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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.


San-o-Sub DIN/K Cylinder Valve - 232 bar
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub DIN/K Cylinder Valve - 232 bar

The San-o-Sub DIN/K Cylinder Valve is for use with both DIN and Yoke (K) regulator first stage fittings. The outlet on the cylinder valve is a...
$99.00
San-o-Sub DIN HP Cylinder Valve - 300 bar
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub DIN HP Cylinder Valve - 300 bar

This High Pressure DIN cross-flow valve is made by San-o-Sub , a leading Italian manufacturer of medical, industrial and scuba valves. They are...
$139.00
Ocean Design DIN/K Cylinder Valve - 207 bar
Category Path: CYLINDERS TANKS > Valves / Manifolds

Ocean Design DIN/K Cylinder Valve - 207 bar

The Ocean Design DIN/K Cylinder Valve is for use with both DIN and Yoke (K) regulator first stage fittings. The outlet on the cylinder valve is a...
$135.00
Ocean Design DIN/K Cylinder Valve - 230 bar
Category Path: CYLINDERS TANKS > Valves / Manifolds

Ocean Design DIN/K Cylinder Valve - 230 bar

The Ocean Design DIN/K Cylinder Valve is for use with both DIN and Yoke (K) regulator first stage fittings. The outlet on the cylinder valve is a...
$145.00
San-o-Sub DIN/K Sidemount Cylinder Valve - LEFT (232 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub DIN/K Sidemount Cylinder Valve - LEFT (232 bar)

The San-o-Sub Blue Steel DIN/K Sidemount Cylinder Left-sided Valve is for use with both DIN and Yoke (K) regulator first stage fittings. The outlet...
$103.00
San-o-Sub DIN/K Sidemount Cylinder Valve - RIGHT (232 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub DIN/K Sidemount Cylinder Valve - RIGHT (232 bar)

The San-o-Sub Blue Steel DIN/K Sidemount Cylinder Right-sided Valve is for use with both DIN and Yoke (K) regulator first stage fittings. The outlet...
$103.00
San-O-Sub Rebreather X Flow Inline Cylinder Valve (232 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-O-Sub Rebreather X Flow Inline Cylinder Valve (232 bar)

The San-O-Sub T profile X Flow valve is specifically designed to be used with Rebreather cylinders where compactness, low profile and accessibility...
$139.00
San-O-Sub Rebreather X Flow Inline Cylinder Valve (300 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-O-Sub Rebreather X Flow Inline Cylinder Valve (300 bar)

The San-O-Sub T profile 300 bar X Flow valve is specifically designed to be used with Rebreather cylinders where compactness, low profile and...
$149.00
Sonar Premium Rebreather In-Line Valve - BLACK (230 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Premium Rebreather In-Line Valve - BLACK (230 bar)

The Sonar Premium Rebreather In-Line 230 Bar Valve is an inline configuration popular with rebreather divers for use on their cylinders. The valves...
$129.00

Max: 1
Sonar Premium Rebreather In-Line Valve - BLACK (300 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Premium Rebreather In-Line Valve - BLACK (300 bar)

The Sonar Premium Rebreather In-Line 300 bar Valve inline configuration is popular with rebreather divers for use on their Diluent cylinders. The...
$129.00

Max: 5
Sonar Premium Rebreather In-Line Valve - GREEN (230 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Premium Rebreather In-Line Valve - GREEN (230 bar)

The Sonar Premium Rebreather In-Line 230 Bar Valve is an inline configuration popular with rebreather divers for use on their cylinders. The valves...
$129.00

Max: 1
Sonar Premium Rebreather In-Line Valve - GREEN (300 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Premium Rebreather In-Line Valve - GREEN (300 bar)

The Sonar Premium Rebreather In-Line 300 bar Valve inline configuration is popular with rebreather divers for use on their Diluent cylinders. The...
$129.00

Max: 1
OMS H-Valve Adapter Right (V804)
Category Path: CYLINDERS TANKS > Valves / Manifolds

OMS H-Valve Adapter Right (V804)

The OMS H-Valve Adapter Right (V804) is used to convert OMS, Dive Rite or compatible brand Modular Valves into an H-Valve system. A H-valve is a...
$149.00

Max: 2
San-o-Sub Dual Outlet Isolation Manifold (232 Bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Dual Outlet Isolation Manifold (232 Bar)

The San-o-Sub Dual Outlet 232 Bar Isolation Manifold is designed and manufactured in Italy for long life and heavy use. The manifold consists of left...
$388.00
San-o-Sub Dual Outlet Isolation Manifold (300 Bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Dual Outlet Isolation Manifold (300 Bar)

