DETERMINATION OF FLOW-RATE CHARACTERISTICS OF PNEUMATIC REGULATORS USING ISOTHERMAL TANK BY PRESSRE RESPONSE

抄録

ISO 6953: 2000 prescribes that forward flow-rate and outlet pressure until maximum flow-rate shall be measured with a constant inlet pressure and two or more outlet set pressures, and their relations shall be indicated by curves on a graph [1][2]. Since this test requires not only a huge air compressor, but also keeping continuous large flow-rate for a long time, enormous energy is consumed. Thus, this paper proposes a method to obtain flow-rate characteristics from pressure response on charging/ discharging compressed air into/from an air tank as an alternative test. This test method requires none of a huge air source, a long testing time, and enormous energy consumption.
In this paper, the above-mentioned alternative test was performed to some pressure regulators which had differentconstructions and sizes from one another, and it was verified that the results of the alternative test successfully corresponded to the one by ISO 6953 using a flow meter. Examination to optimize the test method was also discussed. The running cost to operate the test, which consists of labor costs based on the test time and energy consumption, was reduced to approximately one-fifth.