Stainless Steel ball valves are cost effective straight through high conductance valves. Their simple, robust design provides high reliability in low vacuum applications. Ball vales are commonly used on CVD equipment downstream from the chamber or vacuum pump to isolate traps or abatement tools. A quarter-turn of the handle quickly switches the valve from open to close. ball valves offers straight- through, unimpeded flow with minimal space requirements, and they would be applied for high pressure, high temperature environment.