The San-o-Sub Dual Outlet 300 Bar Isolation Manifold is designed and manufactured in Italy for long life and heavy use. The manifold consists of left...
$388.00
Sonar Dual Outlet Isolation Captured O-Ring Manifold (300 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Dual Outlet Isolation Captured O-Ring Manifold (300 bar)

The Sonar Dual Outlet 300 Bar Isolation Captured O-Ring Manifold is designed and manufactured for long life and heavy use. It has a 215 mm (8.5 inch)...
$319.00

Max: 1
San-o-Sub Modular DIN/K Manifold Valve - LEFT (232 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Modular DIN/K Manifold Valve - LEFT (232 bar)

This Left Hand Side 232 Bar DIN/K Modular Manifold Valve , without blanking plug, is made by San-o-Sub , a leading Italian manufacturer of medical,...
$125.00
San-o-Sub Modular DIN/K Manifold Valve - RIGHT (232 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Modular DIN/K Manifold Valve - RIGHT (232 bar)

This Right Hand Side 232 Bar DIN/K Modular Manifold Valve , without blanking plug, is made by San-o-Sub , a leading Italian manufacturer of medical,...
$125.00
San-o-Sub Modular HP DIN Manifold Valve - LEFT (300 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Modular HP DIN Manifold Valve - LEFT (300 bar)

This Left Hand Side High Pressure DIN Modular Manifold Valve , without blanking plug, is made by San-o-Sub , a leading Italian manufacturer of...
$125.00
San-o-Sub Modular HP DIN Manifold Valve - RIGHT (300 bar)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Modular HP DIN Manifold Valve - RIGHT (300 bar)

This Right Hand Side High Pressure DIN Modular Manifold Valve , without blanking plug, is made by San-o-Sub , a leading Italian manufacturer of...
$125.00
San-o-Sub Manifold Isolation Cross Bar (150mm)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Manifold Isolation Cross Bar (150mm)

The San-o-Sub Manifold Centre Isolation Cross Bar is designed and manufactured in Italy for long life and heavy use. It's available with your...
$165.00
San-o-Sub Manifold Isolation Cross Bar (192mm)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Manifold Isolation Cross Bar (192mm)

The San-o-Sub Manifold Centre Isolation Cross Bar is designed and manufactured in Italy for long life and heavy use. It's available with your...
$165.00
San-o-Sub Manifold Isolation Cross Bar (212mm)
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Manifold Isolation Cross Bar (212mm)

The San-o-Sub Manifold Centre Isolation Cross Bar is designed and manufactured in Italy for long life and heavy use. It's available with your...
$165.00
Sonar Valve End Plug for Rotating Crossbar Manifold Valve
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Valve End Plug for Rotating Crossbar Manifold Valve

These Sonar Valve End Plugs for Rotating Crossbar Manifolds convert the modular valves used with Sonar 200 Bar and San-o-Sub 300 Bar Rotating Cross...
$24.00
San-o-Sub Valve End Plug for Rotating Crossbar Manifold Valve
Category Path: CYLINDERS TANKS > Valves / Manifolds

San-o-Sub Valve End Plug for Rotating Crossbar Manifold Valve

These San-o-Sub Valve End Plugs for Rotating Crossbar Manifolds convert the modular valves used with San-o-Sub 200 Bar and San-o-Sub 300 Bar Rotating...
$19.00
OMS Valve End Cap (to convert manifold valves to singles)
Category Path: CYLINDERS TANKS > Valves / Manifolds

OMS Valve End Cap (to convert manifold valves to singles)

The OMS Valve End Cap is used to convert specific model left and right side manifold valves for use with single cylinders. Convert the OMS V103 and...
$24.00
Sonar DIN Valve Insert for DIN/Yoke Valve
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar DIN Valve Insert for DIN/Yoke Valve

The Sonar DIN Valve Insert for most DIN/Yoke Valve scuba cylinder valves and manifolds. Allows divers to change DIN fitted tank valves to fit...
$24.00
Dive Perfect DIN to Yoke 1st Stage Regulator Adaptor
Category Path: SCUBA and WATERSPORTS > Scuba Diving RECREATIONAL > REGULATORS > Regulator Accessories / Parts

Dive Perfect DIN to Yoke 1st Stage Regulator Adaptor

The Dive Perfect DIN to Yoke First Stage Regulator Adaptor enables a 200 Bar or 300 Bar DIN first stage regulator to be connected to a cylinder with...
$99.00
Male DIN Valve Cover Plug - Machined Delrin
Category Path: CYLINDERS TANKS > Valves / Manifolds

Male DIN Valve Cover Plug - Machined Delrin

The Male threaded DIN Valve Cover Plug for DIN cylinder valves works with either 200-bar or 300-bar DIN valves to protect your scuba diving...
$19.00
Reefline Nitrox DIN/Yoke Valve Protective Cover
Category Path: CYLINDERS TANKS > Cylinder Accessories / Parts

