Herbie Question?

[Kabong]

Is it the gate valve on this setup that makes all the difference?
Looking at the design of the top of it in theory couldn't you cut the top off your durso and accomplish the same thing for the top?

I have a durso that comes out the back.



Would cutting off the top to let air have unrestricted flow, along with replacing my ball valve with a gate valve give me the Herbie effect?