WELCOME TO
THE SEAL & GASKET CHAPTER
Alberto de Barrena-Sarobe
and
Yasuhisa Komura's
How to prevent leakage of fluids between moving parts where there
is friction, has been a recurring engineering problem since the invention
of the wheel. Seals and gaskets were created as the solution for this
problem. Yet, every day specifications for modern machines demand more
power, greater speed, longer running life, higher pressure, each of which,
in turn, presents a requirement for new materials, improved design, and better
methods of sealing. The prevention of leakage under conditions such as
high pressure or temperature, or both, of a fluid which is corrosive, or
dangerous, or explosive for a continuous operating machine can be, and often
is, an engineering nightmare.
This chapter is an attempt to produce important basic information
of the different types of seals available today. The material contained
in this chapter is directed towards finding the seal that will best be
suited for a specific application, and not in how to design the perfect seal.
A SEAL can basically be defined as a device which closes a gap or prevents
a joint from leaking fluids. The fluid can be either a gas or liquid, and
in some special cases also solids such as dust or dirt. Seals can be used
to stop fluid from escaping or entering an enviroment. There are a large
number of seals, and their sizes and materials used to manufacture them are
as diverse as their number. All of these seals can be separated into two
categories: Dynamic seals, and Static seals.
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