Circle Seal Controls manufactures and markets a variety of control valves and regulators for industrial instrumentation, OEM, and aerospace/military markets. For over fifty years Circle Seal Controls has developed products that have set the pace in high quality check valves, relief valves, soleniod valves, regulators, manifolds, and instrumentation valves. Circle Seal Controls offers a complement of Engineering, Manufacturing, Quality Control, and Marketing capabilities to assist designing and manufacturing in new applications.