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weights (if required) by engaging the hole in the
weight on the appropriate pallet assembly stem.
5.1. The weights are marked with their pressure
equivalents and are shipped outside of the valve
chamber. Verify that the appropriate weights are
being installed to provide the specified pressure
and/or vacuum setting. Refer to the nameplate
data to verify the specified factory settings.
5.2. To adjust valve settings higher than minimum,
use the weights to increase the pressure setting.
Weights are packed separately within the unit
shipping package and are labelled "PRESSURE"
and/or "VACUUM". If weights are shipped with
the unit, they should be installed onto the pallets
in the valve chamber in which they are labelled.
Gently slide the weights onto the pallet stem and
down on top of the valve pallet.
Note
Make sure that the pallet assembly stem
positively engages the stem guide hole in
the hood or cover. Each pallet assembly
must be free to move upwards, with the
pallet stem travelling into the stem guide.
6. Replace the covers and/or hood.
7. Replace wing nuts or nuts and tighten to secure
covers/hoods in position.
8. Attach the valve to the appropriate mating
flange using appropriate flange gasket which is
compatible with process conditions (customer
provided). To ensure proper function, install the
valve to a level surface, not greater than 1° off
horizontal so the pallet will move vertically. Valves
that are tilted during usage may suffer premature
damage or wear.
For proper bolt torquing of the valve connecting flange
to the piping, please refer to Tables 1 to 3.
850 and 950 Series
Smart Wireless Monitoring
Units with Smart Wireless are shipped as self-contained
and already connected. The only connection required is
installation of the transmitter battery which is intrinsically
safe and does not require a hot-work permit.
1. Install valves with the Smart Wireless monitoring
option in a similar manner to the standard PVRVs
with a few differences. Remove any cardboard or
other packaging from the inner chambers. Remove
the lid(s) and/or hood to allow insertion of the
appropriate weights during installation.
2. Remove any lid with the sensing equipment
threaded into it as a single unit. The sensor should
remain engaged with the lid during this process.
Position all sensors within 0.100 in. of the pallet
stem. Maintain this critical distance. If the sensor
location within a lid is altered, re-test the unit
to ensure proper functioning of the sensor and
transmitter. If this is the case, re-apply thread
sealant to mitigate any leakage of the sensor/
lid interface.
WARNING
!
Do not thread wireless sensor too far
into lid. Sensor may contact pallet stem
and prevent valve from opening properly.
This condition may result in equipment
damage or personal injury.
Figure 10. Model 850, Installation of Weights
9
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