These valves are unidirectional valves made in bronze and with seals in oil-resistant rubber.

Their function in a vacuum circuit is of auto check. When fitted on the vacuum pumps suction inlets, when the pumps stop, they prevent the air returning through the pump (this is a cause of considerable damages due to the oil returning in the pump stator) to the plant brought to vacuum (pipelines, tanks, autoclaves etc.)

Technical Data Sheet