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If outlet pressure adjustment is necessary, monitor
the outlet pressure with a gauge while performing the
following procedures:
1. For units without a handwheel, unscrew the closing
cap (key 3) and insert a screw driver blade into the
adjusting screw (key 4).
2. Slowly turn the adjusting screw or handwheel
clockwise to increase or counterclockwise to
decrease the output pressure setting.
3. With the output pressure adjusted to the desired
value, replace the closing cap on units without
a handwheel.
Shutdown
Close the nearest upstream shut-off valve, then close the
nearest downstream shut-off valve, and vent pressure from
the outlet of the regulator.
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 or the requirements of local, state, and
federal rules and regulations.
WaRNiNg
!
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without first isolating the
regulator from system pressure and relieving
all internal pressure from the regulator.
This procedure is to be performed if changing the control
spring for one of a different range, or for inspecting, cleaning,
or replacing any other parts. Key numbers are referenced
in Figures 2 and 3.
If sufficient clearance exists, the regulator body
(key 1) can remain in the line during spring
replacement or other maintenance procedures.
Control Spring Replacement
Refer to Figure 2 on units without the handwheel, unscrew
the closing cap (key 3) and turn the adjusting screw out of
the spring case. Lift out the control spring (key 5).
Refer to Figure 3 on units with a handwheel (key 4), turn the
handwheel counterclockwise until the tension is relieved from
the control spring (key 5). Unscrew the nut at the base of the
handwheel and lift the handwheel off the spring case (key 2).
Lift out the adjusting screw (key 4) and the control spring.
Note
Replace the control spring and complete the assembly
by replacing the adjusting screw and the closing cap or
handwheel. Adjust the spring tension as described in the
Startup section.
Diaphragm and Relief Valve Replacement
Remove cap screws (key 14) and separate the spring case
from the valve body. Remove the control spring (key 5) and the
diaphragm (key 15) along with the diaphragm head (key 10),
the relief valve seat (key 9) and the relief valve spring (key 6).
Separate these parts by removing the pin (key 8) and the spring
seat (key 7).
To reassemble the regulator, first assemble the relief valve
spring assembly, then replace the relief valve spring assembly,
the diaphragm, the diaphragm head, and fit the spring case
to the body. Install and tighten cap screws (key 14) in a
crisscross manner. Adjust the control spring tension as
described in the Startup section.
Parts Ordering
When corresponding with the local Sales Office about this
regulator, include the type number, date of manufacture, and
all other pertinent information from the labels. Specify the
eleven-character part number when ordering new parts from
the following parts list.
Parts list
Key
Description
1
Body, Zinc
1/4 x 1/4 NPT
0.073-inch (1,9 mm) port diameter
1/4 x 3/8 NPT
0.073-inch (1,9 mm) port diameter
1/4 x 1/4 NPT
0.094-inch (2,4 mm) port diameter
1/4 x 3/8 NPT
0.094-inch (2,4 mm) port diameter
2
Spring Case
3
Closing Cap
912N Series with handwheel, Brass
All others, Plastic
4
Adjusting Screw
912N Series with handwheel, Zinc/Steel
All others, Plastic
5
Regulator Spring, Steel
6
Relief Valve Spring, Steel
7
Spring Seat, Steel
8
Pin, 302 Stainless steel
9
Relief Valve Seat, Zinc pusher (relieve valve post)
10
Diaphragm Plate, Zinc-plated Steel
11
Disc Holder
12
Fulcrum Rod, 302 Stainless steel
13
Machine Screw, Steel (2 required)
14
Machine Screw, Steel (6 required)
15
Diaphragm, Nitrile (NBR)
Spring Range: 3 to 24-inches w.c.
(7 to 60 mbar)
Spring Range: 0.5 to 5 psi
(0,03 to 0,34 bar)
16
Vent Screen, 304 Stainless steel
912N Series
Part Number
3D377144042
3B782444042
T4000544042
3B892744042
3E294444042
1C234414012
T13269T0012
14B7140X022
T1027706992
See Table 1
1B784827012
1B783425072
1B783535032
2B783044012
1B783824132
GE19397X012
0U091435032
T12748T0012
1V4131X0012
1B7837T0022
1B783702012
0W086343062
3
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