Bulletin 71.6:OSE
March 2006

Type OSE Slam-Shut Valve

W8131

Figure 1. Type OSE

Features• Overpressure and Underpressure Protection—
The Type OSE can be equipped for OverPressure
ShutOff (OPSO), UnderPressure ShutOff (UPSO),
Overpressure and UnderPressure ShutOff (OUPSO),
manual shutoff, or remote shutoff. In addition, theType OSE utilizes limit switches for remote alarm upon
shutoff when the valve is tripped.
• Two-Stage Tripping Mechanism—The Type OSE
incorporates a two stage tripping mechanism thatsignificantly reduces nuisance tripping caused byvibrations or inlet pressure variations, which iscommonly found in other shutoff valves.

• High Accuracy—Rated at +/- 1% to 5% dependingon type, pressures, and service conditions.
• Easy In-Line Maintenance—Top entry
design reduces maintenance time and manpower
requirements; parts can be inspected and replaced
without removing the body from the line.
• Water Tight—The Type OSE is water tight to
10 feet (3,05 meters).
• Positive Shutoff—After closing, the slam-shut
valve stays closed until the system is shut down andthe valve is manually reset. An O-ring on the valve
plug seal provides tight shutoff.
D102356X012• Internal Bypass Valve—When resetting thetrip mechanism the internal bypass valve opens

automatically allowing pressure on each side of thevalve plug to equalize.

www.emersonprocess.com/regulators

Bulletin 71.6:OSE
Specifications
Body Size and End Connection StyleWCB Steel
1 and 2-inch (DN 25 and 50) NPT; 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; 1, 2, 3, 4, and 		
6-inch (DN 25, 50, 80, 100, and 150)ANSI Class 125 FF or 250 RF
Maximum Inlet Pressure1470 psig (101 bar) or maximum body rating, 		
whichever is lower.
(1)(2)

Outlet Pressure Ranges
See Table 3
Maximum Set Pressure1470 psig (101 bar) or maximum body rating, 		
whichever is lower.
Minimum Set Pressure
4.02-inches wc (10 mbar)

Pressure Registration
External
Accuracy+/-2.5% for anything at or below 1.45 psig (0,10 bar),+/-1% for anything above 1.45 psig (0,10 bar), or+/-5% for the piston Types 27 and 17.
Valve Plug Travel and Stem Diameter
BODY SIZE,INCHES (DN)

Valve plug travel,
INCHES (mm)1 (25)

1/2 (12,7)

2 (50)

1/2 (12,7)

3 (80)

1-1/8 (28,6)

4 (100)2 (50,8)

6 (150)2 (50,8)0.138 (3,51)

Maximum Temperature Capabilities(2)–20° to 150°F (–29° to 66°C)
Pressure Sensing Connections
1/4-inch NPT
Vent Connection
3/8-inch NPT

Manometric Sensing Device Specifications
See Table 3
Flow Capacities
See Table 4
Maximum Shutoff Pressure Differential
1470 psig (101 bar) or maximum body rating, 		
whichever is lower.
Representative Wide-Open Flow Coefficients
FLOW COEFFICIENTSBODY SIZE,INCHES (DN)

port diameter,
INCHES (mm)

Cg

Cv

C1

1 (25)

1.83 (46,5)

505

14.4

35

2 (50)

2.01 (51,1)

2210

60.6

35

3 (80)

3.15 (80,0)

4670

141

33

4 (100)4.02 (102)

7860

244

32

6 (150)5.91 (150)

14,850454

33Flow coefficients for the equalizer bypass are Cg = 25.7 and C1 = 35.

Maximum Flowing Pressure Differential
Body size,
inches (DN)

Maximum Flowing Pressure
Drops, PSIG (bar)

1 (25)
2 (50)
3 (80)
4 (100)6 (150)360 (24,8)360 (24,8)360 (24,8)150 (10,3)
85 (5,86)

Construction Materials
Body: Steel or Cast iron
Bonnet: Steel
Valve Plug: 304L Stainless steel
Valve Plug Seal O-Ring: Nitrile (NBR)
Seat Ring: 304L Stainless steel		
Mechanism Box: AluminumFirst and Second Stage Mechanism: Steel
Diaphragm: Reinforced Nitrile
Bellows: S31600 Stainless steel
Piston: S31600 Stainless steel
Approximate Weight
Body size, inches (DN)

approximate weight, pounds (kg)1 (25)
2 (50)
3 (80)
4 (100)6 (150)36 (16,3)
70 (31,8)
121 (54,9)216 (98,0)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 bulletin or any applicable standard limitation should not be exceeded.

