BS ISO 6358-1:2013+A1:2020

This part of ISO6358 specifies a steady-state method for testing pneumatic fluid power components that use compressible fluids, i.e. gases, and that have internal flow paths that can be either fixed or variable in size, to determine their flow-rate characteristics. However, this part of ISO6358 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). In addition, it does not apply to components that exchange energy with the fluid during flow-rate measurement, e.g. cylinders, accumulators, etc. Table1 provides a summary of which parts of ISO6358 can be applied to various components. Table1 Application of ISO6358 test methods to components Components Constant
upstream pressure test Variable
upstream pressure test ISO6358‑1
constant upstream pressure test ISO6358‑2 chargetest ISO6358‑1
variable upstream pressure test ISO6358‑2 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 Tubes and hoses yes no no no Group 3 Silencers and exhaust oilmist separators no no yes yes Blow nozzles no no yes yes Quick-exhaust valves no no yes yes Cylinder end heads no no yes yes This part of ISO6358 specifies requirements for the test installation, the test procedure, and the presentation of results for the steady-state method. This part of ISO6358 includes several test procedures, including the one described in AnnexA, which is from ISO6358:1989. Flowmeter calibration is described in AnnexB. Evaluation of measurement uncertainties is described in AnnexC. Observations of the error in the test results are described in AnnexD. Equations and graphical representations of flow-rate characteristics are given in AnnexE. Guidance on the use of practical units for the presentation of results is given in AnnexF. Test results using commercially available pneumatic components are given in AnnexG. Guidance on calculating the flow-rate characteristics is given in AnnexH. A method for evaluating the flow ability of pneumatic components using effective conductance, Ca, is given in AnnexI.