taper.
NPT = pipe Briggs standard = Pipe NFT and NFC and ASAE = bolt
national pipe thread
npt, national pipe thread, is a standard for threads on a screw. I (not a plumber) don't believe "npt valve" makes sense , but probably refers to a valve which has npt threading. Yes, a NPT Valve would be a valve with pipe threads as opposed to a sweat valve which has solder connections. There are several other type of piping connections too.
National Pipe Threads or the Briggs Standard NFT = National fine threads NCT National corse threads ASAE America society of auto engineer threads etc
In regards to pipes and tubing, NPT stands for national pipe thread. NPT is the American standard for threaded pipes and fittings regarding the tapered threads.
Called Briggs Standard AKA NPT and the other threads NOT normally used in plumbing is NFT and ASE threads
no its just called ASPT or NPT= National Pipe thread
Question is other way round FPT not FTP Female Pipe Thread FPT fittings are equivalent to "National Pipe Thread" (NPT) ones, but different from National Standard Free-Fitting Straight Mechanical Pipe Thread (NPSM) fittings.
IPS- Iron Pipe Size (Threaded Pipe) Standard pipe threads. Female IPS is internal pipe threads, male IPS are external pipe threads. Also known as "NPT" or "NPS". CC- Copper Connection (Soldered, aka Sweat Connection)
Full form of NPT is "National Pipe Thread"
National Pipe Tap, the angled self sealing thread of a pipe fitting
Thread angle is different (55° vs 60°).NPT threads are flattened at the peaks and valleys, while BSPT threads are rounded.Threads per inch (TPI) is different for two (except for a couple of cases).