DICT.TW Dictionary Taiwan

 safety valve
 安全閥

 Pup·pet n.  [Written also poppet.]
 1. A small image in the human form; a doll.
 2. A similar figure moved by the hand or by a wire in a mock drama; a marionette; a wooden actor in a play.
 At the pipes of some carved organ move,
 The gilded puppets dance.   --Pope.
 3. One controlled in his action by the will of another; a tool; -- so used in contempt.
 4. Mach. The upright support for the bearing of the spindle in a lathe.
 Puppet master. Same as Puppetman.
 Puppet play, a puppet show.
 Puppet player, one who manages the motions of puppets.
 Puppet show, a mock drama performed by puppets moved by wires.
 Puppet valve, a valve in the form of a circular disk, which covers a hole in its seat, and opens by moving bodily away from the seat while remaining parallel with it, -- used in steam engines, pumps, safety valves, etc.  Its edge is often beveled, and fits in a conical recess in the seat when the valve is closed. See the valves shown in Illusts. of Plunger pump, and Safety valve, under Plunger, and Safety.
 ◄ ►

 Safety chain. (a) Railroads A normally slack chain for preventing excessive movement between a truck and a car body in sluing. (b) An auxiliary watch chain, secured to the clothes, usually out of sight, to prevent stealing of the watch. (c) A chain of sheet metal links with an elongated hole through each broad end, made up by doubling the first link on itself, slipping the next link through and doubling, and so on.
 Safety arch Arch., a discharging arch. See under Discharge, v. t.
 Safety belt, a belt made of some buoyant material, or which is capable of being inflated, so as to enable a person to float in water; a life preserver.
 Safety buoy, a buoy to enable a person to float in water; a safety belt.
 Safety cage Mach., a cage for an elevator or mine lift, having appliances to prevent it from dropping if the lifting rope should break.
 Safety lamp. Mining See under Lamp.
 Safety match, a match which can be ignited only on a surface specially prepared for the purpose.
 Safety pin, a pin made in the form of a clasp, with a guard covering its point so that it will not prick the wearer.
 Safety plug. See Fusible plug, under Fusible.
 Safety switch. See Switch.
 Safety touchdown Football, the act or result of a player's touching to the ground behind his own goal line a ball which received its last impulse from a man on his own side; -- distinguished from touchback. See Touchdown.  Same as safety
 Safety tube Chem., a tube to prevent explosion, or to control delivery of gases by an automatic valvular connection with the outer air; especially, a bent funnel tube with bulbs for adding those reagents which produce unpleasant fumes or violent effervescence.
 Safety valve, a valve which is held shut by a spring or weight and opens automatically to permit the escape of steam, or confined gas, water, etc., from a boiler, or other vessel, when the pressure becomes too great for safety; also, sometimes, a similar valve opening inward to admit air to a vessel in which the pressure is less than that of the atmosphere, to prevent collapse.
 ◄ ►

 safety valve
      n : a valve in a container in which pressure can build up (as a
          steam boiler); it opens automatically when the pressure
          reaches a dangerous level [syn: relief valve, escape
          valve, escape cock, escape]