Thread type: W Tapered - gas cylinder valve thread DIN 477
The table for the gas cylinder valve thread W tapered contains all tapered threads permitted by DIN 477 that may be used on gas cylinder valves. In addition to tapered threads, there are also cylindrical gas cylinder valve threads. Gas cylinders and all their components and markings are subject to particularly strict regulations. This is because gases can pose a considerable safety risk depending on their condition and composition. The table for the gas cylinder valve thread W tapered helps to prevent dangerous combinations from occurring.
The gas cylinder valve threads W tapered from the table are designed in such a way that mix-ups of gas types can be ruled out. To ensure that the threads listed in the table Gas cylinder valve threads W tapered can also fulfill this function, the use of adapters is prohibited in Germany. If the gas cylinder connection does not fit as expected, there is ultimately a good reason for this and the connection should never be made by force or with aids.
The W tapered thread table for gas cylinder valve threads is naturally structured somewhat differently than you are used to from other thread tables. The left-hand column shows the numbering of the connections in accordance with DIN 477. The middle column of the W tapered thread table for gas cylinder valve threads explains the gas types for which the respective connection is approved. In some cases, you will find connections in the W tapered thread table that are only assigned to a single type of gas. Other connections are suitable for entire groups of gases. The right-hand column of the W tapered thread table then contains the actual description of the respective thread. In addition to the thread type W, the metric standard thread M and the pipe thread G also appear in the W tapered thread table for gas cylinder valve threads. In the right-hand column you will also find information on whether the thread is internal or external and whether it is a right-hand or left-hand thread. According to the W tapered thread table, gas cylinder valve threads for gases that are frequently used in the domestic environment - such as propane - often have left-hand threads. This serves to protect laypersons who would otherwise be particularly exposed to the risk of causing fires or explosions through incorrect connections with unsuitable components.
| Connection No. | Approved Gas Types | Thread |
|---|---|---|
| 1 | Arsine, 1,3-butadiene, butane, 1-butene, chloroethene, chloromethane, deuterium, difluoromethane (R32), dimethyl ether, 2,2-dimethylpropane, ethane, ethene, ethylene, isobutane, isobutylene, methane, hydrogen phosphide (Phoshin) propane, propene, silicon hydride (silane), hydrogen | W 21,80 x 1/14" left |
| 2 | Butane, isobutane, propane (up to 33 liter volume) | W 21,80 x 1/14" left |
| 3 | Acetylene | Clamping bracket |
| 5 | Dichlorosilane, carbon monoxide, hydrogen sulfide | W 1" left |
| 6 | Ammonia, argon, chlorodifluoromethane (R22) helium, carbon dioxide, krypton, neon, octafluorocyclobutane (R C318), octafluoropropane (R 218), sulfur hexafluoride, carbon tetrafluoride (R14) Tifluormethan (R23) Xenon | W 21,80 x 1/14" right |
| 7 | Ssulfur dioxide | G 5/8" |
| 8 | Boron trichloride, boron trifluoride, hydrogen bromide, chlorine, hydrogen chloride, hydrogen fluoride, nitrogen dioxide, nitric oxide, nitrogen trifluoride | W 1" right |
| 9 | Oxygen calibration gas (oxygen) 21%) | G 3/4" right |
| 10 | Nitrogen | W 24,32 x 1/14 right |
| 11 | Nitrous oxide (normal connection) | G 3/8" right |
| 12 | Nitrous oxide (up to 3 liters of volume) | G 3/4" right, internal |
| 14 | Test gas (oxygen <21%) | M 19 x 1,5 left |
| 52 | Non-flammable and non-toxic gases filling pressure 300 bar | M 30 x 1,5 right, internal |
| 54 | non-flammable, non-toxic and non-oxidizing gases and gas mixtures | W 30 x 2 (15,9 / 20,1) right |
| 55 | Non-flammable, toxic and corrosive gases and gas mixtures | W 30 x 2 (15,2 / 20,8) right |
| 56 | Compressed air | W 30 x 2 (16,6 / 19,4) right |
| 57 | Flammable, non-toxic gases and gas mixtures | W 30 x 2 (15,2 / 20,8) left |
| 58 | Flammable, toxic and corrosive or non-corrosive gases and gas mixtures | W 30 x 2 (15,9 / 20,1) left |
| 59 | Oxygen and oxidizing, non-toxic, non-corrosive gases and gas mixtures | W 30 x 2 (17,3 / 18,7) right |
| 60 | Oxidizing, toxic and / or corrosive gases and gas mixtures | W 30 x 2 (18 / 18) right |
| 0170 | Argon, helium, nitrogen, charge pressure> 200 to 300 bar | W 30 x 2 right |
| Gas cylinder valve protection cap | W 80 x 1/11" right | |
