The choice of pressure tapping and thread

Pressure gauge is the use of different types of deformation of the elastic element under the action of pressure to measure pressure or vacuum. The deformation through the drive mechanism, and finally by the pointer driving instructions. Pressure gauge is simple in structure, cold resistant, heat resistant, easy to use, wide measuring range, the characteristic of high accuracy, is widely used in production and living. It is how to install? Pressure tapping according to your working pressure range, are low-voltage high pressure, central Asia, PT NPT, PT teeth means inch pipe taper thread, tooth profile Angle of 55 degrees. NPT teeth means American work taper thread, tooth profile Angle of 60 degrees, domestic also calls the taper pipe threads. In domestic engineering, pressure gauge is generally selected metric thread, such as M20X1. 5, on a little table with M14X1 diameter. 5 or M10x1 thread. Other projects can use inch thread, such as the G1/2, small gauge diameter of G1/4 or G1/8, both are straight thread, is the bottom of the seal, when installation should be selected according to different working condition of different gasket. In some NPT threads are used in joint venture or foreign patent, commonly used is 1/2 NPT, small table size is 1/4 NPT, 1/8 of the NPT, this is the American standard thread, conical clasp. This thread by thread seal, don't need a gasket seal, domestic often intertwined with four fluorine, because domestic NPT clasp the machining accuracy is not high. Common table diameter is 100 mm, 150 mm, small diameter is 63 mm. After a detailed instructions, whether you choose to pressure tapping and thread on this isit?