Data Sheet

Bulletin 62.3:670
2
Available Congurations
See Table 1
End Connections
Inlet: 1/4 NPT internal
Outlet: Types 670 and 675—1/4 NPT internal;
Type 671—3/8 NPT internal;
Type 674—1/4 NPT internal
Maximum Allowable Inlet Pressure
Without Changeover Valve: 250 psig / 17.2 bar
With Changeover Valve: 50 psig / 3.4 bar
Maximum Outlet Pressure
See Table 1
Maximum Emergency Outlet Pressure
See Table 1
Outlet Pressure Ranges
Types 670 and 675
(1)
: 3 to 18 psig / 0.21 to 1.2 bar
5 to 30 psig / 0.34 to 2.1 bar; 30 to 50 psig / 2.1 to
3.4 bar; and 35 to 80 psig / 2.4 to 5.5 bar except
35 to 50 psig / 2.4 to 3.4 bar with change over valve
Type 671: 0 to 1 psig / 0 to 0.07 bar; 0 to 5 psig /
0 to 0.34 bar
Type 674: 10 to 75 psig / 0.69 to 5.2 bar;
50 to 150 psig / 3.4 to 10.3 bar;
100 to 225 psig / 6.9 to 15.5 bar
Pressure Registration
Internal
Construction Materials
Panel Tubing: Copper, PVC-coated copper,
aluminum or 316 (316 Stainless steel)
Regulator Body
Types 670 and 675: Die-cast aluminum
Type 671: Die-cast zinc
Type 674: Brass
Regulator Spring Case
Types 670 and 675: Die-cast zinc/Stainless steel
Type 671: Die-cast zinc
Type 674: Forged brass or steel
Panel
Types 670, 670F and 671: Zinc
Types 670FG, 670G, 670FGV and 670GV: Steel
Handwheel: Die-cast aluminum
1. These pressure ranges are recommended, but all springs used in the Type 67CR or 67CFR regulators can be adjusted down to 0 psig / 0 bar.
2. Dened in ISA Standard S51.1-1979.
Specications
This section lists the specications for the 670 Series panel-mounted loading regulators. Factory specications
are stamped on the nameplate fastened on the regulator at the factory.
Construction Materials (continued)
Other Regulator Parts
Diaphragm: Nitrile (NBR)
Valve Disk: Nitrile (NBR)
Diaphragm Plate: Plated steel
Spring: Plated steel
Filter Cartridge (Type 67CFR Regulator Only):
Cellulose (standard) or Stainless steel or Brass
Temperature Capabilities
-20 to 180°F / -29 to 82°C
Pressure Gauges
Connection: 1/8 NPT external tting on back
of case
Ranges: Standard ranges shown in Table 2 with
other ranges available upon request
Face Colors: White with black numerals
Case Color: Black
Gauge Identication: White engraving on black
laminated plastic plate below gauge indicates units
and function. Up to 16 characters per line, 3 lines,
are available.
Regulator Port Diameters
Types 670 and 675: 0.125 in. / 3.2 mm
Type 671: 0.073 in. / 1.9 mm (standard);
0.094 in. / 2.4 mm (optional)
Type 674: 0.078 in. / 2.0 mm
Operating Inuences
(2)
670 Series: As shown in Figure 4, output pressure
changes less than 5 psig / 0.34 bar when the input
pressure changes between 20 to 140 psig / 1.4 to
9.7 bar
Type 671: As shown in Figure 5, output pressure
changes less than 1 in. w.c. / 2 mbar when the
input pressure changes between 20 to 140 psig /
1.4 and 9.7 bar
Regulator Flow Capacity
See appropriate pressure regulator bulletin
Internal Relief for Pressure Regulators
Adequate for relieving only minor build-up
situations. Refer to the appropriate pressure
regulator bulletin to determine if external relief
is required.