Data Sheet

Bulletin 71.1:67C
6
Figure 3. 670 Series Typical Panel Layouts
1-GAUGE PANEL 2-GAUGE PANEL 2-GAUGE PANEL WITH
CHANGEOVER VALVE
W3123 W3122_1
W0554
Figure 4. 67C Series Vent and Drain Valve Positions
250 PSI
MAX INLET
DRAIN VALVE POSITIONS
T40573_2B
GAUGE
DRAIN VALVE
POSITION 2
DRAIN VALVE
POSITION 1
(STANDARD)
DRAIN VALVE
POSITION 4
DRAIN VALVE
POSITION 3
FLANGE
SCREW
INLET
OUTLET
B2699_C
VENT POSITION
FLANGE SCREW
INLET
OUTLET
GAUGE
VENT POSITION 2
VENT POSITION 3
VENT POSITION 1
(STANDARD)
VENT POSITION 4
To determine the equivalent capacities for other gases,
multiply the table capacity by the following appropriate
conversionfactor:1.29for0.6specicgravitynaturalgas,
0.810 for propane, 0.707 for butane, or 1.018 for nitrogen.
Forgasesofotherspecicgravities,dividethetable
capacitiesbythesquarerootoftheappropriatespecic
gravity.Tondwide-openowcapacitiesforreliefsizingat
any inlet pressure, perform one of the following procedures.
Then, if necessary, convert using the factors provided above.
For critical pressure drops (absolute outlet pressure equal
to or less than one-half of absolute inlet pressure), use the
following formula:
Q = (P
1
)(C
g
)
For pressure drops lower than critical (absolute outlet
pressure greater than one-half of absolute inlet pressure),
use the following formula:
Q
C
g
P
1
SIN
=
520
GT
3417
C
1
)
)
P
P
1
DEG
where,
   Q =gasowrate,SCFH
P
1
= absolute inlet pressure, psia (P
1
gauge + 14.7)
C
g
 =gassizingcoefcient
   G =specicgravityofthegas
T = absolute temperature of gas at inlet, °Rankine
C
1
 =owcoefcient(C
g
÷ C
v
)
P = pressure drop across the regulator, psi
Then, if capacity is desired in normal cubic meters per hour
(at 0°C and 1.01325 bar), multiply SCFH by 0.0268.
670 Series Panel-Mounted Loading
Regulators (Figure 3)
The 670 Series panel-mounted loading regulators are
compact, rugged units used primarily for manually loading
pressure-balanced gas regulators and providing manual
control for diaphragm actuator control valves. Applications
include remote control of gas pressure to burners in
reneries,powerplants,andvariousprocessfurnaces.