Section III: Service and Maintenance
Safety Relief Valve
Installation Instructions
This valve must be mounted in a vertical, upright position
directly to a clean, tapped opening located at the top of
the equipment. Under no circumstances should there be
a flow restriction or valve of any type between the safety
relief valve and the pressure vessel.
Be certain that all connections - including the valve inlet -
are clean and free from any foreign material.
Use pipe compound sparingly, or tape, on external
threads only.
The Btu/hr or lb/hr rating of the safety valve must equal
that of the equipment to which it is installed.
Warning!
The safety relief valve may discharge large
amounts of steam and/or hot water during operation.
Therefore, a discharge line must be installed to reduce
the potential for bodily injury and property damage that:
√ is connected from the valve outlet with no obstructions
and directed downward to a safe point of discharge.
√ allows complete drainage of both the valve and the
discharge line.
√ is independently supported or securely anchored so as
to avoid applied stress on the valve.
√ is as short and straight as possible.
√ terminates freely to atmosphere when any discharge
will be clearly visible and is at no risk of freezing.
√ terminates with a plain end that is not threaded.
√ is constructed of a material suitable for exposure to
temperatures of 375° F or greater.
√ is of a pipe size equal to or greater than that of the valve
outlet over its entire length.
Do not cap, plug, or otherwise obstruct discharge pipe
outlet!
Operating Instructions
DO NOT ALLOW
water to flow through a safety relief
valve as sediment or debris may be deposited on seating
surface if adding water to a kettle. Excessive deposits
may prevent the valve from operating properly and a
dangerous pressure buildup and equipment rupture may
result.
Maintenance and Testing
CAUTION!
Make certain discharge pipe is properly
connected to valve outlet and arranged to contain and
safely dispose of boiler discharge before testing (see
“Installation Instructions”).
Under normal operating conditions a “try lever test” must
be performed every two months. Under severe 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 lift lever does not activate, or there is no evidence of
discharge, discontinue use of equipment immediately
and contact a licensed contractor or qualified service
personnel.
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