ISO 11117:2019/Amd 1:2026

ISO 11117:2019/Amd 1:2026 is an ISO amendment to the standard for gas cylinders - valve protection caps and guards. It updates design, construction and test provisions for these protective devices, with specific changes to thread dimensions, dimensional definitions and the way changes to valves are assessed. It is aimed at manufacturers, designers, test laboratories and others who work with valve protection caps and valve guards for gas cylinders.

What does ISO 11117:2019/Amd 1:2026 specify?

ISO 11117:2019/Amd 1:2026 specifies changes to ISO 11117:2019, which covers valve protection caps and valve guards for gas cylinders. The amendment revises selected clauses in the design, construction and test requirements so they can be applied consistently in practice.

The amendment is organized as targeted replacements in Clause 4, Clause 7 and Clause 9. It updates Figure 5, Tables 3 and 4, and several text paragraphs that affect how valve protection caps and valve guards are described, dimensioned and re-evaluated after design changes.

What are the key requirements of ISO 11117:2019/Amd 1:2026?

ISO 11117:2019/Amd 1:2026 mainly refines how typical North American threads are defined and how valve changes are handled during assessment. In practice, these updates matter because they affect fit, interchangeability and the decision on whether a design change triggers renewed testing.

Thread dimensions and tolerances

Clause 4.3 replaces Figure 5, Table 3 and Table 4 with updated information for typical North American threads. The amendment gives the dimensions and tolerances used for valve protection cap or valve guard threads and cylinder neck ring threads.

For manufacturers, this means the thread form and its permitted variation need to match the updated figures and tables when designing or checking parts. For buyers and inspectors, it provides the reference used to judge whether a cap or guard fits the cylinder neck ring as intended.

Maximum dimensions and dimensional envelope

Clause 7.1 replaces the wording on maximum dimensions so it refers to either maximum dimensions or a maximum dimensional envelope. Clause 7.2 e) 2) expands the description of a valve guard dimensional envelope to include external dimensions and the arrangement of physical features.

In practice, this matters because a valve guard is not described only by a few linear dimensions. The external shape and feature layout can be part of the acceptance basis, which helps avoid ambiguity when comparing a design against the standard.

Further evaluation after valve changes

Clause 7.7.8 adds that changes to the valve design, such as material, connections or handwheel, do not by themselves require further evaluation for valve protection caps and valve guards. However, for valve guards, added or moved physical features on the protected valve, compared with the original test valve, require further evaluation to decide whether the drop test has to be repeated.

Clause 7.7.9 similarly states that additional valve design changes, including material, connections, handwheel, or changes to the position, arrangement or orientation of physical features, require further evaluation to decide if the drop test needs repeating.

For users, this is a practical decision rule. It helps determine whether an apparently small valve modification is acceptable under the original test evidence or whether new drop testing is needed.

Clause 9 editorial change

Clause 9 removes items b) and c) and renumbers the list that follows. This is a structural change to the document’s final requirements list.

What terms does ISO 11117:2019/Amd 1:2026 define?

The amendment uses several core terms from the parent standard.

• Valve protection cap - a protective device fitted to protect the valve of a gas cylinder.
• Valve guard - a protective device that shields the valve area, with its external features and envelope relevant to compliance.
• Cylinder neck ring - the cylinder feature used in the thread relationship shown in Clause 4.3.
• Dimensional envelope - the external dimensional outline used to define a valve guard’s allowed space and feature arrangement.
• Drop test - the test used to judge whether the protective device and protected valve arrangement performs adequately after changes.
• Physical features - external details such as gauges or filling connection locations that can affect whether further evaluation is needed.

Who uses ISO 11117:2019/Amd 1:2026?

ISO 11117:2019/Amd 1:2026 is used by gas cylinder and valve protection device manufacturers, product designers, quality managers, and test laboratories. It is also relevant to conformity assessment teams and purchasers who need to check that a valve protection cap or valve guard design follows the updated dimensional and test-evaluation rules.

What changed in ISO 11117:2019/Amd 1:2026 from the previous edition?

ISO 11117:2019/Amd 1:2026 is Amendment 1 to ISO 11117:2019. It updates the thread figures, tables and tolerances in Clause 4.3, clarifies how maximum dimensions and dimensional envelopes are described in Clause 7, revises the conditions for further evaluation after valve design changes in Clause 7.7.8 and 7.7.9, and removes items b) and c) from Clause 9.

What does the ISO 11117:2019/Amd 1:2026 document contain?

This amendment contains replacement text and replacement graphics rather than a full rewrite of the base standard. It provides an updated Figure 5 and revised Tables 3 and 4 for typical North American threads, which are used for design checking and fit verification.

It also contains revised instructions in Clause 7 on how to describe maximum dimensions and dimensional envelopes, especially for valve guards. These paragraphs support design definition and documentation when a product is assessed against the standard.

The amendment further includes updated guidance on when changes to a valve require more evaluation and when the drop test may need to be repeated. That makes the document useful for design changes, product approval work and test planning.