Types 66, 66Z, and 66ZZ
6
Install the Types 66, 66Z, and 66ZZ regulators
horizontally with the spring case vertically above the
valve body. Other orientations change the regulator
set point and controlled pressure range due to the
weight of the internal parts.
If threaded connections are used, apply a good grade
of pipe compound to only the male pipeline threads.
If flanged connections are used, use good bolting
practices and suitable gaskets.
If continuous operation of the system is required
during inspection and maintenance, install a three-
valve bypass around the regulator. If an upstream
strainer is not provided for the entire unit, an optional
filter may be installed on the optional external control
line to help protect the pressure sensing parts.
!
WaRning
The Type 66, 66Z, or 66ZZ regulator
upper diaphragm casing vent must
remain clear and unobstructed. a
clogged vent may cause equipment
damage or personal injury due to
improper regulator functioning. install
and maintain the regulator so that
dust, insects, and weather conditions
do not clog or obstruct the vent.
The vented gas must not be allowed
to accumulate where it can cause
a hazardous condition. in pit,
underground, or indoor installations,
inlET PRESSuRE
OuTlET PRESSuRE
aTMOSPhERiC PRESSuRE
Figure 5.
Standard Steel Body Operational Schematic
A6550
COnTROl SPRing
DiaPhRagM
EXTERnal
COnTROl linE
SEaT Ring
ValVE SKiRT
ValVE STEM
