Emerson Fisher OS2, Fisher OSD2 Instruction Manual
Instruction Manual
D102778X012
April 2018
Type OS2 Slam-Shut Device
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™ slam-shut devices 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 slam-shut device 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.
Call a gas service person to service the
unit. Only a qualified person must install or
service the slam-shut devices.
TYPE E
VALVE
BODY
W8133
TYPE OSE
Type OS2
TYPE OS2
SLAM-SHUT
DEVICE
Introduction
Scope of the Manual
This instruction manual provides installation, maintenance
and parts ordering information for the Types OS2 and OSD2
slam-shut devices. The Type OS2 slam-shut device is used
on Type OSE with NPS 1 through 6 / DN 25 through 150
body sizes, while Type OSD2 is used on NPS 8 and 10 /
DN 200 and 250 body sizes.
For more information on Type OS2 installed on other
regulators such as Types EZHOSX, EZHSO-OSX,
EZLOSX and EZROSX, refer to the instruction manuals of
these products.
Description
Slam-shut devices are used to totally and rapidly cut off
gas flow when the inlet and/or outlet pressure in the system
either exceeds or drops below the setpoints. The Type OSE
consists of a valve, mechanism box (BM1 or BM2) and either
one or two modular sensing elements called manometric
devices (Type BMS1 or BMS2) (see Figure 2). All information
for the Type OSE (which includes a Type OS2 slam-shut
device and a Type E valve body) is contained in this
Instruction Manual.
TYPE EZR
REGULATOR
W8136
TYPE EZROSX
Figure 1. Type OS2 Slam-Shut Device on
Types OSE and EZROSX Constructions
TYPE OS2
SLAM-SHUT
DEVICE
North America Only
Type OS2
Specifications
This section lists the specifications for the Type OS2 slam-shut valve. Factory specifications are stamped on the nameplate
fastened on the valve at the factory.
Body Sizes and End Connection Styles
Type OSE
WCC Steel
1 and 2 NPT; NPS 1, 2, 3, 4 and 6 /
DN 25, 50, 80, 100 and 150
CL150 RF, CL300 RF or CL600 RF
LCC Steel
NPS 8 and 10 / DN 200 and 250
CL150 RF, CL300 RF or CL600 RF
Cast Iron
1 and 2 NPT; NPS 1, 2, 3, 4 and 6 /
DN 25, 50, 80, 100 and 150
CL125 FF or CL250 RF
Types EZHOSX and EZHSO-OSX
LCC Steel
NPS 1, 2, 3 and 4 / DN 25, 50, 80 and 100
CL150 RF, CL300 RF or CL600 RF
Type EZLOSX
LCC Steel
NPS 2, 3 and 4 / DN 50, 80 and 100
CL150 RF, CL300 RF or CL600 RF
Type EZROSX
LCC Steel
NPS 1, 2, 3, 4 and 6 / DN 25, 50, 80, 100
and 150 CL150 RF, CL300 RF or CL600 RF
Maximum Inlet Pressure
(1)(2)
1470 psig / 101 bar or maximum body rating,
whichever is lower
Maximum Set Pressure
1470 psig / 101 bar or maximum body rating,
whichever is lower
Minimum Set Pressure
4.02 in. w.c. / 10 mbar
Outlet Pressure Ranges
See Table 2
Maximum Flowing Pressure Differential
BODY SIZE
NPS DN psig bar
1 25 360 24.8
2 50 360 24.8
3 80 360 24.8
4 100 150 10.3
6 150 85 5.9
8 200 119 8.2
10 250 67 4.6
MAXIMUM FLOWING
PRESSURE DIFFERENCE
(3)
Process Temperature Capabilities
(2)
-22 to 180°F / -30 to 82°C
Accuracy
+/-2.5% for set pressures at or below 1.45 psig / 0.1 bar
or +/-1% for set pressures above 1.45 psig / 0.1 bar,
+/-5% for the piston Types 27 and 17
Maximum Shutoff Pressure Differential
1470 psig / 101 bar or maximum body rating,
whichever is lower
Pressure Sensing Connections
1/4 NPT
Response Time
<1 second
Pressure Registration
External
Valve Plug Travel and Stem Diameter
BODY SIZE VALVE PLUG TRAVEL
NPS DN In. mm In. mm
1 25 1/2 13
2 50 1/2 13
3 80 1-1/8 29
4 100 2 51
6 150 2 51
8 200 2-3/4 70
10 250 3-1/4 82
VALVE PLUG STEM
DIAMETER
0.138 3.5
0.276 7.0
Approximate Weights
BODY SIZE APPROXIMATE WEIGHT
NPS DN lbs kg
1 25 36 16
2 50 70 32
3 80 121 55
(2)
4 100 216 98
6 150 445 202
8 200 785 356
10 250 1272 577
North America Only
Options
• Explosion-proof limit switch
• Additional manometric device for extra
pressure sensing
• Manual Push Button Trigger Switch
(4)
1. Relief pressure plus maximum allowable buildup over setting.
2. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.