valve plug stem
diameter, Inches (mm)Bulletin 71.6:OSE
Table 1. Main Valve Body Sizes, End Connection Styles, and Body Pressure Ratings
MAIN VALVE BODY SIZE

MAIN VALVE BODY MATERIAL

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)

Cast iron

WCB SteelEND CONNECTION STYLE(1)STRUCTURAL DESIGN RATING(2)NPT (1 and 2-inch (DN 25 and 50) 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 (1 and 2-inch (DN 25 and 50) 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 3 for additional pressure ratings.

Introduction
Description
The purpose of the Type OSE slam-shut device is tototally 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 OSE consists of a valve,
either mechanism box, BM1 or BM2, and either one or
two manometric sensing devices (BMS1 or BMS2).
Incorporated in the Type OSE valve plug is an automaticinternal bypass valve mechanism, which balancespressures on both sides of the plug when resetting.
The Type OSE Slam-Shut Valve can be used for allpressure ranges from 4.02-inches wc to 1470 psig
(10 mbar to 101 bar) by simply replacing the
manometric sensing device. In addition, theType OSE can be configured for overpressure
shutoff (OPSO), underpressure shutoff (UPSO),
overpressure and underpressure shutoff (OUPSO),
manual shutoff or remote shutoff. In addition, theType OSE can utilize an optional limit switch forremote alarm upon shutoff when the valve is tripped.

This unique double-stage trip mechanism virtuallyeliminates nuisance tripping commonly found in othershutoff devices.

Manometric Sensing Device (BMS1 or BMS2)(See Figure 3)
Pressure from the system is sensed through control
lines into the manometric sensing devices (BMS1,
BMS2, or BMS1 and BMS2). Depending on theconfiguration, the BMS1 and BMS2 will transmit thesepressure fluctuations to the mechanism box. If thesefluctuations reach the setpoint of the manometricsensing device, the device will activate the tripping
mechanism in the mechanism box (BM1 or BM2) andcause the valve to slam-shut.
The BM1 can be configured with only the BMS1 to tripon high pressure (OPSO), low pressure (UPSO), or
high and low (OUPSPO). The BM2 can be configured
with the BMS1 to trip on high pressure only (OPSO)
and the BMS2 to trip on high pressure (OPSO), lowpressure (UPSO) and high/low pressure (OUPSO)(refer to application Table 2).

Mechanism Box (BM1 or BM2)

Principle of Operation

The mechanism box (BM1 or BM2, see Figure 3) isdesigned to close the slam-shut valve. The detectionof pressure variances is sensed by a double stage
trip mechanism (see Figure 5). The first stage is thedetection stage and will only trip when the systempressure reaches the set pressure of the manometricsensing device. The second stage is the powerstage and once tripped by the first stage, the closing
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 mechanisim.

The Type OSE slam-shut valve serves to provide
overpressure and/or underpressure protection by
shutting down the flow to the downstream system.
The slam-shut valve with external registration
requires a sensing line. The slam-shut valve isinstalled 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 OSE slam-shut valve tripping pressure isdetermined by the setting of the control spring.

Bulletin 71.6:OSE
plug closes by having both the closing spring and theinlet pressure pushing on top of the valve plug. This isaccomplished by ports around the skirt of the bonnet
allowing inlet pressure above the valve plug.

Resetting the Trip Mechanism
Resetting of the Type OSE Slam-Shut Valve is done
manually. After the Type OSE has closed, it must
be manually reset before it can be placed back inservice. Before resetting the Type OSE, checkfor and correct the reason for the overpressure/underpressure condition.

