Bulletin 71.4:289
08/90

289 Series Spring-Loaded Relief Valves

W1870-2

W1870-2

W0210-1
W0209-2

1-INCH TYPE 289H AND 289HH

2-INCH TYPE 289H

Figure 1. Type 289H and 289HH Relief Valves

The 289 Series relief valve is a throttling relief valve
used downstream of pressure regulators to protect thedownstream system from overpressure. A smooththrottling action minimizes pressure surges in thesystem during emergency operation. These relief valves
are available in 1/4, 3/4, 1, or 2-inch sizes with springranges (relief pressure settings) from 5 inches w.c. to75 psig (0.01 to 5.2 bar).
All sizes above 1/4-inch feature a pitot tube booster(figure 1) for achieving the highest possible relief
capacity with a minimum buildup of system pressure.
When the valve is opening, high gas velocity throughthe orifice creates an area of relatively low pressurenear the end of the pitot tube. This pitot tube effectforms a partial vacuum above the diaphragm whichhelps to open the valve.

Features• Throttling Type Relief—Smooth, sensitive throttling
action minimizes pressure surges.
• High Flow Rates—As shown by the figure 4
capacity curves, high flow rates can be achieved withminimum pressure buildup due to the boosting system
which increases the relief valve opening.
• Small Size—The 289 Series relief valves are small
and compact, making them suitable for areas limitedin space.
• Reliability Due to Simplicity—A single internal assembly decreases the possibility of mechanical failure.
D100154X012

The relief valve diaphragm functions as a valve disk tocontrol flow in all types except the 289H and 289HH,
which use O-ring seats. The nitrile or neoprene seating

surfaces provide tight shutoff. The 289 Series relief valves
are ideal for low pressure settings due to the increased
sensitivity provided by the large diaphragm area.

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Bulletin 71.4:289
Specifications
Available Configurations
Type 289A (figure 2): 1/4-inch spring-loaded reliefvalve for relief pressure settings of 3 to 22 psig,(0.21 to 1.5 bar) two spring ranges
Type 289H (figure 1): 1 or 2-inch spring-loaded
relief valve for relief pressure settings of 1 to 50
psig (0.07 to 3.5 bar) four spring ranges, in the1-inch size and of 7-inches w.c. to 10 psig, (0.02 to0.69 bar), four spring ranges, in the 2-inch size
Type 289HH (figure 1): 1-inch spring-loaded relief
valve for relief pressure settings of 45 to 75 psig
(3.1 to 5.2 bar)
Type 289L (figure 3): 3/4 or 1-inch spring-loaded
relief valve for relief pressure settings of 10 to40-inches w.c., (0.03 to 0.1 bar), two spring ranges
Type 289U (figure 2): 1/4-inch spring-loaded relief
valve for relief pressure settings of 5-inches w.c. to3 psig, (0.01 to 0.21 bar), two spring ranges
Inlet Connections
Type 289L: 3/4 or 1-inch NPT female
Types 289A and 289U: 1/4-inch NPT female
Type 289H: 1 or 2-inch NPT female
Type 289HH: 1-inch NPT female
Outlet (Vent) Connections
Same size as inlet connection
Maximum Allowable Relief (Inlet) Pressure(1) andMaximum Relief Set Pressure
See table 1
Capacity Data
See figure 4Standard Construction Materials
Valve Body and Spring Case
Types 289A and 289U: ZincType 289H (1-inch), 289HH, and 289L: AluminumType 289H (2-inch): Cast iron body with aluminum
spring case
Diaphragm
Type 289A: Neoprene
Types 289H and 289HH: Nitrile or fluoroelastomer
All Others: NitrileOrifice
Types 289A and 289L: AluminumType 289H (2-inch Only): Brass or Stainless steel
O-Ring Seat (Types 289H and 289HH Only):
Nitrile or Fluoroelastomer(2)O-Ring Seat Holder and Washer (1-inch Types
289H and 289HH Only): Aluminum
Seat Washer (2-inch Type 289H Only): Stainlesssteel
Pitot Tube
Types 289H and 289HH (1-inch), and 289L:AluminumType 289H (2-inch): Brass or Stainless steel
Gaskets
Type 289L: Neoprene
All Others: Composition
Spring: Zinc-plated steel
Diaphragm Plate
Types 289A and 289U: ZincAll Others: Zinc-plated steel
Closing Cap
Type 289L: Plastic, Aluminum, or ZincType 289H (2-inch): Zinc
Material Temperature Capabilities(1)With Nitrile and Neoprene Elastomers:–20 to150°F (–29 to 66°C)
With Fluoroelastomers: 20 to 300°F (–7 to 149°C)
Available with Types 289H and 289HH only
Approximate Shipping Weight
Types 289A and 289U: 0.75 lb (0.34 kg)
Type 289H
1-inch Size: 4 lb (1.8 kg)
2-inch Size: 15 lb (6.8 kg)
Type 289HH: 4 lb (1.8 kg)
Type 289L: 1.5 lb (0.7 kg)
Options• TFE diaphragm protector (Types 289A and289U only)• wire-seal on closing cap (1-inch Type 289L only)