Reefline Nitrox DIN/Yoke Valve Protective Cover

The Reefline DIN/Yoke Valve Protective Cover keeps your cylinder valve protected from the elements when it is not connected to a regulator. This is...
$5.00
Sonar Cylinder Valve Hand-Wheel Rubber Knob - Black Long
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Cylinder Valve Hand-Wheel Rubber Knob - Black Long

The Long, Black coloured Sonar Cylinder Valve Hand-Wheel Rubber Knobs have a tough, high quality rubber grip that gives a tactile feel for ease of...
$12.00
Sonar Cylinder Valve Hand-Wheel Rubber Knob - Black Short
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Rebreather Accessories > Rebreather Cylinders and Valves

Sonar Cylinder Valve Hand-Wheel Rubber Knob - Black Short

The Short, Black coloured Sonar Cylinder Valve Hand-Wheel Rubber Knobs have a tough, high quality rubber grip that gives a tactile feel for ease of...
$9.00
Sonar Cylinder Valve Hand-Wheel Rubber Knob - Blue Long
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Rebreather Accessories > Rebreather Cylinders and Valves

Sonar Cylinder Valve Hand-Wheel Rubber Knob - Blue Long

The Long, Blue coloured Sonar Cylinder Valve Hand-Wheel Rubber Knobs have a tough, high quality rubber grip that gives a tactile feel for ease of...
$12.00
Sonar Cylinder Valve Hand-Wheel Rubber Knob - Green Long
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Cylinder Valve Hand-Wheel Rubber Knob - Green Long

The Long, Green coloured Sonar Cylinder Valve Hand-Wheel Rubber Knobs have a tough, high quality rubber grip that gives a tactile feel for ease of...
$12.00
Sonar Cylinder Valve Hand-Wheel Rubber Knob - Green Short
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Rebreather Accessories > Rebreather Cylinders and Valves

Sonar Cylinder Valve Hand-Wheel Rubber Knob - Green Short

The Short, Green coloured Sonar Cylinder Valve Hand-Wheel Rubber Knobs have a tough, high quality rubber grip that gives a tactile feel for ease of...
$10.00
Sonar Cylinder Valve Hand-Wheel Rubber Knob - Red Long
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Rebreather Accessories > Rebreather Cylinders and Valves

Sonar Cylinder Valve Hand-Wheel Rubber Knob - Red Long

The Long, Red coloured Sonar Cylinder Valve Hand-Wheel Rubber Knobs have a tough, high quality rubber grip that gives a tactile feel for ease of...
$12.00
Sonar DIN/Yoke Cylinder Valve Protector Cover - Vinyl
Category Path: CYLINDERS TANKS > Cylinder Accessories / Parts

Sonar DIN/Yoke Cylinder Valve Protector Cover - Vinyl

The Sonar DIN/Yoke Cylinder Valve Protector Cover is great for keeping your cylinder protected from the elements when it is not connected to a...
$5.00
Sonar HP Sealing 300 Bar DIN Plug with Pressure Relief Button
Category Path: CYLINDERS TANKS > Cylinder Accessories / Parts

Sonar HP Sealing 300 Bar DIN Plug with Pressure Relief Button

The Sonar HP Sealing 300 Bar DIN Plug provides a true high pressure O-ring seal in both 200 bar and 300 bar valves. It's primary purpose is to...
$60.00
Sonar Male Sealing DIN Valve Cover Plug
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Male Sealing DIN Valve Cover Plug

The Sonar Male Sealing DIN Valve Cover Plug provides a true high pressure O-ring seal in both 200 Bar and 300 Bar valves. It's primary purpose is...
$29.00
Sonar Valve Hand-wheel/Knob Spring
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Valve Hand-wheel/Knob Spring

The Sonar Valve Knob Spring is used to tension the scuba cylinder valve hand-wheel knob on the the valve stem. Durable marine grade chromed brass...
$4.00
Sonar Valve Hand-wheel/Knob Spring Retaining Nut
Category Path: CYLINDERS TANKS > Valves / Manifolds

Sonar Valve Hand-wheel/Knob Spring Retaining Nut

The Sonar Valve Hand-wheel/Knob Spring Retaining Nut is used to keep the scuba cylinder valve hand-wheel knob attached to the valve stem. In doing so...
$10.00
APD 200 Bar DIN connector / Oxygen Decanting Hose Converter
Category Path: SCUBA and WATERSPORTS > Scuba Diving TECHNICAL > Oxygen Equipment > Oxygen Adaptors

APD 200 Bar DIN connector / Oxygen Decanting Hose Converter

AP56D200 - 200 BAR DIN Insert / Oxygen Decanting Hose Converter The AP Diving AP56D200 DIN Insert is a replacement part for AP DIN Mini-Cylinder...
$17.00

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