Emerson VS-FL Series Instruction Manual
Type VS-FL
Instruction Manual
0017EN-VSFL-IM
January 2010 - Rev. 03
D103654X012
TM
SUMMARY
Introduction ........................................................................ 1
P.E.D. Categories and Fluid Group ................................... 2
Characteristics ................................................................... 2
Labelling ............................................................................ 2
Overpressure Protection .................................................... 3
Transport and Handling ..................................................... 3
Atex Requirements ............................................................ 3
Pilots .................................................................................. 4
Operation ........................................................................... 4
Dimensions and Weights ................................................... 5
Installation ......................................................................... 5
Startup ............................................................................... 6
Pilot Adjustment ................................................................. 6
Shutdown ........................................................................... 7
Periodical Checks .............................................................. 7
Relief Valve Maintenance .................................................. 7
Type PRX/182 Pilot Maintenance ...................................... 8
Spare Parts ........................................................................ 9
Troubleshooting ................................................................. 9
Parts Lists .......................................................................... 10
Schematic Assemblies ....................................................... 11
INTRODUCTION
Scope of Manual
This manual provides instructions for installation, startup,
maintenance and spare parts ordering for the VS-FL Series
pilot operated relief valves and for PRX/182 pilot.
Product Description
The VS-FL Series relief valves are axial ow type with a
single seat and counterbalanced shutter.
They are used in reduction, distribution and conveying
stations using suitably ltered natural gas.
They can also be used for air, propane, butane, LPG, city
gas, nitrogen, carbon dioxide and hydrogen.
The following versions are available:
VS-FL-BP : For low and mid pressure applications
Pilot PRX/182
VS-FL : For mid and high pressure applications
Pilot PRX/182 or PRX-AP/182
Also available version with type SR silencer.
All standard gas pressure devices (relief valves) used
in assemblies will comply to EN 12186 and EN 12279
standards.
Any accessories (e.g. pilots) used on the Emerson Process
Management range of relief valves, must be manufactured
by one of the Emerson Process Management companies
and bear that manual.
If this is not respected, Emerson Process Management will
not be responsible in the case of any inefciency.
Pilot-Operated Relief Valves
Figure 1. Relief Valve Type VS-FL with PRX/182 Pilot
Type VS-FL
2
P.E.D. CATEGORIES AND FLUID GROUP
The VS-FL/ Pilot-Operated Series relief valves are designed
as functional equipments and they are typically used in gas
pressure reducing stations for overpressure protection by
releasing small amounts of gas in the event of not perfect
pressure relief valve closing.
Table 1. P.E.D. Category for VS-FL Series Relief Valves
PRODUCT SIZE CATEGORY FLUID GROUP
DN 25 - 40 - 50 - 65 - 80 - 100 - 150 - 200 IV 1
If VS-FL/ series relief valve is used as full-capacity relief
device (according clause 8.3.2 EN 12186) , downstream
equipments protected by this products shall have technical
features such as not to be category higher than following
category (according Directive 97/23/EC “PED”).
Possible built-in pressure accessories (e.g. pilots PRX/
series or lters SA/2, FU/ and FD-GPL/) conform to Pressure
Equipment Directive (PED) 97/23/EC Article 3 section 3 and
were designed and manufactured in accordance with sound
engineering practice (SEP).
Per Article 3 section 3, these “SEP” products must not bear
the CE marking.
CHARACTERISTICS
Body Sizes and End Connection Styles
VS-FL-BP
DN 25 - 40 - 50 - 65 - 80 - 100 - 150
PN 16
ANSI 150 anged
VS-FL
DN 25 - 40 - 50 - 65 - 80 - 100 - 150 - 200
ANSI 300 - 600 anged
The pressure/temperature limits indicated
in this instruction manual or any applicable
standard or code limitation should not be
exceeded.
Maximum Operating Inlet Pressure
PN 16 : 16 bar
ANSI 150 : 20 bar
ANSI 300 : 50 bar
ANSI 600 : 100 bar
At average ambient temperature.
Outlet Set Pressure Ranges
VS-FL-BP PN 16 ANSI 150 DN 25-40-50 : 0.5 ÷ 8 bar
VS-FL-BP PN 16 DN 65-80-100-150 : 0.5 ÷ 16 bar
VS-FL-BP ANSI 150 DN 65-80-100-150 : 0.5 ÷ 19.3 bar
VS-FL ANSI 300 all sizes : 1 ÷ 50 bar
VS-FL ANSI 600 all sizes : 1 ÷ 80 bar
Minimum/Maximum Allowable Temperature (TS)
See label.
Temperature
Standard Version : Working -10° to 60°C
Low Temperature Version : Working -20° to 60°C
Materials
Flanges and covers: Steel
Diaphragms : Fabric Nitrile (NBR) + PVC
Nitrile (NBR) rubber
Pads : Nitrile (NBR) rubber
(FKM available on request)
LABELLING
Figure 2. Label for VS-FL Series Relief Valves
APPARECCHIOTIPO/DEVICE TYPE
Wau
DN2
DN1
MATRICOLA
bar
bar
SERIAL Nr.
°C
FLUIDO GRUPPO
FLUID GROUP
ANNO
YEAR
HARMONIZED STD.
bar
NORME ARMONIZ.
LEAKAGE CLASS
CLASSE DI PERDITA
FUNCTIONAL CLASS
CLASSE FUNZIONALE
bar
Wao
Wa
TS
bar
pao
Cg
PS
body
bar PT= xPS bar
PS
covers
EN
bar
pmax
xxxx
body
Notified
BOLOGNA ITALY
O.M.T.
1.5Nota4Nota3
Nota2
Nota1
1
-
!
