Emerson Fisher 67C Series - Startup and Adjustment; Maintenance

chemicals or other foreign material) orient the vent
to the lowest possible point on the spring case or
otherwise protect it.
Inspect the vent hole regularly to make sure it is
not plugged. Spring case vent hole orientation
may be changed by rotating the spring case with
respect to the body. A 1/4 NPT spring case vent
may be remotely vented by installing obstruction-
free tubing or piping into the vent. Protect the
remote vent by installing a screened vent cap on
the remote end of the vent pipe.
6. For use in regulator shutdown, install upstream
block and vent valves and downstream block and
vent valves (if required) or provide some other
suitable means of properly venting the regulator
inlet and outlet pressures. Install a pressure gauge
to monitor instruments on startup.
7. Apply a good grade of pipe compound to the
external pipe threads before making connections,
making sure not to get the pipe compound inside
the regulator.
8. Install tubing fitting or piping into the 1/4 NPT
inlet connection on the body (key 1) and into the
1/4 NPT body outlet connection.
9. The second 1/4 NPT outlet can be used for
a gauge or other use. If not used, it must
be plugged.
Installing a 67CF Series Regulator in an
Existing Installation
When installing a 67CF Series regulator in an existing
installation, it may be necessary to use spacers
(key 34, Figure 13) to adapt the installation. If the
mounting bolts are too long, place a spacer on the
bolt (see Figure 13). To be sure the regulator is
secure, the bolts should have at least two full threads
of engagement.
Startup and Adjustment
KeynumbersarereferencedinFigures3through9.
1. With proper installation completed and
downstream equipment properly adjusted, slowly
open the upstream and downstream shutoff valve
(when used) while using pressure gauges to
monitor pressure.
!
WARNING
To avoid personal injury, property
damage or equipment damage caused
by bursting of pressure containing
parts or explosion of accumulated
gas, never adjust the control spring
to produce an outlet pressure higher
than the upper limit of the outlet
pressure range for that particular
spring. If the desired outlet pressure
is not within the range of the control
spring, install a spring of the proper
range according to the diaphragm parts
maintenance procedure.
2. If outlet pressure adjustment is necessary, monitor
outlet pressure with a gauge during the adjustment
procedure. The regulator is adjusted by loosening
the locknut (key 18), if used, and turning the
adjusting screw or handwheel (key 19) clockwise
to increase or counterclockwise to decrease the
outlet pressure setting. Retighten the locknut to
maintain the adjustment position.
Shutdown
First, close the nearest upstream block valve and
then close the nearest downstream block valve
(when used). Next, open the downstream vent valve.
Since the regulator remains open in response to the
decreasing downstream pressure, pressure between
the closed block valves will be released through the
open vent valve.
Maintenance
Regulator parts are subject to normal wear and
must be inspected and replaced as necessary. The
frequency of inspection and replacement of parts
depends on the severity of service conditions and
applicable codes and government regulations. Open
the Type 67CF, 67CFR, 67CFS or 67CFSR drain valve
(key 2) regularly to empty accumulated liquid from the
dripwell (key 5).
Note
If sufficient clearance exists, the body
(key 1) may remain mounted on other
equipment or in a line or panel during
maintenance unless the entire regulator
will be replaced.
5
67C Series