Found 2 items, similar to Ball valve.
English → English
Definition: ball valve
n : any valve that checks flow by the seating of a ball
English → English
Definition: Ball valve
, n. [L. valva the leaf, fold, or valve of a door:
cf. F. valve.]
1. A door; especially, one of a pair of folding doors, or one
of the leaves of such a door.
Swift through the valves the visionary fair
Heavily closed, . . . the valves of the barn doors.
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.
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.
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.
(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
(c) A small portion of certain anthers, which opens like a
trapdoor to allow the pollen to escape, as in the
5. (Zo["o]l.) One of the pieces or divisions of bivalve or
, Ball valve
, Check valve
, etc. See under
, 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.
(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.
(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
(Mach.), that part of the surface of a valve
which comes in contact with the valve seat
, 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
(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.
(Mach.), a rod attached to a valve, for moving
(Mach.), a strap embracing a slide valve and
connecting it to the valve stem.
(b[add]l), n. [OE. bal, balle; akin to OHG. balla,
palla, G. ball, Icel. b["o]llr, ball; cf. F. balle. Cf. 1st
, n., Pallmall
1. Any round or roundish body or mass; a sphere or globe; as,
a ball of twine; a ball of snow.
2. A spherical body of any substance or size used to play
with, as by throwing, knocking, kicking, etc.
3. A general name for games in which a ball is thrown,
kicked, or knocked. See Baseball
, and Football
4. Any solid spherical, cylindrical, or conical projectile of
lead or iron, to be discharged from a firearm; as, a
cannon ball; a rifle ball; -- often used collectively; as,
powder and ball. Spherical balls for the smaller firearms
are commonly called bullets
5. (Pyrotechnics & Mil.) A flaming, roundish body shot into
the air; a case filled with combustibles intended to burst
and give light or set fire, or to produce smoke or stench;
as, a fire ball; a stink ball.
6. (Print.) A leather-covered cushion, fastened to a handle
called a ballstock; -- formerly used by printers for
inking the form, but now superseded by the roller.
7. A roundish protuberant portion of some part of the body;
as, the ball of the thumb; the ball of the foot.
8. (Far.) A large pill, a form in which medicine is commonly
given to horses; a bolus. --White.
9. The globe or earth. --Pope.
Move round the dark terrestrial ball. --Addison.
10. (Baseball) A pitched ball, not struck at by the batter,
which fails to pass over the home plate at a height not
greater than the batter's shoulder nor less than his knee
(i.e. it is outside the strike zone). If the pitcher
pitches four balls before three strikes are called, the
batter advances to first base, and the action of pitching
four balls is called a walk.
[Webster 1913 Suppl. +PJC]
10. a testicle; usually used in the plural. [vulgar]
11. pl. courage; nerve. [vulgar]
Ball and socket joint
, a joint in which a ball moves within
a socket, so as to admit of motion in every direction
within certain limits.
, a mechanical device for lessening the
friction of axle bearings by means of small loose metal
, a cartridge containing a ball, as
distinguished from a blank cartridge, containing only
, a faucet or valve which is opened or closed by
the fall or rise of a ball floating in water at the end of
, a pivot of a spherical form, which permits
lateral deflection of the arbor or shaft, while retaining
the pivot in its socket. --Knight.
, the lever used in a ball cock.
Ball of the eye
, the eye itself, as distinguished from its
lids and socket; -- formerly, the pupil of the eye.
(Mach.), a contrivance by which a ball, placed
in a circular cup with a hole in its bottom, operates as a
(Mining), a sort of iron ore, found in loose
masses of a globular form, containing sparkling particles.
, or Three golden balls
, a pawnbroker's sign
on the ball
alert; competent and knowledgeable.
to carry the ball
to carry on the task; to assume the
to drop the ball
to fail to perform as expected; to fail to
live up to a responsibility.
Syn: See Globe