E0558

INLET PRESSURE
OUTLET PRESSURE

Figure 2. Type OSE Operational Schematic

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 springpressure below the diaphragm overcomes thedownstream pressure and pushes the diaphragm
which moves the manometric device stem.
When the pressure of the downstream line increases
above set pressure (or drops below the set pressure)the manometric device senses the pressure change
and triggers the detection stage which activates thesecond stage releasing the slam-shut valve plug.
A tight and total shutoff is ensured by the plug seal
O-ring closing on the seat ring and is helped by the“dash pot” effect between the bonnet skirt and thevalve plug. A “dash pot” effect occurs when the valve

To reset the Type OSE, close the upstream and/or
downstream block valves. Open the front cover ofthe mechanism box. In the top center location of thebox, there is a reset pin with a white dot. Push this pin
up and to the right. This action will lock in stage one.
To reset the second 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 square shaft
in the center of the box and slowly rotate clockwise.
When movement is started on the stem, the internal
bypass will open and equalize the pressure on eachside 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 mechanism. Replace thereset tool on its holder and replace the cover.

Installation
The Type OSE should be installed in a horizontal position
only, with the flow going down through the seat ring (flowarrow on body) with the mechanism box above the body.
See Figure 6 for typical piping installation.
The Type OSE can be used along with a token relief
valve to minimize unnecessary shutoff. The relief
valve is set to open before the Type OSE slam-shut
valve activates. This arrangement allows the relief

Table 2. Applications and Construction Guide (See Figure 3)
APPLICATIONMECHANISM BOX REQUIREDMANOMETRIC SENSING
DEVICE REQUIRED

BM1

BM2

BMS1

BMS2

Overpressure Shutoff (OPSO)

Yes

No

Yes

No

Underpressure Shutoff (UPSO)

Yes

No

Yes

No

Overpressure Shutoff (OPSO) and Underpressure Shutoff (UPSO)

Yes

No

Yes(1)No

Overpressure Shutoff (OPSO) and Underpressure Shutoff (UPSO)

No

Yes

Yes(2)

Yes

Overpressure Shutoff (OPSO), Overpressure Shutoff (OPSO) and
Underpressure Shutoff (UPSO)

No

Yes

Yes(2)

Yes(1)

1. When using one BMS1 or BMS2 for both overpressure and underpressure shutoff, make sure that the difference between set pressures falls below the maximum range shown in Table 3.
2. When using a BMS1 and a BMS2, the BMS1 can only be used for high trip.

Bulletin 71.6:OSE
BM1

BM2

BMS2
(LEFT SIDE)BMS1

TYPE OS2BMS1(RIGHT SIDE)

E0564

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 3. Types of Installation (Mounting on Horizontal Pipeline Only)

Table 3. Spring Ranges, Part Numbers, and Maximum and Minimum Pressures for BMS1 and BMS2SPRING RANGE,
PSIG (bar)MAXIMUM
SPRING SPRING PART SENSING INLETCOLOR
NUMBER
PRESSURE,
PSIG (bar)

MANOMETRICSENSINGDEVICE TYPE

MANOMETRICSENSINGDEVICE STYLESETPOINT
TOLERANCE,
PSIG (bar)(1)

MAXIMUM DIFFERENCE
BETWEENOVERPRESSURE AND
UNDERPRESSURE(2),psig (bar)4.02 to 14.1-inches wc(10 to 35 mbar)

PurpleT14232T0012

0.058 (0,004)

0.145 (0,010)

9.97 to 33.2-inches wc(25 to 83 mbar)

OrangeT14233T0012

0.073 (0,005)

0.363 (0,025)

18-inches wc to 2.0 psig
(45 mbar to 0,14 bar)

Red

T14234T0012

0.145 (0,010)

0.725 (0,050)

1.0 to 3.5 (0,07 to 0,24)

Yellow

T14235T0012

0.203 (0,014)

0.870 (0,060)

1.7 to 5.6 (0,12 to 0,39)

Green

T14236T0012

0.261 (0,018)

2.18 (0,150)

2 to 11 (0,14 to 0,76)

Gray

T14238T0012

0.725 (0,050)

5.08 (0,350)

4 to 19 (0,28 to 1,31)

Brown

T14239T0012

1.16 (0,080)

8.70 (0,600)

7 to 33 (0,48 to 2,28)

Black

T14240T0012

2.47 (0,170)

16.0 (1,10)

15 to 75 (1,03 to 5,17)

Blue

T14237T0012

5.08 (0,350)

36.3 (2,50)

31 to 161 (2,14 to 11,1)

Brown

T14239T0012

10.2 (0,703)

79.8 (5,50)

59 to 235 (4,07 to 16,2)

Black

T14240T0012

23.2 (1,60)

145 (10,0)235 to 323 (16,2 to 22,3)

Brown

T14239T0012

43.5 (3,00)

