Emerson Enardo 850 Series - Valve Repair

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15
850 and 950 Series
North America Only
If the pressure and vacuum weights are mixed together,
sort and reorganize the weights.
When installing weights for the Enardo pressure/
vacuum relief valve, check the required settings on the
tag attached to the valve. Add weights to the pallet to
achieve the required setting. If the relief valve’s setting
is 6 oz./sq.in., add weights with the total setting of
5-1/2 oz./sq.in. to the valve since the pallet’s setting
alone is 1/2 oz./sq.in. Hence, the valve pressure setting
is the sum of the settings of the pallet and the weights.
The relief pressure or vacuum setting is equal to the
sum of the pallet assembly and individual calibration
weight equivalent pressure value.
WARNING
Valve Repair
Make sure line is free of hazardous
vapors before installing or servicing
the valve.
Observe all applicable safety
requirements. Only qualied and trained
personnel shall perform maintenance
functions in hazardous locations.
All replacement parts must be provided
by Emerson.
Remove the valve from the tank before attempting any
repairs beyond pallet assembly and weight maintenance
as described on Maintenance section.
Most repairs will consist of replacing pallet seals, lid
gaskets and in some cases, the body gaskets. The seats
are also replaceable if the need arises. These repairs are
relatively simple and can normally be handled by plant
maintenance personnel using common hand tools.
Most valve maintenance can be performed by the
customer or by a valve repair facility. See Table 4 for the
proper maintenance of the relief valve parts.
In most cases, it is not necessary to return the valves to
the factory. If the valve needs to be tested and certied
at a specied pressure and/or vacuum, return it to the
factory or send it to a qualied valve repair facility that is
capable of performing the necessary tests in accordance
with API Bulletin 2521 recommendations.
Contact your local Sales O󰀩ce with any questions or
additional assistance needed for repairing your valve.
Table 4. Valve Maintenance
PART REPLACEMENT
Pallet Seals
Simple replacement. Provided with gasket repair kit
along with other gaskets. The pallet seals are fragile and should
be handled carefully to avoid damage. They must never be folded
or creased. Never use abrasive cleaners on a pallet seal.
Pallet Assemblies
Drop-in replacement. Requires removal of lid and replacement of gasket.
Again, care must be taken not to damage the seals.
Body Gaskets Requires disassembly. Provided with gasket repair kit
Seats Requires gasket to be replaced as well.
Weights
Requires removal of lid and replacement of O-ring on
Model 850 Pipe-Away valves. The customer must be
careful to install the proper weights in the right location.