|Shaft seals are integral to all HyVac vacuum pumps. They separate
the outside of the pump to the oil sump inside the pump and allow for drive shaft exit of
the pump itself in a leak free manner. Because of HyVacs' migration over the last 3 years
to lip seals from mechanical seals, the user has a wider variety of options available in
order to attack problem applications based on chemical and shaft seal incompatibilities.
These options have been organized on an increasing cost basis. In other words, the prices
increase as option numbers increase. Even option 3, perfluoro elastomers, is not an
outrageous solution if you are experiencing premature shaft seal failure on a regular
Standard - Buna-N - The standard factory issue seal material for
HyVac pumps is a good, oil and water-resistant seal.
Option 1 - EPDM - A seal of choice where fluoro elastomers fail and a solvent
mix is the problem. This is a good choice before all out war using perflouro elastomers.
Option 2 - Fluoro Elastomers - One of the original, chemically resistant,
elastomers that can be counted on for good to excellent performance in most solvent, acid
and basic contaminated systems.
Option 3 - Perfluoro Elastomers - Space age elastomer that is chemically inert (
means impervious to most chemical attack) and is useful as a sealant in all systems except
those involved with Fluorocarbon based solvents.
Call HyVac customer service if you need help in selecting a shaft seal material
and to determine availability. Generally buna-N and perfluoro elastomers are easy to get
or in stock, the others wait a bit.
Chemical compatibility chart coming soon. This will enable you to determine a
plan of attack based on your specific problem area.