323 to 588 (22,3 to 40,5)

Black

T14240T0012

588 to 808 (40,5 to 55,7)

Brown

T14239T0012

808 to 1470 (55,7 to 101)

Black

T14240T0012

81 to 323 (5,59 to 22,3)

Brown

T14239T0012

122 to 514 (8,41 to 35,4)

Black

T14240T0012

257 to 1058 (17,7 to 72,9)

Gray

T14238T0012

75 (5,17)162
Diaphragm

235 (16,2)1470 (101)71

27
Piston1470 (101)17514 (35,4)

236

1058 (72,9)315

94.3 (6,50)
102 (7,03)

Requires use of a
BMS1 and a BMS2

174 (12,0)
Bellows

14.5 (1,00)

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. For underpressure and overpressure points greater than
this maximum number, use a second manometric device (BMS2) for underpressure protection.

Bulletin 71.6:OSE
Table 4. Capacities
INLET PRESSURE,
Psig (bar)

PRESSURE DROP,
Psig (bar)Capacities in thousands of SCFH (Nm3/h) of 0.6 Specific Gravity Natural Gas
1-Inch (DN 25)

2-Inch (DN 50)

3-Inch (DN 80)

4-Inch (DN 100)

6-Inch (DN 150)

10 (0,69)

11.1 (0,30)

46.6 (1,25)

103 (2,76)

173 (4,64)

344 (9,22)50 (3,45)

19.2 (0,52)

80.4 (2,15)

178 (4,77)

325 (8,71)

597 (16,0)100 (6,90)

26.0 (0,70)

109 (2,92)240 (6,43)441 (11,8)810 (21,7)200 (13,8)36.0 (0,97)

150 (4,02)332 (8,90)

611 (16,4)1121 (30,0)43.7 (1,17)

182 (4,88)

404 (10,8)743 (19,9)1365 (36,6)

50.3 (1,35)

210 (5,63)465 (12,5)855 (22,9)1567 (42,0)500 (34,5)

56.1 (1,50)

234 (6,27)518 (13,9)954 (25,6)

1748 (46,8)600 (41,4)

61.3 (1,64)

256 (6,86)567 (15,2)1040 (27,9)1912 (51,2)

800 (55,2)

70.7 (1,89)

295 (7,91)

654 (17,5)1203 (32,2)

2204 (59,1)

1000 (69,0)78.9 (2,11)330 (8,84)730 (19,6)1343 (36,0)2462 (66,0)50 (3,45)

34.2 (0,92)

143 (3,83)329 (8,82)565 (15,1)

1047 (28,1)

100 (6,90)

48.8 (1,31)

204 (5,47)473 (12,7)817 (21,9)1506 (40,4)200 (13,8)

69.5 (1,86)

290 (7,77)

678 (18,2)

1173 (31,4)2157 (57,8)300 (20,7)

85.4 (2,29)357 (9,57)

835 (22,4)

1446 (38,8)2655 (71,2)

98.8 (2,65)413 (11,1)

966 (25,9)1675 (44,9)3074 (82,4)

600 (41,4)

121 (3,24)506 (13,6)1187 (31,8)2058 (55,2)3775 (101)800 (55,2)

140 (3,75)585 (15,7)1372 (36,8)2380 (63,8)4365 (117)1000 (69,0)156 (4,18)655 (17,6)

1536 (41,2)

2664 (71,4)4884 (131)300 (20,7)400 (27,6)400 (27,6)

5 (0,34)

20 (1,38)

valve to handle minor overpressure problems suchas gas thermal expansion or seat leakage due todirt moving through the system which may moveout of the regulator during the next operating cycle.
The slam-shut valve will activate if the regulator has
a major malfunction with excessive gas flow thatexceeds the token relief capacity.
For gases of other specific gravities, multiply the given
capacity by 0.775, and divide by the square root of theappropriate specific gravity. If the capacity is desired
in normal cubic meters per hour (Nm3/h) at 0°C and1,01325 bar, multiply scfh by 0.0268.

supplied to the factory is 30 psig (2,07 bar), andmaximum inlet pressure to the equipment in thefactory is 50 psig (3,45 bar). A Type OSE Slam-Shut
Valve will be used to protect the equipment in caseof an overpressure incident. The slam-shut valve will
also be used to shutoff flow on underpressure in casethe transmission line falls to 100 psig (6,90 bar) inlet
pressure, (thus preventing further loss of transmission
line pressure and possible loss of all line pressure).
The regulator has been sized with the assumption that
5 psig (0,34 bar) will be the maximum pressure drop
across the slam-shut valve.
1. Gather necessary data:

