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Features
The "Tri-material" valve is a patented innovation, conceived and
created to optimize performance, safety, and reliability over time for
Mares MRT first stages.
During operation, the high-pressure valve is subjected to various
stresses. In traditional valves, these stresses, combined with extreme
usage conditions, can cause premature wear of the valve with a
consequent drop in reliability, performance, and safety.
After careful study of the forces involved, the pressures that act on
the surfaces of the valve, and the usage conditions to which it is
subjected, Mares has created the new "Tri-material" valve (brass, soft
polyurethane, and "heavy duty" polyurethane), found today on all Mares
MRT first stages.
This innovative technical solution guarantees maximum performance,
safety, and durability for Mares first stages.
Mares is the only manufacturer in the world to offer a complete range of
regulators with the second stage cases produced entirely in metal;
anti-corrosion nickel and chrome-plated brass. In cold water, metal
second stages have superior performance and are safer than second stages
manufactured in plastic materials, thanks to the high thermal
conductivity that limits the freezing effect.
When inhaling, compressed air from the first stage expands inside the
second stage and creates an abrupt drop in the temperature of the air,
which in cold water can drop to a few degrees above freezing. This
situation, along with the natural humidity inside the second stage, can
cause ice crystals to form, and when on the demand lever, can result in
small air leaks and then trigger free-flow.
Metal is a good conductor of heat, and makes the water surrounding the
second stage act as a heating element for the air inside and prevents
this opportunity for free-flow.
Strange as it may seem, even at temperatures very close to the freezing
point, the water is still warmer than the air expanding inside the
second stage.
Additional benefits of "All Metal" Mares second stages are:
• Improved resistance to harsh conditions, rough treatment, and abrasion
• Longer working life of the product
• Less dry mouth, because the humidity of exhalations condenses on the
inner walls of the metal second stage and moisturizes every breath
Mares first stages are equipped with the exclusive DFC system, making it
possible to minimize intermediate pressure drop during inhalation,
demonstrably improving the regulator's performance in every condition,
including high demand situations. This means that the regulator remains
easy to breathe with, especially when you need it the most.
The DFC system, by guaranteeing more stable intermediate pressure, makes
it possible to use simpler, more reliable second stages.
Mares regulators do not require any type of manual adjustment of the
second stage, thanks to the consistency derived from first stages that
guarantee a stable flow of air, even under extreme conditions.
All Mares second stages offer the unique, patented, VAD system (Vortex
Assisted Design).
This unrivaled system eases breathing at all depths. The working
principal is very simple.
As air comes from the hose, it passes into the second stage and is
conveyed directly to the mouthpiece through the by-pass tube. A "vortex"
is created in the airflow as it enters the mouthpiece. In the center
of this swirling air is an area of a low-pressure.
This low pressure helps keep the second stage diaphragm down during
inhalation, thus increasing the regulator's sensitivity and minimizing
respiratory effort. Regulators with the VAD system, offer improved
performance and allow for very natural and comfortable breathing.
One of the main causes of ice forming in regulators is the expansion of
air inside the second stage case, which causes an abrupt drop in
temperature. With the VAD system, air expands inside the by-pass tube
and mouthpiece, reducing the likelihood of icing.
The mesh design of the second stage cover reduces the pressure of water
flowing onto the second stage diaphragm and minimizes free-flow, even in
strong currents (patented).
Mares developed the new “superflex” hose after many years of testing and
research. The results achieved far surpass the tests required by EN250,
and even the highly stringent additional tests Mares applies for use in
extreme conditions. Its exceptional softness and extremely light weight
guarantee the maximum freedom of movement.
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