3.EndconnectionsforotherthanASMEstandardcanusuallybeprovided.ContactyourlocalSalesOfceforassistance.
4. The push button connects at the same Type BM2 port as a Type BMS2.
2
Type OS2
BM2
(TYPES BMS1 AND BMS2)
TYPE BMS1
(RIGHT SIDE)
TYPE OS2
BM1
E0564
MECHANISM BOX (BM1) WITH 1 MANOMETRIC
SENSING DEVICE (TYPE BMS1)
TYPE BMS1
TYPE BMS2
(LEFT SIDE)
E0565
MECHANISM BOX (BM2) WITH 2 MANOMETRIC SENSING DEVICES
TOP-MOUNTED (STAND-ALONE TYPE OSE VALVE)
Figure 2. Types of Installation (Mounting on Horizontal Pipeline Only)
Table 1. Applications and Construction Guide (See Figure 2)
APPLICATION MECHANISM BOX REQUIRED MANOMETRIC SENSING DEVICE REQUIRED
Overpressure Shutoff (OPSO)
Underpressure Shutoff (UPSO) BMS1 - - - -
Overpressure Shutoff (OPSO) and Underpressure Shutoff (UPSO) BMS1
Overpressure Shutoff (OPSO) and Underpressure Shutoff (UPSO)
Overpressure Shutoff (OPSO), Overpressure Shutoff (OPSO) and
1. When using one manometric sensing device for both overpressure and underpressure shutoff, make sure that the difference between set pressures falls within the maximum range
shown in Table 2.
2. When using two manometric sensing devices (Types BMS1 and BMS2), the Type BMS1 can only be used for high trip.
Underpressure Shutoff (UPSO)
BM1
BM2
BMS1 - - - -
BMS1
BMS1
(1)
(2)
(2)
- - - -
BMS2
BMS2
(1)
North America Only
Type EZROSX (see Figure 1) is a combination of the
Type EZR regulator and the Type OS2 slam-shut device.
For installation, maintenance and parts information on
the Type EZR portion, refer to Type EZR Instruction
Manual D102600X012.
Type EZHOSX is a combination of the Type EZH regulator
and the Type OS2 slam-shut device. Details related to
installation, maintenance and parts information are listed in
the Type EZH Instruction Manual D103077X012.
Type EZLOSX is a combination of the Type EZL regulator
and the Type OS2 slam-shut device. Details related to
installation, maintenance and parts information are listed in
the Type EZL Instruction Manual D103091X012.
Incorporated in the Type OS2 (up to NPS 6 / DN 150 body
size) valve plug is an automatic internal bypass valve
mechanism, which balances pressures on both sides of the
plug when resetting. Type OSD2 will be used for NPS 8 and
10 / DN 200 and 250 Type OSE slam-shut valves; in this
case the bypass is not internal but external.
The Types OS2 and OSD2 slam-shut devices can be used
for all pressure ranges from 4.02 in. w.c. to 1470 psig /
10 mbar to 101 bar by simply replacing the manometric
sensing device. The Type OS2 can be configured for
OverPressure ShutOff (OPSO), UnderPressure ShutOff
(UPSO), OverPressure Shutoff and UnderPressure ShutOff
(OPSO/UPSO), manual shutoff or remote shutoff.
Mechanism Box (BM1 or BM2)
The mechanism box (BM1 or BM2, see Figure 2) is designed
to close the slam-shut valve. The detection of pressure
variances is sensed by a double-stage trip mechanism (see
Figure 7). The first stage is the detection stage and will only
trip when the system pressure reaches the set pressure of
the manometric sensing device. The second stage is the
power stage and once tripped by the first stage, the closing
spring causes the valve plug to slam-shut and remain
closed until the valve is manually reset. If there are any inlet
pressure variances or vibrations subjected to the second
stage components, they are not transmitted to the first stage
trip mechanism. This unique double-stage trip mechanism
virtually eliminates nuisance tripping commonly found in
other shutoff devices.
