Dresser Masoneilan is an international leader in the design, manufacture and support of final process control elements and solutions. Major product lines include reciprocating, rotary and severe service control valves, regulators, levels and field instrumentation. It is an integral part of Dresser Measurement, which provides a wide range of valve products serving all phases of the energy industry. Industries in which Dresser Masoneilan products are used include aerospace; chemical; oil and gas; petrochemical; power, pulp and paper; and refining. Dresser Masoneilan is located in Avon, Mass, and has approximately 250 employees.