ISO 6358-2:2019
Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 2: Alternative test methods

Standard No.

ISO 6358-2:2019

Release Date

2019

Published By

International Organization for Standardization (ISO)

Latest

ISO 6358-2:2019

Scope

This document specifies a discharge test and a charge test as alternative methods for testing pneumatic fluid power components that use compressible fluids, i.e. gases, and that have internal flow passages that can be either fixed or variable in size to determine their flow-rate characteristics. However, this document does not apply to components whose flow coefficient is unstable during use, i.e. components that exhibit remarkable hysteretic behaviour (because they can contain flexible parts that deform under the flow) or that have an internal feedback phenomenon (such as regulators), or components that have a cracking pressure such as non-return (check) valves and quick-exhaust valves. In addition, it does not apply to components that exchange energy with the fluid during flow-rate measurement, e.g. cylinders, accumulators. NOTE This document does not provide a method to determine if a component has hysteretic behaviour; Table 1 provides a summary of which parts of the ISO 6358 series can be applied to various components. Table 1 — Application of the ISO 6358 series test methods to components Components Constant upstream pressure test Variable upstream pressure test constant upstream pressure test charge test variable upstream pressure test discharge test Group 1 Directional control valves yes yes yes yes Flow control valves yes yes yes yes Connectors yes yes yes yes Valve manifolds yes yes yes yes Group of components yes yes yes yes Group 2 Filters and lubricators yes no no no Non-return (check) valves yes no no no Quick-exhaust valves yes no no no Tubes and hoses yes no no no Group 3 Silencers and exhaust oil mist separators no no yes yes Blow nozzles no no yes yes Cylinder end heads no no yes yes The charge test cannot be performed on components that do not have downstream port connections. This document specifies requirements for the test installation, the test procedure, and the presentation of results.  Evaluation of measurement uncertainties is described in Annex A. Requirements for a method to test the volume of an isothermal tank are given in Annex B. Guidance on the isothermal tank is given in Annex C. Requirements for a method to test isothermal performance are given in Annex D. Guidance on the formula for calculating characteristics is given in Annex E. Guidance on calculating flow-rate characteristics is given in Annex F.

ISO 6358-2:2019 Referenced Document

• ISO 1219-1 Fluid power systems and components — Graphical symbols and circuit diagrams — Part 1: Graphical symbols for conventional use and data-processing applications AMENDMENT 1
• ISO 5598 Fluid power systems and components — Vocabulary*， 2020-01-06 Update
• ISO 6358-1 Pneumatic fluid power*， 2024-03-01 Update

ISO 6358-2:2019 history

• 2019 ISO 6358-2:2019 Pneumatic fluid power — Determination of flow-rate characteristics of components using compressible fluids — Part 2: Alternative test methods
• 2013 ISO 6358-2:2013 Pneumatic fluid power.Determination of flow-rate characteristics of components using compressible fluids.Part 2: Alternative test methods