Why is it called a joker valve?

[slingsby]

Replacing it is the most unfunny thing to do so what bright spark at Jabsco named it a joker valve I wonder..

 

[pvb]

I think it was called a "joker" valve because the tricuspid design is similar to the 3-pointed hats worn by jesters.

 

[vyv_cox]

Jabsco were intending to call it a 'choker valve' but found the name was registered in hydraulics technology. So they called it a Joker valve.

 

[andygc]

Jabsco were intending to call it a 'choker valve' but found the name was registered in hydraulics technology. So they called it a Joker valve.

But surely Jabsco merely bought other companies' toilet designs by buying the companies. Raritan and Simpson Lawrence toilets also have joker valves, so how can Jabsco be credited with coming up with the name?

 

[jwilson]

I think the original name came from joke shop raspberry blowing valves: not all joker valves are three-sided, many are single slit just like a whoopee cushion noise-maker.

 

[Lakesailor]

It seems they are then called duckbill valves.

 

[pvb]

It seems they are then called duckbill valves.

True.

 

[VicMallows]

I always find it worrying that they look remarkably similar to (pictures I've seen of) human heart valves

 

[Gwylan]

Replacing it is the most unfunny thing to do so what bright spark at Jabsco named it a joker valve I wonder..

Because it is always taking the pi$$?

 

[pvb]

I always find it worrying that they look remarkably similar to (pictures I've seen of) human heart valves

Yes, but the heart valve was invented first.

 

[PuffTheMagicDragon]

Because it is always taking the pi$$?

... AND a lot of cr*p!

 

[Slowtack]

Must dig out the spare one to show any new crew what they have to deal with if they fail to pump diligently...............