WARNING
Type VS-FL
3
Note 1: See “Characteristics”
Note 2: Year of manufacture
Note 3: Class 1: -10°/60°C
Class 2: -20°/60°C
Note 4: PN 16 PS : 16 bar
ANSI 150 PS : 19.3 bar
ANSI 300 PS : 50 bar
ANSI 600 PS : 100 bar
OVERPRESSURE PROTECTION
The recommended safety pressure limitations are stamped
on the valve label.
Downstream overpressure protection shall be also provided
if the inlet pressure can be greater than the PS (see label).
Equipment’s operation below the maximum pressure
limitations does not preclude the possibility of damage from
external sources or debris in the line.
The relief valve should be inspected for damage after any
overpressure condition.
TRANSPORT AND HANDLING
Established transport and handling procedures shall be
followed to avoid any damage on the pressure containing
parts by shocks or anomalous stresses.
Ringbolts are designed just for handling of equipment
weight.
Built-up sensing lines and pressure accessories (e.g. pilots)
shall to be protected by shocks or anomalous stresses.
ATEX REQUIREMENTS
If the provisions of EN 12186 & EN 12279, national
regulations, if any, and specic manufacturer
recommendations are not put into practice before
installation and if purge by inert gas is not carried out before
equipment’s start-up and shut-down operations, a potential
external and internal explosive atmosphere can be present
in equipment & gas pressure regulating/measuring stations/
installations.
If a presence of foreign material in the pipelines is foreseen
and purge by inert gas is not carried out, the following
procedure is recommended to avoid any possible external
ignition source inside the equipment due to mechanical
generated sparks:
• drainage to safe area via drain lines of foreign materials, if
any, by inow of fuel gas with low velocity in the pipe-work
(5m/sec)
In any case,
• provisions of Directive 1999/92/EC and 89/655/EC shall
be enforced by gas pressure regulating/measuring station/
installation’s end user
• with a view to preventing and providing protection against
explosions, technical and/or organizational measures
appropriate to the nature of the operation shall be taken
(e.g. : lling/exhausting of fuel gas of internal volume
of the isolated part/entire installation with vent lines
to safe area - 7.5.2 of EN 12186 & 7.4 of EN 12279 ;
monitoring of settings with further exhaust of fuel gas to
safe area ; connection of isolated part/entire installation to
downstream pipeline; ….)
• provision in 9.3 of EN 12186 & 12279 shall be enforced
by pressure regulating/measuring station/installation’s end
user
• external tightness test shall be carried out after each
reassembly at installation site using testing pressure in
accordance with national rules
• periodical check/maintenance for surveillance shall be
carried out complying with national regulations, if any, and
specic manufacturer recommendations.
Type VS-FL
4
Table 2. Pilots Type PRX/182 and PRX-AP/182 Characteristics
Model
Allowable Pressure
PS (bar)
Set Range
Wd (bar)
Body and Covers
Material
PRX/182
100
0.5 - 40
Steel
PRX-AP/182 30 - 80
N.B.: 1/4” NPT female threaded connections
PILOTS
VS-FL relief valves are equipped with the PRX/ series pilots.
Figure 3. Closed VS-FL Relief Valve Figure 4. Opened VS-FL Relief Valve
OPERATION
The diaphragm unit (permanently connected to the shutter) divides the relief valve actuator into two chambers.
The chamber 1 is connected to the atmospheric pressure, chamber 2 is connected to the pilot.
In normal working conditions the two chambers are not containing pressure and the relief valve spring acts on the diaphragm unit
and closes the shutter.
If the line pressure exceeds the pilot set point, the pilot allows the gas to ow from the line to chamber 2.
The shutter moves to its open position when the force produced by gas pressure acting on the diaphragm unit becomes greater
than the load of the relief valve spring.
Once the excess gas is released and line pressure returns to normal working conditions, the pilot stops the pressure ow,
Chamber 2 is no longer being fed, it is emptied through the jet.
The diaphragm unit is pushed upward by the relief valve spring and the shutter moves to its closed position.
Pilot
PRX/182
Jet
A
B
L
A
B
L
Chamber 1 Chamber 1
Diaphragm unit
Relief valve spring
Chamber 2
Shutter
Pilot
PRX/182
Jet
Diaphragm unit
Relief valve spring
Chamber 2
Shutter
Type VS-FL
5
Figure 5. VS-FL Series Dimensions
Table 3. VS-FL Series Dimensions
DIMENSIONS AND WEIGHTS
DN
DIMENSIONS (mm)
WEIGHTS (Kg)
FACE TO FACE - I A
PN 16 - ANSI 150 ANSI 300 - ANSI 600 PN 16 - ANSI 150 ANSI 300 - ANSI 600 PN 16 - ANSI 150 ANSI 300 - ANSI 600
VS-FL-BP VS-FL VS-FL-BP VS-FL VS-FL-BP VS-FL
25 184 210 285 225 24 31
40 222 251 306 265 37 47
50 254 286 335 287 48 60
65 276 311 370 355 68 88
80 298 337 400 400 83 148
100 352 394 450 480 105 201
150 451 508 590 610 255 480
200* - 610 - 653 - 620
A
I
N.B.: (*) ANSI 300 I = 568 - 1/4” NPT female threaded connections
INSTALLATION
Figure 6. VS-FL Series Connection/Installation Schematic
NOTE: RECOMMENDED PIPING IS STAINLESS STEEL WITH 10 MM DIAMETER.
Jet
(0,75 mm)
A
B
L
PRX/182
VS/FL
Plug
To the atmosphere or in a safe area
To the atmosphere
or in a safe area
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