Capacity Information
Flows are in thousands of scfh at 60°F and 14.7 psia
and in thousands of Nm3/h at 0°C and 1,01325 bar of
0.6 specific gravity natural gas.
To determine equivalent capacities for air, propane,butane, or nitrogen, multiply the capacity by thefollowing appropriate conversion factor: 0.775 forair, 0.628 for propane, 0.548 for butane, or 0.789 fornitrogen. For gases of other specific gravities, multiply
the given capacity by 0.775, and divide by the squareroot of the appropriate specific gravity.

Sizing Example
In this example (see Figure 4) natural gas is being
supplied to a single factory. The normal pressureConditions:P1max = 300 psig (20,7 bar)
P1min = 100 psig (6,90 bar)
P2reg set = 30 psig (2,07 bar)
P2max = 50 psig (3,45 bar)Pslam-shut = 5 psig (0,34 bar)
End connections: 300 RF flanged
Natural Gas
SG = 0.6
Qmax = 65 000 SCFH (1742 Nm3/h)
2. Determine appropriate body size of Type OSE:
Using the maximum flow of 65 000 SCFH (1742 Nm3/h),and an allowable pressure drop of 5 psig (0,34 bar),
Table 4 shows that the 2-inches (DN 50) Type OSE canpass a flow of 108 000 SCFH (2894 Nm3/h).

Bulletin 71.6:OSE
BMS1

BMS2

BM2
P1 = 100 to 300 psig
(6,90 to 20,7 bar)
100 psig (6,90 bar)minimum

E0566

P2 = 30 psig (2,07 bar)

E0566

TYPE OSE

REGULATOR

P2max = 50 psig (3,45 bar)line size = 3-inches (DN 80)
regulator size = 2-inches (Dn 50)
qmax = 65 000 scfh (1742 Nm3/h)

Figure 4. Type OSE Sizing Example

INLET PRESSURE

5.8 PSIG (0,4 bar)
4.4 PSIG (0,3 bar)
2.9 PSIG (0,2 bar)
1.4 PSIG (0,1 bar)

PSIG (bar)1450 (100)14.5 PSIG (1 bar)
29 PSIG (2 bar)
43.5 PSIG (3 bar)
58 PSIG (4 bar)
72.5 PSIG (5 bar)725 (50)145 (10)14.5 (1)Q = 3.8 SCFH (0,10 Nm3/h)

1-INCH (DN 25) BODY

Q = 19.2 SCFH (0,52 Nm3/h)
2-INCH (DN 50) BODY

Q = 38.5 SCFH (1,03 Nm3/h)

3-INCH (DN 80) BODY
4-INCH (DN 100) BODY
Q = 192 SCFH (5,15 Nm3/h)

E0597

6-INCH (DN 150) BODY
Q = 384 SCFH
(10,3 Nm3/h)

Q = 1922 SCFH
(51,5 Nm3/h)

Q = 3845 SCFH
(103 Nm3/h)

FLOW CAPACITIES IN THOUSANDs of SCFH (Nm3/h) OF 0.6 SPECIFIC GRAVITY NATURAL GAS

Figure 5. Sizing ExampleBulletin 71.6:OSE
DOWNSTREAM SENSING LINEDOWNSTREAM SENSING LINE
UPSTREAMBLOCK VALVEOPTIONAL STRAINERUPSTREAMBLOCK VALVEOPTIONAL STRAINER

BLOCK
VALVE

TYPE OSE
SLAM-SHUT VALVEPRESSURE
REGULATOR

E0560

BLOCK
VALVE

TYPE OSE
SLAM-SHUT VALVEOVERPRESSURE AND UNDERPRESSURE SHUTOFF
USING ONE MANOMETRIC DEVICEMINIMUM/MAXIMUM UPSTREAM AND
DOWNSTREAM PRESSUREDOWNSTREAM SENSING LINEDOWNSTREAM SENSING LINEOPTIONAL
STRAINEROPTIONAL STRAINERUPSTREAMBLOCK VALVETYPE OSE
SLAM-SHUT VALVE
E0562

