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valve    音標拼音: [v'ælv]
n. 活瓣,閥,活門
vt.
vi. 裝閥,用閥調節

活瓣,閥,活門裝閥,用閥調節

valve


valve
n 1: a structure in a hollow organ (like the heart) with a flap
to insure one-way flow of fluid through it
2: device in a brass wind instrument for varying the length of
the air column to alter the pitch of a tone
3: control consisting of a mechanical device for controlling the
flow of a fluid
4: the entire one-piece shell of a snail and certain other
molluscs
5: one of the paired hinged shells of certain molluscs and of
brachiopods

Valve \Valve\, n. [L. valva the leaf, fold, or valve of a door:
cf. F. valve.]
[1913 Webster]
1. A door; especially, one of a pair of folding doors, or one
of the leaves of such a door.
[1913 Webster]

Swift through the valves the visionary fair
Repassed. --Pope.
[1913 Webster]

Heavily closed, . . . the valves of the barn doors.
--Longfellow.
[1913 Webster]

2. A lid, plug, or cover, applied to an aperture so that by
its movement, as by swinging, lifting and falling,
sliding, turning, or the like, it will open or close the
aperture to permit or prevent passage, as of a fluid.
[1913 Webster]

Note: A valve may act automatically so as to be opened by the
effort of a fluid to pass in one direction, and closed
by the effort to pass in the other direction, as a
clack valve; or it may be opened or closed by hand or
by mechanism, as a screw valve, or a slide valve.
[1913 Webster]

3. (Anat.) One or more membranous partitions, flaps, or
folds, which permit the passage of the contents of a
vessel or cavity in one direction, but stop or retard the
flow in the opposite direction; as, the ileocolic, mitral,
and semilunar valves.
[1913 Webster]

4. (Bot.)
(a) One of the pieces into which a capsule naturally
separates when it bursts.
(b) One of the two similar portions of the shell of a
diatom.
(c) A small portion of certain anthers, which opens like a
trapdoor to allow the pollen to escape, as in the
barberry.
[1913 Webster]

5. (Zool.) One of the pieces or divisions of bivalve or
multivalve shells.
[1913 Webster]

{Air valve}, {Ball valve}, {Check valve}, etc. See under
{Air}. {Ball}, {Check}, etc.

{Double-beat valve}, a kind of balance valve usually
consisting of a movable, open-ended, turban-shaped shell
provided with two faces of nearly equal diameters, one
above another, which rest upon two corresponding seats
when the valve is closed.

{Equilibrium valve}.
(a) A balance valve. See under {Balance}.
(b) A valve for permitting air, steam, water, etc., to
pass into or out of a chamber so as to establish or
maintain equal pressure within and without.

{Valve chest} (Mach.), a chamber in which a valve works;
especially (Steam Engine), the steam chest; -- called in
England {valve box}, and {valve casing}. See {Steam
chest}, under {Steam}.

{Valve face} (Mach.), that part of the surface of a valve
which comes in contact with the {valve seat}.

{Valve gear}, or {Valve motion} (Steam Engine), the system of
parts by which motion is given to the valve or valves for
the distribution of steam in the cylinder. For an
illustration of one form of valve gear, see {Link motion}.


{Valve seat}. (Mach.)
(a) The fixed surface on which a valve rests or against
which it presses.
(b) A part or piece on which such a surface is formed.

{Valve stem} (Mach.), a rod attached to a valve, for moving
it.

{Valve yoke} (Mach.), a strap embracing a slide valve and
connecting it to the valve stem.
[1913 Webster]



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