Fury Valve Sire of Shards

Do these two work together? Looking at a magma orb build.

The extra projectiles will of course work.
The "fire projectiles in a Nova" will "work", but since your nova will be composed by a single projectile, it will be like casting a single projectile.

The actual question is if a skill that use chains in a particular way like Magma Orb or Molten Strike will work with Fury Valve. Wikia only gives those hints with certain skills:

Scratch that, of course you will find GGG answers on Reddit about your doubts, if you delve enough:

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Mark_GGG wrote:

Splitting is an on-collision effect, just like fork, chain, pierce and most forms of returning. Projectiles that don't collide with enemies can't split.

So, no dice for your build. You will have to use a build with projectiles that actually collide.

Thanks!