pic: It's systems integration time!

[amesmich]

Originally Posted by ToddF

One allows you to forget, and leave it permanently open. The other does not. They are not functionally equivalent.

If one component includes a function which differentiates it from another, and makes it more desirable for a particular application, by definition, they are not equivalent.

1. Any valve can be forgotten about and be left open or closed so I dont see the difference there.

2. No they are not equivalent but they are FUNCTIONALLY equivalent. They serve the same purpose via slightly different methods. More than one compressor is leagal for first. They are both FUNCTIONALLY equivalent but they certainly are not the same one is heavier and can be viewed as a disadvantage.