| 摘要 |
Disclosed is an automatic decompression valve for sphygmomanometer with an extension spring, which can decompress pressure at a constant without control of the decompression vale of the sphygmomanometer, and be used uprightly regardless of a peripheral circumstance. The automatic decompression valve includes: a valve body having an inlet through which air is introduced from a cuff therein, and an outlet through which the introduced air is exhausted; a piston having a piston shaft for moving toward the outlet in the valve body; a spring having one end connected to the piston; a three-way valve provided with a connector with which the valve body is assembled, and air inlet and outlet, the three-way valve being connected to the other end of the spring; and a support for supporting the three-way valve.
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