Instruction ManualForm 5668

Type OS2

03/01

Type OS2 Slam-Shut Device
Introduction
TYPE OS2
SLAM-SHUT
DEVICE

Scope of ManualThis instruction manual provides installation, maintenance, and parts information for the Type OS2 slamshut device used on the Type EZROSX and the TypeOSE.

Description
The purpose of the Type OSE/EZROSX slam-shut
device is to totally and rapidly cut the flow of gas when
the inlet and/or outlet pressure in the system either
exceeds or drops below setpoints. The Type OS2
consists of a valve, mechanism box (BM1 or BM2) andeither one or two modular sensing elements called
manometric devices (BMS1 or BMS2) (see figure 2).

TYPE E
VALVE
BODY

W8133

TYPE OSE

Type EZROSX (see figure 1) is a combination of theType 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 Form 5468. All information for the Type OSE(which includes a Type OS2 slam-shut device and aType E valve body) is contained in this instruction
manual.
The detection of pressure variances is sensed by adouble stage trip mechanism (see figure 7). The firststage is the detection stage and will only trip when thesystem pressure reaches the set pressure of the
manometric sensing device. The second stage is thepower stage and once tripped by the first stage, theclosing spring causes the valve plug to slam-shut andremains 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.

TYPE EZRREGULATORTYPE OS2
SLAM-SHUT
DEVICE

W8136

Incorporated in the Type OS2 valve plug is an automatic internal bypass valve mechanism, which balFigure 1. Type OS2

D102778X012

continued on page 4

TYPE EZROSXRegulators

www.FISHERregulators.com

Type OS2
Specifications
Body Sizes and End Connection Styles
Type OSEWCB Steel
1 and 2-inch (DN 25 and 50) NPT screwed; 1, 2,
3, 4, and 6-inch (DN 25, 50, 80, 100, and 150)ANSI Class 150 RF, 300 RF, or 600 RF
Cast Iron
1 and 2-inch (DN 25 and 50) NPT screwed; 1, 2,
3, 4, and 6-inch (DN 25, 50, 80, 100, and 150)ANSI Class 125 FF or 250 RF
Type EZROSXWCB Steel
1, 2, 3, 4, and 6-inch (DN 25, 50, 80, 100, and150) ANSI Class 150 RF, 300 RF, or 600 RF

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 (100 bar) or maximum body rating,whichever is lower.
Pressure Registration
External
Valve Plug Travel and Stem Diameter

Maximum Inlet Pressure(1)(2)1470 psig (100 bar) or maximum body rating,whichever is lower.

BODY SIZE,INCHES (DN)

VALVE PLUG TRAVEL,VALVE PLUG STEMINCHES (mm)DIAMETER, INCHES (mm)2 (50)

1/2 (15)

Maximum Set Pressure1470 psig (100 bar) or maximum body rating,whichever is lower.

3 (80)

1-1/8 (30)

4 (100)2 (50)

6 (150)2 (50)

1 (25)

Minimum Set Pressure
4.02-inches w.c. (10 mbar)

1/2 (15)0.138 (3,5)

Approximate Weight

Outlet Pressure Ranges
See table 2

BODY SIZE, INCHES (DN)

APPROXIMATE WEIGHT, POUNDS (kg)1 (25)

Maximum Temperature Capabilities(2)–20° to 150°F (–29° to 65°C)
Maximum Flowing Pressure Differential
BODY SIZE,INCHES (DN)

MAXIMUM FLOWING PRESSURE DROPS,PSIG (bar)

1 (25)

360 (25)

2 (50)

360 (25)

3 (80)

360 (25)

4 (100)150 (10)

6 (150)85 (6)

36(16)

2 (50)

70(32)

3 (80)

121 (55)

4 (100)216(98)

6 (150)

445

(202)

Options• Explosion-proof switch• Non-explosion-proof limit switch• Solenoid• Additional manometric device for extra pressure
sensing

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.

Table 1. Applications and Construction Guide (See Figure 2)
APPLICATION
Overpressure Shutoff (OPSO)MECHANISM BOX REQUIREDMANOMETRIC SENSING DEVICE REQUIRED

BM1

BM2

BMS1

BMS2

Yes

No

Yes

No
No

Underpressure Shutoff (UPSO)

Yes

No

Yes

Overpressure Shutoff (OPSO) and Underpressure Shutoff (UPSO)

Yes

No

Yes( 1 )No

Overpressure Shutoff (OPSO) and Underpressure Shutoff (UPSO)

No

Yes

Yes( 2 )YesOverpressure Shutoff (OPSO), Overpressure Shutoff (OPSO) and
Underpressure Shutoff (UPSO)

No

Yes

Yes( 2 )Yes( 1 )1. When using one manometric sensing device (BMS1 or BMS2) 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 (BMS1 and a BMS2), the BMS1 can only be used for high trip.

2

Type OS2
Table 2. Spring Ranges, Part Numbers, and Maximum and Minimum Pressures for the Manometric Sensing Devices (BMS1 and BMS2)SPRING RANGE, PSIG (bar)SPRINGCOLORSPRINGPARTNUMBER

MAXIMUM
MAXIMUM
MANOMETRICSENSING MANOMETRICSETPOINT
DIFFERENCESENSINGINLETSENSINGTOLERANCE,BETWEENDEVICEPRESSURE, DEVICE TYPEPSIG (bar)( 1 ) OVERPRESSURE AND
STYLEPSIG (bar)
UNDERPRESSURE( 2 )4.02 to 14.1(10 to 35 mbar)
inches w.c.

Purple T14232T0012

0.058 (0,004)

0.145 (0,010)

9.97 to 33.2(25 to 80 mbar)
inches w.c.

