Emerson 289 Series Instruction Manual - Page 2

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289 Series

Specifications

This section lists the specifications for the 289 Series regulators. Factory specification are stamped on

the nameplate fastened on the regulator at the factory.

Available Configurations

See Table 1

Body Sizes and Inlet Connections

Type 289L: 3/4 or 1 NPT Types

289A and 289U: 1/4 NPT Type

289H: 1 or 2 NPT

Type 289HH: 1 NPT

Maximum Allowable Relief (Inlet) Pressure

Maximum Relief Set Pressure

See Table 1

Material Temperature Capabilities

Nitrile (NBR) and Neoprene (CR):

-20 to 150° F / -29 to 66° C

Fluorocarbon (FKM)

(2)

20 to 300° F / -7 to 149° C

Available with Types 289H and 289HH only

1. The pressure/temperature limits in this Instruction Manual and any applicable standard limitation should not be exceeded.

2. Bubble-tight shutoff cannot be attained at settings below 5 psig / 0.34 bar with Fluorocarbon (FKM) O-ring seat.

Principle of Operation

Refer to Figures 2 and 4. The 289 Series Relief

valves are to be installed (between large service

regulators such as S202G or S302G Series) so the

outlet is piped downstream to relieve excess pressure

to the atmosphere. As inlet pressure increases, the

spring is compressed by the diaphragm, moving the

disk away from the seat. When the valve is opening,

high gas velocity through the orifice creates an area

of relatively low pressure near the end of the pitot

tube. This pitot tube effect forms a partial vacuum

above the diaphragm (spring case area) which helps

to open the valve further.

Installation

Warning

Installing a 289 Series relief valve where

its capabilities can be exceeded or where

proper operation might be impaired may

cause personal injury, property damage

or leakage due to bursting of pressure-

containing parts or explosion of

accumulated gas. To avoid such

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Pressure Setting Adjustment

Adjusting screw

Pressure Registration

Internal

Approximate Shipping Weights

Types 289A and 289U: 0.75 lbs / 0.3 kg

Type 289H:

1 NPT Size: 4 lbs / 2.0 kg

2 NPT Size: 15 lbs / 7.0 kg

Type 289HH: 4 lbs / 2.0 kg

Type 289L: 15 lbs / 7.0 kg

Additional Specifications

For construction materials, see Parts List.

conditions, install a 289 Series

relief valve where:

• Service conditions are within the

unit capabilities specified in the

Specifications section and

• The relief valve is protected from

exposure to physical damage and/or

corrosive substances.

1. When installing a 289 Series relief valve, make sure

that the installation of the system complies with

applicable local, state or federal codes or regulations.

2. Use qualified personnel when installing, operating

and maintaining a 289 Series relief valve. Before

installation, make sure there is no damage to

or foreign material in the relief valve and that

all piping is clean and unobstructed.

3. For installation of Types 289H, 289HH and

289L relief valves, the vent in the spring case

must remain plugged or undrilled in order for

the pitot tube to function properly.

4. The 289 Series relief valves may be installed in any

orientation. However, when installing the relief valve at

an outside location, adequate protection, such as rain

caps or elbow piping (see Figure 4), must be attached

to the outlet to keep the relief valve from getting

plugged or from collecting moisture, corrosive