Valve

(noun.) one of the paired hinged shells of certain molluscs and of brachiopods.

(noun.) the entire one-piece shell of a snail and certain other molluscs.

(noun.) control consisting of a mechanical device for controlling the flow of a fluid.

(noun.) device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone.

(noun.) a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it.

手打:奥利

• The exhaust valve is then closed, the inlet valve opened, and another cycle of four strokes begins. 伯莎M.克拉克. 科学通论.
• From this space it reaches the outer air by a valve at the bottom of the outer vessel. Edward W. Byrn. 十九世纪发明进展.
• That's right, said St. Clare; put on the steam, fasten down the escape-valve, and sit on it, and see where you'll land. 哈丽叶特·比切·斯托. 汤姆叔叔的小屋.
• And yet her large, grave eyes upon him seemed to open some valve in his veins, and involuntarily he was telling. 戴维·赫伯特·劳伦斯. 恋爱中的女人.
• Gauge cocks to indicate the height of water, and a safety valve to regulate the pressure of steam, were employed. 威廉·亨利·杜利特. 世纪发明.
• The liquid ammonia flows through the regulating valve _V_ into the coil _E_, in which the pressure is kept low by the pump _C_. 伯莎M.克拉克. 科学通论.
• From the bottom of the cylinder a tube runs down into the well or reservoir, and water from the well has access to the cylinder through another outward-moving valve. 伯莎M.克拉克. 科学通论.
• Fresh accessions of air are furnished to the apparatus through valve 10 as fast as the air is liquefied. Edward W. Byrn. 十九世纪发明进展.
• When the piston moves downward as in (3), the valve in the pipe closes by its own weight, and the air in the cylinder escapes through the valve in the plunger. 伯莎M.克拉克. 科学通论.
• Dentist's chairs have been developed until it is only necessary for the operator to turn a valve governing a fluid, generally oil, under pressure to raise or lower the chair and the patient. 威廉·亨利·杜利特. 世纪发明.
• Then came improved weighted and other safety valves to regulate and control this pressure. 威廉·亨利·杜利特. 世纪发明.
• The surplus water is best removed by centrifugal pumps, since sand and sticks which would clog the valves of an ordinary pump are passed along without difficulty by the rotating wheel. 伯莎M.克拉克. 科学通论.
• Here, as in other pumps of its type, the valves open inward rather than outward. 伯莎M.克拉克. 科学通论.
• Among these, are siphon pumps, the force pump of Ctesibius, a fire-pump, having two cylinders, and two pistons, valves, and levers. 威廉·亨利·杜利特. 世纪发明.
• The absence of all valves renders it very suitable for draining marshes, and for other similar purposes, as the muddy water and suspended matters will not obstruct its action. 弗雷德里克·科利尔·贝克维尔. 伟大的事实.
• When the bricks in E′ C′ become cooled by the passage of gas and air, the valves are again adjusted to reverse the currents of gas and air, sending them now through chambers C and E again. Edward W. Byrn. 十九世纪发明进展.
• The heels of the workman, alternately raised, form alternately acting valves, and the skin cover, when depressed, acts as a bellows. Edward W. Byrn. 十九世纪发明进展.
• All of these instruments, however, except the trombone possess some valves which, on being pressed, vary the length of the tube and alter the pitch accordingly. 伯莎M.克拉克. 科学通论.
• However, it was the double-acting pump having two chambers and two valves, and in which the piston acted to throw the water out at each stroke. 威廉·亨利·杜利特. 世纪发明.
• In the trombone, valves are replaced by a section which slides in and out and shortens or lengthens the tube. 伯莎M.克拉克. 科学通论.

录入:史黛西