ISO 6182-3:2012 防火—自動スプリンクラーシステム—パート3：ドライパイプバルブの要件と試験方法 | ページ 2

3.1

alarm device

mechanical or electrical device to sound an alarm upon operation of the valve

3.2

automatic drain

normally open device that automatically drains water from and vents the intermediate chamber of a valve to the atmosphere when the valve is in the ready position, and limits water flow from the chamber after the valve has tripped

3.3

clapper

type of sealing element

3.4

corrosion-resistant material

metallic material of bronze, brass, Monel ¹⁾ metal, austenitic stainless steel, or equivalent, or plastic material conforming with the requirements of this part of ISO 6182

3.5

differential

ratio of service pressure to system air pressure (expressed as gauge pressures) at the trip point

3.6

differential-type valve

type of valve in which air pressure in the system acts directly and/or indirectly on the sealing assembly to maintain it in the closed position

Note 1 to entry: The air seat of the sealing assembly is of equal or larger diameter than the diameter of the water seat of the sealing assembly, with the two separated by an intermediate chamber maintained at atmospheric pressure.

3.7

dry pipe system

automatic fire protection system in which the piping contains air or nitrogen under pressure, the release of which allows water from a water supply to discharge through the system

3.8

dry pipe valve

valve that controls the flow of water into a dry pipe sprinkler system and incorporates provision for actuation of an alarm under specified conditions

3.9

flow velocity

speed of water flow through a valve expressed as the equivalent water velocity through a pipe of the same nominal size as the valve

3.10

intermediate chamber

that part of a valve which separates the air and/or water sealing assembly seating surfaces and is at atmospheric pressure when the valve is in the ready condition

3.11

leak point

system air pressure for a specific service pressure at which water begins to flow from the intermediate chamber, automatic drain valve or alarm connection

3.12

mechanical-type valve

type of valve in which the air pressure in the system acts on the sealing assembly and linking mechanism to maintain it in the closed position

3.13

minimum opening pressure

minimum pressure when water begins to pass through the valve

3.14

priming water

water used to seal a sealing assembly and prevent cementation of working parts

3.15

rated working pressure

maximum service pressure at which a valve is intended to operate

3.16

ready (set) condition

state of a valve with the sealing assembly in the closed or set position with service and system pressure applied

3.17

reinforced elastomeric element

element of clapper, clapper assembly or seat seals in a composite of an elastomeric compound with one or more other components

3.18

sealing assembly

main movable sealing element (such as a clapper or diaphragm) of the valve which prevents the reverse flow of water and which maintains air pressure in the system piping

3.19

sealing assembly seat ring

main fixed sealing element of a valve which prevents the reverse flow of water and which maintains air pressure in the system piping

3.20

service pressure

static water pressure at the inlet to a valve when the valve is in the ready condition

3.21

system air pressure

static air pressure in the system piping when the valve is in the ready condition

3.22

system pressure

static water pressure at the main outlet of a valve when the valve is in the ready condition

3.23

trim

external equipment and pipework, excluding the main installation pipework, fitted to valve installation assembly

3.24

trip point

point at which a valve operates, admitting water into the system, measured in terms of the system air pressure at a given service pressure

3.25

water motor alarm

hydraulically driven device which provides a local audible alarm as a result of a flow through a valve