3
Type OS2
Table 2. Spring Ranges, Part Numbers and Maximum and Minimum Pressures for the Manometric Sensing Devices (Types BMS1 and BMS2)
SPRING RANGE
4.02 to 14.1 in. w.c. /
10 to 35 mbar
9.97 to 33.2 in. w.c. /
25 to 83 mbar
18 in. w.c. to 2.0 psig /
45 mbar to 0.14 bar
1.0 to 3.5 psig /
70 mbar to 0.24 bar
1.7 to 5.6 psig /
0.12 to 0.39 bar
2 to 11 psig /
0.14 to 0.76 bar
4 to 19 psig / 0.28 to 1.3 bar Brown FA113202X12 1.16 / 80 mbar 8.70 / 0.60
7 to 33 psig / 0.48 to 2.3 bar Black FA114139X12 2.47 / 0.17 16.0 / 1.1
15 to 75 psig / 1.0 to 5.2 bar Blue FA113200X12
31 to 161 psig / 2.1 to 11.1 bar Brown FA113202X12 10.2 / 0.70 79.8 / 5.5
59 to 235 psig / 4.1 to 16.2 bar Black FA114139X12 23.2 / 1.6 145 / 10.0
235 to 323 psig / 16.2 to 22.3 bar Brown FA113202X12
323 to 588 psig / 22.3 to 40.5 bar Black FA114139X12 94.3 / 6.5
588 to 808 psig / 40.5 to 55.7 bar Brown FA113202X12
808 to 1470 psig / 55.7 to 101 bar Black FA114139X12 174 / 12.0
81 to 323 psig / 5.60 to 22.3 bar Brown FA113202X12
122 to 514 psig / 8.41 to 35.4 bar Black FA114139X12 36.3 / 2.5 290 / 20.0
257 to 1058 psig / 17.7 to 73.0 bar Gray FA113201X12 315 1058 / 73.0 72.5 / 5.0 479 / 33.0
1. Minimum suggested difference between slam-shut set pressure and normal operating pressure of the system.
2. Maximum difference between overpressure and underpressure when using one manometric device (Type BMS1) with tripping hook (see Figure 5). For underpressure and overpressure
points greater than this maximum number, use a second manometric device (Type BMS2) for underpressure protection.
SPRING
COLOR
Purple FA113195X12
Orange FA113196X12
Red FA113197X12
Yellow FA113198X12
Green FA113199X12
Gray FA113201X12
SPRING PART
NUMBER
MANOMETRIC
SENSING
DEVICE TYPE
162
71 235 / 16.2
27
17 1470 / 101
236
MANOMETRIC
SENSING
DEVICE STYLE
Diaphragm
Piston
Bellows
MAXIMUM
SENSING INLET
PRESSURE,
psig / bar
74 / 5.1
1470 / 101
514 / 35.4
SETPOINT
TOLERANCE,
psig / bar
1.61 in. w.c. /
4 mbar
2.02 in. w.c. /
5 mbar
4.02 in. w.c. /
10 mbar
5.62 in. w.c. /
14 mbar
7.23 in. w.c. /
18 mbar
20.1 in. w.c. /
50 mbar
5.08 / 0.35 36.3 / 2.5
43.5 / 3.0
102 / 7.0
14.5 / 1.00 145 / 10.0
MAXIMUM DIFFERENCE
OVERPRESSURE AND
(1)
UNDERPRESSURE,
BETWEEN
(2)
psig / bar
4.02 in. w.c. /
10 mbar
10 in. w.c. /
25 mbar
20.1 in. w.c. /
50 mbar
24.1 in. w.c. /
60 mbar
2.18 / 0.15
5.08 / 0.35
Requires use
of Type BMS1
or BMS2
Manometric Sensing Device (Type BMS1
or BMS2) (See Figure 2)
Pressure from the system is sensed through control lines
into the manometric sensing device (Type BMS1, BMS2 or
Types BMS1 and BMS2). Depending on the configuration,
the Type BMS1 or BMS2 will transmit these pressure
fluctuations to the mechanism box. If these fluctuations
reach the setpoint of the manometric sensing device
(Type BMS1 or BMS2), the device will activate the tripping
mechanism in the mechanism box (Type BM1 or BM2) and
cause the valve to slam-shut.
