OB-30/31 Direct-Acting Temperature Regulators


For steam, air and non-corrosive liquids

The Armstrong OB-30/31 is a direct-acting
temperature regulator that requires no external source for operation.
Simple and compact, the unit is suitable for a wide variety of
heating/cooling applications. Installing, adjusting or maintaining the
OB-30/31 is quick and easy, because interchangeable capillaries mount in
any position and disconnect by simply loosening the union nut. No stem
packing, so there’s no leakage. Single composition seat for tight
shutoff. The OB-30/31 comes in 1/2″, 3/4″ or 1″ (15–25 mm) sizes and is
available with a choice of five temperature ranges and three capillary

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OB-30/31 Direct-Acting Temperature Regulators

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