Dual Algorithm Technology

Pneumatically Balanced Valve

The pneumatically balanced second stage reduces breathing resistance to near zero with a balanced valve seat designed to respond to the slightest inhalation.

A pneumatically balanced second stage actually has (or can have) the same initial crack opening effort as a mechanically balanced, but the spring force of a pneumatically balanced second stage is lighter so it’s spring rate is also lower.


Therefore the force required to open the valve farther as flow increases is less than that required for a mechanically balanced second stage with a higher rate spring. So the total effort to breathe the pneumatically balanced second stage is indeed less.

The spring force must be just enough to overcome the difference between downstream air pressure and upstream balance chamber pressure.

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.

Dual Algorithm Technology

Diver Adjustable Inhalation Effort

 A simple twist of the adjustment knob enables complete control...

Set the inhalation requirement to near zero when you need ultimate performance, or tune it for greater resistance as conditions or preferences change.


repetitive deep and decrompression dive profile

Most downstream demand valve regulators are calibrated during manufacturing to a single, 'middle of the road' operation. Whether finning up current at 100+ feet or merely snorkeling out to the dive site, this factory adjustment may not be optimum for the wide variety of demands we place on our equipment.