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ISO FDIS 6358-2 2013 Edition, January 17, 2013 PNEUMATIC FLUID POWER - DETERMINATION OF FLOW-RATE CHARACTERISTICS OF COMPONENTS USING COMPRESSIBLE FLUIDS - PART 2: ALTERNATIVE TEST METHODS
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Description / Abstract:
This part of ISO 6358 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 part of
ISO 6358 does not apply to components whose flow coefficient is
unstable during use, i.e. components that exhibit remarkable
hysteretic behaviour (because they may contain flexible part 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, etc.
NOTE This part of ISO 6358 does not provide a method to
determine if a component has hysteretic behaviour; ISO 6358-1 does
provide such a method. The charge test cannot be performed on
components that do not have downstream port connections.
This part of ISO 6358 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 equation for calculating
characteristics is given in Annex E. Guidance on calculation
flow-rate characteristics is given in Annex F.