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IOM
Model: 43T Pressure Relief Valve
PAGE 6 OF 10
4.9 Valve size 8" and 10" are equipped with adjustable needle valve to allow presetting of the valve
closing speed. By turning the needle valve screw (#5, fig.2B) on the pilot valve bottom, adjust the
valve response. Turn:
Clockwise (while facing the screw) to decrease (-) the closing speed of the main valve
or
Counterclockwise to increase (+) the closing speed of the main valve.
Repeat the Starting-up procedure, sections 4.1 – 4.4.
5 Maintenance and Inspection Test
Warning: Do not turn off the water supply, to make repairs, without notifying local
security guards or firefighting officials.
5.1 In any of the following inspections or testing procedures, if an abnormal
condition exists, see Troubleshooting for possible cause and corrective action.
5.2 The 43T valve is to be inspected, tested and maintained in accordance with the
Maintenance Instructions of the plant, this Maintenance Manual, as well as the
Standard for the Inspection, Testing and Maintenance of Water-Based Fire
Protection Systems, NFPA 25.
6 Weekly Inspection
6.1 The system should be inspected under flow conditions.
6.2 Check that the main valve, pilot system, accessories, tubing & fittings, are all in good
condition, damage free and not leaking.
6.3 The fastening nut, of the pilot valve (3 in fig.2) adjusting screw, should be fastened tightly.
6.4 For circulation type installations, verify that sufficient water flows through the valve when fire
pump is operating at shut-off pressure (churn) to prevent the pump from overheating.
6.5 Verify that the pressure upstream of the relief valve fittings in the fire pump discharge piping
does not exceed the pressure for which the system components are rated.
7 Monthly Inspection and Test
7.1 Complete Weekly Inspection.
7.2 During the monthly fire pump flow test, verify that the pressure relief valve is correctly adjusted
and set to relieve at the appropriate pressure and closes below the pressure setting.