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This is what a boiler relief valve says on the lable under the lever. It's important to read and understand the instructions and warnings printed on this lable.
|Matthews N.C.||CONBRACO Industries, INC||Operating Instructions|
If adding water to
equipment, DO NOT ALLOW water to flow through
safety relief valve as sediment or debris may be
deposited on the seating surface.
To achieve topmost performance and maximum service life, it is necessary to maintain a proper pressure margin between the set pressure of the safety relief valve and the equipment operating pressure.
The recommended pressure differential between the pressure relief valve set pressure and the boiler operating pressure should be at least 10 PSI, or 25% of the boiler operating pressure, whichever is greater.
Failure to maintain this operating margin may result in water leakage past the seat and an accumulation of deposits on the heating surface.
Excessive deposits may prevent the valve from operating properly, and a dangerous pressure build-up and equipment rupture may result.
|MAINTENANCE AND TESTING|
|CAUTION! Before testing, make certain
discharge pipe is properly connected to valve
outlet and arranged to contain and safely
dispose of equipment discharge (see
Under normal operating conditions a "try lever test" must be performed every two months. Under sever service conditions, or if corrosion and/or deposits are noticed within the valve body, testing must be performed more often.
A "Try Lever test" must also be performed at the end of any non-service period.
Test at or near maximum operating pressure by holding the test lever fully open for at least 5 seconds to flush the valve seat free of sediment and debris. Then release lever and permit the valve to snap shut.
If the lever does not activate, or there is not evidence of discharge, DISCONTINUE USE OF EQUIPMENT IMMEDIATELY AND CONTACT A LICENSED CONTRACTOR OR QUALIFIED SERVICE PERSONNEL.
Neither Conbraco Industries, Inc., nor it's agents assume any liability for valves improperly installed or maintained.
DO NOT REMOVE THIS TAG!
Note this tag also includes the following warning, I did not
include the warning above because it may no longer apply to boiler
relief valves, laws have changed and lead has been removed from
WARNING: Thai product contains lead, a chemical known to the state of California to cause cancer or birth defects or other reproductive harm.
(Plumber: California law requires that this warning be given to the consumer)
To see if your boiler relief valve contains lead check the lable on your pressure relief valve. if the tag has been removed, assume it contains lead.