Positive pressure exhalation valve for respiratory protective device

The invention provides a positive pressure exhalation valve which is for use in a respiratory protective device, opens when the inside of a mask body reaches a predetermined pressure, includes a valvebody and a spring that constantly abuts the valve body to bias the valve body toward a valve closing direction, and is adapted such that self-vibration of a vibrating body formed by the valve body and the spring is suppressed. A positive pressure exhalation valve which is for use in a respiratory protective device and opens when the inside of a mask body reaches a predetermined pressure, whereinthe positive pressure exhalation valve includes a valve body, a first spring that constantly abuts the valve body to bias the valve body toward a valve closing direction, and a stopping body that opposes the valve body across a gap from the valve body and abuts the valve body when a vibrating body formed by the valve body and the first valve self-oscillates, thereby suppressing the self-oscillation. 本发明提供一种正压排气阀，其为当面罩体的内部达