Remote Shutoff
Remote Tripping is accomplished using a 3-way solenoid
valve installed in the control line of a Type BMS1 or
BMS2 manometric device configured for underpressure
protection (UPSO) or overpressure and underpressure
protection (OPSO/UPSO). When de-energized, the solenoid
valve allows the Type BMS manometric device to monitor
the controlled pressure as if the solenoid valve was not
present. When energized, the solenoid valve will be
repositioned to connect the Type BMS manometric device to
atmospheric pressure tripping the underpressure protection
slam-shut setting.
*For further instructions on Types EZR, EZH and EZL, refer to the corresponding instruction manual of these products.
Principle of Operation* (See Figure 3)
The Type OSE slam-shut valve and the Type OS2 slam-shut
device used on Type EZHOSX, EZROSX or EZLOSX
provides overpressure and/or underpressure protection
by shutting off the flow to the downstream system. The
slam-shut valve is typically installed upstream of a pressure
reducing regulator as shown in Figure 4.
Pressure is registered on one side of the diaphragm, piston
or bellows and is opposed by the setpoint control spring of
the manometric sensing device. The Type OS2 slam-shut
device tripping pressure is determined by the setting of the
control spring.
Overpressure: when the sensed pressure increases
above the setpoint, the pressure on top of the diaphragm
overcomes the spring setting and moves the manometric
device stem.
Underpressure: when the sensed pressure decreases
below the setpoint, the control spring pressure below the
diaphragm overcomes the downstream pressure and pushes
the diaphragm which moves the manometric device stem.
When the sensed pressure rises above the set pressure (or
drops below the set pressure) the manometric device senses
the pressure change and triggers the detection stage which
North America Only
4
TYPE
EVENT
50 mm
35 mm
15 mm
COURSE CLAPET
2
R
U
N
S
T
A
R
T
4
6
8
E0559
PRX
S
L
A
EQUALIZER BYPASS
MANOMETRIC DEVICE STEM
Type OS2
TYPE
SA/2
R
B
V
M
E0939
INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
PILOT SUPPLY PRESSURE
MANOMETRIC DEVICE
R
U
N
2
4
6
S
T
8
A
R
T
TYPE EZHOSX
COURSE CLAPET
50 mm
35 mm
15 mm
VALVE PLUG
VALVE PLUG DISK
EVENT
MECHANISM BOX
MANOMETRIC DEVICE STEM
North America Only
E0559
INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
TYPE EZROSX TYPE OSE
E0558
INLET PRESSURE
OUTLET PRESSURE
Figure 3. Operational Schematics
5
Type OS2
UPSTREAM
BLOCK VALVE
TYPE OSE
SLAM-SHUT VALVE
E0560
OVERPRESSURE AND UNDERPRESSURE SHUTOFF
UPSTREAM
BLOCK
VALV E
DOWNSTREAM SENSING LINE
OPTIONAL STRAINER
USING ONE MANOMETRIC DEVICE
DOWNSTREAM SENSING LINE
OPTIONAL STRAINER
BLOCK
VALV E
PRESSURE
REGULATOR
BLOCK
VALV E
UPSTREAM
BLOCK VALVE
TYPE OSE
SLAM-SHUT VALVE
E0561
OPTIONAL
STRAINER
UPSTREAM
BLOCK
VALV E
DOWNSTREAM SENSING LINE
OPTIONAL STRAINER
MINIMUM/MAXIMUM UPSTREAM AND
DOWNSTREAM PRESSURE
DOWNSTREAM SENSING LINE
EXTERNAL TRIP
PRESSURE
BLOCK
VALV E
PRESSURE
REGULATOR
BLOCK
VALV E
TYPE OSE
SLAM-SHUT VALVE
E0562
OVERPRESSURE AND UNDERPRESSURE SHUTOFF
USING TWO MANOMETRIC DEVICES
PRESSURE
REGULATOR
Figure 4. Typical Installations
activates the second stage, releasing the slam-shut valve
plug. A tight and total shutoff is ensured by the plug seal
O-ring closing on the orifice and is helped by the “dash pot”
effect between the bonnet skirt and the valve plug. A “dash
pot” effect occurs when the valve plug closes by having both
the closing spring and the inlet pressure pushing on top of
the valve plug. This is accomplished by ports around the skirt
of the bonnet allowing inlet pressure above the valve plug.
