DG Series Regulators
3
!
WARNING
Table 1.
Body Sizes and End Connection Styles
1. Introduction
Scope of the Manual
This instruction manual provides installation, adjustment, maintenance and parts ordering information for DG Series
direct-operated Pressure Reducing Series Regulators and Backpressure Series Regulators.
Description
DG Series are multipurpose direct-operated regulators that use fluid pressure to drive the actuator and automatically
maintains the outlet pressure or inlet pressure constant. They are available in Pressure Reducing (PRV) and Backpressure (BPV)
configurations to control outlet pressure or inlet pressure respectively. They have high-capacity, fast response, tight-shutoff,
superior control and stability and can be used in a variety of industrial gas and liquid applications such as: Nitrogen, Carbon
Dioxide, Natural Gas, Oil, Water, Methanol, Alcohol, Naphtha and similar media.
2. Specifications
Body Sizes and End Connection Styles:
See Table 1
Accuracy Class:
AC5
～
AC10
Shutoff Classification per ANSI/FCI 70-3-2004:
Class VI (Soft seat)
Construction Materials:
See Table 2
Maximum Inlet, Outlet and Emergency Casing Pressure
(1)
:
See Table 3, DG Pressure Reducing Series
See Table 4, DG Backpressure Series
Control Pressure Range
(1)
:
See Table 5, DG Series Pressure Reducing Regulator Spring
Set Range
See Table 6, DG Series Backpressure Regulator Spring Set Range
Maximum Setpoint of Pressure Reducing Regulator
(1)
:
Low-Pressure Actuator (DOA330):
3.0 bar / 43 psig
High-Pressure Actuator (DOA180):
Nitrile (NBR) Diaphragm:
25 bar / 363 psig
Fluorocarbon (FKM) Diaphragm:
10 bar / 145 psig
Maximum Setpoint of Backpressure Regulator
(1)
:
Low-Pressure Actuator (DOA330):
2.3 bar / 33.4 psig
High-Pressure Actuator (DOA180):
Nitrile (NBR) Diaphragm:
25 bar / 363 psig
Fluorocarbon (FKM) Diaphragm:
10 bar / 145 psig
Maximum Differential Pressures
(1)
:
See Table 8
Flow and Sizing Coefficients:
See Table 9, Wide Open Flow and Sizing Coefficients
Temperature Capabilities
(1)
:
Nitrile (NBR):
-29 to 80°C / -20 to 176°F
Fluorocarbon (FKM):
-7 to 120°C / 19 to 248°F
(2)
Pressure Registration:
External
Down Stream Control Line Connection Size:
1/4 NPT
Maximum Pressure Over Setpoint to Avoid Internal
Parts Damage
(1)
:
Low-Pressure Actuator:
0.6 bar / 8.7 psig or
1.3 times setpoint, whichever is larger
High-Pressure Actuator:
5.7 bar / 82.6 psig
Dimension and Estimated Weight:
See Table 7
To avoid possible personal injury, equipment damage or leakage due to escaping fluid do not stand on or apply an
external load to the actuator or any part of the regulator while working around the regulator.
DG SERIES PRESSURE REDUCING REGULATOR (PRV)
DG SERIES BACKPRESSURE RAGULATOR (BPV)
BODY SIZES
DN 25, 50, 80, 100 / NPS 1, 2, 3, 4
BODY END FLANGE CONNECTION STYLES
CL150 RF, CL300 RF, GB PN 16/25/40
1. The pressure/temperature limits in this Manual or any applicable standard limitation should not be exceeded.
2. Fluorocarbon (FKM) is limited to 93°C / 200°F in hot water.