| 摘要 |
PROBLEM TO BE SOLVED: To simplify the mechanical structure and method required for setting a pressure to be read from a pressure gauge. SOLUTION: The pressure measuring device is equipped with a pressure gauge with two functions. The pressure gauge displays pressure values and variably sets the pressure at the same time. Thereby, the spring tube 36 of the pressure gauge is provided with a ventilating opening 52, and the inner space of the spring tube 36 is capable of connecting to the outer air via the ventilating opening 52. In the case when a ventilating valve is opened, operational pressure is decreased, and in the case when the ventilating valve is closed, the operational pressure is increased. The ventilating valve 52 is controlled by the ventilating valve provided for the spring tube 36. The ventilating valve is comprised of a variable closing member 54 connected to the ventilating opening 52. The operational pressure in the spring tube 36 can be varied by adjusting the position of the closing member 54 and an adjustment plane 67 fixed on a pressure gauge housing.
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