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Valves / Manifolds


There's a large number of dive cylinder valves out there, and getting the right one for your needs can be daunting. The Scuba Doctor dive shop has a large range to chose from and have we tried to make it easier for you with detailed info about each type of valve.

Left and Right Scuba Cylinder Valves

Left and Right Scuba Cylinder Valves

A Left valve is the typical/common/standard valve orientation used by recreational scuba divers using one cylinder. The valve opening and closing stem and hand-wheel are on the left side as you look at the valve outlet. It's also popular for use on side mount setups on the diver's left side, and for the OXYGEN cylinder on rebreathers.

A Right valve is the atypical/uncommon/non-standard valve orientation often used on the second cylinder of sidemount divers and twin cylinder technical divers. The valve opening and closing stem and hand-wheel are on the right side as you look at the valve outlet. It's popular for use on sidemount setups on the diver's right side, and opposite side stage bottles to keep the valves facing in the same direction, while keeping hand-wheels on opposite sides. It's also commonly used for the DILUENT cylinder on rebreathers.

Please Note: Be careful to properly specify whether you need a left or right valve by stating the orientation. Some manufacturers use the opposite names for their left and right valves, just to confuse everyone.

Valve Threads and Cylinder Neck Threads

!!! IMPORTANT !!! Cylinders and valve threads come in a variety of sizes and great care must be taken to ensure that you are fitting the valve to the correct cylinder. The valve thread specification must exactly match the neck thread specification of the cylinder. Improperly matched neck threads can fail under pressure and can have fatal consequences if someone is hit by the flying valve or cylinder. Only qualified scuba servicing professionals should be installing this equipment. Please ensure you have the training and experience required before purchasing this item if you intend to fit it yourself. If you are unsure, please call your local scuba technician to provide appropriate information for your system.

Australian Standard Diving Cylinder Valve Thread
Most Australian Standard aluminium and steel tanks/cylinders/bottles use a standard 3/4-inch NPSM (NGS) parallel thread, sealed by an O-ring, which has a 60° thread form, a pitch diameter of 0.9820 to 0.9873 in (24.94 to 25.08 mm), and a pitch of 14 threads per inch (5.5 threads per cm). It is torqued to 40 to 50 N·m (30 to 37 lbf·ft) on aluminium cylinders.

European Diving Cylinder Valve Threads
On most steel and aluminium diving cylinders in Europe the M25X2 ISO parallel thread, which is sealed by an O-ring and torqued to 100 to 130 N·m (74 to 96 lbf·ft) on steel, and 95 to 130 N·m (70 to 96 lbf·ft) on aluminium cylinders, is now commonly used. (M25 means the diameter of the thread is 25 mm and the X2 defines the 2 mm pitch of the thread.) On smaller cylinders where the neck isn't large enough for the M25X2 thread a M18x1.5 parallel thread, which is sealed by an O-ring, and torqued to 100 to 130 N·m (74 to 96 lbf·ft) on steel cylinders, and 85 to 100 N·m (63 to 74 lbf·ft) on aluminium cylinders is used.

Please Note: The M25X2 metric thread valves are only for use with metric M25X2 threaded cylinders. While they can be wound into a cylinder/tank with a 3/4 inch NPSM threaded neck, they will not seal properly and the combination can be very dangerous. Do not try and use these M25X2 valves on typical Faber, Catalina, Luxfer etc. cylinders purchased in Australia.

When someone tries to fit a M25 valve into a 3/4-inch BSP cylinder thread, they will get it to seal, but only after damaging the brass threads on the valve. This produces an unstable fitting which can result in the valve coming out with an incredible force that could seriously injure someone, or even kill. You have been warned.

All parallel thread valves are sealed using an O-ring at top of the neck thread which seals in a chamfer or step in the cylinder neck and against the flange of the valve.

Valve to Regulator Connection

There are two basic types of cylinder valve to regulator connection in general use for Scuba cylinders containing air:

  • DIN Screw Thread Connectors — the regulator screws into the cylinder valve trapping the O-ring securely between the sealing face of the valve and the O-ring groove in the regulator. These are more reliable than A-clamps because the O-ring is well protected, but many countries do not use DIN fittings widely on compressors, or cylinders which have DIN fittings, so a diver travelling abroad with a DIN system may need to take an adaptor, either for connecting the DIN regulator to a rented cylinder, or for connecting an A-clamp filler hose to a DIN cylinder valve. We strongly recommend DIN connectors, as they are safer, which is why they are almost always used by technical divers.
     
  • A-clamp or Yoke Connectors — the connection on the regulator surrounds the valve pillar and presses the output O-ring of the pillar valve against the input seat of the regulator. The connection is officially described as connection CGA 850 yoke. The yoke is screwed down snug by hand (over tightening can make the yoke impossible to remove later without tools) and the seal is created by clamping the O-ring between the surfaces of the regulator and valve. When the valve is opened, cylinder pressure expands the O-ring against the outer surface of the O-ring groove in the valve. Insufficient clamping force may allow the pressure to extrude the O-ring between the valve and regulator faces, resulting in a leak. This type of connection is simple, cheap and very widely used worldwide. It has a maximum pressure rating of 232 bar and the weakest part of the seal, the O-ring, is not well protected from over pressurisation.

