The Spence Engineering Company was founded in 1926 by Paulsen Spence in Walden, New York. Paulsen Spence developed the original patent for the normally closed external pilot operated packless pressure regulator. This design is the basis for the products offered today. This technology offers the maximum in application and selection flexibility. Spence stands alone in their ability to produce regulators up to 12 inches in cast iron and cast steel. Their pilots are used to control pressure, temperature, differential pressure or back pressure either mechanically or with a pneumatic pilot.

Spence Engineering is a widely recognized leader in the steam regulator and flow control field. Spence regulators are used extensively for heating systems in buildings, institutions and district heating systems as well as major industrial plants.

In 1984, Spence Engineering was acquired by Watts Industries. The company continued to grow and develop new fluid control and steam specialty products. A new line of pneumatic control valves was introduced in 1986. In 1989, a range of self contained temperature regulators was added to the line to meet the demand for an economical temperature regulator.

1990 was an active year, with Spence becoming certified by the ASME for the assembly and setting of safety relief valves manufactured by their sister Watts company in Canada. Spence was also instrumental in the acquisition and management of the Nicholson Steam Trap Company. In 1994, Nicholson was integrated into the Spence Plant.

Spence continued it's product development program with the introduction of free float steam traps and pressure operated condensate pumps. In 1996, Watts moved the manufacturing responsibility for safety valves to the Spence Engineering plant in Walden, New York. Spence is now an ASME certified manufacturer of bronze and iron safety relief valves.

Spence Engineering continues to focus their attention on providing single source steam specialty products for regulating and control of steam and fluids for the institutional and industrial marketplace. Their growth efforts are to expand the already comprehensive product capabilities to reach new developing markets.