1. The pressure/temperature limits in this bulletin and any applicable standard limitation should not be exceeded.
2. Bubble-tight shutoff can not be attained at settings below 5 psig with fluoroelastomer O-ring seat.

2

Bulletin 71.4:289

W1870-2

W0212-1

Figure 2. Type 289U Relief Valve (Also Typical of Type 289A Relief Valve)

W0203-1
W1870-2

Figure 3. Type 289L Relief Valve3Bulletin 71.4:289
701” TYPE 289H
VENT SCREEN INSTALLED
6050 PSIG
1D745527142
50
INLET PRESSURE—PSIG

40 PSIG
1D745527142
4030 PSIG
1D745527142
3020 PSIG
1D745527142
20

A—15 PSIG
1D751527022
B—10 PSIG
1D892327022
C—4 PSIG
D—1 PSIG
1F826927052

AB

10C
D001020304050607080

0.6 SPECIFIC GRAVITY GAS FLOW RATE—
THOUSAND CUBIC FEET PER HOUR—14.7 PSIA AT 60°F

162” TYPE 289HNO VENT RESTRICTION

11410 PSIG
1B536927052

INLET PRESSURE—PSIG

127 PSIG
1B536827052

1085 PSIG
1B536827052
62 PSIG
1B536627052

4

1/2 PSIG
1B536527052

21 PSIG
1B536627052
00481216202428323640

4448

0.6 SPECIFIC GRAVITY GAS FLOW RATE—
THOUSAND CUBIC FEET PER HOUR—14.7 PSIA AT 60°F
NOTE:
1 LESS THAN 5% CAPACITY LOSS CAN BE EXPECTED WITH THE VENT SCREEN
INSTALLED ON THE 2-INCH TYPE 289H AT MAXIMU FLOW.
2. WHEN SELECTING ANY RELIEF VALVE FOR INSTALLATION DOWNATREAM OF A
REGULATOR, THE CAPACITY OF THE RELIEF VALVE SHOULD BE COMPARED WITH THE
WIDE-OPEN CAPACITY OF THE REGULATOR.
3. BUBBLE POINT RELIEF SETTING AND SPRING PART NUMBER ARE NOTED ON
EACH CURVE.
4. TO CONVERT TO EQUIVALENT CAPACITIES OF OTHER GASES, MULTIPLY VALUESOBTAINED FROM CURVE BY THE FOLLOWING FACTORS: AIR–0.78, PROPANE–0.628,BUTANE–0.548, NITROGEN–0.789
B2309Figure 4. Capacity for 0.6 Specific Gas at 14.7 Psia and 60° F

452566064

Bulletin 71.4:289
10090

INLET PRESSURE—PSIG

75 PSIG
8060 PSIG
7050 PSIG

60501”TYPE 289HHVENT SCREEN INSTALLEDSPRING 1D745527142
40010203040506070800.6 SPECIFIC GRAVITY GAS FLOW RATE—
THOUSAND CUBIC FEET PER HOUR—14.7 PSIA AT 60°F