Orange T14233T0012

0.073 (0,005)

0.363 (0,025)

0.145 (0,010)

0.725 (0,050)

0.203 (0,014)

0.870 (0,060)

18-inches w.c.
(45 mbar to 0,140 bar)
to 2.0 psig

Red

T14234T0012

1.0 to 3.5(0,070 to 0,240)

Yellow

1.7 to 5.6(0,115 to 0,380)

Green T14236T0012

75 (5)

T14235T0012

162

0.261 (0,018)

2.18 (0,150)

2 to 11 (0,140 to 0,750)

Gray

T14238T0012

0.725 (0,050)

5.08 (0,350)

4 to 19(0,250 to 1,3)

Brown T14239T0012

1.16 (0,080)

8.70 (0,600)

7 to 33(0,450 to 2,3)Black

T14240T0012

2.47 (0,170)

16.0 (1,10)

15 to 75

(1,0 to 5,1)

Blue

T14237T0012

5.08 (0,350)

36.3 (2,50)

10.2 (0,700)

79.8 (5,50)
145 (10,0)Diaphragm

235 (16)71

31 to 161 (2,1 to 11,0)

Brown T14239T0012

59 to 235

(4,0 to 16,0)Black

T14240T0012

23.2 (1,60)

235 to 323(16,0 to 22,0)

Brown T14239T0012

43.5 (3,00)

323 to 588(22,0 to 40,0)Black

588 to 808(40,0 to 55,0)

Brown T14239T0012

808 to 1470

(55,0 to 100,0)Black

81 to 323

(5,5 to 22,0)

Brown T14239T0012

122 to 514(8,3 to 35,0)Black

T14240T0012

257 to 1058

(17,5 to 72,0)

Gray

T14238T0012

T14240T0012

T14240T0012

1470 (100)27
Piston1470 (100)17514 (35)

236

1058 (72)315

94.3 (6,50)
102 (7,00)

Requires use of a
BMS1 and a BMS2

174 (12,0)
14.5 (1,00)
Bellows

145 (10,0)36.3 (2,50)

290 (20,0)72.5 (5,00)

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 (BMS1) with tripping hook (see figure 5). For underpressureand overpressure points greater than this maximum number, use a second manometric device (BMS2) for underpressure protection.

BM1

TYPE OS2BMS2(LEFT SIDE)

BM2

BMS1

E0564

BMS1
(RIGHT SIDE)

E0565

MECHANISM BOX (BM1) WITH 1 MANOMETRIC SENSING DEVICE (BMS1)MECHANISM BOX (BM2) WITH 2 MANOMETRIC SENSING DEVICES(BMS1 AND BMS2)

TOP-MOUNTED (STAND-ALONE TYPE OSE VALVE)

Figure 2. Types of Installation (Mounting on Horizontal Pipeline Only)

3

Type OS2ances pressures on both sides of the plug whenresetting.

nism virtually eliminates nuisance tripping commonly
found in other shutoff devices.

The Type OS2 Slam-Shut device can be used for allpressure ranges from 4.02-inches w.c. to 1470 psig (10mbar to 100 bar) by simply replacing the sensing
manometric device. In addition, the Type OS2 can be
configured for OverPressure ShutOff (OPSO),
UnderPressure ShutOff (UPSO), Overpressure andUnderPressure ShutOff (OUPSO), manual shutoff, andremote shutoff. In addition, the Type OS2 can utilize an
optional limit switches for remote alarm upon shutoff
when the valve is tripped.

Manometric Sensing Device (BMS1 or BMS2)(See Figure 2)

Mechanism Box (BM1 or BM2)
The mechanism box (BM1 or BM2, see figure 2) isdesigned to close the slam shut valve. The detectionof pressure variances is sensed by a double stage trip
mechanism (see figure 4). 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 thevalve plug to slam-shut and remains closed until thevalve 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 mecha-

Pressure from the system is sensed through control
lines into the manometric sensing device (BMS1,
BMS2, or BMS1 and BMS2). Depending on the configuration, the BMS1 or BMS2 will transmit thesepressure fluctuations to the mechanism box. If thesefluctuations reach the setpoint of the manometricsensing device (BMS1 or BMS2), the device will
activate the tripping mechanism in the mechanism box(BM1 or BM2) and cause the valve to slam shut.
The BM1 can be configured with only the BMS1 to tripon high pressure (OPSO), low pressure (UPSO), or highand low pressure (OUPSPO) (see figure 2). The BM2
can be configured with the BMS1 to trip on high pressure only (OPSO) and the BMS2 to trip on high pressure (OPSO), low pressure (UPSO) and high/low
pressure (OUPSO) (see figure 2 and refer to table 1).

Principle of Operation (See Figure 3)
For Type EZR principle of operation, refer to Type EZR
Instruction Manual.

MANOMETRIC DEVICE STEM

E0559

E0558

INLET PRESSURE

INLET PRESSURE

LOADING PRESSURE

OUTLET PRESSURE

OUTLET PRESSURE
TYPE EZROSX

Figure 3. Operational Schematics

4

TYPE OSE

Type OS2
Table 3. Main Valve Body Sizes, End Connection Styles, and Body Pressure Ratings
MAIN VALVE BODY SIZE
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN 150)
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN 150)

MAIN VALVE BODY MATERIALCast iron

WCB SteelEND CONNECTION STYLE(1)STRUCTURAL DESIGN RATING(2)NPT screwed (1 and 2-inch only)

400 psig (27,6 bar)

ANSI Class 125B FF

200 psig (13,8 bar)

ANSI Class 250B RF

500 psig (34,5 bar)

NPT screwed (1 and 2-inch only)

1480 psig (102 bar)

ANSI Class 150 RF

285 psig (19,6 bar)

ANSI Class 300 RF

740 psig (51,0 bar)

ANSI Class 600 RF

1480 psig (102 bar)

1. Ratings and end connections for other than ANSI standard can usually be provided. Contact your Fisher Sales Representative or Sales Office for assistance.
2. See Specifications and table 2 for additional pressure ratings.

