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A If the supply pressure is turned OFF without changing the input signal, the solenoid valve built into the regulator continues to operate while generating a buzzing sound, affecting the life of the solenoid valve.
This is why the power needs to be turned OFF.
When the source pressure is down, and the input signal to the regulator is 0% (0 MPa), the solenoid valve stops operating.
Why is it stated in the precautions for the ITV series electro-pneumatic regulator that the power should be turned OFF when the supply pressure is cut?
Also, is there anything else that needs to be done?
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A IR series precision regulators constantly release air into the atmosphere through the bleed hole for precise adjustment.
This amount should not exceed 4.4 L/min (ANR) for IR1000/2000 series regulators and 11.5 L/min (ANR) for IR3000 series regulators.
For new IR1000-A/2000-A/3000-A series regulators, 1 L/min (ANR) is the max. amount.
Check to confirm whether the leakage is actually bleed air before taking any further steps.
Note) Refer to the “Specifications” section of the catalog for bleed measurement conditions.
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A How to address oil carryover from an oil mist separator?
Verify the filtration rating (upgrade to 0.3μm for fine oil aerosols).
Check for excessive inlet oil concentration (ensure upstream lubricators are set correctly).
Replace the filter element if past its service life (typically 5,000–10,000 operating hours).
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A Check for:
Inlet pressure fluctuations: Install a pressure stabilizer or larger air receiver tank.
Worn regulator diaphragm: Replace with an OEM diaphragm kit (avoid generic parts).
Loose connections: Tighten fittings or replace damaged O-rings/NPT seals.
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A Possible causes:
No drain valve or auto-drain installed (add a manual/auto-drain for continuous moisture removal).
Inlet air not pre-treated (install a refrigeration dryer upstream for high-humidity environments).
Filter element clogged (replace or clean according to the maintenance schedule).
