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Valve Guid
des
Controls th
he position
Subject to
fluctuations
corrosion,
ingestion o
exhaust va
alve, high te
Must provid
de a predic
between its
self and the
Can be alu
uminum, bra
Valve Seat
ts
Mate with v
valve face t
Metal to m
etal seal
Usually ins
sert but not
Can be res
surfaced
Pistons
Acts as mo
oveable end
and must w
withstand p
stress, and
d mechanic
May use e
lliptical sha
Elliptical w
when cold
Diameter a
at piston pin
edge of pis
ston.
Round whe
en hot
of the valve
es
s in temper
rature, chem
of foreign m
material and
emperature
es.
ctable and c
consistent c
e valve stem
m.
ass or sinte
ered iron.
to seal com
mbustion ch
always
d of the com
mbustion ch
pressure flu
ctuations, t
cal loads
ape
n bore expa
ands more
mical
for the
clearance
hamber.
hamber
thermal
that thin
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