VSX4 and VSX8 Series Controller
!
WARNING
Failure to follow these instructions or to
properly install and maintain this equipment
could result in an explosion and/or fire
causing property damage and personal
injury or death.
Fisher™ controller must be installed, operated
and maintained in accordance with federal,
state and local codes, rules and regulations
and Emerson Process Management Regulator
Technologies, Inc. (Emerson) instructions.
Only a qualified person must install or
service the VSX4 and VSX8 Series controller.
If a leak develops or if the controller
continually vents gas, 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 operations which may result in
equipment damage or personal injury.
The VSX4 and VSX8 Series controller do
not activate in response to fire, seismic and
lightning events.
Figure 1. VSX4 and VSX8 Series Controller
Introduction
Scope of the Manual
This Instruction Manual provides installation, adjustment,
maintenance and parts ordering information for the VSX4
and VSX8 Series controller. Instructions for other equipment
used with the controller, such as pressure regulators, can be
found in separate instruction manuals.
Table of Contents
Introduction ..................................... 1
Specifications ................................... 2
Principle of Operation ............................. 4
Installation ...................................... 6
Dimensions ..................................... 7
Reed Switch .................................... 8
Startup and Shutdown ............................. 8
Commissioning .................................. 8
Controller Spring Adjustment ........................ 8
Maintenance ................................... 12
Parts Ordering .................................. 13
Parts List ...................................... 14
VSX4 and VSX8 Series
Instruction Manual
D103127X012
May 2018
Specifications
This section lists the specifications for the VSX4 and VSX8 Series controller. The following information is stamped on the
nameplate of VSX4 and VSX8 Series: Type and Class, Maximum Outlet Pressure and Spring Range. Additional operating
information is located on the Regulator nameplate.
1. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.
2. Product has passed Emerson testing for shutoff and trip function at -40°F.
Available Configurations
Types VSX4L and VSX8L: Low-pressure controller which
can be integrated into a regulator; with 10 to 1100 mbar /
0.15 to 16 psig downstream pressure
Types VSX4H and VSX8H: High-pressure controller
which can be integrated into a regulator; with 1100 to
4000 mbar / 16 to 58 psig downstream pressure
Controller Type
DS: Differential Strength
IS: Integral Strength
Functional Class
A: Min, Min and Max Installation
B: Max Installation Only
Connections
Controller Vent: 1/4 NPT
External Sensing Line: 1/4 NPT
Maximum Allowable Pressure (PS)
(1)
Differential Strength: 20.0 bar / 290 psig
Integral Strength: 6.0 bar / 87 psig
Specific Maximum Allowable Pressure (PSd)
(1)
6.0 bar / 87 psig
Maximum Inlet Pressure (P
umax
)
(1)
Differential Strength (DS): 16.0 bar / 232 psig
Integral Strength (IS): 6.0 bar / 87 psig
Valve Plug Size
VSX4 Series: 24 mm / 0.94 in.
VSX8 Series: 39 mm / 1.54 in.
Operating Temperature (TS)
(1)
According to PED Standards
-20 to 66°C / -4 to 150°F
Non-PED: -30 to 66°C / -22 to 150°F
(2)
Casing Material
Aluminum
Response Time (ta)
< 1 second
Resetting Trip Mechanism
Manually after Fault Rectification
Position Indicator
Extended stem visible in center of reset button
Pressure Registration
Internal or External
European EN Reference Standard
EN 14382
Approximate Shipping Weight
1.4 kg / 3.1 lbs
Options
Wire Seal - The VSX4 and VSX8 Series can be ordered
with an optional tamper-proof lock wire to preclude
unauthorized access to the adjustment springs.
Reed switch - An optional remote notification switch can
be installed offering the capability to remotely notify the
operator should VSX8 Series shut off occur. Reed switch is
available on our regulators CSB604/704 Series only.
Operating temperature: -40 to 70°C / -40 to 158°F
Degree of Protection: IP67
Product Marking: CE Ex II 2G Ex mb T6 6b
Cable length: 3 m / 118 in.
Product Description
The VSX4 and VSX8 Series controller are designed to shut off the ow of gas to the downstream system in the event of outlet pressure
rising above or falling below the predened levels.
• The VSX4 and VSX8 Series can be mounted on
various Emerson regulators or be used as standalone
Type VS100 units.
• The VSX4 and VSX8 Series can be integrated in a
slam-shut device Type VS100 installed upstream of the
associated regulator.
• The VSX4 and VSX8 Series controller are equipped with
an internal bypass.
• The VSX4 and VSX8 Series offer either internal or
external pressure sensing line, depending on the
regulator type and/or the specied conditions.
