ISO 10297:2014 ガスボンベ — ボンベバルブ — 仕様とタイプのテスト | ページ 6

3.1

valve operating mechanism

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

Note 1 to entry: In ISO 22435 the valve operating mechanism is called shut-off mechanism.

Note 2 to entry: For some VIPR designs the pressure regulating valve can act as the shut-off mechanism.

3.2

valve design

classification of valves with regard to the valve operating mechanism (3.1)

3.3

valve operating device

component which actuates the valve operating mechanism (3.1)

3.4

external leak tightness

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

3.5

internal leak tightness

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

3.6

valve working pressure

p_w

settled pressure of a compressed gas at a uniform reference temperature of 15 °C in a full gas cylinder or cylinder bundle for which the valve is intended

Note 1 to entry: This definition does not apply to liquefied gases (e.g. carbon dioxide), or dissolved gases (e.g. acetylene).

Note 2 to entry: The valve working pressure is expressed in bar.

3.7

valve burst test pressure

p_vbt

minimum pressure applied to a valve during hydraulic burst pressure test

Note 1 to entry: The valve burst test pressure is expressed in bar.

3.8

valve test pressure

p_vt

minimum pressure applied to a valve during testing

Note 1 to entry: The valve test pressure is expressed in bar.

3.9

handwheel diameter

D

nominal value of twice the largest radius from the centre of the handwheel

Note 1 to entry: The handwheel diameter is expressed in mm.

3.10

minimum torque

T_c

torque necessary to be applied to a valve operating device (3.3) of a newly manufactured valve to obtain internal leak tightness (3.5) at valve test pressure (3.8) and room temperature

Note 1 to entry: The minimum closing torque is expressed in Nm.

3.11

endurance torque

T_e

closing torque applied during the endurance test

Note 1 to entry: The endurance torque is expressed in Nm.

3.11.1

endurance torque at start

T_e,start

endurance torque (3.11) to be applied at the beginning of the endurance test

3.11.2

endurance torque at end

T_e,end

endurance torque (3.11) measured at the end of the endurance test to achieve internal leak tightness (3.5)

3.12

over torque

T_o

opening or closing torque (whichever is the lower value) applied to the valve operating device (3.3) to determine the level of torque which the valve operating mechanism (3.1) can tolerate and remain operable

Note 1 to entry: The over torque is expressed in Nm.

3.13

failure torque

T_f

opening or closing torque (whichever is the lower value) applied to the valve operating device (3.3) to obtain mechanical failure of the valve operating mechanism (3.1) and/or valve operating device (3.3)

Note 1 to entry: The failure torque is expressed in Nm.

3.14

total package mass

combined mass of a gas cylinder (including, for dissolved gases, any porous material and solvent), its valve(s), its permanent attachment(s) and its maximum allowed gas content

Note 1 to entry: Valve guards but not valve protection caps are examples of permanent attachments.

Note 2 to entry: The total package mass is expressed in kg.

3.15

main valve

valve which is fitted to a cylinder bundle’s manifold isolating it from the main connection(s)

3.16

valve inlet connection

connection on the valve which connects the valve to the cylinder(s)

3.17

valve outlet connection

connection on the valve used to discharge the cylinder(s)

Note 1 to entry: For most valves this connection is also used for filling the cylinder(s).

3.18

valve filling connection

connection on the valve used to fill the cylinder(s)

Note 1 to entry: For some valves (e.g. VIPRs) the valve filling connection is different from the valve outlet connection.

3.19

NTP

normal temperature and pressure

[SOURCE: 20,0 °C (293,15 K), 1,013 bar absolute (0,101 3 MPa absolute)]