The Type OSE slam-shut valve and the Type OS2
slam-shut device used on Type EZROSX provides
overpressure and/or underpressure protection by
shutting off the flow to the downstream system. The
slam-shut valve with external registration requires asensing line and is installed upstream of a pressure
reducing regulator.
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 OSE slam-shut valve tripping pressure is determined by the setting of the control spring.
Overpressure: when the downstream pressure increases past the setpoint, the pressure on top of thediaphragm overcomes the spring setting and moves the
manometric device stem.
Underpressure: when the downstream pressure decreases below the setpoint, the control spring pressure
below the diaphragm overcomes the downstreampressure and pushes the diaphragm which moves the
manometric device stem.
When the pressure of the downstream line rises above
the set pressure (or drops below the set pressure) the
manometric device senses the pressure change andtriggers the detection stage which activates the second
stage releasing the slam shut valve plug. A tight andtotal shutoff is ensured by the plug seal O-ring closing
on the orifice and is helped by the “dash pot” effectbetween the bonnet skirt and the valve plug. A “dashpot” effect occurs when the valve plug closes by having
both the closing spring and the inlet pressure pushingon top of the valve plug. This is accomplished by ports
around the skirt of the bonnet allowing inlet pressure
above the valve plug.

Installation

Personal injury, equipment damage, orleakage due to escaping gas or burstingof pressure-containing parts may result if
the slam-shut valve is installed where its
capabilities can be exceeded or whereconditions exceed any ratings of theadjacent 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, physicaldamage 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 theunit in a safe location.
Installation, operation, and maintenanceprocedures 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.
For Type EZR installation, refer to Type EZR Instruction
Manual.
Clean out all pipelines before installation and check to
be sure the valve has not been damaged or collected

5Type OS2
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 EZROSX is installed with the mechanism box
typically below the pipe. This slam-shut device canalso be installed in a pit that is subject to flooding byventing the mechanism box above the maximum
possible flood level. When using below ground, the ventmust 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-inch
NPT vent tapping. Provide protection on the relocatedvent by installing a screened vent cap into the end of
the vent pipe.
The Type OSE/EZROSX can be used along with atoken relief valve to minimize unnecessary shutoff. The

relief valve is set to open before the Type OSE/
EZROSX slam-shut valve activates. This arrangement
allows the relief valve to handle minor overpressure
problems such as gas thermal expansion or seatleakage due to dirt moving through the system which
may move out of the regulator during the next operating
cycle. The slam-shut valve does activate if the regulator has a major malfunction with excessive gas flowthat 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 theslam-shut device. If impossible to comply with thisrecommendation due to the pipe arrangement, it may bebetter to make the sensing line tap nearer the regulator
or slam-shut outlet rather than downstream of a block
valve. Do not make the tap near any elbow, swage, or
nipple which might cause turbulence.
DOWNSTREAM SENSING LINEDOWNSTREAM SENSING LINE
UPSTREAMBLOCK VALVEOPTIONAL STRAINERUPSTREAMBLOCK VALVEOPTIONAL STRAINER

BLOCK
VALVE

BLOCK
VALVE

TYPE OSE
SLAM SHUT VALVETYPE OSE
SLAM SHUT VALVEPRESSURE
REGULATORPRESSURE
REGULATOR

E0561

E0560

OVERPRESSURE AND UNDERPRESSURE SHUTOFF USINGONE MANOMETRIC DEVICEMINIMUM/MAXIMUM UPSTREAM AND DOWNSTREAM
PRESSURE

DOWNSTREAM SENSING LINEDOWNSTREAM SENSING LINEOPTIONAL STRAINERUPSTREAMBLOCK VALVE

BLOCK
VALVE

TYPE OSE
SLAM SHUT VALVEOVERPRESSURE AND UNDERPRESSURE SHUTOFF USINGTWO MANOMETRIC DEVICES

Figure 4. Typical Installations

6

BLOCK
VALVE

TYPE OSE
SLAM SHUT VALVEPRESSURE
REGULATOR
E0562

EXTERNAL TRIP
PRESSURE

OPTIONAL
STRAINERUPSTREAMBLOCK VALVEPRESSURE
REGULATOR
E0563

EXTERNAL SIGNAL

Type OS2
Adjustment

Startup

To avoid personal injury or property
damage due to explosion or damage toregulator or downstream components
during startup, release downstreampressure 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.

Typically, adjustments are carried out with the slamshut valve closed. Only the detection stage is reset.
(See Maintenance section.) Follow the procedures
below for setpoint adjustment and use the resetting tool
(key 3, figure 13) to move the adjusting screw.

Before any adjustment, check that the
spring range installed corresponds to therequired setpoint.

These startup procedures are for the Type OSE/OS2
only. For Startup procedures of the Type EZR portion ofType EZROSX refer to Type EZR Instruction Manual.

Before beginning adjustment procedures,
be sure there is no pressure in the manometric sensing device (BMS1 or BMS2).

1. Make sure the downstream shutoff valve is closed.

BMS1 (Figure 5)

2. The slam-shut is shipped with the slam-shut device
in the tripped position. To reset the slam-shut, follow theprocedure under Resetting the Trip Mechanism in the
Maintenance section.