VSX4 and VSX8 Series
2
Figure 2. EN 14382-VSX4/VSX8 Series Label
Std: EN14382
SLAM-SHUT
PED mfg: Gallardon,
France
Pumax
Max IN
CLASS
TYPE
VSX8L VSX8H
VSX4L VSX4H
IS PS 6 bar Pumax 6 bar PSD 6 bar
DS PS 20 bar Pumax 16 bar PSD 6 bar
RELAIS
RELAY
Pdmax
Max OUT
MATL
CASE
Wdso
OP range
Alum
Pressure range following
service condition
IS 6 bar
DS 16 bar
LP 1.5 bar
HP 5.5 bar
PSD
Wdsu
UP range
A Min, Min and
Max installation
B Max installation
only
VSX8L VSX8H
VSX4L VSX4H
IS 6 bar
DS 16 bar
LP 1.5 bar
HP 5.5 bar
IS PS 6 bar P
umax
6 bar PSD 6 bar
DS PS 20 bar P
umax
16 bar PSD 6 bar
Pressure range following
service condition
A Min, Min and
Max installation
B Max installation
only
Table 2. Overpressure Shutoff (OPSO) Only Spring Ranges
SLAM SHUT DEVICE
Type
Inlet Pressure Over Pressure Shut-off (OPSO) Set Range OPSO Spring
bar psig mbar psig Part Number Spring Color
VSX4L
VSX8L
8.6 and 16 125 and 232
30 to 60 12 to 24 in. w.c. GF02168X012 Brown
40 to 110 16 in. w.c. to 1.6 psig GF02169X012 Red
60 to 193 24 in. w.c. to 2.8 psig GF02170X012 Orange
95 to 280 1.4 to 4.1 GF02171X012 Pink
138 to 500 2.0 to 7.3 GF02172X012 Green
221 to 760 3.2 to 11.0 GF02173X012 Silver
400 to 1450 5.8 to 21.0 GF04353X012 Yellow
VSX4H
VSX8H
16 232
400 to 1100 5.8 to 16.0 GF02171X012 Pink
580 to 2000 8.4 to 29.0 GF02172X012 Green
900 to 3000 13.1 to 43.5 GF02173X012 Silver
1600 to 5500 23.2 to 79.8 GF04353X012 Yellow
Figure 3. Nameplate for Explosive Atmosphere if ATEX Assembled
Table 1. Directive ATEX Information
TYPE CLASSIFICATION ATEX ASSEMBLIES ATEX LABELLING
VSX4
VSX8
Non-electrical equipment Not falling under the ATEX Directive 2014/34/EU No
VSX8 with Reed Contact
Non-electric equipment equipped with an
electrical device falling under the scope of the
ATEX Directive 2014/34/EU
Constitutes an assembly according to the
ATEX Directive 2014/34/EU
2 G T
No de Série
SERIAL No.
TYPE
FRANCEL SAS
Chartres FRANCE
An
YEAR
Utilisation
INDENTED USE
2 G T
VSX4 and VSX8 Series
3
Table 3. Combined Overpressure and Underpressure Shutoff (OPSO and UPSO) Spring Ranges
Principle of Operation
VSX4 and VSX8 Series Controller
The pressure measuring element of the controller consists
of a diaphragm that senses downstream pressure. The
downstream pressure is controlled by the regulator. The
overpressure shut-off spring and under-pressure shut-off
spring exerts force on the top side of the diaphragm.
When the downstream pressure increases above the
Overpressure Shutoff (OPSO) setting, the diaphragm
moves up.
When the downstream pressure decreases below the
Underpressure Shutoff (UPSO) setting, the diaphragm
moves down.
Both of these actions result in the rotation of the cam and
the release of the reset pin.
The valve plug spring then pushes the valve plug against
the regulator port, stopping the flow of gas. The reset
button is then used to reset (relatch) the controller
(refer to the Resetting Procedure section for detailed
resetting instructions).
Standard downstream pressure registration for the
controller is external; however, internal sensing line is made
available by removing the downstream sense blocking
screw, installing a 1/4 NPT plug in the control line port and
removing the downstream control line.
ACCURACY GROUP (AG) Pd < 35 mbar / 0.507 psig
35 mbar / 0.507 psig ≤ Pd
< 60 mbar / 0.87 psig
60 mbar / 0.87 psig ≤ Pd
< 100 mbar / 1.5 psig
Pd ≥ 100 mbar / 1.5 psig
AG
min
30 15
10 5
AG
max
10 10
Note: Stable inlet pressure AG
min
= AG 10 (Pd < 60 mbar / 0.87 psig) and AG 5 (Pd > 60 mbar / 0.87 psig), AG
max
= AG 5
Table 4. Controller Accuracy in Accordance to EN 14382
SLAM SHUT DEVICE
Type
Inlet Pressure
Under Pressure
Shut-off (UPSO)
UPSO Spring
Over Pressure
Shut-off (OPSO)
OPSO Spring
Set Range
Part Number Spring Color
Set Range
Over UPSO Setpoint
Part Number Spring Color
bar psig mbar psig mbar psig
VSX4L
VSX8L
8.6 125
7 to 11
ERAA05835A0 White
30 to 44
GF02167X012 Black7 to 15 32 to 44
7 to 30 3 to 12 in. w.c.
41 to 44 16 to 18 in. w.c.
40 to 76 16 to 29 in. w.c.
