Installation | High Pressure Gas Regulators
INSTALLATION
To determine the wide-open flow capacity of a regulator for relief sizing, use the following formulas.
The North American 7337A/B/C-4 Regulator may be installed in any orientation as long as flow through it matches the direction arrow cast on the body. Preferred installation is with the spring case vertical above the body. OVERPRESSURE PROTECTION Like most pressure-reducing regulators, the 7337A/B/C-4 Regulators have outlet pressure ratings that are lower than the inlet pressure ratings. Therefore, a pressure relieving or pressure limiting device is needed if the inlet pressure can exceed the outlet pressure rating, see "Specifications". This regulator does not have an internal relief feature. CAPACITY INFORMATION Table C provides the natural gas regulating capacities of the 7337A/B/C-4 regulators at specific inlet pressures and outlet pressure settings. Flows are in SCFH (60°F and 14.7 psia) of 0.6 specific gravity gas. For specific gravity conversion factors to other gases, refer to the "Selection" section.
(
≤ 1.894 : P 1 P 0
If
√ Q = K P 0 (P 1 -P 0 )
(
>1.894 : P 1 P 0
If
K P 1 2
Q =
P 0 P 1 Q
= outlet pressure, psia = inlet pressure, psia = flow rate, SCFH
K
= regulator constant (see below)
Orifice size ½" ¾"
1"
K
520 1100 1800
Table B. 7337A/B/C-4 Regulator Springs and Maximum Inlet Pressures
Max. Operating Inlet Pressure, psig
Max. Emergency Inlet Pressure, psig
Compression Spring Color
7337A-4-G4 7337A-4-G8 Regulator Designation
Orifice Size, inches
Outlet Pressure Range
Number
3.5-6.5"w.c. (8.7-16 mbar) 6-14"w.c. (15-35 mbar) 12-28"w.c. (30-70 mbar) 1-5 psig (0.07-0.34 bar) 3-15 psig (.21-1.0 bar) 10-35 psig (0.68-2.4 bar) 3.5-6.5"w.c. (8.7-16 mbar) 6-14"w.c. (15-35 mbar) 12-28"w.c. (30-70 mbar) 1-5 psig (0.07-0.34 bar) 3-15 psig (.21-1.0 bar) 10-35 psig (0.68-2.4 bar) 3.5-6.5"w.c. (8.7-16 mbar) 12-28"w.c. (30-70 mbar) 1-5 psig (0.07-0.34 bar) 3-15 psig (.21-1.0 bar) 10-35 psig (0.68-2.4 bar)
Red
R690-5600 R690-5608 R690-5603 R690-5604 R690-5605 R690-5606 R690-5600 R690-5608 R690-5603 R690-5604 R690-5605 R690-5606 R690-5600 R690-5603 R690-5604 R690-5605 R690-5606
½ ½ ½ ½ ½ ½ ¾ ¾ ¾ ¾ ¾ ¾
150 150 150 150 150 150 125 125 125 125 125 125 60 60 60 60
175 175 175 175 175 175 175 175 175 175 175 175 110 110 110 110 110
Green
7337A-4-HG16 7337A-4-HG80
Orange
White Gray Brown
7337A-4-L3 7337A-4-L4 7337B-4-G4 7337B-4-G8
Red
Green
7337B-4-HG16 7337B-4-HG80
Orange
White Gray Brown
7337B-4-L3 7337B-4-L4
7337C-4-G4 7337C-4-HG16 7337C-4-HG80
Red
1 1 1 1 1
Orange
White Gray Brown
7337C-4-L3 7337C-4-L4
60
Bulletin 7337A/B/C-4 Page 3
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