| 摘要 |
A constant-rate discharge valve adapted so as to render a discharge rate constant includes a housing having an internal air chamber and an open hole open to the atmosphere, first and second air passageways each having one end open to the air chamber and communicating with each other via the air chamber, a control orifice provided in the second air passageway to control air flow rate, and a valve body disposed in the housing so as to partition the air chamber from the open hole. The valve body interrupts communication between the first and second air passageways when pressure in the air chamber is greater than a predetermined pressure and permits communication between the first and second air passageways when the pressure in the air chamber is less the predetermined pressure. An electronic automatic sphygmomanometer using this constant-rate discharge valve discharges air at a constant flow rate.
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