First Stage Technology Second Stage Technology First Stage Technology Second Stage Technology First Stage Technology Over-balanced Diaphragm Design The heart of any regulator is the first stage. Most Apeks first stages utilise a unique over-balanced diaphragm design. In an over-balanced first stage design, the inter-stage pressure in the hose increases faster than traditional balanced models as a diver descends to greater depths. This increased inter-stage pressure compensates for the increased density of your breathing gas by allowing a larger volume of gas to flow through the system on demand. The result is superior breathing performance regardless of depth. The over-balanced diaphragm design is found on Apeks Tungsten, XTX200, XTX100, XTX50, XTX40 and XTX50/DS4 first stages. Environmental Dry Sealing System Standard on most Apeks first stages is the unique Environmental Dry Sealing System. This system serves a number of purposes, including the prevention of ice build up on the main spring that can occur when diving in extremely cold water. Dry sealing the first stage also acts as a safeguard against the entry of contaminants and silt into the main spring chamber, and eliminates the need for messy silicone oil or grease filling inside your regulator. The Environmental Dry Sealing system is found on Apeks Tungsten, XTX200, XTX100, XTX50, XTX40 and XTX50/DS4 first stages. Second Stage Technology Pneumatically Balanced 2nd Stages In most other regulator brand’s second stage designs, the inhalation effort of the diver opens a valve inside the regulator that is held closed by spring tension. Apeks second stages feature a pneumatically balanced valve system which means that the pressure on the second stage valve is "balanced" by allowing medium pressure air to pass through to the opposite side of the valve to help counteract the force of the spring. This reduces the inhalation effort required to open the second stage valve and substantially improves the overall ease of breathing in all diving conditions. This means that a dive on an Apeks regulator is a far superior breathing experience to that of other competing regulators. Reversible Regulator The Apeks XTX range of regulators can be dedicated to either left or right-handed use. While supplied in a right hand configuration, the hose routing can be altered from right to left or left to right by an Authorised Apeks Service Technician. This extremely useful feature offers greater flexibility for those who like to configure their kit in a particular way and sets Apeks regulators apart from other brands of regulators. The Apeks Reversible Venturi System (RVS) The Apeks Reversible Venturi System (RVS) allows the diver to control the venturi assist with greater precision due to indexable Venturi Lever. Gas flow to the diver can be directed towards the mouthpiece by indexing the venturi lever towards the plus position. This allows the diver an assisted breathe resulting in a more comfortable dive with less breathing effort. With the venturi lever in the minus position, the air-flow in the second stage is directed onto the diaphragm, closing the valve and preventing freeflow.The Indexable Venturi Lever can therefore act as a pre dive switch. When set in the minus position the second stage will not freeflow during the entry phase or if the regulator is dropped in the water. When the diver begins to use the regulator the venturi lever can be indexed toward the plus position and the second stage will give the diver an assisted breathe resulting in a more comfortable dive with less breathing effort. Due to its unique design, the venturi lever can be moved to either the left or the right side of the regulator, depending on the desired hose configuration, this work must be carried out by an authorized Apeks service centre. Diver Changeable Exhaust System. The Diver Changeable Exhaust (DCE) offers user the choice of either a compact, light-weight exhaust tee on the second stage or a wider exhaust. By using the wider exhaust, bubble interference can be avoided, perfect for photographers who wish to virtually eliminate exhaled air interfering with capturing the perfect image. The exhaust diffusers can be easily and quickly changed by sliding and locking the preferred set into place. Divers can now configure their own regulator exhaust diffusers for individual dive conditions or requirements.