Stainless Steel Bell Jars
MDC stainless steel bell jars are designed for use with MDC
baseplates, base wells and feedthrough collars. A dovetail groove in the
jar’s base flange holds a Viton® elastomer gasket, which makes the vacuum seal with
one of the forementioned components. All stainless steel bell jars are fitted
with a four inch view diameter Pyrex® viewport. All vacuum welds are internal and provide UHV
compatibility. For added convenience, all bell jars are fitted with a hoist or lift-ring that is
welded to the chamber’s domed top. These chambers can be purchased with an optional
MDC feedthrough collars are used to expand the capabilities of conventional bell jars by
providing radially oriented access ports. Four, eight, or eighteen ports fitted with either
2-3/4 inch Del-Seal™ CF metal seal flanges or ISO KF NW40 Kwik-Flange™ flanges are
available. These ports accept a variety of standard MDC vacuum components such as
electrical, fluid and motion feedthroughs. Installation of a feedthrough collar also
requires the use of an MDC baseplate. The feedthrough collar is positioned between a
bell jar and the baseplate. The feedthrough collar / baseplate seal is made with
either an L-gasket or circular cross section elastomer, depending on which collar model is used.
The feedthrough collar seal is made with an L-gasket elastomer. Stainless steel
bell jars would use a circular cross section elastomer in the jar’s dovetail groove to make this seal.
MDC base plates are required for installation of both bell jars and feedthrough collars.
They provide a flat and stable platform upon which bell jar systems can be built.
Baseplates are typically mounted atop a vacuum pump or the gate valve fitted
to the pump. MDC offers three baseplate interface flanges for mating with standard pumps or
gate valves. Interface flanges include ANSI ASA elastomer seal flanges, Del-Seal™ CF
metal seal flanges and bolt style Large-Flange™ ISO LF elastomer seal
flanges. Baseplates are available with baseplate flange diameters suitable for 12,
18 and 24 inch chamber body diameters.
Base wells are the product of integrating both a baseplate and a feedthrough collar.
They provide the functionality of both components and replace one vacuum seal
with a weld joint. They are available with radially oriented access ports in four,
eight, or eighteen port configurations and are fitted with either 2-3/4 inch Del-Seal™ CF metal
seal flanges or ISO KF NW40 Kwik-Flange™ flanges. These ports accept a variety
of standard MDC vacuum components such as electrical, fluid and motion feedthroughs.
Both baseplates and base wells connect to the vacuum pumping system with a choice
of standard smooth face ASA ANSI flanges, optional Del-Seal™ CF metal seal flanges or
ISO LF bolt-style Large-Flange™ flanges. Gasket seals for any flange or port are not
included with baseplates or base wells and must be purchased separately. For pump
port or access port flange hardware, refer to individual flange specifications in the
Flanges & Fittings section of this catalog.
Typical stainless steel bell jar system