We produce fire hose valve often encounter customers ask: what kind of thread? The thread of the fire hose valve is an important thing, if it is processed wrong, it is very bad.
Our company ANT Fire produces the most common thread of water belt valve BSP thread, its full name is British Standard Pipe Thread, is the British Standard Pipe Thread, belongs to the category of Whitworth thread. BSP thread is divided into two types according to the shape: cylindrical pipe thread BSPP (British Standard Pipe Parallel) and conical pipe thread BSPT (British Standard Pipe Taper).
1、BSPP-British Standard Cylindrical Pipe Threads
The corresponding pipe thread is called “conical pipe thread”, which is a common name and a standard designation in textbooks. For various reasons, BSPP is also known by a variety of other names. Among them, BSPF (British Standard Pipe Fitting), BSPM (British Standard Pipe Mechanical), PS (British Standard Pipe Straight) and so on is the more common name. But with the beginning of ISO standardization, these various designations are replaced by a simple and clear letter G, which is G thread. Therefore, BSPP, BSPF, BSPM, PS are now collectively referred to as G thread. This is also the most common inlet thread for fire hose valves.
2、BSPT-British tapered pipe threads
BSPT-British conical pipe thread, also known as PT thread, is only used for general sealing coupling.The old standard of BSPT is BS21, while in the new standard BSEN10226-1, it is replaced by R thread. So R thread is the collective name of BSPT and PT thread.
The letter R in R thread is derived from the German word rohr (meaning “pipe” in German). r thread is actually a series, the common ones are Rp, Rs, Rc, R1 and R2. the details are as follows:
Rp-Fractional Sealed Cylindrical Female Threads
Rs-Fractional Sealed Cylindrical Male Threads
Rc-Fractional sealed conical female threads
R1-Fractional sealed conical male thread, used in conjunction with Rp, i.e., Rp/R1 “column/cone” fit
R2-Fractional sealing tapered male thread for use with Rc, i.e. Rc/R2 “taper/cone” fit
