Edmonton Valve & Fitting Blog

The Five Laws of Swagelok Gauges

Wed, Aug 28, 2013 @ 10:08 AM / by Taryn Hardes

Swagelok gauges come in multiple configurations and can be filled with glycerin in house


Our gauges monitor vacuum and
positive system pressures up to
15,000 psi.  

pdf iconDownload the Pressure Gauges

1. Double gauge pressure over system pressure

You always want a gauge's pointer to operate in the centre third of the dial. This is the area where the gauge is most accurate. Doubling the gauge pressure also allows for additional over-pressure problems in the system. You can usually go about 15% above the rated gauge pressure before harm is done to the gauge.

2. Liquid fill where vibration is present

Liquid filling is required when vibration is present in your system. The liquid dampens the movement and changes the frequency of the tube tip and lubricates the movement. No liquid filled gauge in stock? No problem. Edmonton Valve associates are happy to fill the gauge you need.

3. Always use a restrictor when pressure spikes are present

Using a restrictor when pulsating is present in a system reduces the amplitude of the pressure spikes and pressure pulses. In high pulsation applications, a super restrictor, which is a 1/2 inch long, is reccommended.

4. Hang a gauge upside down when high pressures and flows are present

When high velocity or high pressure flow is present and valves are opening or closing, it can cause the fluid to stop, the gauge to empty, and then start flowing again. The fluid will "slam" into the gauge causing a spike, and eventually, a premature failure. Hanging the gauge keeps it full of fluid and will prevent any high velocity problems.

5. Never mount the gauge directly above a high temperature source

Always keep a pressure sensor off to the side of high temperature vessels or pipes. This allows convection air currents to draw cooler air to flow around the gauge and prevents overheating.

For part numbers and further information about Swagelok pressure gauges, download the Pressure Gauges: Industrial and Process catalogue.

Topics: Measurement Devices

Taryn Hardes

Written by Taryn Hardes