reduce high gas supply pressures to practical
use levels. Since capacities will vary with the pressure drop
across the regulator (see Table D), due care must be exercised
in properly sizing both the regulator and downstream piping.
Outlet pressure of regulators (except where noted) may be varied
through use of interchangeable compression springs within the
groups indicated in selection Table B. Compression springs are
identifi ed by either color or part number. Products ending in
"-SS" contain an integrated overpressure slam-shut device.
ody Sizes and End Connections:
Orifi ce Diameter:
See Table C
Maximum Operating Inlet Pressure:
See Table C
Maximum Outlet (Casing) Pressure:
Maximum Operating Outlet Pressure to Avoid Internal
Parts Damage - The Outlet Pressure Rating:
3 psig above outlet pressure setting
-20° to 150°F
Slam-Shut Pressure Registration:
When selecting a regulator, specify its complete designation in-
cluding pipe size code and spring designation or outlet pressure
Select a regulator for 2000 scfh of 0.6 specifi c
gravity natural gas from 5 psig supply pressure to 26"w.c. outlet
Entering Table D, the required spring range is 14 to
30"w.c. Further, the regulator with the appropriate capacity is
determined to be the 7337A-3-GNS.
Table A. Specifi c Gravity Correction Factor
The 7337A-3 Regulator comes equipped with a non-adjustable
internal limited capacity relief valve feature. This internal relief
valve is intended to minimize overpressure that could occur
due to seat leakage. If the downstream pressure exceeds the
regulator setting by 7 to 56"w.c. depending on the main spring
used (see Table B), the relief valve opens and excess gas is
vented through the vent in the upper spring case.
If the specifi c gravity of the gas is other than 0.6, divide desired
fl ow by gravity factor to get equivalent fl ow of natural gas; then
select regulator from Table D.
Multiply a given size regulators natural gas capacity by gravity
factor to get regulator capacity with diff erent gas.
Product Overview | High Pressure Gas Regulator