In some areas of the world, regulators periodically operate in temperatures below -20°F (-29°C). These cold temperatures require special construction materials to prevent regulator failure. Emerson Process Management Regulator Technologies offers regulator constructions that are RATED for use in service temperatures below -20°F (-29°C).

Selection Criteria

When selecting a regulator for extreme cold temperature service, the following guidelines should be considered:

• The body material should be 300 Series stainless steel, LCC, or LCB due to low carbon or zero carbon content in the material makeup.

• Give attention to the casting bolts used. Generally, special stainless steel bolting is required.

• Gaskets and O-rings may need to be addressed if providing a seal between two parts exposed to the cold.

• Special springs may be required in order to prevent fracture when exposed to extreme cold.

Soft parts in the regulator that are also being used as a seal gasket between two metal parts (such as a diaphragm) may need special consideration. Alternate diaphragm materials should be used to prevent leakage caused by hardening and stiffening of the standard materials.

Low Temperature Emerson Regulators

The following Emerson regulators have constructions readily available that are rated for use at temperatures below -20°F (-29°C):

• 1301 Series
• 627 Series
• Type 630
• 95 Series
• Type 1098-EGR

Please consult your local Sales Office for more information on regulators for cold temperature applications.