Installation*
WARNING
!
Personal injury, equipment damage or
leakage due to escaping gas or bursting
of pressure-containing parts may result
if the slam-shut valve is installed where
its capabilities can be exceeded or where
TYPE OSE
SLAM-SHUT VALVE
E0563
EXTERNAL SIGNAL
PRESSURE
REGULATOR
conditions exceed any ratings of the adjacent
piping or piping connections. To avoid this,
install the slam-shut valve where service
conditions are within unit capabilities and
applicable codes, regulations or standards.
Additionally, physical damage to the
slam-shut valve could break the mechanism
box off the main valve, causing personal
injury and property damage due to escaping
gas. To avoid such injury or damage, install
the unit in a safe location.
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. Use qualified personnel when
installing, operating and maintaining the unit.
North America Only
*For further instructions on Types EZR, EZH and EZL, refer to the corresponding instruction manual of these products.
6
Type OS2
Table 3. Main Valve Body Sizes, End Connection Styles and Body Pressure Ratings
MAIN VALVE BODY SIZE
NPS DN psig bar
1
2
3
4
6
1
2
3
4
6
8
10
1.RatingsandendconnectionsforotherthanASMEstandardcanusuallybeprovided.ContactyourlocalSalesOfceforassistance.
2.SeeSpecicationsandTable2foradditionalpressureratings.
3. Available with NPS 1 and 2 / DN 25 and 50 only.
25
50
80
100
150
25
50
80
100
150
200
250
MAIN VALVE BODY MATERIAL END CONNECTION STYLE
(3)
NPT
Cast iron
WCC Steel
LCC Steel
CL125 FF 200 13.8
CL250 RF 500 34.5
(3)
NPT
CL150 RF 290 20.0
CL300 RF 750 51.7
CL600 RF 1500 103
CL150 RF 290 20.0
CL300 RF 750 51.7
CL600 RF 1500 103
(1)
STRUCTURAL DESIGN RATING
400 27.6
1500 103
(2)
Clean out all pipelines before installation and check to be
sure the valve has not been damaged or collected foreign
material during shipment. Use suitable line gaskets and
good bolting practices with a flanged body. The Type OSE
must be installed in a horizontal position with the mechanism
box above the body (see Figure 2). The Types EZHOSX,
EZROSX and EZLOSX are installed with the mechanism
box typically below the pipe. Type OS2 slam-shut device can
also be installed in a pit that is subject to flooding by venting
the mechanism box above the maximum possible flood
level. When used below ground, the vent must be relocated
(piped) to keep the mechanism box from collecting moisture
and/or other foreign material. Install obstruction-free tubing
or piping into the 1/4 NPT vent tapping. Provide protection
on the relocated vent by installing a screened vent cap into
the end of the vent pipe.
Type OS2 can be used along with a token relief valve to
minimize unnecessary shutoff. The relief valve is set to
open before the Type OS2 slam-shut device activates.
This arrangement allows the relief valve to handle minor
overpressure problems such as gas thermal expansion or
seat leakage due to dirt moving through the system which
may move out of the regulator during the next operating
cycle. The slam-shut device does activate if the regulator
has a major malfunction with excessive gas flow that
exceeds the token relief capacity.
The manometric device requires an external sensing line
which should be tapped into a straight run of pipe 8 to
10 pipe diameters downstream or upstream of the slam-shut
device. If impossible to comply with this recommendation
due to the pipe arrangement, it may be better to position
the sensing line tap nearer the regulator or slam-shut outlet
rather than downstream of a block valve. Do not position
the tap near any elbow, swage or nipple which might cause
turbulence. It is recommended to install an isolation valve
and a vent valve on the sensing line, which can be useful for
tripping and verifications.
Startup*
WARNING
!
To avoid personal injury or property
damage due to explosion or damage to
regulator or downstream components during
startup, release downstream pressure to
prevent an overpressure condition on the
diaphragm of the regulator. In order to avoid
an overpressure condition and possible
equipment damage, pressure gauges
should always be used to monitor pressures
during startup.
These startup procedures are for the Type OSE/OS2 only.
1. Make sure the upstream and downstream shutoff valves
are closed.
2. Slowly open the upstream shutoff valve.
3. For NPS 8 and 10 / DN 200 and 250 body sizes, slowly
open the bypass valve.