GF02168X012 Brown
10 to 75
4 in. w.c. to
1.1 psig
T14169T0012 Blue
48 to 74 19 in. w.c. to 1.1 psig
50 to 122 20 in. w.c. to 1.8 psig GF02169X012 Red
25 to 160
10 in. w.c. to
2.3 psig
T14170T0012 Silver 83 to 221 1.2 to 3.2
GF02170X012 Orange
100 to 500 1.5 to 7.3 FA142869X12 Orange Stripe
114 to 261 1.7 to 3.8
179 to 386 2.6 to 5.6 GF02171X012 Pink
241 to 565 3.5 to 8.2 GF02172X012 Green
100 to 750 1.5 to 10.9 T14171T0012 Olive 460 to 932 6.7 to 13.5 GF02173X012 Silver
16 232
7 to 30 3 to 12 in. w.c. ERAA05835A0 White
40 to 55 16 to 22 in. w.c. GF02167X012 Black
45 to 76 18 to 30 in. w.c.
GF02168X012 Brown
10 to 75
4 in. w.c. to
1.1 psig
T14169T0012 Blue
50 to 80 20 in. w.c. to 1.1 psig
62 to 132 25 in. w.c. to 1.9 psig GF02169X012 Red
25 to 160
10 in. w.c. to
2.3 psig
T14170T0012 Silver 83 to 221 1.2 to 3.2
GF02170X012 Orange
100 to 500 1.5 to 7.3 FA142869X12 Orange Stripe
114 to 261 1.6 to 3.8
179 to 386 2.6 to 5.6 GF02171X012 Pink
241 to 565 3.5 to 8.2 GF02172X012 Green
100 to 750 1.5 to 10.9 T14171T0012 Olive 460 to 932 6.7 to 13.5 GF02173X012 Silver
VSX4H
VSX8H
16 232
500 to 2000 7.3 to 29.0 FA142869X12 Orange Stripe
1050 to 1570 15.2 to 22.8 GF02171X012 Pink
1250 to 2300 18.1 to 33.4 GF02172X012 Green
500 to 2800 7.3 to 40.6 T14171T0012 Olive 2100 to 3750 30.5 to 54.4 GF02173X012 Silver
- Not available for North America.
VSX4 and VSX8 Series
4
OUTLET PRESSURE, P
d
INLET PRESSURE, P
u
ATMOSPHERIC PRESSURE, Pb
ERAA11922-02
Figure 4. VSX4/VSX8 Series Operational Schematics
DIAPHRAGM
CAM
RESET BUTTON
RESET PIN
VALVE PLUG
VALVE PLUG SPRING
DOWNSTREAM SENSE
BLOCKING SCREW
OVERPRESSURE SHUTOFF (OPSO)
ADJUSTING SCREW
UNDERPRESSURE SHUTOFF (UPSO)
ADJUSTING SCREW
UNDERPRESSURE
SHUTOFF (UPSO) SPRING
OVERPRESSURE
SHUTOFF (OPSO) SPRING
ERAA10261-AA
VSX8 SERIES
DIAPHRAGM
CAM
RESET BUTTON
RESET PIN
VALVE PLUG
VALVE PLUG SPRING
DOWNSTREAM SENSE
BLOCKING SCREW
OVERPRESSURE SHUTOFF (OPSO)
ADJUSTING SCREW
UNDERPRESSURE SHUTOFF (UPSO)
ADJUSTING SCREW
UNDERPRESSURE
SHUTOFF (UPSO) SPRING
OVERPRESSURE
SHUTOFF (OPSO) SPRING
VSX4 SERIES
VSX4 and VSX8 Series
5
Installation
!
WARNING
Personal injury or system damage may result if
this controller is installed, without appropriate
overpressure protection, where service
conditions could exceed the limits given by the
nameplates of either the regulator or controller
or exceed the limits indicated in the regulator
or controller instruction manuals.
All vents should be kept open to permit
free ow of gas to the atmosphere. Protect
openings against entrance of rain, snow,
insects or any other foreign material that may
plug the vent or vent line. When installing
outdoors, point the spring case vent of the
regulator and of the controller downward to
allow condensate to drain. This minimizes the
possibility of freezing and accumulation of
water or other foreign materials entering the
vent and interfering with proper operation.
Controller installations should be adequately
protected from physical damage.
The equipment should not receive any type
of shock causing damage to the casing and
therefore causing leaks.
No modication should be made to the
structure of the equipment (drilling, grinding
and soldering).
Under enclosed conditions or indoors,
escaping gas may accumulate and be an
explosion hazard. In these cases, the vent(s)
should be piped away from the regulator/
controller to the outdoors.
Failure to install a downstream control line
could result in a hazardous condition. Install
downstream control line(s) to the controller
when construction uses external pressure
registration. The regulator and controller
will not control pressure or shut off if a
downstream control line is not installed on
those constructions where external pressure
sensing line is required.
If the controller is exposed to an overpressure
condition, it should be inspected for any
damage that may have occurred. Controller
operation within ratings does not preclude the
possibility of damage from external sources or
from debris in the pipeline.
General Installation Instructions
Note
The VSX4 and VSX8 Series can be rotated
360° for easy installation and maintenance.
Install, use and maintain in accordance to all applicable
codes and standards.
Before proceeding to installation:
• Ensure that the controller is compatible with the gas
being regulated.
• Check for damage that might have occurred
during shipment.
• Check for and remove any dirt or foreign material that
may have accumulated in the regulator or controller body.
• Ensure that the external or internal sense port is clean.
• When applying pipe sealing compound to piping and
ttings, always apply to external threads.
