Profile: Masoneilan designs, manufactures and support final process control elements and solutions. Our product lines include reciprocating, rotary, and severe service control valves, regulators, levels and field instrumentation. We are an integral part of Dresser flow control, which provides a wide range of valve products serving all phases of the energy industry. Our products are used in aerospace, chemical, oil & gas, petrochemical, power, pulp & paper and refining industries.