ML435 | v23
Page
18
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• Remove small cover plate.
• Whilst holding the central adjustment screw in position using the hex key, loosen the retaining nut.
• Adjust the hex key clockwise to increase, or anti-clockwise to reduce the lift off pressure.
• Before testing, retighten the locking nut whilst holding the adjustment screw in place.
• Carry out the commissioning tests to check the correct setting of the relief valve after adjustment.
• The adjustment is sensitive and it is recommended that a
1
/
4
turn (maximum) adjustments are applied
between tests.
Re-calibration of the Pressure Sensors
The brass nozzle on the sensor is sealed into position using Loctite thread sealant. If the thread has seized up,
remove to a safe area and heat slightly to soften prior to making any adjustment. This prevents potential damage
to the brass of the nozzle.
• Disconnect pipe work from the sensor, including pipe located below the sensor.
• Remove sensor by unscrewing anti-clockwise.
• The nozzle is located under the sensor.
• The adjustment is sensitive, turn the nozzle in
1
/
8
of a turn steps.
• Turn clockwise to reduce the pressure setting and anti-clockwise to increase.
• Replace sensor, screwing clockwise.
• Reconnect all pipe work.
Orifice Plate
Allen Screw and Lock NUT
Removing the small cover plate
to set the RLV opening pressure