• Verify that:
- Equipment limits of utilization (PS, TS)
correspond to the desired operating conditions.
- The inlet is protected by an appropriate device(s) to
avoid exceeding the allowable limits (PS, TS).
- The controller and its springs correspond to the desired
operating conditions of associated regulator.
• Connect downstream control line tubing to the 1/4 NPT
connection in the lower casing and to the downstream
pipe respecting a minimum distance of four times its
diameter (see Figure 6).
• Periodically check all vent openings to be sure that they
are not plugged.
REGULATOR SETPOINT,
mbar / psig
CONTROLLER STANDARD SETTINGS
UPSO / Minimum OPSO
(1)(2)
/ Maximum OPSO
(3)
/ Maximum
P
d
< 35 / 0.51 Pd x 0.5 Pd x 2.0 Pd x 2.0 + 10 mbar / 0.145 psig
35 / 0.51 < = P
d
< 60 / 0.87 Pd x 0.5 Pd x 1.7 Pd x 1.7 + 10 mbar / 0.145 psig
60 / 0.87 < = P
d
< 160 / 2.32 Pd x 0.6 Pd x 1.5 Pd x 1.5 + 10 mbar / 0.145 psig
160 / 2.32 < = P
d
< 180 / 2.61 Pd x 0.7 Pd x 1.4 Pd x 1.4 + 10 mbar / 0.145 psig
180 / 2.61 < = P
d
< 300 / 4.35 Pd x 0.7 Pd x 1.4
- - - -
300 / 4.35 < = P
d
Pd x 0.7 Pd x 1.3
The VSX4 Series assembly part number (without valve plug and controller springs): LP: GE35589X012, HP: GE35590X012
The VSX8 Series assembly part number (without valve plug and controller springs): LP: ERCA02667A0, HP: ERCA02668A0
1. Regulator without relief valve (or with relief valve set above controller setting).
2. When selecting OPSO set points, the outlet pressure rating of the regulator should be considered.
3. Regulator with relief valve (set below controller setting).
Table 5. Controller Standard Factory Settings
VSX4 and VSX8 Series
6
Figure 5. Controller External Dimensions
mm / IN.
Figure 6. Typical Installation
P
u
P
d
D
4 x D
(MINIMUM)
REGULATOR
REGULATOR
SENSE LINE
SLAM-SHUT DEVICE
SLAM-SHUT DEVICE
SENSE LINE
RESET TRIP CLEARANCE: 25 / 1
REMOVAL CLEARANCE: 45 / 1.8
SPRING REMOVAL
CLEARANCE 80 / 3.1
146 / 5.8
Ø 118 / 4.6
28 / 1.1
147 / 5.8
VSX4 and VSX8 Series
7
Startup and Shutdown
CAUTION
This Instruction Manual should be used in
conjunction with the instruction manual of
the associated equipment.
Commissioning
!
WARNING
All interventions on the equipment should
only be performed by competent and
trained personnel.
Controller Spring Adjustment
!
WARNING
Before proceeding with the adjustment of
the controller springs, the operator must
ensure upstream and downstream valves are
closed and adjusting screws (keys 43 and 40,
Figure 15) are unscrewed (refer to Table 6).
Overpressure and Underpressure Shutoff
(OPSO/UPSO) Setpoint Adjustment
(Figures 4 and 15)
• Using a athead screwdriver or 1/4 in. drive socket, turn
the OPSO adjusting screw (key 43) clockwise until it
stops turning.
• Apply nominal outlet pressure of the associated regulator
to the downstream system. Refer to Figure 6.
• Reset the controller per the resetting procedure
(refer to the Resetting Procedure section for detailed
resetting instructions).
• Slowly decrease the downstream pressure to the desired
UPSO value (P
dsu
).
• With a screwdriver or 1/4 in. drive socket, turn the UPSO
adjusting screw clockwise (key 40) until the controller trips.
• Apply nominal outlet pressure of the associated regulator
to the downstream system.
• Reset the controller by pulling the reset button (key 30)
until the mechanism is latched.
• Slowly increase the downstream pressure to the desired
OPSO shutoff value (P
dso
).
• With a screwdriver or 1/4 in. drive socket, turn the OPSO
adjusting screw counterclockwise (key 43) until the
controller trips.
Reed Switch
!
WARNING
Do not use the manual button if there is no
plug. This action may damage the magnet
associated with the reed contact if trip the
VSX8 Series.
An optional remote notification switch can be installed
offering the capability to remotely notify the operator should
VSX8 Series shut off occur. Reed switch is available on our
regulators CSB604/704 Series only.
!
WARNING
Do not pull, pinch or carry the VSX8 Series by
the cable of contact reed. Unsuitable handling
of cable can damage the reed contact.
Description and Recommendations
This electrical contact is a limit switch contact based on the
reed contact principle. The actuation takes place through a
permanent magnet. The operation of the electrical contact may
be affected by magnetic materials. Initial commissioning is done
in combination with a signal processing control device. The
operator must check the electrical data for the VSX8 Series
tripping. The reed contacts must be installed in such a way as to
be protected against mechanical hazards as well as prolonged
exposure to sunlight. Specific instructions are available in the
supplier’s instruction manual.
