Fisher Instruction Manual: RB Series Regulating System (Asia Pacific Only) | Fisher Manuals & Guides
Instruction Manual
D103251X012
December 2018
RB Series
Regulating System
RB Series Regulating System
Contents
1. Introduction ........................................................3
2. Technical Data and Features ..........................................3
3. Structure and Principle of Operation ...................................4
4. Selection of Spring ..................................................5
5. Flow Chart (SCMH) ..................................................5
6. Installation .........................................................5
7. Usage .............................................................7
8. Maintenance .......................................................8
9. Assembly and Disassembly Points to Note ..............................9
10. Ordering Guide ................................................... 12
!
WARNING
Failure to follow these instructions or to properly install and maintain this equipment could result in an explosion, fire
and/or chemical contamination causing property damage and personal injury or death.
Jeon regulators must be installed, operated and maintained in accordance with federal, state and local codes, rules and
regulations and Emerson Process Management Regulator Technologies, Inc. instructions.
If the regulator vents gas or a leak develops in the system, service to the unit may be required. Failure to correct trouble
could result in a hazardous condition.
Installation, operation and maintenance procedures performed by unqualified personnel may result in improper
adjustment and unsafe operation. Either condition may result in equipment damage or personal injury. Call qualified
personnel when installing, operating and maintaining the RB Series regulating system.
2
2
RB Series Regulating System
1. Introduction
RB Series (wall-mountable) regulating box can be deployed for natural gas distribution system in the residential or in the commercial
market segment. It can be used for gas services including natural gas, manufactured gas and liqueed petroleum gas, etc.
The basic types include Types RB, RBT, RBQ and RBQT.
R X □ / 0.4 □ □
Internal codes (RB, RBT, RBQ and RBQT)
Structure types (A - 1+0; B - 1+1; C - 2+0). See Table 1 for dimensions.
Maximum inlet pressure (MPa)
Rated ow
Gas Regulator Box
Figure 1. RB Series Regulating System
Box Body
RB1+0
Backplate
Connecting Bolt
RBQ1+0
RBT1+0
Figure 2. RB Series Parts
Box Body
2. Technical Data and Features
Inlet Pressure Range (P1)
Outlet Pressure Range (P2)
Regulating Accuracy : Up to AC 5
Lockup Accuracy: Up to SG 10
Slam-shut Accuracy: Up to AC5
Temperature Capability
Body Size and End Connection: See Table 1
(1)
: 0.02 to 0.4 MPa / 2.9 to 58.0 psig
(1)
: 1.5 to 30 KPa / 0.22 to 4.35 psig (See Table 2 for available spring ranges)
(1)
: -20 to 60°C / -4 to 140°F
Filtration Module
Regulator Module
Pressure Measuring
Nipple
Connecting bolt
Outlet Ball Valve
Inlet Ball Valve
RB1+1
RB2+0
RBQT1+0
Box Body
Bellow
Features:
•Modular design
•Filter system
•Automatic overpressure micro relief
•High-accuracy 2-stage regulator
•Designed for ease of operation and maintenance
•“Loose” inlet/outlet flange connections
•Automatic overpressure shut off
1. The pressure/temperature limits in this Manual and any applicable standard or code limitation for valve should not be exceeded.
3
3
RB Series Regulating System
Table 1. RB Series Body Size and End Connection
STRUCTURAL
MODEL
RB
RBT
RBQ
RBQT
Type RBT is added with bypass connection ports based on RB1+0, with G threaded connection.
Type RBQT is added with bypass connection ports based on RBQ1+0, with quick-action coupling acc. to GB/T 5860 or ISO 7241-1.
Note: If you have demands for products with nominal ow higher than 100 SCMH or other special requirements, please contact Emerson Process Management Regulator Technologies Inc.
authorized agent or sales company.
TYPE
1+0 25/40 25 25
1+0 50/80/100 25 40 10
1+1 25/40 25 25 35
1+1 50/80/100 25 40 43
2+0 25/40 25 25 35
2+0 50/80/100 25 40 43
1+0 25/40 25 25 15 15 13
1+0 50/80/100 25 40 15 25 16
1+0 25 25 25
1+0 50/80/100 50 50 16
1+0 25 25 25 15 15 15
1+0 50/80/100 50 50 15 25 20
NOMINAL
FLOW,
SCMH
INLET
FLANGE,
DN
OUTLET
FLANGE,
DN
BYPASS
INLET,
DN
N/A N/A
N/A N/A
BYPASS
OUTLET,
DN
NET WEIGHT
OF REGULATOR
BOX, kg
9
12
CENTER DISTANCE OF
INLET AND OUTLET
FLANGES, mm
155
280/3001+0 40 40 40 14
3001+0 40 40 40 15 15 18
according to
HG20592 PN16
3. Structure and Principle of Operation
RB Series regulator box consists of inlet and outlet ball valves, ltration module, regulator module and box body (see Figures 1
and 2). The regulator module includes shut off, 1st stage regulation, 2nd stage regulation and micro relief.
Regulator operational concept (See Figure 3): After the gas had gone through the rst stage regulator and had stabilized the
intermediate pressure, it will then go through the second stage regulator. The second stage regulator will reduce the pressure
to the desired outlet pressure, P2.
When P2 meets the relief set pressure, the relief valve will open to release the sudden increase in pressure caused by environmental
temperature uctuations or other factors. This is to prevent “false shutoff” or accidental trip by the slam-shut valve when there
is a sudden erratic increase in pressure and to maintain the pressure at the setpoint, P2.
When the slam-shut valve registered P2 is higher than the set pressure, the latching mechanism is released and the spring will
assist to close speedily and to seal tightly the slam-shut orice with the pad. This will cut off the ow in the valve and prevent
damages to downstream equipment.
Upon correcting the cause of overpressure, pull and latch the reset bar to allow normal ow operation again.
FLANGE
STANDARD
Flange
connection
dimensions
Figure 3. RB Series Operational Schematic
FIRST STAGE ORIFICE
FIRST STAGE
REGULATOR
FIRST STAGE
DIAPHRAGM
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE
4
4
SLAM-SHUT PAD
SLAM-SHUT
VALVE
SLAM-SHUT
RESET BAR
FILTRATION MODULE
FILTER
ELEMENT
FILTER CAP
SECOND STAGE
REGULATOR
REGULATOR
ADJUSTMENT
SCREW CAP
RELIEF
ADJUSTMENT NUT
SECOND STAGE
ORIFICE PAD
RELIEF
VALVE
REGULATOR
CAP
Loading...