In Europe there is now a standard for cylinder valves for scuba cylinders containing gases other than air:

  • The new European Norm EN 144-3:2003 introduced a new type of valve, similar to existing 232 bar or 300 bar DIN valves, however, with a metric M26X2 fitting on both the cylinder and the regulator. These are intended to be used for breathing gas with oxygen content above that normally found in natural air in the Earth's atmosphere (i.e. 22–100%).

Most of the 200 to 240 bar valves supplied in Australia are a DIN/K convertible valve. They are made with a DIN regulator connection, but such that a DIN plug adaptor can be screwed into the DIN outlet so that an A-clamp or Yoke regulator can be connected to the valve.

Valve Pressure Rating

Yoke valves are rated between 200 and 240 bar, and there does not appear to be any mechanical design detail preventing connection between any yoke fittings, though some older yoke clamps will not fit over the popular 232/240 bar combination DIN/yoke cylinder valve as the yoke is too narrow.

DIN valves are produced in 200 bar and 300 bar pressure ratings. The number of threads and the detail configuration of the connections are designed to prevent incompatible combinations of filler attachment or regulator attachment with the cylinder valve.

  • 232 bar DIN (5-thread, G5/8) Outlet/Connector #13 to DIN 477 part 1 - (technically they are specified for cylinders with 300 bar test pressure)
  • 300 bar DIN (7-thread, G5/8) Outlet/Connector #56 to DIN 477 part 5 - these are similar to 5-thread DIN fitting but are rated to 300 bar working pressures. (technically they are specified for cylinders with 450 bar test pressure). The 300 bar pressures are common in European diving and in US cave diving.

Adaptors are available to allow connection of yoke regulators to DIN cylinder valves. These plug adaptors (or inserts) are rated for 200-240 bar, and can only be used with valves which are designed to accept them.

Valve Bursting Disk

Australian standards require that the cylinder valve includes a bursting disk, a pressure relief device that will release the gas before the cylinder fails in the event of over pressurisation. If a bursting disk ruptures during a dive the entire contents of the cylinder will be lost in a very short time. The risk of this happening to a correctly rated disc, in good condition, on a correctly filled cylinder is very low.



Entrance Deep

Other Other | Boat access Boat access

Deep Rated Inside Port Phillip Reef Dive Site Slack Water Subject to Shipping Technical Rated

Depth: 30 m (98 ft) to 103 m (338 ft)

Entrance Deep is the very deepest dive spot known of anywhere in Victoria, being the bottom of the ancient River Yarra just inside the Port Phillip Heads in the main shipping channel.

The actual Entrance Deep spot where 103 metres deep has been reached is just 5-metres square. It takes incredible luck to get a shot line down 103 metres into this small 5-metre by 5-metre square target.

Some divers have located this spot by entering at Trimix Corner and descending down the wall looking for the deepest spot they can find. This approach is not always successful.

At 103 metres deep this is not a dive for the faint-hearted. It's very black, barren and rocky, with incredibly treacherous currents. The ascent must be started while the tide is still coming in, slack water is very short, and the ascent must be back up the shot for as long as possible as the outgoing tide will quickly push you back over Rip Bank with a minimum depth of 20 metres. Pick up will be outside Port Phillip Heads.

See also, Herald Sun: Divers find life at bottom of Port Phillip Bay.

Bass Strait Warning: Always keep an eye on sea conditions throughout any shore or boat dive in Bass Strait on Victoria's coastline. Please read the warnings on the web page diving-in-bass-strait before diving or snorkelling this site.

The Rip & Tides Warning: Always keep an eye on sea conditions throughout any shore or boat dive within "The Rip" (aka "The Heads"). This is a dangerous stretch of water, where Bass Straight meets Port Phillip, which has claimed many ships and lives. Please read the warnings on the web page diving-the-rip before diving or snorkelling this site.

Wathaurong (Wadda-Warrung) country
Wathaurong (Wadda-Warrung) country

Traditional Owners — This dive site is in the traditional Country of the Wathaurong (Wadda-Warrung) people of the Kulin Nation. This truly ancient Country includes the coastline of Port Phillip, from the Werribee River in the north-east, the Bellarine Peninsula, and down to Cape Otway in the south-west. We wish to acknowledge the Wathaurong as Traditional Owners. We pay respect to their Ancestors and their Elders, past, present and emerging. We acknowledge Bunjil the Creator Spirit of this beautiful land, who travels as an eagle, and Waarn, who protects the waterways and travels as a crow, and thank them for continuing to watch over this Country today and beyond.

 

Entrance Deep Location Map

Latitude: 38° 17.794′ S   (38.296567° S / 38° 17′ 47.64″ S)
Longitude: 144° 37.854′ E   (144.6309° E / 144° 37′ 51.24″ E)

Datum: WGS84 | Google Map
Added: 2012-07-22 09:00:00 GMT, Last updated: 2022-04-06 19:16:16 GMT
Source: GPS
Nearest Neighbour: The Plateau, 366 m, bearing 28°, NNE
Depth: 30 to 103 m.
Dive only on: SWF.



DISCLAIMER: No claim is made by The Scuba Doctor as to the accuracy of the dive site coordinates listed here. Should anyone decide to use these GPS marks to locate and dive on a site, they do so entirely at their own risk. Always verify against other sources.

The marks come from numerous sources including commercial operators, independent dive clubs, reference works, and active divers. Some are known to be accurate, while others may not be. Some GPS marks may even have come from maps using the AGD66 datum, and thus may need be converted to the WGS84 datum. To distinguish between the possible accuracy of the dive site marks, we've tried to give each mark a source of GPS, Google Earth, or unknown.

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