Installation Guide
D103055X014
English – October 2013
Type 6492
Introduction
This installation guide provides instructions for installation,
startup and adjustment. To receive a copy of the
instruction manual, contact your local Sales Office or view
a copy at www.fisher.com. For further information refer to:
Type 92S Instruction Manual, D100637X012.
PED Categories
This product may be used as a safety accessory with
pressure equipment in the following Pressure Equipment
Directive categories. It may also be used outside of the
Pressure Equipment Directive using sound engineering
practice (SEP) per table below. For information on the
current PED revision see Bulletin: D103053X012.
PRODUCT SIZE CATEGORIES FLUID TYPE
1/4 NPT SEP 1
Specifications
Maximum Inlet and Outlet Pressures
See Table 2
Outlet Pressure Ranges
See Table 1
Proof Test Pressure
All Pressure Retaining Components have been
proof tested per Directive.
Maximum Temperature Capabilities
Cast Iron: 208°C / 406°F
Steel: 260°C / 500°F
Optional High Temperature Steel and Stainless
Steel Construction: 343°C / 650°F
(1)
Installation
WARNING
!
Only qualified personnel should install
or service a regulator. Regulators
should be installed, operated and
maintained in accordance with
international and applicable codes
and regulations and Emerson Process
Management Regulator Technologies,
Inc. instructions.
Table 1. Outlet (Control) Pressure Ranges
PILOT TYPE
6492L
6492H
6492HT
OUTLET PRESSURE RANGE
bar psig
0.14 to 0.41 2 to 6
0.34 to 1.0 5 to 15
0.90 to 1.7 13 to 25
0.69 to 2.1 10 to 30
1.7 to 5.2 25 to 75
4.8 to 10.3 70 to 150
1.0 to 6.9 15 to 100
5.5 to 17.2 80 to 250
If the regulator vents fluid or a leak
develops in the system, it indicates that
service is required. Failure to take the
regulator out of service immediately may
create a hazardous condition.
Personal injury, equipment damage or
leakage due to escaping fluid or bursting
of pressure-containing parts may result
if this regulator is overpressured or
is installed where service conditions
could exceed the limits given in the
Specifications section, or where
conditions exceed any ratings of the
adjacent piping or piping connections.
To avoid such injury or damage, provide
pressure-relieving or pressure-limiting
devices (as required by the appropriate
code, regulation or standard) to
prevent service conditions from
exceeding limits.
Additionally, physical damage to the
regulator could result in personal injury
and property damage due to escaping
fluid. To avoid such injury and damage,
install the regulator in a safe location.
Clean out all pipelines before installation of the
regulator and check to be sure the regulator has not
been damaged or has collected foreign material during
shipping. For NPT bodies, apply pipe compound to
the external pipe threads. For flanged bodies, use
suitable line gaskets and approved piping and bolting
practices. Install the regulator in any position desired,
unless otherwise specified, but be sure flow through
the body is in the direction indicated by the arrow on
the body.
1. The pressure/temperature limits in this installation guide and any applicable standard or code limitation should not be exceeded.
Type 6492
MAXIMUM ALLOWABLE INLET PRESSURE
TYPE
bar psig bar psig bar psig Cast Iron Body Steel/Stainless Steel Body
Table 2. Maximum Inlet and Outlet Pressures
Cast Iron Steel/Stainless Steel
MAXIMUM OPERATING
OUTLET PRESSURE
MAXIMUM EMERGENCY OUTLET PRESSURE
6492HT - - - - - - - - 20.7 300 17.2 250 - - - -
6492H 17.2 250 20.7 300 10.3 150
6492L 17.2 250 20.7 300 1.7 25 6.9 bar / 100 psig 6.9 bar / 100 psig
Note
It is important that the regulator be
installed so that the vent hole in the
spring case is unobstructed at all times.
For outdoor installations, the regulator
should be located away from vehicular
traffic and positioned so that water, ice
and other foreign materials cannot enter
Adjustment
To change the outlet pressure, remove the closing
cap or loosen the locknut and turn the adjusting
screw clockwise to increase outlet pressure or
counterclockwise to decrease pressure. Monitor
the outlet pressure with a test gauge during the
adjustment. Replace the closing cap or tighten the
locknut to maintain the desired setting.
17.2 bar / 250 psig or main
valve body rating limit,
whichever is lower
20.7 bar / 300 psig or main
valve body rating limit,
whichever is lower
20.7 bar / 300 psig or main
valve body rating limit,
whichever is lower
the spring case through the vent. Avoid
placing the regulator beneath eaves or
Taking Out of Service (Shutdown)
downspouts, and be sure it is above the
WARNING
probable snow level.
Overpressure Protection
The recommended pressure limitations are
stamped on the regulator nameplate. Some type of
overpressure protection is needed if the actual inlet
pressure exceeds the maximum operating outlet
pressure rating. Overpressure protection should
also be provided if the regulator inlet pressure
is greater than the safe working pressure of the
downstream equipment.
Regulator operation below the maximum pressure
limitations does not preclude the possibility of damage
from external sources or debris in the line. The
regulator should be inspected for damage after any
overpressure condition.
Startup
The regulator is factory set at approximately
the midpoint of the spring range or the pressure
requested, so an initial adjustment may be required
to give the desired results. With proper installation
completed and relief valves properly adjusted, slowly
open the upstream and downstream shutoff valves.
To avoid personal injury resulting from
sudden release of pressure, isolate
the regulator from all pressure before
attempting disassembly.
Parts List
Types 6492L and 6492H
Key Description
1 Body
2 Valve Guide
3 Valve Spring
4* Inner Valve
5* Orice
7* Valve Stem
8* Bellows Retainer
9* Bellows
10* Diaphragm
11 Lower Spring Seat, Types 6492H and 6492HT Pilots only
12 Control Spring
13 Upper Spring Seat
14 Spring Case
15 Adjusting Screw, standard spring case only
16 Hex Nut, standard spring case only
17 Cap Screw
18* Diaphragm Gasket
19 Drive Screw
20 Nameplate
24 Diaphragm Plate Assembly, Type 6492L Pilot only
74 Pipe Plug
76 Bleed Restriction
77 Screen
78 Reducing Bushing
87 Sealing Washer, tapped spring case only
!
*Recommended spare part.
2
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