Sensus 121 Series - Pipe Sizes

1
2
9
3
21b
Fig. 1
Adjustment and Vent Connection
21b for Differential Regulators,
Atmospheric Regulators and
Zero Governors
27
37
16b
a
c
a
b
e
11
1a
3a
High
Pressure
Spring
Adjustment
4
5
7a
7b
9
45
21
22
23
25
24
26
29
35
38
32
19
16a
15
14
13
d
b
12
13
h
f
g
d
c
2a
2
21a
1/4"NPT
Control
line
connection
1"
NPT
Vent
connection
6
3/4" – 1" – 1-1/4"
Standard, Differential, Atmospheric or Zero Governors
16b
15
14
13
12
a
b
11
a
c
h
3
1
35
22
23
21
24
25
26
27
29
37
38
32
19
16a
c
d
f
d
1/4" NPT
Control
line
connection
b
13
21a
2
45
1" NPT Vent
connection
9
121-8 – Standard
121-8 HP – High Pressure
Pipe Sizes
(inlet x outlet) Screwed, NPT
3/4" x 1"
3/4" x 1-1/4"
1" x 1"
1" x 1-1/4"
1-1/4" x 1-1/4"
Installation and Maintenance
Model 121 Regulators