Dresser RB 4600 User manual

RB 4600
Gas Pressure Regulator
3400992805
AC
Instruction Manual
Gas Regulators

2

3

4
This manual aims to provides relevant information for
the installation, commissioning and maintenance of RB
4600 or regulator.
The RB 4600 pressure regulator is a combination of ac-
tive regulator and monitor regulator - both of RB 4700
type - with upstream slam-shut valve.
RB 4700 instruction manual item no 3400992806 on
request
It may be tted with an integrated safety shut-o de-
vice type SSV 8500 or SSV 8600.
The operation and maintenance of the latter devices
are described in:
• Instruction Manual 3850992802:
Safety Shuto Valve Series 8500,
or
• Instruction Manual 3850992803:
Safety Shuto Valve Series 8600.
Technical features
Allowable pressure PS: 25 bar
Inlet pressure pumax: 19 bar
Outlet pressure range wh:
• 5 mbar to 13 bar
Accuracy class: up to AC 1
Closing pressure class: up to SG2,5
Operating temperature range:
-20°C to +60°C
• The product is classied along the Pressure Equipment
Directive (PED) as Category II
Product classication is based on the following volumes:
DN
1,2 2 2,5 6,4 6,4
Volume (dm3) carrying inlet pressure
25 40 50 80 100
RB
4600
Volume (dm3) carrying outlet pressure
1,2 2 2,5 6,4 6,4
RB
4600

5
INLET PRESSURE OUTLET PRESSURE
MOTORIZATION PRESSURE - MONITOR MOTORIZATION PRESSURE - ACTIVE
FEEDING PRESSURE
Fig 2 - RB 4600 sectional view
Regulator spring ranges
Spring characteristics:
d : wire diameter
De: external diameter
Lo: height
It: nber of spire
TF 511 20565125 2.5 35 50 6 5 - 25
TF 511 20565126 3 35 50 6 20 - 68
TF 511 20565127 3.5 35 50 6 40 - 140
TF 511 20565128 4 35 50 6 80 - 280
TF 512 20565128 4 35 50 6 0.1 - 0.6
TF 512 20565129 4.5 35 50 6 0.2 - 1.0
TF 513 20565132 3.5 35 60 6.5 0.3 - 1.3
TF 513 20565133 4 35 60 6.5 0.5 - 2.5
TF 513 20565131 5 35 60 6.5 1.5 - 5.5
TF 513 20565134 6 35 60 6.5 4.0 - 13
Pilot Type Spring Code Spring Characteristics Spring Range
D De Lo It mbar bar
mm mm mm mm

6
Installation
• Check that the maximum inlet pressure is not higher
than the design pressure of the regulator.
• Regulator should be lifted only with belts around the
body.
• Arrange enough room for the serving of the regula-
t o r.
Before installing the pressure regulator in the piping,
the following must be checked:
• the upstream and downstream anges must be
parallel so as to install the regulator without undue
stress.
• the upstream piping must be cleaned from all impu-
rities (sand, welding slag, etc.)
• the pressure regulator must not be visibly damaged.
• the inlet and outlet chambers of the pressure regula-
tor must be perfectly clean.
Make sure that the direction of gas ow corresponds to
the arrow on the pressure regulator body.
When tightening the ange bolts, the following maxi-
mum torque - applicable to Class 5.6 bolts should not
be exceeded:
For ease of operation, we recommend performing installation with the
valve body in horizontal alignment, with actuator upwards.
Installation with actuator downwards or vertical in-
stallation are also possible.
Fig 3 gives a typical example of installation:
• The downstream vent valve eases start-up and chang-
es in pressure setting
• The creep relief valve - optional -limits pressure surges
(example: gas thermal expansion in caseof down-
stream piping exposed to sun radiation at zero ow).
Outlet buer volume
In case of fast variations of gas demand (ON/OFF), the
response time of the regulator may cause transient pres-
sure surges or drops that may trigger the overpressure
or under-pressure protection devices. These pressure
changes can be limited to acceptable values by provid-
ing for a enough downstream piping volume.
Sensing line
The sensing line must be connected to a section rea-
sonably free from turbulences, preferably in a straight
section of the downstream piping as shown in Fig
3. Outlet pipe dimensions shall be such that the gas
velocity at pressure sensing tap does not exceed those
given below:
• Outlet pressure < 200 mbar
15 to 20 m/s
• Outlet pressure > 200 mbar
20 to 40 m/s
M12 M14 M16 M20
35 Nm 55 Nm 85 Nm 170 Nm

7
Fig 4 - Typical installation - RB 4700 active regulator, monitor regulator and SSV 8600 shuto valve
RB 4600 operates such as illustrated, but inside of one common body

8
Pipework should be made to prevent impurities and con-
densates from collecting and obstructing the passage
of the gas.
Pipework slope upwards from the pressure tap is recom-
mended - see Fig 5.
Installation with safety systems
SSV
The SSV must have a dedicated sensing line, whose
point of sensing provides a representative pressure. An
isolating valve on the sensing line is not permitted.
Monitor
The RB 4600 regulator includes 2 separate control sys-
tems built onto a single valve body. Both sensing lines
shall be piped downstream, as shown in the Fig 4.
180°
REMARKS FOR USE IN POTENTIALLY EXPLO-
SIVEATMOSPHERES(ATEX):
• If lm of rust is possible (ying rust in the imme-
diate product surroundings), all outer alumini-
umpartshavetobeprotectedaccordingly(e.g.byvar-
nish).
• The product must be electrically connected to ade-
quatelyearthedinstallation.
• For installation, removing or repair of the prod-
uct on site, only tools allowed for the correspond-
ingexplosionareacanbeused.
• The product shall not be exposed to: ames, ion-
isedradiationandultrasound.
• Ambient temp. conditions must be considered, in-
cludingpossibleadditionalheatingeectsduetooth-
erdevicesinimmediatevicinity.
• Gas pressure regulator according to DIN EN 334 - if not
equipped, with any electronic device - do not have a
potential ignition sourse and therefore are not in the
scope of European directive 2014/23/EU.

