Dixon 2180 Petunjuk Penyesuaian & Kalibrasi - Halaman 5
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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
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