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Homepage>BS Standards>23 FLUID SYSTEMS AND COMPONENTS FOR GENERAL USE>23.100 Fluid power systems>23.100.01 Fluid power systems in general>BS ISO 6358-2:2019 Pneumatic fluid power. Determination of flow-rate characteristics of components using compressible fluids Alternative test methods
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BS ISO 6358-2:2019 Pneumatic fluid power. Determination of flow-rate characteristics of components using compressible fluids Alternative test methods

BS ISO 6358-2:2019

Pneumatic fluid power. Determination of flow-rate characteristics of components using compressible fluids Alternative test methods

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Standard number:BS ISO 6358-2:2019
Pages:50
Released:2019-09-16
ISBN:978 0 539 00327 7
Status:Standard
DESCRIPTION

BS ISO 6358-2:2019


This standard BS ISO 6358-2:2019 Pneumatic fluid power. Determination of flow-rate characteristics of components using compressible fluids is classified in these ICS categories:
  • 23.100.01 Fluid power systems in general

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.