| 摘要 |
The present invention relates to a pressure reducing instrument for pressure gauges and includes a cylinder and a piston operable within the cylinder. The piston is designed with a pressure receiving face and a pressurizing face, and includes a plunger fixed on an end portion of a piston. An intermediate member having an atmospheric introductory aperture which penetrates through the plunger and leads to the piston is secured to the cylinder, the introductory aperture being open in an end face portion of the plunger. The instrument further includes a pressure transmitting fluid-retaining portion maintaining the pressure transmitting fluid, a detecting rod penetrated through by an introductory aperture and being received in the pressure transmitting fluid-retaining portion and a clamp member being tightened to the cylinder by a bolt through a rod seal. An end of the detecting rod is capable of connecting with the pressure introductory portion of the pressure gauge, and the introductory aperture for the pressure liquid to be measured in the member becomes to be able to connect with the source of the pressure to be measured by a joint. Furthermore, an area pressed by the piston at the pressure transmitting liquid-retaining portion is enlarged more than an area of the end face of the plunger.
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