Type 627F
6
Note
Always use a pressure gauge to monitor
pressure when making adjustments.
Shutdown
!
WARNING
To avoid personal injury, property
damage due to explosion, or damage
to regulator or downstream
components during shutdown, release
downstream pressure to prevent
an overpressure condition on the
diaphragm of the regulator.
1. Close the upstream shutoff valves to the pilot and
regulator inlets.
2. Close the downstream shutoff valves to the pilot
sense connection and the regulator outlet.
3. Slowly open the vent valve on the downstream
side of the regulator to vent all pressures.
Maintenance
Due to normal wear, damage from external sources,
or debris in the air or gas line, regulator parts such
as the disk assembly, orifice, and diaphragm must
be inspected periodically and replaced as necessary
to ensure correct performance. The frequency of
inspection and replacement depends upon the severity
of conditions and the requirements of applicable
laws. Normal wear of the orifice and disk assembly
is accelerated with high-pressure drops and with
impurities in the flow stream.
Due to the care Regulator Technologies takes
in meeting all manufacturing requirements (heat
treating, dimensional tolerances, etc.), use only
replacement parts manufactured or furnished by
Fisher
®
. Instructions are given below for replacing the
disk assembly, orifice, diaphragm, and O-rings. These
procedures may also be used for disassembly required
for inspection and replacement of other parts.
Body Area Maintenance Procedures
!
WARNING
Isolate the regulator from all pressure
to avoid personal injury and equipment
damage due to explosion or sudden
release of process pressure. Cautiously
release all pressure from the regulator
before attempting disassembly.
The disk assembly and orifice can be inspected,
removed, and replaced without removing the
regulator body from the line connections. If the
disk assembly and orifice are not damaged, refer to
the Diaphragm and Spring Case Area Maintenance
procedures in this section.
Table 6.
Recommended Torque Values
KEY NUMBER
(1)
DESCRIPTION
FOOT-POUNDS
NEWTON METERS
Type 627F Actuator
2
Orifice
25
34
3
Cap Screw (with aluminum diaphragm casing)
16
22
Cap Screw (with ductile iron or steel diaphragm casing)
25
34
18
Cap Screw Lever
7
9,5
36
Closing Cap
40
54
37
Spring Case Cap Screw (with aluminum or ductile iron diaphragm casing)
7
9,5
Spring Case Cap Screw (with steel diaphragm casing)
35
47
53
Spring Retainer
3
4.1
54
Diaphragm Connector
7
9.5
Type 6351F Pilot
3
Body Plug
6
8.1
12
Machine Screw
3
4.1
1. Refer to Figures 3 and 4 for key number locations.
