GB/T 14513.3-2020 in English

This standard is equivalent to ISO63583:2014, which specifies the method of determining the steady-state flow characteristics of a pneumatic system by numerical calculation, and can estimate the overall flow characteristics of a system consisting of components and pipelines without actual measurement.

Compared with ISO6358:1989, this standard adopts a 4-parameter model (C, b, m, Δpc) to more accurately describe the flow characteristics, especially for contraction-expansion valves and non-valve components. Improvements to the test equipment include:

• Increasing the diameter of the pressure measurement pipe to directly measure the stagnation pressure
• Introducing the deflation/inflation test method to reduce the energy consumption of testing large-diameter components

Calculation process for series system

1. Calculate the total opening pressure (Equation 19)
2. Determine the blocked mass flow rate (Iterative algorithm in Figure C.4)
3. Establish a subsonic flow curve through 16 flow ratios β_j (Table 3)
4. Least squares method to fit b and m (Equations 32-34)

Special treatment for parallel systems

It is necessary to ensure that the inlet pressure of each branch is the same, the system sonic conductance is the sum of each branch (Equation 37), and the opening pressure takes the minimum value (Equation 38).