automatic valve
31Snifting valve — A snifting valve (sometimes snifter valve) is an automatic anti vacuum valve used in a steam locomotive when coasting. The word Snift imitates the sound made by the valve.When the driver shuts off the steam to the cylinders of a steam locomotive… …
32Expansion valve — Expansion Ex*pan sion, n. [L. expansio: cf. F. expansion.] 1. The act of expanding or spreading out; the condition of being expanded; dilation; enlargement. [1913 Webster] 2. That which is expanded; expanse; extend surface; as, the expansion of a …
33proportioning valve — [1] Any valve which limits pressure in a system, e.g., in a hydraulic circuit, in automatic transmissions, in pneumatic suspension systems, etc. [2] The valve used in the rear brake line of some cars with front disc and rear drum brakes. When… …
34Earthquake Valve — An earthquake valve or seismic valve is an automatic way to shut off the low pressure regulated gas supply to a structure during a major earthquake and/or if a pipe is broken. These are applicable both to utility supplied natural gas and to… …
35Balance valve — Balance Bal ance (b[a^]l ans), n. [OE. balaunce, F. balance, fr. L. bilanx, bilancis, having two scales; bis twice (akin to E. two) + lanx plate, scale.] 1. An apparatus for weighing. [1913 Webster] Note: In its simplest form, a balance consists… …
36expansion valve — A part of an air conditioning system, located between the condenser and the evaporator that regulates the flow of liquid refrigerant to the vaporator. If cooling needs are low, the valve is almost closed; as additional cooling is required, the… …
37Safety valve — Safety chain 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… …
38Stop valve — Stop Stop, n. 1. The act of stopping, or the state of being stopped; hindrance of progress or of action; cessation; repression; interruption; check; obstruction. [1913 Webster] It is doubtful . . . whether it contributed anything to the stop of… …
39throttle valve — [1] A valve in the carburetor. It is used to control the amount of air fuel mixture that reaches the cylinders. Usually consists of a flat round disc mounted on a shaft so that it can be tilted at various angles in the carburetor throttle valve… …
40Triple valve — Triple Tri ple, a. [L. triplus; tri (see {Tri }) + plus, as in duplus double: cf. F. triple. See {Double}, and cf. {Treble}.] 1. Consisting of three united; multiplied by three; threefold; as, a triple knot; a triple tie. [1913 Webster] By thy… …
