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Atmospheric relief valve type 1100
Installation and maintenance instructions
8. Setting and tests
Test bench and Test fluid
The quality and condition of the shop test bench is paramount to obtaining proper test results. In
particular, the test bench must be free of leaks and the test fluid must be clean. Solids or other
foreign material in the test medium will damage the seating surfaces of the atmospheric relief valve
being tested.
The test pressure gage must be calibrated and have a range proper to the pressure level of the
valve setting. Set pressure should fall within the middle third of the dial range of the test gage.
The test fluid shall be air or nitrogen for valves used on gas and vapor service.
Set pressure adjustment
1.
Put the valve on the appropriate test stand.
2. Before making any adjustments reduce the pressure under the valve seat to at least 50%
below the stamped set pressure on the valve nameplate. This will minimize the chance of
an inadvertent valve opening. Prevent the spindle from rotating with a wrench to avoid seat
damage due to turning of the disc on the nozzle seat.
3. Screw the adjusting bolt (11) to its original position "L" recorded during disassembly and lock it
with the adjusting bolt nut (12).
4. Increase the pressure underneath the disc and check the opening pressure. Standard allowable
tolerance for set pressure is +/- 0.14 barg (+/- 2 psig).
5. To properly adjust the valve, turn the adjusting bolt (11) clockwise to increase set pressure or
counter clockwise to reduce set pressure.
6. Retighten the adjusting bolt nut (12) following each adjustment.
7. When the specified set pressure has been reached, pop the valve three to four times to check
its regularity.
8. The 1100 soft seated atmospheric relief valves are bubble tight from vacuum up to 90% of set
pressure. Check the tightness at 90% of the set pressure.
9. Finalize the valve assembly as above specified.
10. Seal the valve and identify the valve with a plate showing the authority conducting the
adjustments.
Pentair reserves the right to change the contents without notice
ETS-07002-EN
page 5
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