PRESSURE
REGULATOR

E0561

BLOCK
VALVE

PRESSURE
REGULATOROVERPRESSURE AND UNDERPRESSURE SHUTOFF
USING TWO MANOMETRIC DEVICES

EXTERNAL TRIP
PRESSURE

UPSTREAMBLOCK VALVE

BLOCK
VALVE

TYPE OSE
SLAM-SHUT VALVEPRESSURE
REGULATOR

E0563

EXTERNAL SIGNAL

Figure 6. Typical Installations

3. Select appropriate manometric device:
Table 3 lists the different selections for the
manometric sensing device (BMS1 or BMS2). For
the overpressure protection setting of 50 psig
(3,45 bar), choose a Type 071 manometric device
with a 15 to 75 psig (1,03 to 5,17 bar) spring. This
spring is chosen because it has less setpoint drift
than the 30 to 160 psig (2,07 to 11,0 bar) spring.
For the underpressure protection of the transmissionline, a separate manometric device must be used.
A Type 236 manometric device can be used with a
81 to 323 psig (5,59 to 22,3 bar) spring setting forunderpressure protection.
4. Check the pressure ratings:
Because of the flange limitations Type OSE with
300 RF flanged end connections has a maximum
pressure rating of 740 psig (51,0 bar), which willsafely handle the 300 psig (20,7 bar) maximum inlet
pressure. The Type 071 manometric device will holdpressure up to 235 psig (16,2 bar) (see Table 2).
The slam-shut valve will shut the pressure off at
50 psig (3,45 bar), preventing an overpressure of theType 071 and the downstream equipment. The
Type 236 for underpressure protection could see
the full inlet pressure of 300 psig (20,7 bar). Table 2
shows that the maximum pressure rating for theType 236 is 514 psig (35,4 bar), so it will safely
handle the maximum inlet pressure.

Sizing Example Using Figure 5
The illustration in Figure 5 is an alternative way to size
the Type OSE Slam-Shut Valve. The following steps
can be taken to determine the proper size valve for agiven set of conditions. The arrows shown in Figure 5
follow the parenthesis example given in each step.

Bulletin 71.6:OSE
6.54
(166)

B

B

BMS2
BMS1

7.28
(185)
5.28
(134)

4.72
(120)

INCHES
(mm)
E0598

A

A

TYPE
Mechanism Box (BM)BM1

for 1 BMS

BM2

for 2 BMS

162
Manometric Device
(BMS)

71
27 or 17236
315

Diaphragm
PistonBellows

DIMENSIONS, INCHES (mm)A

B

WEIGHT,
POUNDS (kg)5.51 (2,50)----

5.51 (2,50)

7.13 (181)3.27 (83,1)

5.73 (2,60)

6.89 (175)1.42 (36,1)

2.65 (1,20)

8.03 (204)1.42 (36,1)

5.07 (2,30)

7.95 (202)1.42 (36,1)

5.29 (2,40)

8.78 (223)

1.42 (36,1)

6.17 (2,80)

Figure 7. Type OSE Dimensions

1. Find the minimum inlet pressure for the application on
the upper portion of the graph (ie: 725 psig (50,0 bar)).
2. Move across to the maximum differential that canbe tolerated across the valve for the given application(2.9 psig (0,20 bar)).
3. Trace down vertically to the diagonal line whichshows the maximum flow required for the given
application (384 000 SCFH (10,291 Nm3/h)).

4. Move straight across to the right, and the closest
body size below the last point is the smallest body sizefor the given application (3-inches (DN 80) body size).
5. Check pressure and temperature ratings ofthe slam-shut valve, and select the appropriate
manometric devices and options.

Bulletin 71.6:OSE

0.98 (25)
MECHANISM
BOX REMOVALCLEARANCEC

D

B

BODY SIZE,INCHES (DN)

INCHES
(mm)

A

E0599

DIMENSIONS, INCHES (mm)A
NPT

ANSI Class 125B FF

ANSI Class 150 RFANSI Class 250B RF

ANSI Class 300 RF

1 (25)

8.25 (209)7.25 (184)

7.3 (185)

7.75 (197)

7.8 (198)

8.3 (211)

2 (50)

11.3 (287)10.0 (254)

10.0 (254)

10.5 (267)

10.0 (254)

11.3 (287)

3 (80)----

11.8 (300)

12.5 (317)

12.5 (317)

12.5 (317)

