Original oil and gas trade magazine vintage ad for ORBIT VALVE COMPANY of Tulsa, OK. Sure Way To Avoid Flowdowns. Xmas tree. Orbit Forged Steel Production Valves. Unique 1955 old oilfield petroleum industry equipment magazine advertisement. On the reverse side is an ad for AMERICAN BLOWER CORPORATION of Detroit, MI. Division of American Radiator and Standard Sanitary Corporation. Adjustable Speed Gyrol Fluid Drive Controls the Flow in Catalytic Reforming Processes. Shown is a 4000 hp, 1800 rpm, size 315 type VS, Class-6 Gyrol Fluid Drive equipped to automatically regulate the speed of a centrifugal compressor handling variable-density gases. American Blower products serve the petroleum industry. Air Conditioning, Heating, Ventilating Equipment, Mechanical Draft Equipment, Industrial Fans and Blowers, Centrifugal Compressors, Gyrol Fluid Drives. Unique 1955 old petroleum industry refinery equipment magazine advertisement.