2" and 2, Model 121, Back pressure – Grain Systems PNEG-526 User Manual
Page 173: 12 (back pressure)
121-8 (Standard)
1" NPT Vent
connection
1/4
" NPT Control
line connection
1" NPT Vent
connection
1/4
" NPT Vent
connection
121-12 (Standard)
Standard, Differential, Atmospheric or Zero Governors
Fig. 1
ADJUSTMENT 3
and VENT CONNECTION
21b for Differential Regulators,
Atmospheric Regulators
and Zero Governors
8
3
Back Pressure
121-8 HP (High Pressure)
1" NPT Vent
connection
1
/
4
" NPT Control
line connection
1
1
/
2
", 2" and 2
1
/
2
" Model 121
121-8 HP (High Pressure)
(Back Pressure)
29a
29
1" NPT Vent
connection
1
/
4
" NPT Control
line connection
25
24
26
27
PIPE SIZES (inlet x outlet)
1
1
/
2
" x 1
1
/
2
"
1
1
/
2
" x 2"
2" x 2"
Screwed, NPT
2
1
/
2
" x 2
1
/
2
"
2" x 2" Flanged ANSI 125 lb. FF
}
1
2
3
9
45
21
11
22
1" NPT Vent
connection
" NPT Control
line connection
23
24
25
26
a
b
c
d
f
h
27
29
29a
21a
30
33
34
35
14a 14b 15 16a 16b 13 19a 19 18 38 37 32
12
13
a
b
c
d
14
121-12 (Back Pressure)
1"NPT Vent
connection
1
/
4
" NPT Control
line connection
25
26
27
21
22
23
24
121-8 (Back Pressure)
29a
29
1
1
/
2
", 2" and 2
1
/
2
" Model 121