Why Is There A Loop Between the Pressure Gauge and the Gauge Pipe

When connecting a pressure gauge to a pipeline, a loop must be added between the pressure gauge and the pipeline connection. But why is this necessary?



Pressure gauge with needle valve

This component connecting the pressure gauge to the pipeline is called a gauge loop (or simply a loop), formally known as a buffer tube.

There are two forms of gauge loops: one is a circular loop, and the other is a U-shaped loop.

gauge loops

The purpose of adding a gauge loop is to protect the internal transmission mechanism of the gauge from damage caused by the temperature and corrosiveness of the medium. Typically, if the medium is corrosive to a certain extent, a gauge loop must be added. When the temperature of the medium exceeds 60°C, a gauge loop must also be added. However, if the pressure gauge is installed on a clean domestic water system, it is not necessary to add one.

Additionally, the gauge loop serves to reduce vibration and impact, and provides some heat dissipation for higher temperature mediums, thereby protecting the pressure gauge and reducing the impact of temperature on gauge accuracy. The damping screws at the joint holes of some pressure gauges function by reducing the flow area to achieve throttling and buffering effects, primarily useful for medium pressure pulses.

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