Abstract: Close tolerance, oil free scroll type vacuum pumps, when run at RPM speeds in excess of 1800 RPM, prevent pump exhaust outlet to pump vacuum inlet back diffusion (backwards migration) of light atmospheric gases from a process vacuum is useful in a number of vacuum applications. The light gas isolation capability of the invention scroll type vacuum pumps is due to the close tolerance pumping mechanism that these pumps employ, the RPM speed that the mechanism is operated at, and the absence of light gas absorbing materials inside the pump such as oil.

Abstract: A method for making vacuum components from plastic material, and in particular, PVC and CPVC, where the plastic component is exposed to a high vacuum or ultra high vacuum for an extended period of time, by which the outgas rate drops considerably to levels that are well within required limits for high vacuum and ultra high vacuum applications. Residual gas analysis may be used to certify this low outgas level for the plastic components.

Abstract: The invention relates specifically to a simplified and subsequently improved method to produce a scroll type vacuum pump that is capable of achieving vacuum pressures below 1 torr through the placement of at least one dynamic orbital vacuum seal between the two scroll halves at the outside diameter of the scroll spirals to prevent atmospheric gas from entering. Prior to this invention, in order to achieve vacuum pressures less than 1 torr with a scroll pump it has been necessary to either seal the two scroll halves with a large diameter metal bellows that accommodates the required orbital travel or to locate the orbiting scroll plate or plates and the components that convert the rotary drive to the required orbital motion inside the vacuum space with a dynamic vacuum seal on the rotary drive shaft. Both of these designs have been expensive to produce, limiting the application of scroll technology in the vacuum industry to special applications.

Abstract: The invention relates specifically to an improved method of joining plastic socket fit piping components for vacuum, pressure, and structural applications where a leak and contamination free connection is needed. A unique Dual Face/Circumferential Elastomer Seal is installed in a special Seal Groove located on the end of the male component. The male components are then inserted into the female sockets until contact is made between the Dual Face/Circumferential Elastomer Seals and the Female Socket Base Surfaces. The final assembly is evacuated with a vacuum pump to actuate and fully compress the seals. The final assembly is then checked for leaks. If the connections are to remain under vacuum and the ability to disassemble is advantageous, no further work is required.