Installation
The contact reed option is available on VSX8 Series mounted in
our factory for a CSB604 and CSB704 Series only. It cannot be
supplied alone for later installation on VSX8 Series on the field.
!
WARNING
The usage of an assembly incorporating
an electrical accessory in an explosive
atmosphere the release relay VSX8 Series
equipped with an electrical accessory (proxy,
microswitch) is:
– is classified “assembly” in conformity
with the ATEX Directive 2014/34/EU (ref
CEN/SFG-I Guidance sheet -February 2015)
– can be installed in any type of classified
zones according to the Directive 1999/92/EC
dated 16 December 1999, according to the
following conditions:
a) the equipment(s) is connected to a
suitable and certified intrinsically safe
apparatus/electric circuit (zener barrier)
Additional electrical data for intrinsic safety
protection use: the encapsulated protection
mode as a single electric device is compatible
with use “ia’’ within following conditions:
Pi max: 3W/VA
U
i
max: 30V AC/DC
Ii max: 200 mA
C = 0.1 nF/m
L = 500 μH/m
b) the equipment is used according to
the appropiate instruction manual
issued by the manufactuer and/or
available on our website
c) when the equipment is used in a natural
gas pressure reducing and/or metering
station in compliance with the following
European standards: EN 12186,
EN 12279 and EN 1776.
VSX4 and VSX8 Series
8
Figure 7. VSX8 Series with Reed Switch
Figure 8. Installation of Reed Switch
APPLY ADHESIVE
(1)
:
1. Adhesives must be selected such that they meet the temperature requirements.
26
107
54
52
TORQUE:
0.7 N•m /
6.2 IN-LBS
TORQUE:
4 TO 8 N•m /
3 TO 6 IN-LBS
30
4a
4e10596A
TORQUE:
0.3 TO 0.55 N•m /
2.7 TO 4.8 IN-LBS
TORQUE:
0.7 N•m /
6.2 IN-LBS
106
1
VSX4 and VSX8 Series
9
Figure 9. Controller Manual Shut-off Button (key 23)
DOWNSTREAM CONTROL
LINE CONNECTION
23
Manual Shut-Off Button Procedure For VSX4 And VSX8 Series
Figure 10. Controller Manual Bypass
47
30
Figure 11. Relatching the Controller Mechanism
30
Figure 12. Repositioning the Reset Button
26
VSX4 and VSX8 Series
10
Figure 14. Controller in Closed (Tripped) Position
Figure 13. Controller in Open (Reset) Position
27
- CLOSE THE UPSTREAM VALVE
- CLOSE THE DOWNSTREAM VALVE
High-Pressure Shutoff Low-Pressure Shutoff
Supply pressure through outlet purge valve. Open the purge valve.
Check the value of the shut-off pressure and for any downstream leakage. Check the value of the shut-off pressure and for any downstream leakage.
Adjust the setpoint, if necessary. Adjust the setpoint, if necessary.
Table 6. Flow Chart for Checking Shut-off Mechanism
Systematic Maintenance is Recommended as Specified Below:
Overpressure Shutoff (OPSO) Setpoint
Adjustment Only (Figures 4 and 15)
• Using a athead screwdriver or 1/4 in. drive socket, turn
the OPSO adjusting screw (key 43) clockwise until it
stops turning.
• Apply nominal outlet pressure of the associated
regulator to the downstream system.
• Reset the controller per the resetting procedure,
(Refer to the Resetting Procedure section for detailed
resetting instructions).
• Slowly increase the downstream pressure to the desired
OPSO value (P
dso
).
• Using a athead screwdriver or 1/4 in. drive socket, turn
the OPSO adjusting screw counterclockwise (key 43)
until the controller trips.
Manual Shut-off Procedure (Figure 9)
Using a screwdriver, press the manual shut-off button
(key 23) to manually trip the controller.
Manual Reset Procedure (Figures 10 to 13)
for VSX4 and VSX8 Series
CAUTION
Equipment installed downstream of the
controller can be damaged if the following
procedure for resetting the controller is
not followed. This equipment includes the
integral controller/regulator congurations.
Note
An OPSO spring must be present and
adjusted before proper reset can be
achieved. If OPSO adjustment has not yet
been made, a FULL adjustment can be used.
Note
Test lockup of the regulator and replace the
regulator valve plug/disks as needed.
Step 1:
• Slowly pull the reset button (key 30) away from the
controller. This slow movement allows for a slow bleed
of the pressure across the controller’s disk and seat
area. The operator should be able to hear the pressure
bleeding through the system.
Step 2:
• When the pressure has equalized and the air bleeding
sound has dissipated, the reset button (key 30) can be
pulled completely away from the controller by hand until
the internal shut-off mechanism has been re-latched.
Step 3:
• Once the operator feels the click of the re-latch occurring,
the reset button (key 30) should be pushed completely
back into its original position.
Trip Indicator (Figures 13 and 14)
The trip indicator (key 27) provides a visual indication
as to whether the controller is opened (latched/reset) or
closed (tripped).
VSX4 and VSX8 Series
11
Controller in Open (Reset) Position
(Figure 13)
When the controller is in the open position, the trip indicator
(key 27) is visible and rm when pressed with a nger.
Controller in Closed (Tripped) Position
(Figure 14)
When the controller is in the closed position, the trip indicator (key 27) is not visible and easily moved when pressed
inward with a nger.
Maintenance
!
WARNING
Only a competent and qualied person may
perform maintenance procedures. If necessary,
contact your local Sales Ofce for assistance.
Failure to test the controller for proper shutoff
can result in a hazardous condition. Test the
controller for operation per applicable federal,
state and local codes, rules and regulations
and Emerson instructions.
Due to normal wear or damage that may occur
from external sources, the controller should
be inspected and maintained periodically.
The frequency of inspection and replacement
depends on the severity of service conditions
and on applicable codes and regulations.
In accordance with applicable National or
Industry codes, standards and regulations/
recommendations, all hazards covered by
specic tests after nal assembly before
applying the CE marking, shall also be
covered after every subsequent reassembly
at installation site, in order to ensure that
the equipment will be safe throughout its
intended life.
Periodic inspection must be performed on the
VSX4 and VSX8 Series. The controller should
be tested for both under and overpressure
shutoff activation and pressure tight shutoff
annually with test intervals not to exceed 15
months but at least once each calendar year.
If the controller does not close at the desired
pressures or leaks gas after closure, repair and/
or replace the controller. For the verication of
internal parts and replacement of worn parts,
the controller should be disassembled every
3 years minimum.
Disassembly and Reassembly
Note
User should only disassemble the controller
to replace the Valve Plug (Disk), change
registration from Internal to External and
Spring and Diaphragm Replacement as
described below.
All other internal disassembly requires
special tooling and should be done only at
the factory; for example the cam and reset pin
assembly (key 4, Figure 15).
!
WARNING
Only parts manufactured by Emerson
should be used for repairing the VSX4 and
VSX8 Series Slam-shut Device.
Valve Plug (Disk) Replacement
!
WARNING
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without rst isolating the
regulator/controller from system pressure
and relieving all internal pressure.
Installation of an incorrect size valve plug
(disk) will prevent the controller from shutting
off the ow of gas in an overpressure or under
pressure scenario resulting in a hazardous
condition. A 39 mm / 1.54 in. diameter valve
plug must be installed in VSX8 Series
controllers for proper operation. VSX4 Series
controllers require the use of the 24 mm /
0.94 in. diameter valve plug.
• Refer to Figure 15 when following this procedure. Remove
the body ange screws (key 34) and the two half anges
(key 36). Remove the controller from the body.
• For VSX4 Series disk replacement, remove the fastening
ring (key 44). For VSX8 Series disk replacement, remove
the travel stop/cotter pin (key 53) and the safety nut (key 58).
For specic tools needed for this step, see Table 7.
• Remove and replace the valve plug (disk) (key 47).
• Replace the fastening ring (key 44) or safety nut (key 58)
and cotter pin (key 53). To replace the safety nut (key 58)
screw the nut onto the plug support until it stops and
then reverse the nut until the cotter pin (key 53) can
be assembled.
• Reassemble in reverse order, taking care to follow the
steps outlined in the General Controller Reassembly
Procedures section.
• Test the controller for proper operation at the desired OPSO
and/or UPSO set points. Readjust set point(s) if needed.
Changing from Internal to
External Registration
!
WARNING
To avoid personal injury or equipment
damage, do not attempt any maintenance
or disassembly without rst isolating the
regulator/controller from system pressure
and relieving all internal pressure.
VSX4 and VSX8 Series
12
TOOL USAGE
Flathead screwdriver and 1/4 in. drive • Adjustment of Overpressure and Underpressure Shutoff (OPSO / UPSO) setting
10 mm / 3/8 in. Wrench
• Removal and installation of the actuator screws (key 16, Figure 15)
• Removal and installation of body ange screws (key 34, Figure 15)
• Removal and installation of the lock nut (key 31, Figure 15)
14 mm / 9/16 in. Wrench • Removal and installation of the external sense line 1/4 NPT connection (Figure 6)
Internal retaining ring pliers • Removal and installation of the VSX4 Series fastening ring (key 44, Figure 15)
Needle Nose Pliers • Removal and installation of Cotter Pin for VSX8 Series
Table 7. Recommended Tools
INDICATION CAUSE ACTION
If the valve will not close Operating fault
Check the following:
• The shut-off pressure settings for high and low pressure values are correct.
• The O-rings are sealing tightly.
• The sensing line is plugged.
Remove the controller and check the following:
• The reset latch is not stuck.
• The state of the diaphragm assembly for wear and tear.
Or contact your local Sales Ofce.
If the downstream pressure in the controller decreases External leak
Locate and seal the leak.
Or contact your local Sales Ofce.
If the outlet pressure in the controller is constant - - - -
• Bleed off the outlet side of the regulator.
• Observe the evolution of the outlet pressure (check tightness).
If the downstream pressure in the controller increases Internal leak
Check the following:
• The valve plug (disk)
• The internal interface O-ring (key 46, Figure 15)
• The reset stem O-ring (key 29, Figure 15)
Or contact your local Sales Ofce.
Table 8. VSX4 and VSX8 Series Troubleshooting
• Refer to Figure 15 when following this procedure.Remove
the body ange screws (key 34) and the two half anges
(key 36). Remove the controller from the body.
