Weight Information; Valve Repair - Emerson Enardo 860 Series Instruction Manual

Weight Information

Note
Spring-loaded valves can have a weight-
loaded component.
The Fisher™ pressure/vacuum relief valve can achieve
various pressure and vacuum settings in units of
ounces per square inch (oz./sq. in.) or inches of water
column (in. w.c.) when weights are used. Standard Fisher
weight-loaded valve pallets installed without weights or
springs reach minimum settings of
1/2 oz./sq. in. or 1 in. w.c. The pallets' setting is stamped
into the seal support located on the bottom side of the
pallet. The pallet's setting of 1/2 oz./sq. in. or 1 in. w.c. is
etched into the support.
When a valve requires a setting higher than the
1/2 oz./sq. in. or 1 in. w.c. basic pallet setting, use weights
to increase the pallet's set pressure. Fisher weights also
come in units of ounces per square inch (oz./sq. in.) or
inches of water column (in. w.c.). The individual setting
of each weight is either etched or imprinted into the
weight. Emerson offers several different sizes of pressure/
vacuum relief valves. To ensure that the right weight is
placed on the right pallet, keep in mind that the weights
and pallets that go together will have the same outside
diameter. Standard Fisher weights allow the user to stack
in increments of 1/2 oz./sq. in. or 1/2 in. w.c.
Your Fisher pressure/vacuum relief valve shipment
includes prepackaged weight kits used to achieve the
proper settings for the valve you ordered. The package
labeled "PRESSURE" goes on the pallet in the pressure
chamber. The package labeled "VACUUM" goes on
the pallet in the vacuum chamber. All of the weights in
these packages should be installed. If one or neither of
these packages is included with your order, then they are
not needed.
Enardo 860 and 960 Series
If the pressure and vacuum weights are mixed together,
sort and reorganize the weights.
When installing weights for the Fisher pressure/vacuum
relief valve, check the required settings for the valve
located on the tag attached to the unit. Then add weights
to the pallet to achieve the required setting. For example,
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; the pallet
alone achieves 1/2 oz. setting. Therefore, the weights to
be added must total the remaining balance of the required
setting, which in this example is 5-1/2 oz. Hence, the
valve pressure setting is the sum of the settings of the
pallet and the weights.

Valve Repair

On occasion, valve housings or internal components
can be damaged due to accidents, improper usage
or wear. With Fisher's modular design and unique
replaceable seat, many repairs to damaged valves
can be made on site instead on a remote repair site.
This feature causes minimal downtime if there is an
equipment breakdown or malfunction.
A damaged valve may require replacement of the
entire pressure or vacuum assembly, or it may require
a single component, such as a valve seat or pallet.
All Fisher seats and pallets are tested for their sealing
capabilities before they are shipped from the plant.
Fisher assemblies and components can be quickly and
easily installed. Once installed, the valve is ready for
continued dependable operation.
Contact your local Sales Office with any questions
or additional assistance you may need for repairing
your valve.
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