INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
!
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
A6557
Type 627OSX must be installed in a horizontal position
and the mechanism box must be above or below the
body. It is recommended to install vents upstream and
downstream of the regulator between the shutoff valves.
Pipe supports should be used for flanged Type 627OSX
units due to weight.
See Type OS2 Instruction Manual (D102778X012) for
additional information.
5. If continuous operation is required during inspection
or maintenance, install a three-valve bypass around
the regulator.
A regulator may vent some gas to the
atmosphere. In hazardous or flammable gas
service, vented gas may accumulate and
cause personal injury, death or property
damage due to fire or explosion. Vent a
regulator in hazardous gas service to a
remote, safe location away from air intakes
or any hazardous area. The vent line or
stack opening must be protected against
condensation or clogging.
6. Position the body (key 1) and/or diaphragm spring case
(key 29) so it will not collect moisture or debris into the
screened vent. If the regulator requires repositioning,
refer to the Body Area Maintenance Procedures and/or
the Diaphragm and Spring Case Area Maintenance
Procedures in the Maintenance section to reposition the
screened vent for the application.
Perform steps 7 through 9 for Types 627M, 627HM,
627MR, 627MOSX and 627HMOSX regulators only:
7. A Type 627M, 627HM, 627MR, 627MOSX or
627HMOSX regulator requires a downstream control
line. Install the control line before putting the regulator
into operation.
8. Ensure that the downstream control line piping is at
least 3/8 in. / 9.5 mm or larger outside diameter tubing
and connected to a straight section of outlet piping 10
diameters downstream of the regulator.
9. A hand valve should be installed in the control line. This
hand valve can be used to throttle down and dampen
outlet pulsations in control pressure which may cause
instability or cycling of the regulator.
Remote Vent Line Installation
All 627 Series regulators have a vent assembly installed in the
3/4 NPT spring case vent opening. The vent assembly can be
removed to install a remote vent line if necessary. Remote vent
lines must have the largest practical diameter. It should be as
short as possible with minimum number of bends or elbows.
Protect the remote vent opening against entrance of rain,
snow or any other foreign material that may plug the vent
or vent line and prevent proper operation of the regulator.
Periodically check the vent opening to be sure it is not
plugged with foreign debris.
Figure 2. Type 627 Operational Schematic
ADJUSTING SCREW
DIAPHRAGM
PUSHER POST
LEVER
ORIFICE
VALVE DISK
STEM
CONTROL SPRING
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
WARNING
4
627 Series
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