4. The slam-shut valve is shipped with the slam-shut
device in the tripped position. To reset the slam-shut,
follow the procedure under Resetting the Trip
Mechanism in the Adjustment section.
5. For NPS 8 and 10 / DN 200 and 250 body sizes, close
the slam-shut valve bypass.
6. Slowly open the downstream shutoff valve.
7. Check all connections for leaks.
8. Adjust the slam-shut pressure setting by following the
appropriate procedures in the Adjustment section.
North America Only
*For further instructions on Types EZR, EZH and EZL, refer to the corresponding instruction manual of these products.
7
Type OS2
Adjustment
Typically, adjustments are carried out with the slam-shut
valve closed. Only the detection stage is reset (see Figure 7
and the section on Resetting the Tripping Mechanism).
Follow the procedures below for setpoint adjustment and use
the resetting tool (see Figure 8) to move the adjusting screw.
CAUTION
Before any adjustment, check that the
spring range installed corresponds to the
required setpoint.
CAUTION
Before beginning adjustment procedures, be
sure there is no pressure in the manometric
sensing device (Type BMS1 or BMS2).
Type BMS1 (Figure 5)
Overpressure Shutoff Only
Adjusting the Threaded Stem:
1. Remove the tripping hook or rotate so it cannot contact
Pin D2.
2. Turn in the adjusting screw until the distance between
the threaded stem and Pin D1 stops increasing.
3. Reset the detection stage only. (See Figure 7 and the
section on Resetting the Trip Mechanism.)
4. Adjust the threaded stem to a distance of 1/16 in. /
1.6 mm from Pin D1 (detection stage set).
5. Tighten threaded stem locknut.
Adjusting the Overpressure Trip Point:
1. Pressurize the Type BMS1 to the desired trip pressure.
2. Turn in the adjusting screw until the detection stage can
be reset.
3. Turn out the adjusting screw until the detection
stage trips.
4. Verify that the trip pressure is equal to the desired
pressure setting by reducing pressure to the
Type BMS1, resetting the detection stage and then
increasing pressure to the Type BMS1 until the detection
stage trips. Adjust trip pressure setting if necessary.
5. Tighten adjusting screw locknut.
Underpressure Shutoff Only
Adjusting the Threaded Stem and Tripping Hook:
1. Rotate the tripping hook so that it cannot contact Pin D2.
2. Turn out the adjusting screw.
3. Pressurize the Type BMS1 to the desired trip pressure.
ADJUSTING SCREW
LOCKNUT
ADJUSTING
SCREW
TRIPPING HOOK
LOCKNUTS
E0606
TRIPPING HOOK
PIN D2
TRIPPING
PLATE
PIN D1
Figure 5. Type BMS1 Construction
THREADED
STEM
THREADED STEM
LOCKNUT
OVERPRESSURE SHUTOFF
4. Reset the detection stage only. (See Figure 7 and the
section on Resetting the Trip Mechanism)
5. Adjust the threaded stem to a distance of
1/16 in. / 1.6 mm from Pin D1 (detection stage set).
6. Tighten threaded stem locknut.
7. Rotate the tripping hook into position and adjust the
tripping hook locknuts until the hook is at a distance of
1/16 in. / 1.6 mm from Pin D2.
8. Tighten tripping hook locknuts.
Adjusting the Underpressure Trip Point:
1. Maintain the desired trip pressure in Type BMS1.
2. Turn in the adjusting screw until the detection stage
is tripped.
3. Verify that the trip pressure is equal to the desired
pressure setting by increasing pressure to the
Type BMS1, resetting the detection stage and then
reducing pressure to the Type BMS1 until the detection
stage trips. Adjust trip pressure setting if necessary.
4. Tighten adjusting screw locknut.
Overpressure and Underpressure Shutoff
Adjusting the Threaded Stem:
1. Rotate the tripping hook so that it cannot contact Pin D2.
2. Turn out the adjusting screw.
3. Pressurize the Type BMS1 to the desired overpressure
trip pressure.
4. Reset the detection stage only. (See Figure 7 and the
section on Resetting the Trip Mechanism.)
5. Adjust the threaded stem until it just touches Pin D1.
6. Manually trip the detection stage by moving Pin D1.
7. Unscrew the threaded stem two turns which is a
distance of approximately 1/16 in. / 1.6 mm.
8. Tighten threaded stem locknut.
North America Only
8
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