Apeks technical informatiom
24 June 2017   
Features

Apeks Technical - FSR Balanced First Stage Operation

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As the air is turned on, it flows through the first stage (shown by the arrows) and through the hose to the second stage. When the pressure builds to 9.5 bar, it exerts sufficient load on the primary diaphragm to compress the large spring. This allows the smaller spring to push the high pressure (H.P.) Valve onto its seat.The valve is then in a balanced state with the medium pressure pushing on the diaphragm, holding the large spring compressed, while the H.P. valve is being held onto the seat by the smaller spring, preventing the H.P. air flowing.
As the diver inhales, the medium pressure air (9.5 bar) acting on the diaphragm drops, allowing the large spring to push the diaphragm. In turn this then pushes the H.P. valve off its seat, allowing more air to flow from the high pressure side until the diver stops inhaling. Medium pressure builds up once more to 9.5 bar, returning the first stage to its balanced state.
The first stage is protected from freezing and contamination by a secondary diaphragm. This second diaphragm also maintains hydrostatic balance by transmitting the pressure of the water via the load transmitter to the primary diaphragm. By this method medium pressure of 9.5 bar is always maintained above the water pressure, ensuring that second stage supply is always sufficient regardless of depth.

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