Dixon 2180 Adjustment & Calibration Instructions - Page 5

Browse online or download pdf Adjustment & Calibration Instructions for Control Unit Dixon 2180. Dixon 2180 7 pages. Adjustable air relief valves

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2180 and 3180 Adjustable Air Relief Valves

All test equipment should be rated suitable for use with

high-pressure air.

2. Ensure that all supply lines and connections are at least ¾".

3. Ensure that all relevant instrumentation is correctly calibrated.

4. The most accurate results will be obtained when the relief valve to

be tested is connected to an accumulator or air receiver tank such

that the dynamic effect of the compressor system is reduced. Failure

to do so may result in an indicated opening pressure lower than the

actual.

5. Screw the pressure relief valve to be tested into a 2" (for 2180), or

3" (for 3180), port on your test system using pipe sealant on the air

relief valve threads.

6. Open supply pressure isolation valve and allow air receiver tank

pressure to rise.

Tank pressure should be allowed to rise at a rate of approximately

2psi / second. Flow rates greater than this will cause the relief valve

to flutter rapidly. In this condition the valve plate inertia may cause

the apparent opening pressure to be lower than the calibrated value

and will make accurate testing impossible.

The relief valve will start to discharge at a pressure slightly below the

rated value, at this pressure some hissing may be evident but the

pressure in the tank should continue to rise (assuming air source

provides a sufficient flow rate). The valve opening pressure (RATED

VALUE) can be read on the tester pressure gauge when the valve

plate (11) reaches an equilibrium (open) position.

If the air supply provides a flow rate in excess of the

maximum flow rate capacity of the relief valve at the relieving

pressure, the valve will not be able to relieve a sufficient volume

of air to prevent tank pressure from continuing to rise. In this

condition serious personal injury and extensive property

damage may occur due to over pressurization of test

components.

2180 and 3180 ARV

877.582.3569