Overpressure Shutoff Only

3. Slowly open the upstream shutoff valve.

Adjusting the threaded stem:
1. Remove the tripping hook or move to an inactive
position.

5. Check all connections for leaks.

2. Reset the detection stage only. (See figure 7 andResetting the Trip Mechanism in the Maintenance
Section.)

6. Adjust the slam-shut pressure setting by following
the appropriate procedures in the Adjustment section.

3. Adjust the threaded stem to a distance of 1/16-inch(1,59 mm) from the pin D1 (detection stage set).

4. Slowly open the downstream shutoff valve.

ADJUSTING SCREWLOCK NUT

TRIPPING HOOK

ADJUSTINGSCREWRESETTING TOOL FITTINGPUSH BUTTONPIN D2PIN D2
TRIPPING
PLATE

THREADED
STEM

TRIPPING
PLATE

THREADEDSTEM

PIN D1TRIPPING HOOKLOCK NUTSPIN D1THREADED STEMLOCK NUT
ADJUSTING
SCREW

E0606

ADJUSTING SCREWLOCK NUT

TRIPPINGHOOK
LOCK NUT

TRIPPINGHOOK

THREADED
STEM LOCK
NUT

E0607

OVERPRESSURE SHUTOFF

Figure 5. BMS1 Construction

OVERPRESSURE AND UNDERPRESSURE SHUTOFF

Figure 6. BMS2 Construction

7

Type OS2
4. Tighten threaded stem lock nut.
Adjusting the overpressure trip point:

3. Relax the control spring by unscrewing the adjustment screw.

1. Pressurize the BMS1 to desired trip pressure.

4. Pressurize the BMS1 to the desired overpressure
trip point

2. Screw the adjustment screw until the detection
stage can be reset.

5. Adjust the threaded stem so it just touches the pin
D1.

3. Unscrew the adjustment screw until the detection
stage trips.

6. Manually trip the detection stage by moving pin D1(see figure 5).

4. Check the pressure value at the trip point andadjust if necessary.

7. Unscrew the threaded stem two turns, or to a
distance of 1/16-inch (1,59 mm) from the pin D1.

5. Tighten adjustment screw lock nut.

8. Tighten threaded stem lock nut.

Underpressure Shutoff Only:

Overpressure adjustment:

Adjusting the threaded stem and tripping hook:

Same procedure as overpressure shutoff only.

1. Move the tripping hook to an inactive position.

Underpressure adjustment:

2. Reset the detection stage only. (See figure 7 andResetting the Trip Mechanism in the Maintenance
Section.)

1. Pressurize the BMS1 to an average pressure
between the overpressure and the underpressure trip
points.

3. Relax the control spring by unscrewing the adjustment screw.

2. Reset the detection stage only. (See figure 4 andResetting the Trip Mechanism in the Maintenance
Section)

4. Pressurize the BMS1 to the desired trip pressure
5. Adjust the threaded stem to a distance of 1/16-inch(1,59 mm) from the pin D1 (detection stage set).
6. Tighten threaded stem lock nut.
7. Put the tripping hook into position and adjust
tripping hook lock nuts until the hook is a distance of
1/16-inch (1,59 mm) from pin D2.
8. Tighten tripping hook lock nuts.
Adjusting the underpressure trip point:

3. Pressurize the BMS1 to the underpressure trip
point.
4. Adjust the hook by progressively moving lock nuts
until it trips.
5. Tighten tripping hook lock nuts.
6. Check the pressure value at the trip point andadjust if necessary.

BMS2 (Figure 6)

1. Maintain the desired trip pressure in BMS1.
2. Unscrew the adjustment screw until detection stage
is tripped.
3. Check the pressure value at the trip point andadjust if necessary.
4. Tighten adjustment screw lock nut.
Overpressure and Underpressure Shutoff:

Overpressure Shutoff Only
Adjusting the overpressure push button:
1. Remove the tripping hook.
2. Reset the detection stage only. (See figure 7 andResetting the Trip Mechanism in the Maintenance
Section)Adjusting the threaded stem:
1. Move the tripping hook to an inactive position.
2. Reset the detection stage only. (See figure 4 andResetting the Trip Mechanism in the Maintenance
Section)8

Be sure there is no pressure in the
manometric sensing device before doing
the following steps.

Type OS2
3. Compress control spring so that the distance
between the push button and the pin D2 no longer
increases.
4. Adjust the push button to a distance of 1/16-inch(1,59 mm) from the pin D1.
5. Tighten threaded stem lock nut.
Adjusting the overpressure shutoff only:Same procedure as adjusting the BMS1 overpressure
shutoff only. See page 7.
Underpressure Shutoff Only:
Adjusting the underpressure shutoff only tripping hook:

7. Unscrew the push button two turns or a distance of
1/16-inch (1,59 mm) from the pin D1.
8. Tighten threaded stem lock nut.
Adjusting the overpressure and underpressure trip
points:Overpressure adjustment procedure is the same as
adjusting the overpressure shutoff only.
Underpressure adjustment:
1. Pressurize the BMS2 to an average pressure
between the overpressure and underpressure trip
points.

