Our high performance bellows-sealed vacuum valves are designed for high conductance and excellent longevity. The valve bodies and sealing plate are manufactured from 304 stainless steel. The welded bellows is manufactured from AMS350. Actuator housings are machined and honed to micron level precision; designed for 3 million actuation cycles and warranted for 1.5 million cycles or 12 months (whichever occurs first).