Title:
SMALL-VOLUME PROVER
Document Type and Number:
Japanese Patent JP3124742
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a small-volume prover which can stably detect leakage from a seal section between the internal surface of a cylinder and the external surface of a piston by obtaining the pressure suitable for detecting the leakage.
SOLUTION: A valve plug piston 5 and a weighing piston 3 are put in a cylinder 2 housed in a cylindrical enclosure 1. The calibration of a flowmeter to be calibrated is performed by discharging a fluid by a standard volumetric flow rate, which is specified by the cylinder 2 and a weighing piston 3 by moving the piston 3 by a prescribed distance while the valve plug piston 5 is closed. U-shaped rings 7, 8, and 9, and 10 which maintain the watertightness of the pistons 3 and 5 are installed, with their opened ends being directed toward the flowing-in side. In addition, a tapered section which is formed so that the diameter of the section becomes larger toward a flowing-in side hole 6, and d flowing-out side hole 12 is provided on the internal surface of the cylinder 2. The leakage from the seal sections is detected from the sealing pressure, when the rings 8 and 10 move to a straight line section from the tapered section.
Inventors:
Yu Ogawa
Hajime Iida
Takehiro Hatanaka
Hajime Iida
Takehiro Hatanaka
Application Number:
JP22217497A
Publication Date:
January 15, 2001
Filing Date:
August 19, 1997
Export Citation:
Assignee:
Oval Co., Ltd.
International Classes:
G01F25/00; G01F11/04; (IPC1-7): G01F25/00; G01F11/04
Domestic Patent References:
| JP1131419A |
Attorney, Agent or Firm:
Akichika Takano