Why is there only one gasket between the two flanges?
The interface can bite more closely, not a phenomenon
A shim is placed between the two flanges to increase the seal.
You haven't studied physics? Two words, the middle can be said that the friction is zero, this to force analysis, used differential, that is, for you to say so, put too much, it is not clamped tight, no matter how much power is not tightly clamped.
Plus two, there's a gap. The phenomenon of leakage is easy to produce. Flange is a sealed pipe fittings. Having rubber, asbestos, or metal.
