Principle Of Operation - Emerson Fisher 299HR Manual

BODY SIZE,
IN. / DN
Cast Iron (For Types 299H and 299HR only)
1-1/4
1-1/2
2 / 50 NPT and CL125 FF
1. This flange is available with a face-to-face dimension of 7.5 in. / 190 mm or 10 in. / 254 mm.
OUTLET (CONTROL)
PRESSURE RANGE
In. w.c. mbar
(1) (1)
3.5 to 6 9 to 15
(1) (1)
5 to 9 12 to 22
(1) (1)
7 to 20 17 to 50
16 to 40 (1) 40 to 99 (1)
1 to 3.25 psig 69 mbar to 0.22 bar
2.75 to 6 psig 0.19 to 0.41 bar
5 to 16 psig 0.34 to 1.1 bar
14 to 35 psig 0.97 to 2.4 bar
30 to 60 psig 2.1 to 4.1 bar
1. Use a pilot supply regulator if actual inlet pressure varies more than ±20 psi / ±1.4 bar and the published accuracy is required.

Principle of Operation

WARNING
!
Since a pilot-operated regulator is
constructed of both a pilot and a main
valve, do not exceed the maximum inlet
pressure shown on the nameplate.
Letter keys in this section refer to Figure 2 unless
otherwise noted. Fast response and accuracy are
made possible by the amplifying effect of the pilot
and by the two-path control system. The function of
the pilot is to sense change in the controlled pressure
and amplify it into a larger change in the loading
pressure. Any changes in outlet pressure act quickly
on both the actuator diaphragm and the loading pilot,
thus providing the precise pressure control that is
characteristic of a two-path control system.
Upstream or inlet pressure is utilized as the operating
medium, which is reduced through pilot operation to
load the main diaphragm chamber. Tubing connects
the inlet pressure to the pilot. Downstream or outlet
pressure registers underneath the main diaphragm (E)
and on top of pilot diaphragm (F). There are three
different versions of pressure registration for the
299H Series.
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Table 1. Body Sizes and End Connection Styles
BODY MATERIAL AND END CONNECTION STYLE
NPT
NPT
NPT, CL125 FF and CL250 RF flanged
(1)
flanged
Table 2. Outlet Pressure Ranges
TYPE
299HR,
299HV
299H Part Number
and
299HVR
X X T13707T0012
X X T13589T0012
X X 1N3112X0012
X X 1B413727222
X X T13593T0012
X X T13671T0012
X X T13600T0012
X - - - - 19B0432X012
X - - - - 19B0432X022
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Ductile Iron Steel (For Types 299H and 299HR only)
- - - -
NPT
and PN 10/16 flanged
PILOT CONTROL SPRING
Free Length
Color
In.
Black 1.86
Yellow 2.05
Unpainted 2.18
Purple 2.12
Light blue 2.12
Orange 2.40
Red 2.10
Zinc 2.15
Green 2.75
Internal registration—Outlet pressure is registered
through the throat (J) to the main diaphragm chamber
and then through a small port (G) to the top of the
pilot diaphragm.
External registration—The throat (J) is blocked and a
downstream control line is connected to the pilot upper
diaphragm chamber or the actuator lower diaphragm
chamber. A small port (G) connects the two chambers.
Dual registration—The lower main diaphragm chamber
registers outlet pressure through the throat (J) and the
upper pilot diaphragm chamber registers downstream
pressure by using a downstream control line. The port (G)
between the chambers is blocked.
Type 299H
In operation, assume the outlet pressure is less than
the setting of the pilot control spring (A). The top side
of pilot diaphragm assembly (F) will have a lower
pressure than the setting of the control spring (A).
The control spring (A) forces the diaphragm assembly
upward, opening the pilot orifice (C). Additional loading
pressure is supplied from the pilot orifice to the top
side of the main diaphragm (E).
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- - - -
NPT
NPT and CL150 RF flanged
Wire Diameter
mm In. mm
47.2 0.055 1.40
52.1 0.051 1.30
55.4 0.075 1.90
53.8 0.092 2.34
53.8 0.105 2.67
61.0 0.120 3.05
53.3 0.142 3.61
54.6 0.207 5.26
69.8 0.225 5.71
3