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ISO 15245-1:2021 Gas cylinders — Parallel threads for connection of valves to gas cylinders —Part 1: Specification

李老师 12/12/2021 浏览 596 ISO 15245-1:2021 国际范围

标准简介

Gas cylinders — Parallel threads for connection of valves to gas cylinders —Part 1: Specification是于2021-05发布的ISO标准，适用于国际范围。

标准截图

Gas cylinders — Parallel threads for connection of valves to gas cylinders —Part 1: Specification
Gas cylinders — Parallel threads for connection of valves to gas cylinders —Part 1: Specification(截图)

 

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标准部分原文

Gas cylinders — Parallel threads for connection of valves to gas cylinders —

Part 1: Specification

1 Scope

This document specifies definitions, dimensions and tolerances of parallel screw threads of M30 x 2, M25 x 2 and M18 x 1,5, for the connection of valves to medical and industrial gas cylinders.

This document does not contain the connection requirements for:

— mechanical strength;

— gas tightness;

— capability of repeated assembly and dismounting operations (this aspect is covered in ISO 13341).

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 724, ISO general-purpose metric screw threads — Basic dimensions

ISO 5408, Screw threads — Vocabulary

ISO 10286, Gas cylinders — Terminology

3 Terms a nd definiti ons

For the purposes of this document, the terms and definitions given in ISO 10286, ISO 5408 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www. iso .org/o bp

— IEC Electropedia: available at http://w ww .electropedia. org/ 3.1

valve stem

parallel sided end of valve body, with a thread formed on the external surface with a plain machined section close to the flange on the valve body for O-ring seating and seal

Note 1 to entry: See Figure 1, thread X.

3.2

cylinder neck thread

A

parallel sided axial threaded hole in the cylinder neck

Note 1 to entry: See Figure 2.

Note 2 to entry: This includes a thread formed on the internal surface including a sealing recess for the O-ring and thread relief.

3.3

sealing recess diameter

B

diameter of tapered recess machined in the top face of the cylinder neck, concentric with the cylinder neck thread (3.2), to provide a surface on which the O-ring can seal

Note 1 to entry: See Figure 2.

3.4

sealing recess depth

F

depth of tapered recess machined in the top face of the cylinder neck, concentric with the cylinder neck thread (3.2), to provide a surface on which the O-ring can seal

Note 1 to entry: See Figure 2.

3.5

thread relief diameter

C

diameter of plain machined parallel sided section, concentric with the cylinder neck thread (3.2), between the cylinder neck thread and the sealing recess

Note 1 to entry: See Figure 2.

3.6

distance to start of thread

E

distance from the top face of the cylinder neck to the start of the thread, including recess depth and thread relief length (3.7)

Note 1 to entry: See Figure 2.

3.7

thread relief length

V

minimum length of plain machined parallel sided section on the valve stem (3.1), between the valve stem thread and the flange on the valve body, on to which the O-ring can seal

Note 1 to entry: See Figure 1.

3.8

minimum full thread length

D

minimum distance from the top face of the cylinder neck to the bottom of the cylinder neck thread (3.2)

Note 1 to entry: See Figure 2.

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