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  • BSI
    BS ISO 6358-2:2019 Pneumatic fluid power. Determination of flow-rate characteristics of components using compressible fluids - Alternative test methods
    Edition: 2019
    $500.66
    / user per year

Description of BS ISO 6358-2:2019 2019

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; ISO 6358-1 does provide such a method.

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.



Standard NumberBS ISO 6358-2:2019
TitlePneumatic fluid power. Determination of flow-rate characteristics of components using compressible fluids - Alternative test methods
StatusUnder Review
Publication Date2019-09-16
ReplacesBS ISO 6358-2:2013
Identical National Standard OfISO 6358-2:2019
DescriptorsTest equipment, Grades (quality), Testing conditions, Formulae (mathematics), Pneumatic transmission systems, Fluid equipment, Fluid equipment components, Flow rates, Errors, Accuracy, Pneumatic equipment, Compressible flow, Flow measurement
ICS23.100.01 Fluid power systems in general
CommitteeMCE/18/-/5
ISBN978 0 539 00327 7
PublisherBSI
Pages50

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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