Available Configurations

See table 1

End Connections

Inlet: 1/4-inch 18 NPT female
Outlet: Types 670, 672, and 675—1/4-inch 18 NPT female; Type 671—3/8-inch 18 NPT female; Type 674—1/4-inch 18 NPT female

Maximum Allowable Inlet Pressure

Without Changeover Valve: 250 psig (17 bar)
With Changeover Valve: 50 psig (3.4 bar)

Maximum Outlet Pressure and Emergency Outlet Pressure

See table 1

Outlet Pressure Ranges

Types 670 and 675(1): ■ 0.2 to 1.2 bar (3 to 18 psig); ■  0.3 to 2.1 bar (5 to 30 psig); ■  2.1 to 3.4 bar (30 to 50 psig); and ■  2.4 to 5.5 bar (35 to 80 psig) except 2.4 to 3.4 bar (35 to 50 psig) with changeover valve
Type 671: ■  0 to 0.07 bar (0 to 1 psig); ■  0 to 0.34 bar (0 to 5 psig)
Type 674: ■  0.7 to 5.2 bar (10 to 75 psig); ■  3.4 to 10.3 bar (50 to 150 psig); ■  6.9 to 15.5 bar (100 to 225 psig)

Pressure Registration

Internal

Construction Materials

Panel Tubing: ■ Copper, ■ PVC-coated copper, ■ aluminum, or ■ S31600 (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
Other Regulator Parts:
Diaphragm: Nitrile
Valve Disk: Nitrile
Diaphragm Plate: Plated steel
Spring: Plated steel
Filter Cartridge (Type 67AFR Regulator Only): Cellulose (standard), stainless steel, or brass

Material Temperature Capabilities

-29 to 71°C (-20 to 160°F)

Pressure Gauges

Connection: 1/8-inch NPT male fitting 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 Identification: 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: 3.2 mm (0.125 inch)
Type 671: Standard--1.8 mm (0.073 inch);
Optional--2.4 mm (0.094 inch)
Type 674: 2 mm (0.078 inch);

Operating Influences(2)

670 Series: As shown in figure 4, output pressure changes less than 0.34 bar (5 psig) when the input pressure changes between 1.4 and 9.7 bar (20 and 140 psig)
Type 671: As shown in figure 5, output pressure changes less than 2.5 mbar (1 inch w.c.) when the input pressure changes between 1/4 amd 0/7 bar (20 and 140 psig)

Regulator Flow Capacity

See appropriate pressure regulator bulletin

Internal Relief for Pressure Regulators

Adequate for relieving only minor buildup situations. Refer to the appropriate pressure regulator bulletin to determine if external relief is required.

• Control Flexibility—With a changeover valve, the operator can deliver pressure to the control valve from the manual loader, a controller, or bypass the panel completely.
• Gauge Identification—Big, clear, white-on-black labels (see figure 1) show gauge function and units at a glance.
• Convenient Fingertip Control—Turn the panel-mounted handwheel clockwise to increase or counter-clockwise to decrease pressure to the control valve while watching the high visibility black-on-white gauges.
• Easy Connections—Unit comes with all the hardware necessary to connect the loading pressure gauge to the pressure regulator.
• Versatility—Pressure regulators are suitable for a variety of gaseous fluids including natural gas, propane, and air.
• Compact Size—The slim profiles of the regulators are ideal for installations where space behind the panel is limited.

Note: Fisher does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and maintenance of any Fisher product remains solely with the purchaser and end-user.

Dimensions for installation clearances are shown in figures 6 and 7 and table 3.