10090INLET PRESSURE—PSIG

75 PSIG

8060 PSIG

7050 PSIG

60501”TYPE 289HH
NO VENT RESTRICTIONSPRING 1D745527142
4001020304050607080901001101200.6 SPECIFIC GRAVITY GAS FLOW RATE—THOUSAND CUBIC FEET PER HOUR—14.7 PSIA AT 60°F
NOTE:
1. WHEN SELECTING ANY RELIEF VALVE FOR INSTALLATION DOWNATREAM OF A
REGULATOR, THE CAPACITY OF THE RELIEF VALVE SHOULD BE COMPARED WITH THE
WIDE-OPEN CAPACITY OF THE REGULATOR.
2. BUBBLE POINT RELIEF SETTING AND SPRING PART NUMBER ARE NOTED ON
EACH CURVE.
3. TO CONVERT TO EQUIVALENT CAPACITIES OF OTHER GASES, MULTIPLY VALUESOBTAINED FROM CURVE BY THE FOLLOWING FACTORS: AIR–0.78, PROPANE–0.628,
BUTANE–0.548, NITROGEN–0.789
B2310

Figure 4.Capacity for 0.6 Specific Gas at 14.7 Psia and 60° F (Continued)

5Bulletin 71.4:289

5138
TYPE 289U

111
INLET PRESSURE—INCHES W.C.

4INLET PRESSURE—PSIG

3 PSIG
0F058227022
83

32 PSIG
0F058227022
2 IN. WC
0F058227022

255

12824 IN. WC
7 IN. WC
0V060227022
000100

200

300

400

500

600

700

0.6 SPECIFIC GRAVITY GAS FLOW RATE—
THOUSAND CUBIC FEET PER HOUR—14.7 PSIA AT 60°F

1113/4” AND 1”TYPE 289L
VENT SCREEN INSTALLED

3833/4” SIZE
1 PSIG(28 IN. W.C.)1B413727022

2551” SIZE
2811/2 PSIG (14 IN. WC) 1B413627222
0001000

20003000

4000500060007000

0.6 SPECIFIC GRAVITY GAS FLOW RATE—THOUSAND CUBIC FEET PER HOUR—14.7 PSIA AT 60°F

NOTE:
1. WHEN SELECTING ANY RELIEF VALVE FOR INSTALLATION DOWNATREAM OF A
REGULATOR, THE CAPACITY OF THE RELIEF VALVE SHOULD BE COMPARED WITH THEWIDE-OPEN CAPACITY OF THE REGULATOR.
2. BUBBLE POINT RELIEF SETTING AND SPRING PART NUMBER ARE NOTED ON
EACH CURVE.
3. TO CONVERT TO EQUIVALENT CAPACITIES OF OTHER GASES, MULTIPLY VALUESOBTAINED FROM CURVE BY THE FOLLOWING FACTORS: AIR–0.78, PROPANE–0.628,
BUTANE–0.548, NITROGEN–0.789
B2311

Figure 4. Capacity for 0.6 Specific Gas at 14.7 Psia and 60° F (Continued)

68000

9000

10,000

INLET PRESSURE—INCHES W.C.

INLET PRESSURE—PSIG

4Bulletin 71.4:289
Table 1. Spring Ranges and Maximum Allowable Relief (Inlet) Pressures
BODY SIZES,INCHESTYPE

SPRING RANGE(RELIEF PRESSURE SETTINGS)SPRING PARTNUMBER

MAXIMUM ALLOWABLE
RELIEF SETTING(1)MAXIMUM ALLOWABLE
RELIEF (INLET)PRESSURE(2)289U

5 to 25-inches w.c. (12 to 62 mbar)
20-inches w.c. to 3 psig (50 mbar to 0.21 bar)

0V060227022
0F058227022

3 psig (0.21 bar)

10 psig (0.69 bar)

1/4
289A

3 to 13 psig
11 to 22 psig

(0.21 to 0.9 bar)(0.76 to 1.5 bar)

0Z056327022
1B268227022

22 psig (1.52 bar)

45 psig (3.1 bar)289L

3 to 8-inches w.c.
5 to 18-inches w.c.
10 to 18-inches w.c.
12 to 40-inches w.c.

