valve
noun
vælv
noun
1
a
part
of
a
tube
or
pipe
that
opens
and
shuts
like
a
door
to
control
the
flow
of
liquid,
gas,
air
etc
passing
through
it
阀，活门; 瓣（膜）
heart
valves
心脏瓣膜
2
the
part
on
a
TRUMPET
or
similar
musical
instrument
that
you
press
to
change
the
sound
of
the
note
〔小号等乐器上的〕阀键，活塞
3
a
closed
glass
tube
used
to
control
the
flow
of
electricity
in
old
radios,
televisions
etc
[英] 电子管，真空管;
BrE AmE