Dixon Bayco 2180 Інструкція з технічного обслуговування та експлуатації - Сторінка 8

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2180 Air Relief Valve Repair Kits

Testing

The opening pressure of this valve may indicate differently depending

on the test equipment, instrumentation and air supply used. Where

possible the valve should be tested using identical conditions and the

same equipment as will be found on the system to be protected.

When this is not practical the test set-up should, as closely as

possible, approximate the conditions of the system to be protected.

Additionally the calibration of your test system should be checked

against your actual system by comparing the opening pressure of the

same relief valve on both systems.

1. Ensure that your air supply is rated to at least 100 PSI and that at

least 250 SCFM of air flow is available. If the air supply flow rate is

much less than the rated flow rate of the relief valve, the relief valve

will appear to relieve at a lower pressure than the rated value. This

discrepancy arises because the relief valve is a spring device that is

designed to lift slightly before the set relief (opening) pressure, but

will not flow a significant volume of air until the air reaches the

opening pressure. If the SCFM flow rate is low the air relief valve will

relieve a volume of air at lift pressure that cannot be made up by the

supply source, therefore the tester will not be able to reach the

opening pressure setting. In this situation the maximum pressure

read on the tester pressure gauge will be the initial lift pressure and

not the rated opening pressure.

All test equipment should be rated suitable for use with

high pressure.

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

3. Ensure that all relevant instrumentation is correctly calibrated.

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.

4. Screw the pressure relief valve to be tested into a 2" port on your

test system using pipe sealant on the air relief valve threads.

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

pressure to rise.

877.582.3569

2180 AIR RELIEF VALVE RK