Valve types

[Physicoder]

I watched your video on Youtube about different types of valves.

Even though, I found your article on the same topic at the website, I did not find the answer to my question.
Bicycle tubes – valve types and tube sizes explained

You mentioned that the Dunlop valve is obsolete and you would tell about the disadvantages.
Neither in the video nor in the text I see it.

So, to make this topic complete, what could we say about the advantages and disadvantages of those valves?

In my adult life, I do use almost solely Dunlop valves. The way I see the situation about them is:

• easy to exchange, no special tool is needed (+)
• target for vandalism, I had this experience a couple of times. You can easily steal the valve, or deflate the tire instantly. (-)
• sometime it is very hard to pump the air. Not sure if it has something to do with the aging, but I needed to apply the pressure >4 bar to pump a fully deflated tire. (-)
• I cannot say that the valve is obsolete. Maybe, the design is not new/modern, but I see the presence of Dunlop and Schrader valves in the shop equally with even slight dominance toward Dunlop. (+)

What is your opinion?

 

[BikeGremlin]

I watched your video on Youtube about different types of valves.

Even though, I found your article on the same topic at the website, I did not find the answer to my question.
Bicycle tubes – valve types and tube sizes explained

You mentioned that the Dunlop valve is obsolete and you would tell about the disadvantages.
Neither in the video nor in the text I see it.

So, to make this topic complete, what could we say about the advantages and disadvantages of those valves?

In my adult life, I do use almost solely Dunlop valves. The way I see the situation about them is:

• easy to exchange, no special tool is needed (+)
• target for vandalism, I had this experience a couple of times. You can easily steal the valve, or deflate the tire instantly. (-)
• sometime it is very hard to pump the air. Not sure if it has something to do with the aging, but I needed to apply the pressure >4 bar to pump a fully deflated tire. (-)
• I cannot say that the valve is obsolete. Maybe, the design is not new/modern, but I see the presence of Dunlop and Schrader valves in the shop equally with even slight dominance toward Dunlop. (+)

What is your opinion?

That is a very good question that I did neglect to answer in both the video and the article. I've corrected that error by adding another section to the article:

3.5. Valve types pros and cons

Briefly, the pros and cons of each valve type:

• Dunlop valves
  Impractical for quick locking of the pump head – you must either screw on an adapter, or use one hand to hold the hose on the valve. They don’t provide an accurate feedback of the tyre pressure while pumping. I would say they are more prone to air leaking, while not allowing convenient controlled release of air. Unlike Presta valves that can be released by hand, when these stick, you need extra pressure in order to “unstick” the valve seal when inflating.
• Schrader (auto) valves
  A bit wider and heavier compared to Presta valves. The increased width makes them stronger, while modern bikes don’t use rims (and tyres) so narrow to require the thinner Presta valves. The main disadvantage is that you need to overcome the valve’s spring when inflating.
• Presta valves
  These valves are the thinnest. If you are using very narrow rims for very narrow tyres, you don’t have much choice. However, today the super-narrow tyres and rims are obsolete even on road bikes. An additional advantage is that you can (and should) use your hand to get them unstuck before pumping, and there is no spring load to overcome when inflating. The main downsides are the more complicated operation (for an average cyclist, this is the most confusing patent), and the fact they easily break (especially if you are using a small frame pump without a flexible hose).

Relja

P.S.
The trend of stealing valve caps (and valve heads of Dunlop valves) has drastically declined (to a practical stop) compared to when I was a small child, at least in my country.
In terms of popularity, I would argue it is being replaced by Schrader and Presta, but is definitely not completely gone from use.