Types 1098-EGR and 1098H-EGR
12
Table 6.
Auxiliary Pilot Selection (Fast Stroke Dual Pilot)
Table 7.
Working Monitor Performance
2. To enable intermediate pressure adjustment with
the working monitor regulator, slowly open the
hand valve in the intermediate pressure control line.
3. To enable downstream pressure adjustment with
the second-stage working regulator, slowly open
the hand valve in the control line to this regulator.
4. Adjust the setting of the monitoring pilot to
establish the desired emergency downstream
pressure, which is to be maintained in the event
of open failure of the second-stage working
regulator. The emergency downstream pressure
should exceed the desired downstream pressure
by at least the amount listed in Table 7. The steps
followed to set the monitoring pilot may vary with
each piping situation; however, the basic method
remains the same. The following sub steps a
and b may be used as examples for setting the
monitoring pilot:
a. Increase the outlet pressure setting of the
second-stage working regulator until the
monitoring pilot takes control of the downstream
pressure. Adjust the monitoring pilot setting
until the desired emergency downstream
pressure is achieved. Then, readjust the second-
stage working regulator to establish the desired
downstream pressure.
b. Install special piping (not shown in
Figure 7) so that the monitoring pilot senses
the intermediate pressure. The intermediate
pressure then appears to the monitoring pilot as
if it was increased downstream pressure,
and the monitoring pilot controls and reduces
the intermediate pressure. Adjust the monitoring
pilot setting until the desired emergency
downstream pressure is achieved at the
intermediate pressure stage. Then slowly
close the special piping, and open up the
monitoring downstream control line for
normal service.
5. Slowly open the downstream block valve.
6. Slowly close the bypass valve, if any.
SIzE
CONSTRuCTION
ORIFICE
SPRINg RANgE
SPRINg
NuMBER
SPRINg
COlOR
MINIMuM PRESSuRE
AT wHICH AuxIlIARy
PIlOT CAN BE SET
Inches
mm
psi
bar
3/4
NPT
Type Y600AM
1/4
6,4
4 to 8-inches w.c.
10 to 20 mbar
1B653827052
Red
1-inch w.c. / 2 mbar
Under working
pilot setpoint
7 to 16-inches w.c.
17 to 40 mbar
1B653927022
Unpainted
15-inches w.c. to 1.2 psi 37 mbar to 0,08 bar
1B537027052
Yellow
1.2 to 2.5
0,08 to 0,17
1B537127022
Green
6-inches w.c. / 14 mbar
Under working
pilot setpoint
2.5 to 4.5
0,17 to 0,31
1B537227022
Light Blue
4.5 to 7
0,31 to 0,48
1B537327052
Black
Type 627M
1/2
13
5 to 10
0,34 to 0,69
10B3076X012
Yellow
8-inches w.c. / 21 mbar
Under working
pilot setpoint
MONITORINg PIlOT INFORMATION
MINIMuM PRESSuRE AT wHICH
wORKINg MONITOR REgulATOR
CAN BE SET
Construction
Spring Range
Spring Part Number
psig
bar
Type 161AYW pilot and 150 psig /
10,3 bar maximum allowable
pilot inlet pressure
3 to 12-inches w.c.
11 to 25-inches w.c.
7 to 30 mbar
27 to 62 mbar
1B653927022
1B537027052
3-inches w.c. / 7 mbar over
normal distribution pressure
25-inches w.c. to 2.5 psi
2.5 to 4.5 psi
4.5 to 7 psi
62 mbar to 0,17 bar
0,17 to 0,31
0,31 to 0,4
1B537127022
1B537227022
1B537327052
14-inches w.c. / 34 mbar over
normal distribution pressure
Type 627-109 pilot and 150 psig /
10,3 bar maximum allowable pilot
inlet pressure for cast iron body
or 750 psig / 51,7 bar maximum
allowable pilot inlet pressure for
malleable iron or steel body
5 to 20
15 to 40
35 to 80
0,34 to 1,4
1,0 to 2,8
2,4 to 5,5
10B3076X012
10B3077X012
10B3078X012
3.0 psig / 0,21 bar over
normal distribution pressure
70 to 150
130 to 200
4,8 to 10,3
9,0 to 13,8
10B3079X012
5.0 psig / 0,34 bar over
normal distribution pressure