• Install the sense blocking screw (key 51) and O- ring
(key 50).
• Remove the 1/4 NPT plug from the 1/4 NPT Control line
port (Figure 6).
• Reassemble in reverse order, ensure to follow the
steps outlined in the General Controller Reassembly
Procedures section.
• Connect a downstream control line with an outer diameter
of 6.4 mm / 0.25 in. or larger to the 1/4 NPT Control line
port shown in Figure 6 and to the downstream system as
indicated in Figure 6.
Spring and Diaphragm Replacement
• Refer to Figure 15 when following this procedure.
Unscrew and remove the closing cap (key 3). Using a
athead screwdriver, unscrew and remove the OPSO
adjusting screw (key 43), OPSO spring (key 41),
maximum washer (key 42).
• Unscrew and remove the UPSO adjusting screw (key 40),
mini washer (key 103) and UPSO spring (key 38).
• Using a 10 mm / 3/8 in. wrench, unscrew and remove
the eight spring case screws (key 16) and associated
nuts (key 12) and then remove the spring case
(key 2). For Type VSX4H or VSX8H, remove the
diaphragm support (key 32).
• To remove the diaphragm assembly, gently grasp the
edge of the diaphragm (key 6) while at the same time
pulling the reset button (key 30) slightly, which will allow
for sliding the back plate (key 5) off of the cam (key 19).
Grasp the back plate (key 5) and unscrew the nut (key 31)
using a 10 mm / 3/8 in. wrench. Remove the diaphragm
plate (key 7) and inspect the diaphragm and replace if
necessary. The lock nut (key 31) should always be replaced.
Reassemble in reverse order, ensure to follow steps
outlined in the following section “General Controller
Reassembly Procedures.” Note that when tightening
the lock nut (key 31) onto screw (key 16), a hexagonal
recess exists at the bottom of the back plate (key 5) that
precludes the screw (key 16) from turning to allow the
lock nut (key 31) to be threaded.
General Controller Reassembly Procedures
• It is recommended that O-rings (keys 14 and 24) be
replaced before reinstalling the controller valve onto the
regulator body.
• Before reassembly, inspect removed O-rings for damage
or wear and replace if necessary.
• Before reassembly, apply silicone grease lubricant to the
appropriate O-rings.
• Using graphite molybdenum, grease appropriate screws,
setting nuts and springs (keys 38, 40, 41, 43 and 103).
• Recommended torque for screws (key 16) is 6.0 N•m /
4.4 ft-lbs.
• Recommended torque for lock nut (key 31) is 3 N•m /
27 in-lbs.
• Recommended torque for the body ange screws
(key 34) is 6 N•m / 4.4 ft-lbs.
Parts Ordering
Controller that have been disassembled for repair must be
tested for proper operation before being returned to service.
The type number, pressure ranges, functional class and
date of manufacture are stamped on the nameplate.
Always provide this information when corresponding with
your local Sales Ofce regarding replacement parts or
technical assistance.
When ordering replacement parts, refer to the key number of
each needed part as found in the parts list.
Separate kits containing all recommended spare parts are
available. See tables on pages 14 and 16.
VSX4 and VSX8 Series
13
Parts List
VSX4 and VSX8 Series Controller
KEY DESCRIPTION QUANTITY
LOW PRESSURE HIGH PRESSURE LOW PRESSURE HIGH PRESSURE
Type VSX4L Type VSX4H Type VSX8L Type VSX8H
1 Lower Case - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2* Upper Case 1 GF01866X012 GF01866X012 GF01866X012 GF01866X012
3* Closing Cap 1 ERAA08178A0 ERAA08178A0 ERAA08178A0 ERAA08178A0
4 Reset pin - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
5 Back plate - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
6* LP/HP Diaphragm 1 ERAA08900A0 ERAA08900A0 ERAA08900A0 ERAA08900A0
7* Diaphragm Plate 1 GF01927X012 GF01944X012 GF01927X012 GF01944X012
8 Safety plug spring - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9* Plug support 1 ERAA08609A0 ERAA08609A0 ERAA08609A0 ERAA08609A0
10 Spring locator - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
12* Nut H M6 8 GE38209X012 GE38209X012 GE38209X012 GE38209X012
13 Ring - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
14* O-ring 51.00x3.00 1 GF03448X012 GF03448X012 GF03448X012 GF03448X012
15 Self-Locking Ring - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
16* Screw H M6x16 9 GE38207X012 GE38207X012 GE38207X012 GE38207X012
18 Axis - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
19 Cam - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
20 Screw M4x8 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
21 Spring, Torsion - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
