Swapping Valves

[Teller]

Im just wondering if there are different valves for different tanks? For example say I get 2 worthington LP85's and I want to swap the valves, one left hand and one right hand. Will any valve work or is there different sizes or thread patterns?

 

[Scared Silly]

There are two modern straight thread standards 3/4" NPS which is the most common and 7/8" UNF found on true HP cylinders (3500psi). Others include 1/2" tapper and straight, most found on pre 1970 LP steel cylinders.

So swapping is not a big deal. HOWEVER, each valve contains a burst disk that is rated for a particular working pressure. For instance, one should not take a valve from a 3442 psi cylinder and put in on a 2400 psi cylinder unless they change out the burst disk. And visa-versa.

For your example given both are LP cylinders they are probably the same so swap away.

 

[Teller]

So if I find a valve such as the listed below, does that mean I can use it on a HP or LP tank if I get the 2400/4000 PSI burst disk?

Left Side Pro Valve, Piranha Dive Manufacturing

If there is a difference between HP and LP burst disk then how do people with LP tanks get their tanks overfilled?