Data Sheet

Bulletin 71.4:MR108
6
with actuator on the side, however, this could result in
premature wear of parts. Orientation of the two vents
should always be down. Vents may be rotated after
regulator installation to reposition so that the vent
screens are down.
A control line must be installed to allow inlet pressure
to register on the actuator’s diaphragm. The size of the
control line is indicated in the Specication sections
above and should be installed four to eight pipe
diameter before the backpressure regulator and in an
area of pipe that is free of turbulence.
An instruction manual is provided with every regulator
shipped. Refer to this for detailed installation,
operation, adjustment and maintenance instructions.
The instruction manual includes a complete listing of
individual parts and recommended spare parts.
Applications
Note
Alinearcageisrecommendedfor
applicationswherelowowstability
isaconcernbutitwilllimittheoverall
capacityoftheregulator.
Table 5. Maximum Inlet, Outlet and Emergency Casing Pressures
(1)
BODY
MATERIAL
END
CONNECTION
MAXIMUM
INLETPRESSURE
MAXIMUM
OUTLETPRESSURE
MAXIMUMEMERGENCY
CASINGPRESSURE
Low-Pressure
Actuator
High-Pressure
Actuator
(2)
Low-Pressure
Actuator
High-Pressure
Actuator
(2)
Low-Pressure
Actuator
High-Pressure
Actuator
(2)
psig bar psig bar psig bar psig bar psig bar psig bar
Cast Iron
NPT
70 4.8
340 23.4
70 4.8
340 23.4
70 4.8
340 23.4
CL125 FF 175 12.1 175 12.1 175 12.1
CL250 RF 400 27.6 400 27.6 400 27.6
WCC Steel
NPT
70 4.8
400 27.6
70 4.8
400 27.6
70 4.8
400 27.6
CL150 RF 245 16.9 245 16.9 245 16.9
CL300 RF
400 27.6 400 27.6 400 27.6
CL600 RF
PN 16 RF 245 16.9 245 16.9 245 16.9
PN 16/25/40 RF 400 27.6 400 27.6 400 27.6
CF8M Stainless
steel
NPT
70 4.8
400 27.6
70 4.8
400 27.6
70 4.8
400 27.6
CL150 RF 225 15.5 225 15.5 225 15.5
CL300 RF
400 27.6 400 27.6 400 27.6
CL600 RF
PN 16 RF 225 15.5 225 15.5 225 15.5
PN 16/25/40 RF 400 27.6 400 27.6 400 27.6
CF3M Stainless
steel
NPT
70 4.8
400 27.6
70 4.8
400 27.6
70 4.8
400 27.6
CL150 RF 185 12.7 185 12.7 185 12.7
CL300 RF
400 27.6 400 27.6 400 27.6
CL600 RF
PN 16 RF 185 12.7 185 12.7 185 12.7
PN 16/25/40 RF 400 27.6 400 27.6 400 27.6
1. Pressure ratings are based on a maximum operating temperature of 250°F / 121°C.
2. Maximum inlet, outlet and emergency pressures for constructions with Fluorocarbon (FKM) diaphragm are limited to 230 psig / 15.8 bar or the body rating limit, whichever is lower.
OverpressureCondition
Depending upon construction, backpressure control
ratings are from 5 to 300 psig / 0.34 to 20.7 bar.
The maximum inlet pressure can be found in
Table 5. System operation within these limitations
does not eliminate the possibility of damage from
external sources or from debris in the ow line. The
backpressure regulator should be inspected for damage
regularly and after any overpressure condition.
Installation
Note
Notallcodesorregulationswill
permittheseunitstobeusedasnal
overpressureprotectiondevices.
Vertical installation with the actuator installed directly
above or below the main valve is recommended but for
optimal performance the actuator should be installed
below the main valve. The use of a bleed valve is
recommended for liquid installations that require the
high pressure actuator to be mounted above the main
valve. The unit will operate in horizontal installations