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Reviews for ScubaPro R190 Octo: • Ideal Secondary Air Supply With Neon Yellow Case For High Visibility • Extra-Long 39” Hose • Classic Downstream Valve • Diver-Adjustable VIVA • Reversible LP Hose Attachment • Ergonomic, Safe-Grip Mouthpiece SchematicClassic Downstream Valve Classic Downstream Valve second stages are particularly noted for their legendary safety and reliability. In operation, a downstream valve opens in the same direction as the incoming air flow from the first stage. This incoming air exerts a force on the end of the poppet that pushes the valve into the open position (downstream). This force is counteracted by a spring that pushes the poppet in the opposite direction (upstream) toward the closed position. Inhalation effort required to open a downstream valve is directly proportional to the resistance of this spring.
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