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Pressure balance equipped with a controlled-clearance (CC) piston-cylinder has been developed with the aim of improving hydraulic pressure standards in the pressure range of up to 1 GPa. To estimate the pressure distortion coefficient of the CC piston-cylinder, we performed characterization experiments based on the Heydemann-Welch (HW) model. In this paper, we focused on the change in the piston fall-rate...
We are now developing a new controlled-clearance (CC) pressure balance with the aim of improving the hydraulic pressure standard. The effective areas of the three kinds of CC piston-cylinders, whose maximum pressures are 100 MPa, 200 MPa, and 500 MPa, were estimated based on the Ileydemann-Welch model. To estimate the pressure dependence of the effective area, two characterization experiments, fall-rate...
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