Data Sheet
Bulletin 62.3:670
D200027X012
February 2015
www.fisherregulators.com
670 Series Panel-Mounted Loading Regulators
P1127_670
1-GAUGE PANEL
(671 AND 670 SERIES)
P1128_670G-3
2-GAUGE PANEL
(670 SERIES)
P1130_670GV
2-GAUGE PANEL WITH
CHANGEOVER VALVE
(670 SERIES)
Figure 1. Typical Panel Layouts
Introduction
The Types 670, 671, 674 and 675 panel-mounted
loading regulators (Figures 1, 2, 3 and 6) 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 reneries, power plants and various process
furnaces. The Types 670 and 675 units use the
Type 67CR or 67CFR pressure regulator, the Type 671
unit uses the Type 912 pressure regulator and the
Type 674 unit uses the Type 1301F pressure regulator.
Three basic panels are available within the product
line as shown in Figures 1 and 6, each having one
pressure regulator connected to one or two gauges
or two gauges and a changeover valve. A single
gauge typically shows loading pressure to the control
valve. With two gauges, one gauge shows the loading
pressure and the other gauge can be connected to
show downstream control pressure or any other
pressure up to 300 psig / 20.7 bar. Manual backup
of pneumatic controllers can be handled with those
670 Series units having a changeover valve. With it
the operator selects either the automatic controller
output (displayed on one gauge) or the manual
loader output (displayed on the other gauge and
adjusted by the handwheel) as the signal to the
control valve actuator.