1. Remove the overpressure push button or screw ittight to inactivate it.

2. Reset the detection stage only. (See figure 7 andResetting the Trip Mechanism in the Maintenance
Section)

2. Reset the detection stage only. (See figure 7 andResetting the Trip Mechanism in the Maintenance
Section)

3. Pressurize the BMS2 to the underpressure trip
point.

3. Tighten threaded stem lock nut.

4. Screw in the tripping hook progressively until
detection stage trips.

4. Relax the control spring by unscrewing the adjustment screw.

5. Tighten tripping hook lock nut.

5. Pressurize the BMS2 to the desired underpressure
trip point.

6. Check pressure value at the trip point and adjust if
necessary.

6. Adjust the tripping hook to a distance of 1/16-inch(1,59 mm) from pin D2.

Shutdown

7. Tighten tripping hook lock nut.
Adjusting the underpressure shutoff only:Same procedure as adjusting the BMS1 underpressure
shutoff only. See page 7.
Overpressure and Underpressure Shutoff:
Adjusting the push button:
1. Completely unscrew the tripping hook.
2. Reset the detection stage only. (See figure 7 andResetting the Trip Mechanism in the Maintenance
Section)
3. Relax the control spring by unscrewing the adjustment screw.
4. Pressurize the BMS2 to the overpressure shutoff
trip point.

To avoid personal injury or property
damage due to explosion or damage toshutoff device, regulator, or downstream
components during shutdown, release
downstream pressure to prevent an
overpressure condition on the regulator
diaphragm.
For Type EZR portion of EZROSX shutdown, refer toType EZR Instruction Manual.
Installation arrangements may vary, but in any installation it is important that the valves be opened or closed
slowly. The steps below apply to the typical installation.
1. Slowly close the downstream shutoff valve.

5. Adjust the push button until it just touches the pin
D1.

2. Slowly close the upstream shutoff valve.

6. Manually trip the detection stage by moving pin D1(see figure 5).

4. Slowly open vent valves upstream of the slam-shut.

3. Slowly open vent valves downstream of the slam-shut.

9Type OS2
Note

MaintenanceTo reset the detection stage, the pressurein the manometric sensing device must
be below the overpressure trip point and/or above the underpressure trip point.
Otherwise the detection stage cannot be
reset.

Instructions are given for complete disassembly andassembly. Key numbers are references in figure 14
unless otherwise noted.

Resetting the Trip Mechanism
Resetting of the Type OSE/EZROSX Slam-Shut Valveis done manually. After the Type OS2 has closed, it
must be manually reset before it can be placed back inservice. Before resetting the Type OS2, check for andcorrect the reason for the overpressure/ underpressure
condition. For the following procedures, see figures 7
and 8.

Never use an extension with the reset tool
when resetting the second stage.

Note
Because the Type OS2 mounted on theType EZROSX is turned 180°, the following directions apply to the Type OSE only,
however, the reset procedure for the TypeEZROSX is the same. When a specificdirection is given (i.e. top left), the TypeEZROSX direction will be reversed (i.e.
bottom right).
To reset the Type OS2, close the upstream block valve.
Open the front cover of the mechanism box.

RESET PIN WITH WHITE DOT
D2

D1
SECOND STAGE
RELEASING SHAFTTRAVEL STOP

E0611

RESETTINGTOOLVALVE OPEN

TYPE OS2 TRIPPING MECHANISMSTEP ATRAVEL STOPTRAVEL STOP

E0613

E0612

STEP BTRAVEL STOP

E0614

VALVE CLOSEDVALVE CLOSEDVALVE OPEN

SLAM-SHUT VALVE CLOSEDRESET DETECTION STAGE(FIRST STAGE)RESET POWER STAGE(SECOND STAGE)

Figure 7. Mechanism Trip Stages (Orientation for the Type OSE shown. Orientation for the Type EZROSX is rotated 180°.)10

Type OS2
Detection Stage (First Stage)
In the top center location of the box, there is a pin witha white dot on the front. Push this pin up and to theright (Type OSE only, see note on page 10). This action
will lock in the detection stage (see step A in figure 7).

side of the valve plug before the valve plug can be
moved off the seat. Continue turning the reset tool, thiswill raise the valve plug, compress the closing spring
and latch the second stage (power stage) mechanism.
Replace the reset tool on its holder and replace thecover. Slowly open the upstream block valve.

Power Stage (Second Stage)

Mechanism Box (BM1 or BM2)

Note

Disassembly

The reset tool is keyed and will only fit on
the second stage releasing shaft in one
orientation. Be sure the tool securely fits
onto the shaft before turning.
To reset the power stage use the square reset tool
located in the lower left corner of the mechanism box.
Place the square end of the tool on the second stage
releasing shaft in the center of the box and slowly
rotate clockwise (see step B in figure 7).
When movement is started on the stem, the internal
bypass will open and equalize the pressure on each

Avoid personal injury or damage toproperty from sudden release of pressureor uncontrolled gas or other process
fluid. Before disassembling, carefully
relieve all pressures. Use gauges tomonitor inlet and outlet pressures while
releasing these pressures.

LOCATION FOR SWITCH(KEY 27)RESET PIN WITH WHITE DOTMECHANISM
BOX (KEY 16)

TRIPPING PLATEMANOMETRICSENSINGDEVICE (BM1)
CLIP

MANOMETRIC DEVICETHREADED STEMSECOND STAGE RELEASING SHAFTSLIDING CLEVISTRAVEL STOPSTEMSCREW (KEY 39) AND
FLAT WASHER (KEY 40)

RESETTING TOOL(KEY 3)

CAP SCREW(KEY 21)
BONNET (KEY 15)

W8128A

Figure 8. Internal Parts

11

Type OS2
COUPLING
HEAD
COUPLING

HOLES FORSPANNERWRENCH
COUPLING
HEAD
EQUALIZER BYPASS(KEY 4)
ROLL PINS(KEY 4a)
W6853_1

VALVE PLUG
EQUALIZERBYPASSSEAT SEAL O-RING(KEY 32)

VALVE PLUG DISK

W6855

Figure 9. Equalizer Bypass and Coupling AssemblyNote
The only parts that are replaceable on theType OS2 are the equalizer bypass
component, manometric sensing device(BMS1 and BMS2), and the sealing components. The seat ring on the Type OSE ispressed into the body and is not fieldremovable.
Note
The position of the travel stop (figures 7
and 11) depends on the type of assembly
and its size. The travel stop must be in
the B position for 1 and 2-inch bodysizes. For all other body sizes, the travelstop must be in the C position.
The cover is held on by one screw which can be
unscrewed manually or by using a socket (maximum
recommended torque is 1.8 foot-pounds (2,5 N•m).)
1. Open the mechanism cover and replace the coverscrew O-ring by removing the circlip.