13.3 (338)

4 (100)----13.9 (353)

14.5 (368)

14.5 (368)

14.5 (368)15.5 (394)

6 (150)----17.8 (452)18.6 (472)18.6 (472)18.6 (472)20.0 (508)

DIMENSIONS, INCHES (mm)
BODY SIZE,INCHES (DN)

B

C

D

APPROXIMATEWEIGHT,
POUNDS (kg)ANSI Class 150 RFANSI Class 300 RF
or 600 RF

ANSI Class 150 RF,
300 RF, or 600 RF

ANSI Class 150 RFANSI Class 300 RF
or 600 RF

1 (25)

2.2 (55,9)

2.5 (63,5)

12.6 (320)

4.6 (117)

4.9 (124)

2 (50)

3.0 (76,2)

3.3 (83,8)

13.2 (335)

6.0 (152)

6.5 (165)

70 (31,8)

3 (80)

3.7 (94,0)

4.1 (104)14.2 (361)

7.5 (190)

8.3 (211)

121 (54,9)

4 (100)4.5 (114)

5.0 (127)

16 (406)

9.0 (229)

10.0 (254)216 (98,0)

6 (150)5.5 (140)

6.6 (168)16.2 (411)

14 (356)

14 (356)445 (202)

Figure 7. Type OSE Dimensions (continued)

10

ANSI Class 600 RF

36 (16,3)

Bulletin 71.6:OSE
Ordering Guide
Body Size (Select One)Slam-Shut Trip Pressure Setting (Select One)

1-inch (DN 25)***2-inch (DN 50)***3-inch (DN 80)***4-inch (DN 100)***6-inch (DN 150)***Overpressure Protection Only   Supply setpoint required
Underpressure Protection Only   Supply setpoint required
Overpressure Protection andUnderpressure Protection   Supply overpressure setpoint required   Supply underpressure setpoint required
Overpressure Protection, Overpressure
Protection and Underpressure Protection   Supply overpressure setpoint required   Supply overpressure setpoint required   Supply underpressure setpoint required

Body Material and End Connection
Style (Select One)
Cast Iron Body   NPT (1 and 2-inch (DN 25 and 50) only)***   125B FF**   250B RF**WCB Steel Body   NPT (1 and 2-inch (DN 25 and 50) only)***   150 RF***   300 RF**   600 RF**   PN 16/40**

Explosion-Proof Limit Switch (Optional)
Yes**

Specification Worksheet
Application:
Specific UseLine Size
Gas Type and Specific Gravity
Gas Temperature
Relief Valve Size:
Brand of upstream regulator?
Orifice size of the upstream regulator?
Wide-open coefficient of the upstream regulator?

Fisher Regulators Quick Order Guide***

Standard - Readily Available for Shipment**

Non-Standard - Allow Additional Time for Shipment*

Special Order, Constructed from Non-Stocked Parts.
Consult your Fisher Sales Representative for Availability.

Pressure:
Maximum Inlet Pressure (P1max)
Minimum Inlet Pressure (P1min)
Downstream Pressure Setting(s) (P2)
Maximum Flow (Qmax)
Performance Required:
Accuracy Requirements?
Need for Extremely Fast Response?
Other Requirements:

Availability of the product being ordered is determined by the component with thelongest shipping time for the requested construction.

11

Bulletin 71.6:OSE

Industrial Regulators

Natural Gas Technologies

Industrial/High Purity

USA - Headquarters
McKinney, Texas 75050 USA
Tel: 1-800-558-5856
Outside U.S. 1-469-293-4201

USA - Headquarters
McKinney, Texas 75050
Tel: 1-800-558-5856
Outside U.S. 1-469-293-4201

Asia-PacificShanghai, China 201206
Tel: 86-21-5899 7887

Asia-PacificSingapore, Singapore 128461
Tel: +65 6777 8211

TESCOM
Elk River, Minnesota 55330 USA
Tel: 1-763-241-3238
Selmsdorf, Germany 23923
Tel: +49 (0) 38823 31 0

EuropeBologna, Italy 40013
Tel: 39 051 4190611

EuropeBologna, Italy 40013
Tel: 39 051 4190611
Gallardon, France 28320
Tel: +33 (0)2 37 33 47 00

For further information visit www.emersonprocess.com/regulators
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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 orguarantees, 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 suchproducts at any time without notice.
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