9
Regulator Start-up
After the pressure regulator has been installed, make
sure that the on/o valve upstream and downstream
and the vent valve are all closed.
• partially open the upstream on/o valve slowly
enough to pass a very small amount of gas;
• reset the safety shuto valve (see the relevant In-
struction Manual). Note that a safety shuto valve
with over and under-pressure protection is always
closed in absence of gas downstream from the regu-
lator, where its sensing line is connected.
• check that the pressure rises slowly; the down stream
pressure must stabilize around the set value. If the
pressure continues to rise, interrupt the starting
procedure by closing the upstream on/o valve and
identify the cause of the malfunction;
• after the outlet pressure has stabilized, open the on/
o valve completely;
• then slowly open the downstream on/o valve until
the piping is completely lled.
At this point, the pressure regulator is operative.
Monitor Start-up
The same procedure must be followed when starting
a monitor and active system, bearing in mind that the
pressure gauge installed in the section in between the
two regulators must indicate the same pressure value
as the upstream gauge.
Pressure Regulator Setting
The pressure regulator is usually delivered already
set to the specications indicated in the order sheet.
Whenever the set pressure must be modied, this value
must be set within the setting range Waof the spring
installed.
Make sure there is a ow demand or open the vent
valve downstream of the regulator. This valve should be
closed after the desired set pressure is obtained.
• To increase the set pressure:
rotate clockwise the adjustment screw on top of the
pilot - see Fig 1.
• To decrease the set pressure:
proceed as above, rotating the spring adjustment
screw counter-clockwise.

10
Maintenance
The maintenance operations required for the pressure
regulator (and the safety shuto valve) are closely linked
to the quality of gas supplied (in terms of moisture con-
tent, liquid hydrocarbons and impurities in general)
and to the degree of ltration performed upstream of
the pressure regulator. For this reason we recommend
always installing a cartridge lter upstream from the
pressure regulator that is capable of withholding the
solid and liquid particles present in the gas that might
otherwise compromise ecient operation.
All pressure must be discharged before performing any
maintenance operation on the pressure regulator by
proceeding as follows:
• Close the on/o valves upstream and downstram,
• Slowly discharge the pressure by opening the vent
valve downstream from the pressure regulator until
the gauge indicates zero.
Before performing any maintenance operation on pres-
sure regulators tted with overpressure and under-
pressure shuto devices, open the bypass between the
inlet and outlet chambers (see Instruction Manuals for
safety shuto valve). This relieves the pressure that oth-
erwise would be trapped upstream from the valve disc
of the safety shuto device.
Disassembly
• Check the following before beginning any disas-
sembly operations on the pressure regulator:
• The regulator must be depressurized as described
above;
• The wrenches and other tools required for the opera-
tion must be close at hand;
• Spare parts to replace damaged parts must be imme-
diately available.
Remember to:
• Disassemble all parts carefully in order to avoid dam-
age. Pay extra attention to the rubber parts (using the
appropriate tool for the disassembly of the O-rings)
and replace all parts that exhibit even the slightest
signs of damage.
Built-in safety valve
Thanks to its modular design, the retrot - or change
of safety valve model - can be easily made on the eld
without dismounting the regulator from the gas line.

11
Tools
This table indicates the tool relevant for the various parts as shown by position number (see Sectional views)
Recommended tools
Ref B - Box spanner
Fef C - Spanner O Ring extracting tool
Ref A - Hexagonal
socket T wrench
Nominal
tool
size DN25 DN80 DN100
A
2 35
3 14-24-35 14 - 35 14 - 35
4 48 48 48 48 311
5 24 24 314-319-333-340
6 17 - 51 17-29-51 51 51
8 17 - 29 17 - 29
B13 13 13 13 13
30
C
9 326
10
13 11-20-403 11 11 11 306 - 317
14 301
17 20 - 403
19 21 21 21
22 39 39 20-39-403
30
50 16 - 52 16 - 52 16 - 52
Tool
Type
Regulator Size
DN40
DN50
Pilot
14-24

www.dresserutility.com
3400992805 AGR RB 4600 Instruction Manual DUS.AGM.EN.AC
8.23
© 2023 Dresser Utility Solutions GmbH – All rights reserved. Dresser Utility
Solutions reserves the right to make changes in specications and features
shown herein, or discontinue the product described at any time without notice
or obligation. Contact your Dresser Utility Solutions representative for the most
current information. The Dresser Logo and all Trademarks containing the term
“Dresser” are the property of Dresser, LLC, a subsidiary of Baker Hughes.
Actaris™ is a trademark owned by Itron, Inc. and used under license.
Dresser Utility Solutions GmbH
Hardeckstr. 2
76185 Karlsruhe
T: +49 (0)721 / 5981 - 100
[e-mail]