ISO 15995:2021 ガスボンベ— LPGボンベバルブの仕様とテスト—手動操作 | ページ 6

3.1

liquefied petroleum gas

LPG

low pressure liquefied gas composed of one or more light hydrocarbons which are assigned to UN 1011, UN 1075, UN 1965, UN 1969 or UN 1978 only and which consists mainly of propane, propene, butane, butane isomers, butene with traces of other hydrocarbon gases

[SOURCE: ISO 10286:2015, 723, modified.]

3.2

cylinder valve

valve

primary shutoff device fitted to LPG cylinders, intended for liquid or vapour filling and withdrawal

Note 1 to entry: The valve includes the valve body (3.8) , valve stem (3.14) , valve outlet (3.15) and valve operating mechanism (3.22) .

Note 2 to entry: The valve can also include additional devices, e.g. eduction tube (3.5) , liquid level indicator (3.7) , fixed liquid level gauge (3.6) , excess flow valve (3.9) , non-return valve (3.10) , sediment tube (3.19) , and pressure relief valve (3.30) .

3.3

external leak tightness

leak tightness to atmosphere (leakage in and/or leakage out), when the valve is open

3.4

internal leak tightness

leak tightness across the valve seat (leakage in and/or leakage out), when the valve is closed

3.5

eduction tube

tube fitted to the valve to allow withdrawal of liquid LPG with the cylinder in its normal operating position

3.6

fixed liquid level gauge

device such as a dip tube in combination with a vent valve to verify that the predetermined maximum liquid level in a cylinder has been reached or surpassed

3.7

liquid level indicator

device such as a float gauge, permitting the gauging of the liquid level in the cylinder

3.8

valve body

major valve component including valve stem (3.14) and valve outlet (3.15) and, where applicable, the provision for other optional components

3.9

excess flow valve

valve comprising two or more components designed to close or partially close when the flow of liquid or vapour passing through it exceeds a predetermined value and to re-open when the pressure differential across the valve has been restored below a certain value

3.10

non-return valve

automatic valve which allows gas/liquid to flow only in one direction

[SOURCE: ISO 10286:2015, 349, amended — liquid added.]

3.11

dual valve

valve designed to allow separate vapour and liquid withdrawal from a cylinder in its normal operating position each port having its own valve operating mechanism

3.12

sealing element

element used to obtain internal leak tightness (3.4)

3.13

special valve

valve which is only used for cylinders up to and including 7,5 l water capacity, having a hand wheel diameter less than 30 mm and where the maximum section of gas passage is not more than 4 mm diameter

3.14

valve stem

section of the valve body (3.8) , which connects to the cylinder

3.15

valve outlet

section of the valve body (3.8) to which a regulator or connector can be fitted for vapour or liquid withdrawal

Note 1 to entry: The valve outlet is also normally used for filling the cylinder.

3.16

type test

test or series of tests conducted to prove that the design meets the requirements of this document

3.17

cylinder opening

part of the cylinder to which the valve stem (3.14) connects

3.18

test pressure

pressure at which the valve or component is tested

3.19

sediment tube

device designed to reduce the risk of foreign matter, which can be in the cylinder, entering the valve

3.20

sealing cap

device which is intended to seal the external outlet connection of a valve

[SOURCE: ISO 10286:2015, 368]

3.21

sealing plug

device which is intended to seal the internal outlet connection of a valve

[SOURCE: ISO 10286:2015, 369]

3.22

valve operating mechanism

mechanism which closes and opens the valve orifice and which includes the internal and external sealing systems

[SOURCE: ISO 10286:2015, 328, modified — EXAMPLE deleted.]

Note 1 to entry: Normally the valve operating mechanism includes the hand wheel.

3.23

operating torque

torque during opening or closing the valve, after the first half rotation of the hand wheel in opening the valve and before the last half rotation of the hand wheel in closing the valve

3.24

opening torque

initial torque required to open the valve from the closed position

3.25

closing torque

torque required to close the valve and obtain internal leak tightness (3.4)

3.26

valve protection cap

device securely fixed over the valve during handling, transport and storage and which is removed for access to the valve

[SOURCE: ISO 10286:2015, 360]

3.27

valve shroud

integral part of a cylinder which is permanently attached for valve protection during transportation, handling and storage

[SOURCE: ISO 10286:2015, 362]

3.28

valve guard

device securely fixed over the valve during handling transport and storage and which does not need to be removed for access to the valve

3.29

gross mass

total package mass of the heaviest cylinder on which the valve is intended to be fitted, including any permanently attached accessories and the maximum mass of the LPG content

3.30

pressure relief valve

pressure actuated valve held shut by a spring or other means and designed to relieve excessive pressure automatically by starting to open at the set pressure and reclosing after the pressure has fallen below the set pressure

3.31

nominal set pressure

predetermined pressure of the pressure relief valve (3.30) at which the valve is set to start to discharge