Fisher EZL Instruction Manual page 7

Note
When upgrading Fisher
such as Types ET, ED, and ES make sure
the body is in the flow up direction.
2. Install the regulator so that the flow arrow on the
main valve matches the flow direction of process
fluid through the regulator.
3. Apply pipe compound to the external pipeline
threads before installing a regulator with threaded
end connections. Use gaskets between pipeline
and regulator flanges when installing a regulator
with flanged end connections. When installing
buttweld end connections, remove trim before
welding and make sure to use approved welding
practices. Use approved piping procedures when
installing the regulator.
WARNING
!
A regulator may vent some gas to the
atmosphere. In hazardous or flammable
gas service, vented gas may accumulate,
causing personal injury, death, or
property damage due to bursting of
pressure-retaining parts. Vent a regulator
in hazardous gas service to a remote,
safe location away from air intakes or
any hazardous location. The vent line or
stack opening must be protected against
condensation or clogging.
4. Pilots have a 1/4-inch NPT vent connection in the
spring case. To remotely vent gas from the spring
case, remove the screened vent, and connect
1/4-inch / 6.4 mm piping or tubing to the spring
case connection. The piping or tubing should vent
to a safe location, have as few elbows as possible,
and have a screened vent on its exhaust. Install
the regulator and any remote vent piping or tubing
so that the vent is protected from condensation,
freezing, or substances that may clog it.
CAUTION
To avoid freezeup because of pressure
drop and moisture in the gas, use anti-
freeze practices, such as heating the
supply gas or adding a de-icing agent to
the supply gas.
control valves,
®
5. Run a 3/8-inch / 9.5 mm outer diameter or larger
pilot supply line from the upstream pipeline to
the filter inlet as shown in Figure 3, bushing the
line down to fit the 1/4 inch threaded NPT filter
connection. Do not make the upstream pipeline
connection in a turbulent area, such as near a
nipple, swage, or elbow. If the maximum pilot inlet
pressure could exceed the pilot rating, install a
separate reducing regulator in the pilot supply line.
Install a hand valve in the pilot supply line, and
provide vent valves to properly isolate and relieve
the pressure from the regulator.
6. Attach a 1/2-inch / 12 mm piping or tubing
downstream control line to the 1/2 inch threaded
NPT control line connection on the actuator
casings. Connect the other end of the control line
to the pipeline downstream of the regulator. Do
not attach the control line near any elbow, swage,
block valve, or any other location that might cause
turbulence. Install a full port ball valve in the control
line to shutoff the control pressure when using
the bypass.
7. If a quick acting solenoid is to be installed
downstream of a regulator, the regulator and
solenoid should be located as far apart as practical.
This will maximize the gas piping volume between
the regulator and solenoid and improve the
regulator response to quick changing flow rates.
8. Consult the appropriate instruction manual for
installation of an optional pneumatic or electric
remote control drive unit. For optional remote
pneumatic loading of a 6350 or 61 Series pilot,
make the loading piping connections to the
1/4-inch NPT vent connection.
Wide-Open Monitor Regulator (Figure 4)
1. Follow the procedures in the All Installations
section, and then continue with step 2 of
this section.
2. Connect the control line of the wide-open
monitoring regulator to the downstream piping
near the working regulator control line connection.
During normal operation, the wide-open regulator
stands wide-open with the pressure reduction
being taken across the working regulator. Only
in case of working regulator failure does the
wide-open monitoring regulator take control at its
slightly higher setting.
Type EZL
7