cone / conical springs?

[mueller]

<standard disclaimer, I'm still a cocker rookie>

I don't recall coming across conical springs before, but just found two in a row in what looks to be otherwise-mundane 2000-2004 cocker's valve sets.

Are / were these common? Is there a specific outcome/application for them? Not getting anywhere on the googles

[Grendel]

Not super common there was one of the suppliers over the years that used them but I do not remember who. For our purposes not necessary but will no hurt operation given the spring rate is correct. I have used random compression springs in my setups from all sorts of sources I just pick one that has the rates, diameter and length I'm looking for. The one on the Right side has been clipped by someone which I will do but they should have dead ended the spring after clipping for less wear damage and better spring rate consistency.

The one advantage is you theoretically can use a longer lower rate spring when using a conical spring to get less valve bounce and farting but I never tested out this theory as I rarely care about a little farting I do it often

[RuleOfSines]

Main benefit that I am aware of is they are naturally resistant to bending. If you compress one it should be less likely to develop a sideways bulge than a straight spring will. I've used them in Nightmares for that reason.

[Pyrate Jim]

Kind of thought the wide end fit the valve chamber and the narrow end fit the cup seal.

[Jonnydread]

I seem to recall that's how older Spyder valve springs were designed.

[mueller]

spyders are set up that way (conical on the cupseal) but both the sets I'd pictured had the conical on the hammer side.

[Pyrate Jim]

I'll admit what I pictured came in a lot.
I made the assumption that since the valves were bagged together with a PPS 3-way that they were 'Cocker valves, perhaps PPS as well.
I'd have to take a closer look at the valve stems. If they are cut for blowback, they likely match Kingman.
Speaking of Kingman, I have a Spyder I bought in '97 (98?). Way back when.
The cup-seal spring is not tapered, but centered by a fingered washer. Hard to explain, I'll get pics next time I dig it out.

For the 'Cocker, I would assume (there's that word again) that being a mainspring the wider end is pocketed into the hammer and the smaller end pushes back against the IVG, being centered by the cocking rod.