Is the domestic general water pipe thread ZG thread, or G thread, and in which occasions is the G th

The G thread is the old standard cylindrical pipe thread.

The thread is the same as the new standard RP cylindrical pipe. ZG is the conical pipe thread, the new standard defines the internal thread as RC, the external thread as R, the G thread or RP thread is the round is the internal thread, the same with the G thread or RP thread external thread, the thread of the cylindrical inner pipe thread and the cylindrical outer pipe thread can not be sealed, the seal is sealed by the end face pressing rubber ring, and the matching type is a column-column fit. In addition, the G thread or RP thread is an internal thread, which can be sealed with a thread with the R cone external thread in medium and low pressure, and the mating type is a column-cone fit.

Special attention should be paid to the ZG internal thread or RC internal thread can not be matched with G and RP external thread, that is, because G or RP internal thread can not only form a column and column fit with G or RP external thread, but also form a column cone fit with ZG or R external thread, there are many types of choices, the internal thread is G or RP, and the cone-cone fit formed by the internal thread of ZG or RC and the external thread of R or ZG is generally used for high pressure and will not appear on the water pipeline.

Generally, the thread of the water pipe is the G thread (R rc), which is very widely used, such as galvanized water pipes at home, large fire pipes, etc.

ZG, commonly known as pipe cone, is a 55-degree sealed conical pipe thread, that is, the thread is processed by a conical surface, and the general water pipe joint is like this. G is a 55 degree cylindrical thread non-threaded seal pipe thread.

g stands for non-sealed cylindrical pipe thread, 55 degree tooth profile.

3 4 refers to 3 4 inches, and the number of teeth in each is 14, pitch.

for, the thread tooth is high.

The basic diameter of the thread: the large diameter and the small diameter.

Inch threads. The size of the thread is marked with the imperial system, and it is divided into two kinds of cylinders and cones according to the shape;According to the angle of the tooth type, it is divided into two types. The 8 mark in a thread refers to the diameter of the thread size in inches.

One inch is equal to 8 points, 1 4 inches is 2 points, and so on.

G is a 55-degree non-threaded seal pipe thread that belongs to Wyeth.

Thread family, labeled g for cylindrical threads.

The 8 mark in a thread refers to the diameter of the thread size in inches. One inch is equal to 8 points, 1 4 inches is 2 points, and so on. 1 4, 1 2, 1 8 are inch threads.

The nominal diameter in inches.

The thread of G1 2 is a half-inch cylindrical pipe thread, with an outer diameter of millimeters, a middle diameter of millimeters, a bottom diameter of millimeters, a tooth profile of 55 degrees, 14 teeth per inch, and each inch is equal to millimeters.

There are three main differences:

1. The sealing is different.

zg means that the profile angle is 55 degrees, the taper is 1:16, and there is no gap between the internal and external threads.

The inner and outer threads of the G thread are cylindrical pipe threads, and there is no sealing after fitting;

rTightened thread tightening. The top and bottom of the tooth are all rounded, and the taper of the taper thread is 1:16.

2. The role is different.

ZG thread is mostly used in the pipeline connection of high-pressure and high-temperature systems, there is no gap between the internal and external thread profiles, and the deformation of the thread profile is not used to ensure the tightness of the thread pair.

The G thread only plays a connecting role in the pipeline, and can be used for low-pressure pipelines under static load with the help of sealing rings;

There are two kinds of fits for the R thread, one is a cylindrical internal thread and a conical external thread, and the other is a conical internal thread and a conical external thread, which is used for high pressure and impact occasions.

3. The models are different.

Zg refers to the conical pipe thread with a tooth profile angle of 55 degrees (tooth angle of 55 degrees), G refers to the non-threaded sealed pipe screw filial piety pattern, and R refers to the pipe thread sealed with threads.

1. The 8 mark in the general pipe thread refers to the diameter of the thread size, and the unit is inches. Insiders usually use points to call the thread size, one inch is equal to 8 points, equal to the hidden wheel, 1 8 inches is 1 point, 1 4 inches is 2 points.

2. The pipe thread is the thread located on the pipe wall for connection, and there are 55 degree unsealed pipe threads and 55 degree sealed pipe threads. It mainly uses high carrying Hu to connect the pipeline, so that the internal and external threads are closely matched, and there are two kinds of straight pipes and conical pipes.

G is a 55 degree non-threaded seal pipe thread, which belongs to the Wyeth thread family Marked as G stands for cylindrical thread National standard can be consulted GB , PT, G are all pipe threads

The imperial thread is marked with the inch system for the thread size, which is divided into two types: cylindrical and conical according to the shape; According to the angle of the tooth type, it is divided into two types. The 8 mark in a thread refers to the diameter of the thread size in inches. One inch is equal to 8 points, 1 4 inches is 2 points, and so on.

G means tooth angle of 55 degrees. 5/8"The meaning is that the diameter of the pipe is about 5 8", and the thread of the pipe thread has a large diameter.

The m in the thread annotation is the meaning of middle in English, which represents the thread of medium screwing length. n indicates the thread screw length, which is medium, generally omitted and not written, and s, l denotes short and long screw lengths.

Use RP to denote cylindrical internal threads; Use r to denote the conical male thread. Pipe thread feature code for non-threaded seals: The thread feature code uses g to indicate cylindrical pipe threads; Z is used to denote the tapered pipe thread.

The difference between ZG and G and R threads is: different seals, different processing, and different uses.

First, the seal is different.

1. ZG thread: ZG thread is a non-threaded sealed pipe screw dismantling and excavation pattern.

2. G thread: G thread is a pipe thread with non-threaded sealing.

3. R thread: R thread is a pipe thread sealed with a thread.

Second, the processing of different arguments.

1. ZG thread: ZG thread is processed by conical surface.

2. G thread: G screw with stupid pattern is processed through the cylindrical surface.

3. R thread: R thread is processed by cylindrical surface.

Third, the use is different.

1. ZG thread: ZG thread is used for occasions where the thread is used as the sealing surface.

2. G thread: G thread is used for low-pressure static load occasions.

3. R thread: R thread is used for high pressure and impact occasions.