H-Valve vs Y-Valve

[lowviz]

"The difference between an H valve and a Y valve is that the Y valve body splits into two posts roughly 90° to each other and 45° from the vertical axis, looking like a Y, while an H valve is usually assembled from a valve designed as part of a manifold system with an additional valve post connected to the manifold socket" Wikipedia, if you trust the reference...

---------- Post added August 28th, 2013 at 05:26 PM ----------

This may help explain the confusion: http://www.scubaboard.com/forums/dir/239164-h-valve-vs-y-valve.html#post3637960

 

[turnerjd]

"The difference between an H valve and a Y valve is that the Y valve body splits into two posts roughly 90° to each other and 45° from the vertical axis, looking like a Y, while an H valve is usually assembled from a valve designed as part of a manifold system with an additional valve post connected to the manifold socket" Wikipedia, if you trust the reference...

---------- Post added August 28th, 2013 at 05:26 PM ----------

This may help explain the confusion: http://www.scubaboard.com/forums/dir/239164-h-valve-vs-y-valve.html#post3637960

That just confirms what I thought. Both sides are independent in both an H and a Y valve. Most Y valves have the added advantage that the two sides are completely independent with different air paths and dip tubes, whilst there is only one dip tube in an H valve that splits into two separate air paths at the level of the manifold/second valve attachment point.

Jon

 

[Max Speed]

Y and H valves are both popular on this side of the pond. Two first stages are used on the backgas on almost all deco dives, and Y valves are 'cheap as chips'. Many different styles and makes are available. One piece Y valves are preferred by many over modular H valves as they have fewer failure points.

Robinets - Robinetterie et accessoires

Jon

All seem to be 25mm threads. Bummer for us 3/4 x14 folks.

Sent from my GT-P3113 using Tapatalk 2

 

[lowviz]

That just confirms what I thought. Both sides are independent in both an H and a Y valve. Most Y valves have the added advantage that the two sides are completely independent with different air paths and dip tubes, whilst there is only one dip tube in an H valve that splits into two separate air paths at the level of the manifold/second valve attachment point.

Jon

I swear I passed on buying an ancient y-valve as it had a single post that controlled both arms. Yes, the newer ones appear to be H-like. Been looking for the old Y, haven't found a pic yet...

 

[turnerjd]

All seem to be 25mm threads. Bummer for us 3/4 x14 folks.

Sent from my GT-P3113 using Tapatalk 2

3/4 x14 is as rare as rocking horse droppings here, although it has existed in the past, and the link i gave does have a single valve with a DIN 3/4 neck thread which I think is the correct name here for 3/4x14. The CE standard and preceding NFC, BS, DIN etc standards have specified M25 for many, many years,

Jon

 

[Glenlivet]

What do you call this valve type? Isn't it also a H-valve, despite not being modular?

 

[turnerjd]

What do you call this valve type?

Strange?

I don't actually know, but I would guess at a Y valve. Just draw lines for the air paths, and it will look pretty Y-ish.

Jon