Common Troubleshooting Tips
If a regulator does not seem to operate properly, and the
response is either very sluggish or non-existant:
As a test, disconnect the vent line connection
local to the regulator. If hunting or other related
problem stops, the problem is due to some type of vent
line restriction. The focus should now turn to resolving
the vent line problems. This could be anything from
a bee's nest in the vent piping, to a rag or debris
creating a blockage, to excessive lengths or vent piping
which creates this restriction.
If a regulator does not seem to lock-up and it is designed
to lock-up (not all regulators are lock-up design, but all
of the Bryan Donkin USA regulators are designed to lock-up).
Lock up during no flow conditions should occur within 7"
to 14" wc of the set point for regulators less than 2
PSI outlet, and less than 1 PSI of set point for a higher
The most common cause of failure to lock-up
is either debris lodged in the valve orifice preventing
the valve from closing all the way, or, damage to the
valve orifice such as a nick caused by welding slag
or other foreign matter. Carefully disassemble the diaphragm
case from the valve body local to the valve body by
loosening the union or bolted flange assembly. Carefully
lift the diaphragm off the valve body retaining the
o-ring for when you reassemble the regulator. Inspect
the valve orifice from above, the edge should be sharp
and free of nicks. The plunger that presses against
the valve orifice is attached to the diaphragm assembly
and should also be free of damage. A slight round impression
is typically present and this is where the orifice pushes
into the plunger seat and seals.
free to contact your Local Bryan Donkin Distributor or call
866-4 MY REGS for additional support.
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