(7 to 20 mbar)(12 to 45 mbar)(25 to 45 mbar)(30 to 99 mbar)

1B413527022
1N3112X0012
13A7917X012
13A7916X012

40-inches w.c. (99 mbar)

7 psig (0.52 bar)289H

1 to 4.5 psig
4 to 15 psig
10 to 20 psig
15 to 50 psig

(0.069 to 0.3 bar)(0.28 to 1.0 bar)(0.69 to 1.4 bar)(1.0 to 3.4 bar)

1F826927052
1D892327022
1D751527022
1D745527142

50 psig (3.4 bar)

100 psig (6.9 bar)2289H

7 to 18-inches w.c.
0.5 to 2.25 psig
1.75 to 7 psig
4 to 10 psig(17 to 45 mbar)(0.034 to 0.16 bar)(0.12 to 0.52 bar)(0.28 to 0.69 bar)

1B536527052
1B536627052
1B536827052
1B536927052

10 psig (0.69 bar)

25 psig (1.7 bar)

1289HH

45 to 75 psig

(3.1 to 5.2 bar)

1D745527142

75 psig (5.2 bar)

100 psig (6.9 bar)

3/4 or 1

1

1. With highest spring range available.
2. Maximum relief pressure setting plus buildup.

Installation
The 289 Series relief valves may be installed in anyposition. However, the outlet connection must beprotected against the entrance of rain, snow, insects, or
any other foreign material that may plug the outlet or
affect the opening and closing of the valve (see figure5). If it is necessary to pipe away the outlet, remove theoutlet screen (if one is present).
Flow through the valve must be as indicated by the flow
direction arrow on the body (inlet connection is marked
on some sizes).
The spring case vent on the 2-inch Type 289H is tappedand plugged. This vent opening must remain plugged toallow the pitot tube booster to function.

accumulated gas. Check the system for damage if anyof the maximum allowable relief (inlet) pressure ratings
in table 1 are exceeded.

Ordering Information
When ordering, specify:
1. Type number and size
2. Relief pressure range and setting desired
3. Type of gas (natural gas, air, etc.); list any factors
such as impurities in the gas that may affect compatibility of the gas with valve trim parts
4. Temperature and specific gravity of the gas
5. Maximum relief (inlet) pressure and flow rate desired
6. Line size and end connection size of adjacent pipingOverpressure
Overpressure conditions in a regulating system maycause personal injury or equipment damage due tobursting of pressure-containing parts or explosion of

7. For Types 289H and 289HH, specify material ofdiaphragm and O-ring seat; for 2-inch Type 289H,
specify material of orifice and pitot tube
8. Options desired, if any

7Bulletin 71.4:289
PROTECTIVE VENT PIPE
WITH RAIN CAP

2”TYPE 289H
RELIEF VALVELARGE SERVICEREGULATOR
AJ4698-C
A1947-1

Figure 5. Typical Installation of a 289 Series Relief Valve

4.88
(124)

3.06D(77.7)
5.38(137)2.25
0.38 (57.2)(9.7)

1.25(32)

1/4-18 NPT

1.94(50)
TYPE 289A AND 289U (1/4-INCH)

TYPE 289L (3/4 AND 1-INCH)
INCHES(mm)7.12(181)

4.12(105)

0.38(10)

8.69(221)

8.94(228)

2.12(54)

1.78(46)

11B6509-B
AL5113-B
AF8621-F
AU2493-B
A1393-2

1.88(48)

3.56(91)

TYPE 289H AND 289HH (1-INCH)

TYPE 289H (2-INCH)

Figure 6. Dimensions©Fisher Controls International, Inc., 1970, 1990; 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.

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