Startup And Adjustment - Emerson 63EG Instruction Manual

the main valve and from the pipe tee (key 24,
Figure 12) or pipe cross (key 35, Figure 12) as
long as the 1/4 in. NPT tapping in the side of the
main valve body is plugged.
WARNING
!
Types 63EG and 1098-63EGR relief
valves vent gas from the main valve
outlet and from the pilot exhaust. In
hazardous or flammable gas service,
personal injury, death or property
damage may occur due to fire or
explosion of accumulated vented gas.
To prevent such injury or damage, vent
the gas to a safe location. Design and
install exhaust piping to guard against
excessive flow restriction. Protect this
piping from condensation or debris that
can clog it.
For shutdown safety on backpressure
applications, install vent valves
immediately upstream and downstream
of the main valve.
3. If system operation is necessary during
maintenance or inspection, install isolating and
vent valves as needed. If upstream protection
is not provided for the entire unit, an optional
P590 Series or Type 252 pilot supply filter
installed upstream of the pilot may help protect it
from clogging.
4. A relief valve always must be installed so that
the pilot will exhaust properly and into a safe
place. The pilot spring case vent must be kept
open to atmospheric pressure. Protect this
vent from icing, moisture or other blockage as
required. If the pressed-in vent assembly (key 27,
Figure 12 or 13) remains in the pilot exhaust port
(connection A, Figure 7), it must be pointed down
if possible or otherwise protected.
5. If the exhaust is to be piped to the main valve
outlet or remotely vented, remove the vent
assembly and install obstruction-free tubing or
piping with a minimum number of bends into the
1/4 in. NPT pilot exhaust connection. Provide
protection on a remote vent by installing a
screened vent cap into the remote end of the
vent pipe.
Types 63EG and 1098-63EGR
6. If using pipe, apply a good grade of pipe compound
to the male pipe threads before making the
connection. Install tubing or piping into the
appropriate pilot connection.
7. Set pressure is defined as the pressure at which
the pilot starts-to-discharge. The set pressure of
a unit is adjusted by changing the control spring
compression on the pilot.
8. The pilot is factory-set for the set pressure
specified on the order. If no setting is specified,
set pressure is factory-set at midrange of the
spring range.

Startup and Adjustment

Key numbers are referenced in Figure 12.
1. With proper installation and adjustment completed,
slowly open the upstream shutoff valve while using
gauges to monitor pressure. On backpressure
applications using an isolating bypass, also open
the downstream shutoff valve and close the
bypass valve. Inlet pressure may be monitored
either by using the optional installed gauge
(key 29) or by removing the pipe plug (key 29) and
temporarily installing a gauge.
2. If set pressure adjustment is necessary, monitor
inlet pressure with a gauge during adjustment.
Adjustment
Key numbers are referenced in Figures 14 and 15.
The 6358 Series relief pilots are adjusted by removing
the closing cap (key 12), loosening the locknut
(key 11) and turning the adjusting screw (key 10)
clockwise to increase or counterclockwise to decrease
the set pressure. When the required set pressure is
maintained for several minutes, tighten the locknut to
lock the adjusting screw and install the closing cap.
Shutdown
Relief Installations
Slowly close the upstream shutoff valve. Release all
pressure from the main valve and pilot by opening
the upstream vent valve or by slightly loosening one
of the compression fittings on the pilot supply tubing
or actuator tubing until the trapped pressure starts
bleeding out. Once all pressure is released, tighten the
compression fitting.
7