Why Use A Conical Reducer? Conductance.

conical reducer

A reducer nipple is a vacuum component that allows the connection of two different flange sizes within a high or ultra-high vacuum system. Reducer nipples are offered in two different configurations: conical and straight.


What advantage does a conical reducer offer compared to a similarly flanged straight reducer? The answer is simple: Conductance!

Over the same length, a conical reducer has a larger mean diameter than a straight reducer with the same flange terminations. As illustrated by the equation for conductance (C) below, diameter (D) has a third-order effect on conductance. So, if you want to increase conductance, increasing diameter is the best place to start! Reducing length (L) helps as well, but length only has a first-order effect on conductance.


C = 75D3 / L

CF Conical Reducer

ANCORP offers conical and straight reducer nipples in both ConFlat (CF) and ISO-QF (KF) and LF flange configurations.


Eliminating bends in a vacuum system is another way to optimize conductance. When it comes to designing a system for optimal conductance, it helps to remember these three characteristics: Fat, Short, and Straight!