GIM1329-005
3
Model 122 Regulators Installation and Maintenance Instructions
Pressure Ranges and Springs
Standard Regulator
Size
Outlet
Pressure Range
Spring Color
Spring
Part Number
Maximum
Inlet Pressure
Nominal
Diaphragm Size
1" and 1¼"
Model 122-8
1½" w.c. to 3½" w.c.
1½" w.c. to 12" w.c.
3½" w.c. to 6½" w.c
1
5" w.c. to 8½" w.c.
1
6" w.c. to 14" w.c.
1
12" w.c. to 28" w.c.
1
1" psi to 2 psi
Blue-Black
Black
Green-Black
Black
Red-Black
Blue-Black
Green-Black
Green
Orange
143-82-021-01 (main spring)
121-41-021-00 (counterspring)
143-82-021-02 (main spring)
121-41-021-00 (counterspring)
143-82-021-00
143-82-021-01
143-82-021-02
143-16-021-05
143-16-021-06
15 psi
8"
½", 2" and 2½"
Model 122-12
1½" w.c. to 3½" w.c.
1½" w.c. to 12" w.c.
3½" w.c. to 6½" w.c.
2
5" w.c. to 8½" w.c.
2
6" w.c. to 14" w.c.
2
12" w.c. to 28" w.c.
2
1" psi to 2 psi
½" psi to 2 psi
Red
Red-Black
Maroon
Red-Black
Red
Blue
Green
Orange
Black
Cadmium
143-16-021-03 (main spring)
121-10-021-50 (counterspring)
121-42-021-00 (main spring)
121-10-021-50 (counterspring)
143-16-021-03
143-16-021-04
143-16-021-05
143-16-021-06
143-16-021-07
143-16-021-08
15 psi
12"
1
2
These Springs are also used on Model 122 Differential Regulators (see below).
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Atmospheric Regulator or Zero Governor
Size
Outlet
Pressure Range
Spring Part Number and Color
Maximum
Inlet Pressure
Nominal
Diaphragm Size
1" and 1¼"
Model 122-8
1" w.c vacuum (-1" w.c.) to + 1½" w.c.
143-82-021-00
121-41-021-00
Red-Black (main spring)
Black (counter spring)
15 psi
8"
½", 2" and 2½"
Model 122-12
1" w.c vacuum (-1" w.c.) to + 1½" w.c.
143-82-021-00
121-10-021-50
Red-Black (main spring)
Red-Black (counter spring)
15 psi
12"
Differential Regulator
Use STANDARD REGULATOR springs. Outer Pressure
Range, Spring Color and Spring Part Number are the same.
Use
1
springs for 1" and 1¼" Model 122-8 Differential Regulators
and
2
springs for 1½", 2” and 2½" Model 122-12 Differential
Regulators. For all sizes (
¾
" through 2½") the Maximum
Diaphragm Pressure Differential is 1 psi, the Maximum Pressure
for the Body is 15 psi and the Maximum Pressure for the
Diaphragm Case is 5 psi.
Back Pressure Regulator or Relief Valve
Size
Relief or Back
Pressure Range
Spring Color
Part Number
Maximum Body
Inlet Pressure
Nominal
Diaphragm Size
1" and 1¼"
Model 122-8
3" w.c. to 5½" w.c.
5" w.c. to 7½" w.c
6" w.c. to 13" w.c.
10" w.c. to 15" w.c.
12" w.c. to 25" w.c.
18" w.c. to 2 psi
Red-Black
Blue-Black
Green-Black
Blue
Green
Orange
143-82-021-00
143-82-021-01
143-82-021-02
143-16-021-04
143-16-021-05
143-16-021-06
10 psi*
8"
½", 2" and 2½"
Model 122-12
3" w.c. to 5 ½" w.c.
5" w.c. to 7" w.c
6" w.c. to 12" w.c.
12" w.c. to 25" w.c.
20" w.c. to 1¾ psi
Red
Blue
Green
Orange
Black
143-16-021-03
143-16-021-04
143-16-021-05
143-16-021-06
143-16-021-07
10 psi*
12"
*These pressures apply only to External Control Models (refer to Pages 5, 6, 7 or 9). For
Internal Control Models
the Maximum INLET Pressure is
SET-POINT plus 2 psi
.
Typical Installation
GIM1329-005
Remove Vent Line (If Required)
Top Cap
Adjustment
Outlet
Bypass (If Required)
Vent Cap
1
Inlet
Model 122 with Internal Control
1
Screened VENT CAP (Model 137) with screen-facing downwards is recommended to minimize
the possibility of water or other foreign matter entering regulator vent.
Remove Vent Line (If Required)
Top Cap
Adjustment
Outlet
Bypass (If Required)
Vent Cap
1
Inlet
Model 122 with Internal Control
External Control Line
