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Types 1808 and 1808A
installation
WARning
!
installing a Type 1808 or 1808A where its
capabilities can be exceeded or where
proper operation might be impaired
may cause personal injury, property
damage, or leakage due to bursting of
pressure-containing parts or explosion of
accumulated gas or liquid. To avoid such
conditions, install the Type 1808 or 1808A
backpressure regulator or relief valve
where service conditions are within the
unit capabilities given in the Specifications
section and unit is protected from
exposure to physical damage and/or
corrosive substances.
1. When installing the relief valve or backpressure
regulator, make sure that the system installation
complies with applicable local, state, and federal
codes and regulations.
2. Use qualified personnel when installing, operating,
and maintaining the relief valve or backpressure
regulator. Before installing the unit, inspect the
main valve body, pilot, and pipelines for any
damage or foreign material that may have
collected. Apply pipe compound to the external
pipeline threads only. Do not use pipe compound
on any internal threads.
3. The relief valve or backpressure regulator may
be installed in any position as long as pipeline flow
complies with the flow arrow on the main valve
body (Type 1808) or runs in through the bottom
connection and out the side connection
(Type 1808A). Superior performance may be
obtained by disconnecting the pilot supply tubing
from the elbow (key 36, Figures 3 and 4),
removing the elbow, installing 1/4 NPT pipe plug
into the lower casing (key 2), and connecting the
pilot supply tubing to an upstream location.
WARning
!
Types 1808 and 1808A relief valves or
backpressure regulators vent gas or
liquid from the main valve outlet, pilot
exhaust, and pilot vent. in hazardous
or flammable gas or liquid service,
4
personal injury or property damage may
occur due to fire or explosion of vented
gas or liquid that has accumulated.
To prevent such injury and damage,
provide piping or tubing to vent the gas
to a well ventilated location. Also, when
venting a hazardous gas or liquid, piping
or tubing should be located far enough
from any buildings or windows so as not
to create a further hazard.
Protect the main valve body, pilot
exhaust, and pilot spring case vent
against anything that could clog
them. For safety during shutdown of
backpressure regulators, install vent
valves immediately upstream and
downstream of the main valve.
4. The pilot exhaust may be piped directly into the
main valve outlet (if the exhaust is to be retained,
as in liquid service) or vented to the atmosphere.
In either case, the diameter of the exhaust line or
stack should be as large as practical with a
minimum number of bends or other restrictions.
When installing this unit in relief service, be sure
to consider the jet thrust effect that will occur when
it relieves.
Overpressure Protection
Relief ranges are from 3 to 125 psig (0,21 to 8,6 bar).
The individual spring range of your relief valve is
stamped on the nameplate.
Maximum inlet pressures depend upon body material
and temperature. See the Specifications section
for the maximum inlet pressure of the valve. The
valve should be inspected for damage after any
overpressure condition.
Startup
1. With installation completed, slowly open the
upstream shut-off valve while using a gauge to
monitor inlet pressure. On backpressure
applications using an isolating bypass, open the
downstream shut-off valve, and close the
bypass valve.
2. If set pressure adjustment is necessary, adjust a
Type 6358 or 6358B pilot by following the
procedures in the adjustment section.
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