22 Fastening clip - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
23 Manual Button - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
24* O-ring (5.7x1.9) 2 GF03445X012 GF03445X012 GF03445X012 GF03445X012
25 Relatching Spring - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
26 Gland sleeve - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
27 Indicator Diaphragm - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
28 O-ring R8 (8.90x2.70) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
29 O-ring R1 (2.60x1.90) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
30 Reset button - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
31* Safety nut H M6 1 FA404550X12 FA404550X12 FA404550X12 FA404550X12
32
Diaphragm Support
(Not Shown)
1 - - - - - - - - - - - GF01934X012 - - - - - - - - - - - GF01934X012
38* Spring (Mini) 1 See Table 3 See Table 3 See Table 3 See Table 3
40* Adjustable Screw (Mini) 1 ERAA05947A0 ERAA05947A0 ERAA05947A0 ERAA05947A0
41* Spring (Maxi) 1 See Tables 2 and 3 See Tables 2 and 3 See Tables 2 and 3 See Tables 2 and 3
42* Maxi washer 1 GF01925X012 GF01925X012 GF01925X012 GF01925X012
44* Fastening clip 1 GF04079X012 GF04079X012 - - - - - - - - - - - - - - - - - - - - - -
46* O-ring Pd (54.00x2.00) 1 GF03443X012 GF03443X012 GF03443X012 GF03443X012
47* Safety Plug 1 GF01940X012 GF01940X012 ERAA05852A0 ERAA05852A0
48* Vent 1 27A5516X012 27A5516X012 27A5516X012 27A5516X012
50* O-ring (2.00x1.25) 1 GF03449X012 GF03449X012 GF03449X012 GF03449X012
51* Sense Blocking Screw 1 GF02261X012 GF02261X012 GF02261X012 GF02261X012
53* Cotter Pin 4 - - - - - - - - - - - - - - - - - - - - - - ERAA05924A0 ERAA05924A0
58* Retainer Nut 1 - - - - - - - - - - - - - - - - - - - - - - ERAA05875A0 ERAA05875A0
93 O-ring R8 (10.82x1.78) - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
96 Nut M2.5X0.45 - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
102 Ring Guide - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
103* Washer 1 ERAA05957A0 ERAA05957A0 ERAA05957A0 ERAA05957A0
104* Maxi Seat 1 ERAA05956A0 ERAA05956A0 ERAA05956A0 ERAA05956A0
1. When adjusting the controller, refer to the Controller Spring Range tables, Tables 2 and 3, to ensure the desired set value is achievable for the controller construction.
*Recommended Spare Part
VSX4 and VSX8 Series
14
3
14
16
31
5
16
21
51
15
53
10
19
2
24
9
58
47
1
33
40
80
38
41
104
102
48
42
7
6
12
29
27
96
30
93 26
18
13
28
28
29
846
4
103
L2
L2
L2
43
L1
L1
L1
L1
50
VSX8 SERIES
TORQUE:
1 TO 3 N•m /
9 TO 26 IN-LBS
TORQUE:
3 N•m /
27 IN-LBS
TORQUE:
5.7 TO 6.2 N•m /
50 TO 55 IN-LBS
TORQUE:
0.3 TO 0.55 N•m /
2.7 TO 4.8 IN-LBS
ERCA02667
APPLY LUBRICANT
(1)
:
L1 = MULTI-PURPOSE PTFE LUBRICANT
L2 = ANTI-SEIZE LUBRICANT
1. Lubricants must be selected such that they meet the temperature requirements.
TORQUE:
0.3 TO 0.55 N•m /
2.7 TO 4.9 IN-LBS
13 8
1
28
29
47
44
9
10
15
VSX4 SERIES
MANUAL BUTTON
23
24
25
22
20
21
Figure 15. Controller Assembly
VSX4 and VSX8 Series
15
VSX4 AND VSX8 SERIES KIT
Key Quantity Code Description
Part Number
Type VSX4L/VSX8L Type VSX4H/VSX8H
Modication Kit to Change from Internal to External Sense
50 1
197898
Sense blocking O-ring (2.00 x 1.25) (for external only) GF03449X012
51 1 Sense blocking screw (for external only) GF02261X012
Diaphragm Replacement Kit
6 1
197899
Diaphragm GF01929X012
31 1 Lock nut FA404550X12
Modication Kit to Change from Low Pressure to High Pressure Construction
7 1
197900
Diaphragm plate - - - - - - - - - - - GF01944X012
32 1 Diaphragm support - - - - - - - - - - - GF01934X012
14 1 Closing cap O-ring GF03448X012
31 1 Lock nut FA404550X12
+ spring according to setpoint -- not included in the kit
Modication Kit to Change from High Pressure to Low Pressure Construction
7 1
197901
Diaphragm plate GF01927X012 - - - - - - - - - - -
14 1 Closing cap O-ring GF03448X012
31 1 Lock nut FA404550X12
+ spring according to setpoint -- not included in the kit
VSX4 Series Repair Kit
6 1
RVSX4MCX012
Diaphragm GF01929X012
14 1 Closing cap O-ring GF03448X012
24 1 Diaphragm Assembly O-ring GF03445X012
31 1 Lock nut FA404550X12
33 1 Inlet O-ring GF03442X012
46 1 Outlet O-ring GF03443X012
47 1 Medium Capacity Disk GF01940X012
VSX8 Series Repair Kit
6 1
RVSX8X00012
Diaphragm GF01929X012
14 1 Closing cap O-ring GF03448X012
24 1 Diaphragm Assembly O-ring GF03445X012
31 1 Lock nut FA404550X12
33 1 Inlet O-ring GF03442X012
46 1 Outlet O-ring GF03443X012
47 1 High Capacity Disk ERAA05852A0
53 1 Cotter Pin ERAA05924A0
Parts List (continued)
VSX4 and VSX8 Series
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