| AVS 60th International Symposium and Exhibition | |
| Vacuum Technology | Tuesday Sessions |
| Session VT-TuM |
| Session: | History of Vacuum Technology |
| Presenter: | J.F. Hartnett, Vacuum Research Corporation |
| Correspondent: | Click to Email |
In the early 1950’s the vacuum industry was just beginning and there were few commercially available components, such as gate valves, for those working in the field. In 1953 three people in northern California formed Vacuum Research Corporation and began a collaboration to develop low cost gate valves for use in high vacuum.
Andrew Guthrie (1915 – 1977) worked at what was then known as the ‘Rad Lab’ and in 1963 published Vacuum Technology (ISBN 63-20631).
Ernest Martinelli (1919 – 2010) also worked at ‘Rad Lab’. He spent many years as deputy chief of the physics department at RAND Corporation.
Hugh Perazone (1900 – 1974) owned and operated a permanent mold aluminum foundry.
Between 1954 and 1963 VRC was issued four patents. Although these patents are long expired the VRC claims are still used today by almost every manufacturer of vacuum gate valves.
Rotary actuator shaft seals as still used today in the VAT Series 14, GNB C-Style, and VRC LPWA Bonnet and OP One Piece styles.
High conductance oversize bores using flanges with the standard ANSI (ASA) bolt circle and outside diameter but with larger inside diameters for higher conductance still used today by almost all vacuum valve makers including VAT, GNB, VRC, HVA, etc.
Remote actuation automatic electro-pneumatic actuators that allowed easy operation of gate valves, even when located in difficult to reach or hazardous locations.
Bonnet style body construction that allows all moving parts to be removed for cleaning or replacement in less than five minutes and without disruption to the pump stack or piping.
Throttle valves with powerful servo motors that also provide leak tight shut off and an unobstructed high conductance port eliminating the need for separate throttle and pump isolation valves.
Protective ring gate valves for dirty applications such as investment casting furnaces.
Water cooled gate valves with both water cooled gates and port flanges.
Rectangular port valves with ports up to 3 meters wide.
Fast closing valves that can close in milliseconds.
Many manufacturers have continued to work on gate valve developments and some of the more interesting developments are: