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
the spring case through the vent. Avoid
placing the regulator beneath eaves or
downspouts, and be sure it is above the
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.
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.
Taking Out of Service (Shutdown)
!
WARNING
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
TYPE
MAXIMUM ALLOWABLE INLET PRESSURE
MAXIMUM OPERATING
OUTLET PRESSURE
MAXIMUM EMERGENCY OUTLET PRESSURE
Cast Iron Steel/Stainless Steel
bar psig bar psig bar psig Cast Iron Body Steel/Stainless Steel Body
6492HT - - - - - - - - 20.7 300 17.2 250 - - - -
20.7 bar / 300 psig or main
valve body rating limit,
whichever is lower
6492H 17.2 250 20.7 300 10.3 150
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
6492L 17.2 250 20.7 300 1.7 25 6.9 bar / 100 psig 6.9 bar / 100 psig
Table 2. Maximum Inlet and Outlet Pressures
*Recommended spare part.
Type 6492
2
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