ISO 11363-1:2018 ガスボンベ — バルブをガスボンベに接続するための17Eおよび25Eテーパーねじ — Part 1: 仕様 | ページ 2

3.1.1

basic profile

theoretical profile, when the profile of the external thread coincides with the profile of the internal thread

3.1.2

design profile

profile which differs from the basic profile due to the radius of the root, necessary for manufacturing and strength requirements

Note 1 to entry: For such a profile, manufacturing tolerances are taken into account.

3.1.3

length of external thread

l₂

length of full form thread on the valve stem (3.1.8) , measured along the cone axis from the reference plane A (3.4.3)

Note 1 to entry: See Figure 1, Table 1 and Table 3.

3.1.4

length of internal thread

L₂

length of full form thread in the cylinder neck, measured along the cone axis from the reference plane F (3.4.5)

Note 1 to entry: See Figure 1, Table 2 and Table 4.

3.1.5

pitch

P

distance, measured parallel to the cone surface, between two homologous points of two parallel consecutive flanks of the same thread

Note 1 to entry: See Figures 2 and 3.

3.1.6

taper

ratio of the difference of two diameters corresponding to planes normal to the axis of the reference cone, and the axial distance between the same planes

Note 1 to entry: Taper can be expressed as a ratio, as an angle or as a percentage.

3.1.7

thread profile

thread shape obtained by the intersection of a plane through the thread axis and the threaded surface

3.1.8

valve stem

tapered end of the valve body (inlet connection), with a thread formed on the external surface of the truncated cone

Note 1 to entry: See Figure 1.

3.1.9

cylinder neck thread

tapered axial hole in the cylinder neck, with a thread formed on the internal surface of the truncated cone

Note 1 to entry: See Figure 1.

3.2.1

major cone

cone bounding the crests of the thread of the valve stem (3.1.8) , or the roots of the cylinder neck thread (3.1.9)

3.2.2

minor cone

cone bounding the roots of the thread, of the valve stem (3.1.8) , or the crests of the cylinder neck thread (3.1.9)

3.2.3

pitch cone

cone passing coaxially and midway between the major (3.2.1) and minor cones (3.2.2)

3.3.1

major diameter

d_1e

diameter of the major cone (3.2.1) at the valve stem (3.1.8) thread reference plane A (3.4.3) (before any chamfer is cut)

3.3.2

major diameter

D_1e

diameter of the major cone (3.2.1) at reference plane G (3.4.6)

3.3.3

minor diameter

d_1i

diameter of the minor cone (3.2.2) at the valve stem (3.1.8) thread reference plane A (3.4.3) (before any chamfer is cut)

3.3.4

minor diameter

D_1i

diameter of the minor cone (3.2.2) at reference plane G (3.4.6)

3.3.5

pitch diameter

d_1p

diameter of the pitch cone (3.2.3) at the valve stem (3.1.8) thread reference plane A (3.4.3) (before any chamfer is cut)

3.3.6

pitch diameter

d_2p

diameter of the pitch cone (3.2.3) at reference plane B (3.4.4)

3.3.7

pitch diameter

D_1p

diameter of the pitch cone (3.2.3) at reference plane G (3.4.6)

3.3.8

pitch diameter

D_2p

diameter of the pitch cone (3.2.3) at reference plane F (3.4.5) (before any chamfer is cut)

3.4.1

reference length

l₁

reference dimension being the distance between the parallel reference planes A (3.4.3) and B (3.4.4)

3.4.2

reference length

L₁

reference dimension being the distance between the parallel reference planes F (3.4.5) and G (3.4.6)

3.4.3

reference plane A

reference plane coincident with the small end face of the threaded valve stem (3.1.8) and corresponding to diametersd_1i (3.3.3), d_1p (3.3.5) and d_1e (3.3.1)

3.4.4

reference plane B

reference plane at a distance l₁ (3.4.1) from reference plane A (3.4.3) and corresponding to diameterd_2p (3.3.6)

3.4.5

reference plane F

reference plane coincident with the entry section face of the cylinder neck thread (3.1.9) and corresponding to pitch diameterD_2p (3.3.8)

3.4.6

reference plane G

reference plane at a distance L₁ (3.4.2) from reference plane F (3.4.5) and corresponding to diameterD_1e (3.3.2) , D_1p (3.3.7) and D_1i (3.3.4)