Regarding the installation of pressure gauges and pressure transmitters

Determine whether to use threaded or flanged installation based on the installation space at the location of installation :)

For pressure gauges and pressure transmitters, the installation method of the instruments themselves is basically the same. You must be referring to the installation method of the root valve for pressure gauges & pressure transmitters. In addition to threaded and flanged connections, root valves can also be installed by welding. As for the type of connection to be used, it mainly depends on the process parameters (temperature, pressure, etc.) and the standards applicable to the pipes (American standards, Chinese standards, etc.). You can’t generalize!

It mainly depends on the properties of the medium; in vapor systems and water systems, threaded connections are generally used, while flanged connections are used for media that are prone to recrystallization

The connection method is primarily chosen based on the properties of the medium, pressure levels, leakage rates, and process requirements. Generally, for gases, steam, water, and similar substances that are not prone to condensation and have low viscosity, threaded connections are used (in cases where high pressure is not involved). For media with high viscosity, tendency to condense, strong corrosiveness, or high pressure levels and leakage rates, flanged connections are preferred.

The last edit to this post was made by zhaohh3211 on 2012-3-15 at 12:38. 1. Pressure gauges usually use threads; the small contact area of these threads results in high pressure resistance as well as good sealing properties. For example, to handle a pressure of 100 MPa, a small O-ring can be used at the root of the M14×1.5 thread, and there’s no need to use a thread wrench – leakage would be extremely difficult to occur； 2. For pressure gauges that need to be wiped and cleaned frequently, quick-install clamps are often used, for example in the food industry ； 3. Pressure gauges are only equipped with flanges when the diaphragm has a sufficiently large volume – large enough to resemble half of a buttock – making it too difficult to screw threads into it ； So, for pressure gauges, flange connection is the most disgusting and disappointing type of connection method there is.

Measure the pressure of media at high temperatures; such media crystallize when their temperature drops, so flanged pressure instruments must be used. For media that tend to clog when using pressure tap systems, flanged pressure instruments are also suitable. For those with high viscosity, flanged pressure instruments are also a good choice.