Blind flanges and counter flanges are essential end components for the safe and leak-tight closure of high-pressure hydraulic systems. Their main function is to isolate specific sections of the system, preventing hydraulic fluid leakage and allowing scheduled maintenance, testing operations or future system expansion without the need to drain the entire circuit. Compared with traditional threaded closures, these solutions provide significantly greater structural resistance to pressure peaks, water hammer and severe vibrations, while ensuring proper O-ring gasket preload at all times.
Depending on the applicable dimensional specifications, such as SAE J518 or ISO 6162 standards, and the maximum operating pressures, typically divided into 3000 PSI and 6000 PSI series, it is essential to select the component best suited to the system layout. For permanently sealing open flanged connections with a structurally robust solution, Oleo Tecnica blind flanges are the preferred choice, ensuring maximum mechanical sealing performance. When the system instead requires direct coupling with an existing flange in order to stop the flow through the line, Oleo Tecnica blind counter flanges provide fast, reliable isolation in full compliance with applicable safety standards.
These end components are widely used across a range of heavy industrial applications. They are commonly employed in steel plants, earthmoving machinery, hydraulic press construction and hydraulic power units as provision points for future connections. The use of high-strength steels ensures long-term durability, ease of inspection and the maintenance of the highest safety standards required by modern hydraulic systems.