IDA-72 DSV and Hoses

The DSV and hoses are unique to this rebreather, a major departure from normal Russian design, which uses standard components in many systems. At first glance the breathing hoses are massive, but this is the result of their double wall construction, as they are hot water heated.

This is the hot water heating supply hose, taking hot water from the inhalation side of the breathing plenum and supplying it to the breathing hoses. This keeps the inspired gas warm enough to prevent hypothermia in conditions of extreme cold.

The hot water flows along the length of the hose, and then exhausts to the sea at the DSV through these ports.

The DSV itself is plastic, with large diameter ports, as would be expected in a piece of equipment designed for heavy work at extreme depths.

The inhale side of the DSV is designed to thread to a divers helmet or full-face mask. I'm tooling up an adapter to a standard mouthpiece for this now.

Unlike all other Russian DSV's, this one uses conventional rubber flapper valves, and not sprung mica plates. The design of the flapper retainer is carefully engineered to prevent a flapper from rolling over and failing to control gas flow in the desired direction.

This is the exhaust side of the dual flapper assembly.

I took the opportunity to remove the outer sheath from one of the breathing hoses and this is what I found. The actual breathing hose is of large diameter, and has a stainless steel spring wound around it on the first foot of the hose nearest the rebreather to prevent kinking of the hose. By comparison you can see the diameter of the assembled hose with hot water sheath as compared to the internal breathing hose.

Here's a detail of the connection to the rebreather, as well as the stainless steel spiral around the hose.

Peering down into the inhale hose connection to the plenum, we can see that it's not just a simple water jacket, but that the hot-water feeds a radiator system to efficiently heat the gas. The Russians took a lot of time looking to assist the divers thermal needs, and I must say that this is the most sophisticated system incorporated into any rebreather I have ever seen to accomplish this goal.

And lastly, here is the hot water supply hose feeding the inhale hose with heating water.

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	The DSV and hoses are unique to this rebreather, a major departure from normal Russian design, which uses standard components in many systems. At first glance the breathing hoses are massive, but this is the result of their double wall construction, as they are hot water heated.
	This is the hot water heating supply hose, taking hot water from the inhalation side of the breathing plenum and supplying it to the breathing hoses. This keeps the inspired gas warm enough to prevent hypothermia in conditions of extreme cold.
	The hot water flows along the length of the hose, and then exhausts to the sea at the DSV through these ports.
	The DSV itself is plastic, with large diameter ports, as would be expected in a piece of equipment designed for heavy work at extreme depths.
	The inhale side of the DSV is designed to thread to a divers helmet or full-face mask. I'm tooling up an adapter to a standard mouthpiece for this now.
	Unlike all other Russian DSV's, this one uses conventional rubber flapper valves, and not sprung mica plates. The design of the flapper retainer is carefully engineered to prevent a flapper from rolling over and failing to control gas flow in the desired direction.
	This is the exhaust side of the dual flapper assembly.
	I took the opportunity to remove the outer sheath from one of the breathing hoses and this is what I found. The actual breathing hose is of large diameter, and has a stainless steel spring wound around it on the first foot of the hose nearest the rebreather to prevent kinking of the hose. By comparison you can see the diameter of the assembled hose with hot water sheath as compared to the internal breathing hose.
	Here's a detail of the connection to the rebreather, as well as the stainless steel spiral around the hose.
	Peering down into the inhale hose connection to the plenum, we can see that it's not just a simple water jacket, but that the hot-water feeds a radiator system to efficiently heat the gas. The Russians took a lot of time looking to assist the divers thermal needs, and I must say that this is the most sophisticated system incorporated into any rebreather I have ever seen to accomplish this goal.
	And lastly, here is the hot water supply hose feeding the inhale hose with heating water.