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IDA-71 Hoses and DSV

The basic hose and DSV set is a perfect example of the Russian "One Design Does All" method of design philosophy. The internal components and basic design is identical to the DSV or 2-hose regulator mouthpiece found on all Russian rebreather and SCUBA assemblies.

The hoses themselves are of rubber-lined, reinforced fabric construction. The white rings seen for the first few inches of the length close to the rebreather connections are anti-collapse rings. The connections to the counterlung are heavy chrome-plated brass, attached to the hose with a heavy-duty brass clamp covered with a rubber ring for abrasion protection.

The DSV itself is also chrome-plated brass, with a good finish. The two positions are labeled, and translate to "Apparatus" and "Atmosphere". In the atmosphere position, the diver would draw air in through the small port located on the top of the valve. At first, the angle of the hose attachment to the valve seems peculiar, however in use the angle makes perfect sense, keeping the breathing hoses close to the shoulders. The harness of the IDA-71 has small straps to hold the breathing hoses down, and this relieves any mouth-strain due to the buoyancy of the hoses themselves.

Like all Russian DSV's, the one-way valve assemblies need special mention. The actual sealing-flappers are made of a clear material, that has been reported to be Mica. They are held in place by this very well made stainless steel spring assembly. This has two advantages: Very low (and predictable) cracking effort, and absolute prevention of any dry-rot of the assembly. This is surely the most expensive way to design a DSV, and the system works perfectly.

The DSV was not originally designed to be used with a mouthpiece, but rather with any of a few different types of full face masks. This is the reason for the "Atmosphere" position of the DSV.

On the original Russian FFM, the diver bites a conventional mouthpiece in order to reduce the dead-space in the mask. This assembly may be removed and used to hold any normal mouthpiece to the DSV. We are also duplicating the mouthpiece attachment assembly in Delrin, as they will be lighter and more streamlined than the assembly as removed from the mask.

An alternative method to use a standard mouthpiece is to simply stretch one over the DSV. It's best to use a mouthpiece that's soft and which has a larger than standard opening. I use a Poseidon Cyklon-5000 mouthpiece, as shown here, with good results.

Continue the Tour with the Internal Components

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	The basic hose and DSV set is a perfect example of the Russian "One Design Does All" method of design philosophy. The internal components and basic design is identical to the DSV or 2-hose regulator mouthpiece found on all Russian rebreather and SCUBA assemblies.
	The hoses themselves are of rubber-lined, reinforced fabric construction. The white rings seen for the first few inches of the length close to the rebreather connections are anti-collapse rings. The connections to the counterlung are heavy chrome-plated brass, attached to the hose with a heavy-duty brass clamp covered with a rubber ring for abrasion protection.
	The DSV itself is also chrome-plated brass, with a good finish. The two positions are labeled, and translate to "Apparatus" and "Atmosphere". In the atmosphere position, the diver would draw air in through the small port located on the top of the valve. At first, the angle of the hose attachment to the valve seems peculiar, however in use the angle makes perfect sense, keeping the breathing hoses close to the shoulders. The harness of the IDA-71 has small straps to hold the breathing hoses down, and this relieves any mouth-strain due to the buoyancy of the hoses themselves.
	Like all Russian DSV's, the one-way valve assemblies need special mention. The actual sealing-flappers are made of a clear material, that has been reported to be Mica. They are held in place by this very well made stainless steel spring assembly. This has two advantages: Very low (and predictable) cracking effort, and absolute prevention of any dry-rot of the assembly. This is surely the most expensive way to design a DSV, and the system works perfectly.
	The DSV was not originally designed to be used with a mouthpiece, but rather with any of a few different types of full face masks. This is the reason for the "Atmosphere" position of the DSV.
	On the original Russian FFM, the diver bites a conventional mouthpiece in order to reduce the dead-space in the mask. This assembly may be removed and used to hold any normal mouthpiece to the DSV. We are also duplicating the mouthpiece attachment assembly in Delrin, as they will be lighter and more streamlined than the assembly as removed from the mask.
	An alternative method to use a standard mouthpiece is to simply stretch one over the DSV. It's best to use a mouthpiece that's soft and which has a larger than standard opening. I use a Poseidon Cyklon-5000 mouthpiece, as shown here, with good results.