|
|
Valve Type |
DEMAND |
Adjustment |
VENTURI SWITCH |
|
PNEUMATIC |
Integrated Purge Button |
YES |
Mouthpiece |
ORTHODONTIC |
Nitrox Compatibility |
STANDARD TO 40% |
Ambidextrous |
NO |
Integrated Swivel |
NO |
Weight (without hose) |
5.4 OUNCES |
Dimensions (front profile) |
2.67 INCHES |
First Stage Configuration |
ATMOS |
Minimum Cracking Effort |
DIVER ADJUSTABLE |
Factory Set Inhalation Effort |
0.0 - 2.5 CIW* |
|
.90 JOULES |
Warranty |
2 YEAR / LIFETIME PARTS |
FEATURES & FUNCTIONS |
AT400 FIRST STAGE |
Valve Type |
BALANCED DIAPHRAGM |
Primary Material |
MARINE BRASS |
Low Pressure Ports |
4 |
High Pressure Ports |
2 |
Integrated Swivel |
NO |
Nitrox Compatibility |
STANDARD TO 40% |
300 BAR DIN Fitting |
OPTIONAL |
Sealed Valve Design |
YES |
Environmental Protection |
YES |
Weight |
29 OUNCES |
Factory Set Intermediate Pressure |
138-143 PSI |
DVT (Dry Valve Technology) |
YES |
Warranty |
2 YEAR / LIFETIME PARTS |
STANDARD DOWNSTREAM DEMAND VALVE
Did you know that it costs energy to breathe? The amount of energy your regulator requires to move each liter of air is called work of breathing (WOB). Lower work of breathing equals lower effort required to breathe and increased comfort and safety during a dive.
(A) The spring force must be greater
than the downstream air pressure
to close the valve.
(B) The diver must overcome this spring
force to open the valve.
PNEUMATICALLY BALANCED DOWNSTREAM DEMAND VALVE
Did you know that it costs energy to breathe? The amount of energy your regulator requires to move each liter of air is called work of breathing (WOB). Lower work of breathing equals lower effort required to breathe and increased comfort and safety during a dive.
(A) The spring force must be just
enough to overcome the difference between downstream air pressure and upstream balance chamber pressure.
(B) The downstream air travels through a
hole in the poppet into the balance
chamber and applies an "upstream"
force just slightly less than the
downstream force.
(C) The size and force of the spring is
considerably less than that used in a
standard demand valve, leading to
less effort required by the diver to
open the valve and initiate air flow.
WORK OF BREATHING
Did you know that it costs energy to breathe? The amount of energy your regulator requires to move each liter of air is called work of breathing (WOB). Lower work of breathing equals lower effort required to breathe and increased comfort and safety during a dive.
How to Read Work of Breathing Charts
The computer-generated breathing machine chart presented above represents a regulator's performance per standards established by the U.S. Navy's Experimental Diving Unit. Tests are conducted at 198 feet with approximately 3000-psi supply pressure, 25 breaths per minute of 2.5 liters each.
(1) Inhalation - The chart shows one complete breath cycle, starting with inhalation on the left and continuing along the bottom to the right, staying mostly below 0.0; thus the inhalation work of breathing is reported in negative numbers.
(2) Exhalation - The exhalation effort begins on the right and runs across the top to the left. These are all positive numbers since a diver (or the machine in this case) is blowing out (exhaling) rather than inhaling.
(3) WOB - The total area inside the loop formed by the two lines is what the computer analyzes to calculate the regulator's total work of breathing - the amount of energy the regulator requires to move each liter of air.
*Column Inches of Water
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