Figure 10. Valve Plug and Equalizer Bypass Assembly

4. Remove the two cap screws (key 39) holding themechanism box (key 16) to the bonnet and remove themechanism box (refer to figure 7).
5. Remove the nuts or cap screws (key 21) holding
the bonnet to the body.
6. The bonnet (key 15), valve plug (with equalizer
bypass, key 5), main spring (key 12), and small stembushing (key 24) will lift out of the body as a unit. Set
the unit on a hard flat surface on the valve plug andpress down on the bonnet to compress the main springallowing the stem to be unhooked from the couplinghead.
7. Use a spanner wrench (a wrench is supplied with
one of the replacement parts kits) to unscrew theequalizer bypass from the valve plug (refer to figures 8,9, and 10). The 1-inch body size equalizer bypass holds
the seat seal O-ring to the valve plug. On the 2-inch and3-inch sizes the equalizer bypass holds the plug disk
and the seat seal O-ring to the valve plug. The 4 and 6inch sizes valve plug disk and valve plug are held
together by six cap screws. On these sizes remove thecap screws and valve plug disk to replace the seat seal
O-ring (refer to figure 9).
Note

Trip the mechanism if it is not alreadyreleased by moving the pin D1 (see figure7), to remove as much spring tension on
the stem as possible.

The equalizer bypass is a common part
between all valve plug sizes. The equalizer bypass is not serviceable and must
be replaced as a unit.

2. Trip the mechanism by carefully turning the tripping
plate (pins D1 and D2) located by the manometricdevice stem clockwise (refer to figures 5 and 6).

8. To remove the equalizer bypass from the coupling
and coupling head, drive out the roll pin on the coupling(refer to figure 8).

3. Remove the clip (refer to figure 7). Pull the pin fromthe sliding clevis releasing the clevis so it can beturned and detached from the stem.

Assembly12

1. Attach a new equalizer bypass (key 4) to thecoupling using a roll pin (key 4a, refer to figure 8).

Type OS2
2. Screw the equalizer bypass into the valve plug withthe plug disk and a new seat seal O-ring (key 32,
figure 9). Be careful not to nick or pinch the O-ring whentightening the equalizer bypass. On the 4 and 6-inch
body sizes attach the plug disk and a new seat seal Oring to the valve plug using six cap screws (refer tofigures 10 and 14).
3. Replace the valve plug guides (key 7, figure 14) on
the inside of the skirt of the bonnet.
4. Place a new O-ring (key 2, figure 15) on the small
stem bushing (key 24, figure 15). Set the valve plugassembly on a hard flat surface. Set the main spring inplace on the valve plug. Place the bonnet on the springand compress the spring by pressing down on thebonnet. Attach the stem to the coupling head of thevalve plug through the bonnet. Slowly release thebonnet allowing spring tension to seat the small stembushing in the bonnet, be careful to properly seat the Oring (key 2).
5. Place the bonnet assembly into the body using a
new gasket (key 10, figure 14) and a new O-ring(key 11, figure 13). Secure the bonnet by tightening
down the nuts or cap screws.
6. Place the mechanism box onto the bonnet andattach using two cap screws (key 39) and two flat
washers (key 40).

5. Inspect the rubber joint gasket (key 38c) for
deterioration or damage and replace if necessary.
6. Loosen the adjustment lock nut on the adjustingscrew and then unscrew and then remove the adjustingscrew.
7. Remove the BMS spring (key 28) in the springcase.
For BMS Type 162 and 71 (Diaphragm, key 9)(See Figure 10):
8. Loosen the cap screws and nuts on the casing andremove the pressure sensing casing to reach thediaphragm assembly (key 9).
9. If diaphragm replacement is desired, loosen thehex nut which holds the diaphragm assembly at thevalve stem.
For BMS Type 236 and 315 (Bellows, key 9)(See Figure 10):
8. Loosen the socket screws at the pressure sensing
casing.
9. Remove the spring case from the pressure sensing
casing and then remove the bellows.
For BMS Type 27 and 17 (Piston, key 9)(See Figure 10):

7. Hook the sliding clevis to the stem and insert thepin (refer to figure 8). Secure the pin using the clip.

8. Loosen the socket screws on the pressure sensing
casing and remove the pressure sensing casing.

8. To reset see Resetting the Trip Mechanism in the
Maintenance section.

9. Loosen the socket screws on the spring case andremove the spring case away from the pressure sensing casing.

Manometric Sensing Device(BMS1 or BMS2)

10. Slide the piston out of the pressure sensing
casing.

The BMS1 is the first manometric sensing device. The
BMS2 is the second manometric sensing device.

Assembly

Disassembly

Proceed in the reverse order of disassembly.

1. Disconnect the pressure sensing line from the
manometric device (BMS).

Parts Ordering

2. If applicable, remove the BMS tripping hook fromthe adjustable stem of the BMS (see figures 6 and 7).
3. Loosen and remove the hex head cap screws(key 38a) and O-ring (key 38b) at the mechanism box/
manometric device joint. (See figure 11)
4. Carefully pull the BMS away from the mechanismbox (BM) followed by a rubber joint gasket (key 38c,
figure 11).

