Pipe threads are mainly used to connect pipelines. The female and male threads are closely matched, and there are two types of straight pipes and tapered pipes.
In this article you will know the thread types of brass ball vales in China.
Types of pipe threads of brass ball valves by design
1. Divided by connection: there are two kinds: female thread and male thread,
2.. Divided by the sealing points: there are sealing threads and non-sealing threads.
3.. Divided by taper: tapered threads and straight threads
Types of pipe threads of brass ball valves by countries
Thread types of brass ball valves are divided into different types by countries and markets:
1. European series: G thread, R thread, Rp thread, Rc thread.
2. American series: NPT thread, NPSC thread, NPTF thread, NPSF thread, NPSI thread, PTF-SAE SHORT thread.
1. European series
1) . G threads are the general names of non-sealed threads in European countries, and they are cylindrical pipe threads with a tooth angle of 55 degrees.
2). R series threads are the common names of sealed threads in European countries, and there are different types such as R, Rp and Rc. R is a conical external thread, there are two types of R1 and R2; Rp is a sealed cylindrical internal thread; Rc is a sealed conical internal thread. The specific cooperation method is as follows:
3). BSP thread, the general name of British Standard Thread. Divided into BSPP and BSPT, BSPP (including Rp, G thread) is a non-sealed cylindrical pipe thread, and BSPT is a tapered pipe thread with a tooth profile of 55 degrees.
2. American series
1). Generally, NPT and NPSC sealing pipe threads need to be sealed with glue or raw material tape.
NPT is a general sealed conical pipe thread in the United States, with a tooth angle of 60 degrees, with internal and external threads.
NPSC is a general sealed cylindrical pipe internal thread in the United States with a tooth angle of 60 degrees. It is used in conjunction with NPT. The coordination method is as follows:
2). Dry sealed pipe thread, also called hard sealed pipe thread, NPTF, NPSF, NPSI, PTF-SAE SHORT
NPTF is a conical pipe thread with internal and external threads;
NPSF is a cylindrical internal thread (used for fuel pipelines);
NPSI is a common cylindrical internal thread;
PTF-SAE SHORT is a short SAE conical pipe thread with internal and external threads Thread.
The specific cooperation is as follows:
More details of threads of brass ball valve
NPT is the abbreviation of National (American) Pipe Thread, which belongs to the American standard 60-degree tapered pipe thread and is used for brass ball valves in North America.
NPT is the abbreviation of Pipe Thread. It is a 55-degree sealed tapered pipe thread. It belongs to the Wyeth thread family and is mostly used in Europe and the Commonwealth of Nations. Commonly used in water and gas pipe industry, the taper is 1:16.
G is a 55-degree non-thread sealed pipe thread, which belongs to the Wyeth thread family. Marked as G stands for cylindrical thread.
In addition, the 1/4, 1/2, and 1/8 marks in the thread refer to the diameter of the thread size, and the unit is inches. Insiders usually use points to refer to the thread size, one inch equals 8 points, 1/4 inch equals 2 points, and so on.
G is the general name of pipe thread. The division of 55 and 60 degrees is functional, commonly known as pipe circle.
That is, the thread is processed by a cylindrical surface.
ZG is commonly known as pipe cone, that is, the thread is processed by a conical surface. The general water pipe joints are like this, and the national standard is marked as Rc
Metric threads are expressed in pitch, while American and British threads are expressed in the number of threads per inch. This is the biggest difference between them.
Metric thread is 60-degree equilateral profile, British thread is isosceles 55-degree profile, and American thread is 60-degree.
Metric threads use metric units, and American and British threads use imperial units.
Pipe threads are mainly used to connect pipelines. The internal and external threads are closely matched, and there are two types of straight pipes and tapered pipes. Nominal diameter refers to the diameter of the connected pipe. Obviously, the thread diameter is larger than the nominal diameter. 1/4, 1/2, 1/8 are the nominal diameters of inch threads, and the unit is inches.
Thread angle: Metric and American threads are both 60 degrees, British systems are 55 degrees, TM water pipe threads are 30 degrees, SM needle threading and BC threads are also 60 degrees, metric trapezoidal threads are 30 degrees, inch trapezoidal threads are 29 degrees, and counter-shaped threads. (TW29 degrees TR and TM30 degrees)
Ordinary thread: Metric thread M; Inch W; American UNC, UNE, UNEF
Pipe thread: British system PS, PT, PF; American system NPS, NPT, NPTF, NPSM
Tuyere thread: The outer diameter of CTV, TV 1/4-20 is 1A: 0.2367-0.2489 (6.012-6.322); 2A: 0.2408-0.2489 (6.116-6.322) 3A: 0.2419-0.2500 (6.1443-6.350).
Inch thread: According to the nominal size and the number of teeth per inch to make specifications
For example, 1/4″-20, 3/4″-10, 1″-8, 1/4″-20 means the nominal size is 1/4, that is, the major diameter is 6.35mm (25.4 divided by 4=6.35) 20 teeth per inch, So on and so forth.
The Bottom Line
We have discussed thread types of brass ball vales in China, you can find correct thread types for your applications in terms of thread designs or markets and countries.
If you have brass ball valves needs, you can contact us, we will provide you with help and give you the best solution.
