Description; Outlet (Control) Pressure Ranges; Maximum Inlet And Outlet Pressures; Safety Pilot Outlet (Control) Pressure Ranges - Fisher 92S Instruction Manual

OUTLET PRESSURE RANgES
PiLOT TYPE
psig
2 to 6
6492L 5 to 15
13 to 25
10 to 30
6492H 25 to 75
70 to 150
15 to 100
6492HT
80 to 250
MAxIMuM ALLOWABLe INLeT PReSSuRe
CONSTRuCTION
psig
With Type 6492HT pilot
With Type 6492H pilot
250
With Type 6492L pilot
TYPE
psig
10 to 30
6492HM 25 to 75
70 to 150
15 to 100
6492HTM
80 to 250

Description

The Type 92S pressure-reducing regulator for steam
service includes either a Type 6492H, 6492HT, or
6492L pilot (Figure 1). Both pilots have a friction-
reducing bellows seal on the stem, and offer pressure-
setting adjustment plus sensitivity to downstream
pressure changes.
These pilots are available in either a standard version
with a drilled spring case vent, or an optional version
with a tapped spring case vent and a sealed adjusting
screw for pressure-loading or on-off service. A 67 or
1301 Series regulator or 670 Series panel-mounted
regulator may be used to load the pilot of a version
for pressure-loading service, while a solenoid valve
may be used on the pilot of a version for on-off
service. A Type 6492HM or 6492HTM safety override
pilot is available for the Type 92S. The Type 6492H
or 6492HT pilot is used in a series installation with
the Type 6492HM or 6492HTM safety override
pilot installed on the upstream control valve. The
Type 6492HM or 6492HTM safety override pilot
Table 2. Outlet (Control) Pressure Ranges
PART NuMBeR
bar
0.14 to 0.41 1E395627022
0.34 to 1.0 1D7455T0012
0.90 to 1.7 1E395727192
0.69 to 2.1 1E395627022
1.7 to 5.2 1D7455T0012
4.8 to 10.3 1E395727192
1.0 to 6.9 14B9943X012
5.5 to 17.2 14B9942X022
Table 3. Maximum Inlet and Outlet Pressures
Steel and
Cast Iron
Stainless Steel
bar psig
- - - -
300
17.2
Table 4. Safety Pilot Outlet (Control) Pressure Ranges
SPRiNg RANgE
SPRING COLOR
bar
0.69 to 2.1
1.7 to 5.2
4.8 to 10.3
1.0 to 6.9
Unpainted
5.5 to 17.2
SPRING WIRe DIAMeTeR
COLOR CODe
Yellow
Green
Red
Yellow
Green
Red
Unpainted
mAximUm
OPERATiNg OUTLET
PRESSURE
bar psig bar
250 17.2
20.7
150 10.3
25 1.7
PART NuMBeR
Yellow 1E395627022
Green 1D7455T0012
Red 1E395727192
14B9943X012
14B9942X022
senses pressure downstream of the second valve, and
prevents pressure from rising above safe operating
pressure in the event the downstream valve fails. This
system is approved by ASME B31.1-1989, 122.14.2.A,
and can replace an ASME safety valve when vent
piping is not practical and upstream steam pressure
does not exceed 400 psig / 27.6 bar. Local codes and
standards may require approval by an appropriate
authority prior to installation.
The Type 92S safety override system
does not provide positive shutoff in
dead end service. it is intended for
large distribution systems where steam
leakage will condense before steam
pressure builds up. Downstream piping
and components must be rated for
maximum upstream steam pressure for
dead end service. Failure to do so could
cause personal injury or death.
Type 92S
SPRiNg FREE LENgTH
inch mm inch
0.207 5.26 2.50
0.234 5.94 2.62
0.283 7.19 2.44
0.207 5.26 2.50
0.234 5.94 2.62
0.283 7.19 2.44
0.282 7.16 2.50
0.375 9.53 2.50
MAxIMuM eMeRGeNCy OuTLeT PReSSuRe
Steel or Stainless Steel
Cast Iron Main Valve and
main Valve and
Pilot Body
300 psig / 20.7 bar or main
- - - - valve body rating limit,
whichever is lower
250 psig / 17.2 bar or main 300 psig / 20.7 bar or main
valve body rating limit, valve body rating limit,
whichever is lower whichever is lower
100 psig / 6.9 bar 100 psig / 6.9 bar
MINIMuM PReSSuRe AT WHICH
MONITORING PILOT CAN Be SeT
5 psig / 0.34 bar over normal distribution pressure
10 psig / 0.69 bar over normal distribution pressure
WARNiNg
!
mm
63.5
66.5
62.0
63.5
66.5
62.0
63.5
63.5
Pilot Body
3