When corresponding with your Fisher Sales Office orSales Representative about this equipment, always
reference the equipment serial number or FS number.
When ordering replacement parts, also be sure toinclude the complete 11-character part number from thefollowing parts list.
For Type EZR parts ordering, refer to Type EZR Instruction Manual.

13

Type OS2PISTON(KEY 9)O-RING

DIAPHRAGM(KEY 9)BELLOWS(KEY 9)O-RINGBMS SPRING(KEY 28)

BMS SPRING(KEY 28)
MANOMETRIC SENSING
DEVICE 1 (BMS1) TRIPPINGHOOK KIT (KEY 25)

MANOMETRIC SENSING
DEVICE 2 (BMS2) TRIPPINGHOOK KIT (KEY 26)

MANOMETRIC SENSING
DEVICE 1 (BMS1) TRIPPINGHOOK KIT (KEY 25)

MANOMETRIC SENSING
DEVICE 1 (BMS1) TRIPPINGHOOK KIT (KEY 25)

MANOMETRIC SENSING
DEVICE 2 (BMS2) TRIPPINGHOOK KIT (KEY 26)

MANOMETRIC SENSING
DEVICE 2 (BMS2) TRIPPINGHOOK KIT (KEY 26)

E0608
E0609

DIAPHRAGM, TYPES 162 AND 71

E0610

PISTON, TYPES 27 AND 17

BELLOWS, TYPES 236 AND 315

Figure 11. Manometric Sensing Device Types

Parts List
Key

Description

Part Number

Parts kit, includes keys 5, 7, 10 and 11
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN 150)

FA197123X12
FA197130X12
FA197132X12
FA197134X12
FA197136X12

Parts kit, includes all the above plus key 4, and a spanner wrench
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN 150)

FA197124X12
FA197131X12
FA197133X12
FA197135X12
FA197137X12

Replacement Kit for BMS
Cap Screw, 2 included

FA402018T12

1

14

Valve Body AssemblyType OSE (E-Body)
Steel body
1-inch (DN 25)
NPT
ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
2-inch (DN 50)
NPT
ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
3-inch (DN 80)
ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF

T80543T0072
T80543T0012
T80543T0022
T80543T0032
T80544T0072
T80544T0012
T80544T0022
T80544T0032
T80545T0012
T80545T0022
T80545T0032

Key

Description

1

Valve Body Assembly (continued)
Type OSE (E-Body) (continued)
Steel Body (continued)
4-inch (DN 100)ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
6-inch (DN 150)ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
Cast iron body
1-inch (DN 25)
NPT
ANSI Class 125 FF
ANSI Class 250 RF
2-inch (DN 50)
NPT
ANSI Class 125 FF
ANSI Class 250 RF
3-inch (DN 80)
ANSI Class 125 FF
ANSI Class 250 RF
4-inch (DN 100)ANSI Class 125 FF
ANSI Class 250 RF
6-inch (DN 150)ANSI Class 125 FF
ANSI Class 250 RF
Type EZROSX (X-Body)
Steel body
1-inch (DN 25)
ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF

Part Number

T80546T0012
T80546T0022
T80546T0032
T80547T0012
T80547T0022
T80547T0032

T80543T0042
T80543T0052
T80543T0062
T80544T0042
T80544T0052
T80544T0062
T80545T0052
T80545T0062
T80546T0052
T80546T0062
T80547T0052
T80547T0062

T80548T0012
T80548T0022
T80548T0032

Type OS2TRAVEL STOP

E0604

Figure 12. Mechanism Box (BM1) with 1 Manometric Sensing Device (BMS1)

Key

Description

2
3
4
4a

Type EZROSX (X-Body) (continued)
Steel body (continued)
2-inch (DN 50)
ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
3-inch (DN 80)
ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
4-inch (DN 100)ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
6-inch (DN 150)ANSI Class 150 RFANSI Class 300 RF
ANSI Class 600 RF
O-Ring, Nitrile
Resetting Tool
Bypass Valve
Roll Pin (2 required)Part Number

Key

Description

Part Number

5

Plug and Bypass Assembly
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

FA181114T12
FA181115T12
FA181116T12
FA181117T12
FA181118T12

Valve Plug Guide
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

FA401950T12
FA401951T12
FA401952T12
FA401953T12
FA401954T12

T80549T0012
T80549T0022
T80549T0032
T80550T0012
T80550T0022
T80550T0032
T80551T0012
T80551T0022
T80551T0032
T80552T0012
T80552T0022
T80552T0032
FA400514X12
FA242915T12
FA180977T12
FA405635T12

7

9

Manometric Sensing Device, Diaphragm, Bellows, or Piston
Diaphragm
Type 162
FA117563T12Type 71
FA142549T12
Bellows
Type 236
FA127734T12Type 315
FA134507T12
PistonType 27 or 17
FA197352T12

15

Type OS2

E0605

Figure 13. Mechanism Box (BM2) with 2 Manometric Sensing Devices (BMS2)

Key

Description

Part Number

10

Gasket, Bonnet
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

14A6785X012
14A5685X012
14A5665X012
14A5650X012
14A6984X012

O-Ring, External, Bonnet
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

FA400009T12
FA400024T12
FA400259T12
FA400045T12
FA400262T12

Main Spring
Type OSE (E-Body)
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

T14241T0012
T14242T0012
T14243T0012
T14244T0012
T14244T0012

11

12

16

Key

Description

Part Number

12

Main Spring (continued)
Type EZROSX (X-Body)
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

