Principle Of Operation - Emerson Fisher 1301 Series Manual

DISK HOLDER
M1015
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
OUTLET PRESSURE
(1)
RANGES
TYPE
psig bar
10 to 75 0.69 to 5.2
1301F 50 to 150 3.4 to 10.3
100 to 225 6.9 to 15.5
1301G 200 to 500 13.8 to 34.5
1. All springs can be backed off to 0 psig / 0 bar.

Principle of Operation

The 1301 Series regulators are direct-operated.
Downstream pressure is registered internally through
the body to the underside of the diaphragm. When
downstream pressure is at or above set pressure,
the disk is held against the orifice and there is no
flow through the regulator. When demand increases,
downstream pressure decreases slightly allowing the
CONTROL SPRING
SPARE DISK
BOTTOM CAP
Figure 2. Type 1301F Operational Schematic
Table 1. Outlet Pressure Ranges
SPRING COLOR
Blue
Silver
Red
Silver
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DIAPHRAGM
VALVE DISK
VALVE SPRING
SPRING WIRE DIAMETER
SPRING PART NUMBER
In.
1D387227022 0.200
1B788527022 0.225
1D465127142 0.243
1K156027142 0.331
regulator spring to extend, moving the yoke and disk
assembly down and away from the orifice. This allows
flow through the body to the downstream system. As
the downstream pressure reaches its setpoint, it starts
to overcome the spring force, which is sensed by the
diaphragm, moving the yoke and disk assembly up near
its orifice, restricting flow across the regulator.
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SPRING FREE LENGTH
mm In. mm
5.08
5.72 1.69 42.9
6.17
8.41 0.88 22.4
3