17
8
24
5
10
13
14
29
12
11
9
1
15
16
6
7
2
4
3
20
3
19
2
7
6
14
15
1
9
11
12
18
29
4
25
8
5
10
13
16
Startup
The regulator is factory set at approximately the midpoint of the
spring range or the pressure requested, so an initial adjustment
may be required to give the desired results. With proper installation
completed and relief valves properly adjusted, slowly open the
upstream and downstream shutoff valves.
Adjustment
To change the outlet pressure, remove closing cap or loosen the
locknut and turn the adjusting screw clockwise to increase outlet
pressure or counterclockwise to decrease pressure. Monitor the
outlet pressure with a test gauge during the adjustment. Replace
closing cap or tighten the locknut to maintain the desired setting.
Taking Out of Service (Shutdown)
!
WARNING
To avoid personal injury resulting from sudden
release of pressure, isolate the regulator from all
pressure before attempting disassembly.
Parts List
Key Description
1
Regulator Body
2
Spring Case
3
Closing Cap
4
Adjusting Screw
5
Regulator Spring
6
Relief Valve Spring
7
Spring Seat
8 Pin
9
Relief Valve Seat
10
Diaphragm Plate
11
Disk Holder
12
Fulcrum Rod
13
Machine Screw
Key Description
14
Machine Screw
15 Diaphragm
16
Vent Screen
17* Closing Cap Gasket
18
Closing Spring, for 912N Series
with handwheel only
19
Spacer Ring, for 912N Series
with handwheel only
20
Lockwheel, for 912N Series
with handwheel only
25
Spring Seat, for 912N Series
with handwheel only
29* Disk
*Recommended spare part
1/8 NPT
1/8 NPT
FOR TYPE 912H
ONLY (LOCATE
PER T10895)
Figure 1.
912N Series Pressure Regulator Assembly
Figure 2.
912N Series with Handwheel Construction Assembly
BB7822
BC2347
912N Series
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Technologies, Inc. All rights reserved. 04/19.
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