T14241T0012
T14242T0012
T14244T0012
T14268T0012
T14269T0012

Bonnet1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

FA142209T12
FA142214T12
FA142220T12
FA142226T12
FA142232T12

Mechanism Box (BM)BM1
BM2

FA181067T12
FA181068T12

Manometric Device
Diaphragm
Type 162
Type 71

FA181105T12
FA181106T12

15

16

17

Type OS2
DETAIL OF 1-INCH(DN 25) BODY

E0602

DETAIL OF 2
AND 3-INCH(DN 50 AND 80)
BODIES

E0603

VALVE PLUG
SHOWN
OPEN

DETAIL AREAVALVE PLUG
SHOWN
CLOSED

E0601

4 AND 6-INCH (DN 100 AND 150) BODIES

Figure 14. Type OSE Slam-Shut Valve Assembly

17Type OS2

E0600

Figure 15. Small Stem Bushing Detail

Key

Description

17

Manometric Device (continued)
PistonType 27
Type 17
Bellows
Type 236
Type 315

Part Number

FA181107T12
FA181108T12

Flow Arrow (not shown)

1V106038982

19

Drive Screw (2 required) (not shown)

1A368228982

21

Cap Screw
1-inch (DN 25) (4 required)
2-inch (DN 50) (8 required)
3-inch (DN 80) (8 required)
4-inch (DN 100) (8 required)
6-inch (DN 150) (12 required)

1R281124052
1A453324052
1A454124052
1A440224052
1U513124052

Eyebolt (2 required)
4 and 6-inch (DN 100 and 150) only

FA403250T12

23
24

Nut (2 required)
4 and 6-inch (DN 100 and 150) only

FA404154T12

Bushing, small stem

FA181104T12

25

BMS1 Bracket Kit

FA181111T12

26

BMS2 Bracket Kit

FA181112T12

18

Description

Part Number

27

Trigger Switch, optional

FA181113T1228

BMS Control Spring, see table 1
PurpleOrangeRed
Yellow
Green
Blue
Gray
Brown
Black

T14232T0012
T14233T0012
T14234T0012
T14235T0012
T14236T0012
T14237T0012
T14238T0012
T14239T0012
T14240T0012

29

Drive Screw (2 required) (not shown)

1A368228982

32

Plug O-Ring
1-inch (DN 25)
2-inch (DN 50)
3-inch (DN 80)
4-inch (DN 100)6-inch (DN150)

FA400257T12
FA400263T12
FA400258T12
FA400260T12
FA400261T12

37

Bonnet/BM Gasket

FA142930T12

38a

Hex Head Cap Screw (2 required)

FA402018T12

38b

O-Ring Washer (2 required)

FA461150T12

38c

Joint Gasket

FA142931T12

39

Screw

FA402028T12

40

Flat Washer

FA405005T12

FA181109T12
FA181110T12

18

22

Key

Type OS2

LOCATION OF
CONTACTSWITCHWIRING
BK
BU

KEY 27WIRINGBU

BK

KEY 27

BN

NF—NORMALLY CLOSEDNO—NORMALLY OPEN

123456

NF—NORMALLY CLOSEDNO—NORMALLY OPENBNNF—BK/BU
NO—BK/BNNF—BK/BU
NO—BK/BN
E0616

E0615

C1 CONTACT VERSION—EXPLOSION PROOF CONNECTION
WITH CABLE AND TIGHT-SHUT PACKING GLANDAC

DC

Maximum Current

7.0A

0.8A

Maximum Voltage

400V

250V

C2 CONTACT VERSION—EXPLOSION PROOF CONNECTION
WITH EXPLOSION PROOF CONNECTOR BOX

KEY 27

Protection

EEx-d IIC T6

Tightness

IP 66

Temperature-20° to 160°F (-29° to 71°C)

WIRING
BK

BU
NF—NORMALLY CLOSEDNO—NORMALLY OPEN
A

Fastening

2 M3 screws

Cable

3 wires (black, blue, brown) H05VVF (0.118 x 0.3inch2 [3 x 0,75 mm2]) D (0.256-inch [6,5 mm])BNC

B
NF—BK/BU
NO—BK/BN
E0617

OPTIONS
C3 CONTACT VERSION—EXPLOSION PROOF CONNECTION
WITH TIGHT-SHUT CONNECTOR FOR INTRINSICALLY SAFECONTACT
VERSIONS

INSTALLMENT

C0
C1Explosion proof

ELECTRICAL CONNECTIONSTIGHTNESSCONNECTIONMECHANICALCONNECTIONS

IP 68

Without

Cap 1/2 NPT

IP 68

Explosion proof

3 m wire

3
A

C2

Explosion proof

IP 65

Explosion proof

Connector box explosion
proof/PE explosion proof

C3

Intrinsically safe

IP 68

Explosion proof

Intrinsically safe tight-shutconnector

CommunNF

NO

Connection

Black

Blue

Brown

Wires

4

5

ScrewedwiringB

C

Welded wiring

VERSIONS OF EXPLOSION PROOF LIMIT SWITCHES

Figure 16. Optional Contact Limit Switches

19

Type OS2©Fisher Controls International, Inc., 2001; All Rights Reserved
Fisher and Fisher Regulators are marks owned by Fisher Controls International, Inc. The Emerson logo is a trade mark and service mark of Emerson Electric Co.
All other marks are the property of their respective owners.

The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or guarantees, express
or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such products at any time without notice.

For information, contact Fisher Controls:
Marshalltown, Iowa 50158 USA
28320 Gallardon, France
Sao Paulo 05424 Brazil
Singapore 128461
Printed in U.S.A.

www.FISHERregulators.com

Regulators