The utility model relates to a prosthetic device, which comprises a wearable body and an air valve arranged on the wearable body.A wearable space is formed by a hollow space in the wearable body, and is provided with a wearable mouth and a first fixing part which are communicated with the outside.The air valve comprises an outer pipe, a valve piece which can be moved up and down through the outer pipe, and an adjusting piece.The outer tube comprises a second fixing part fixed to the first fixing part, a first port connecting the wearable space, a second port connecting the outer part of the wearable space, a large diameter section, a small diameter section and a first connecting part.The minor section is located below the major section and between the major section and the first port.The valve includes a head located in and larger than the small diameter section and a rod extending from the head into the small diameter section.The adjusting part includes a second connecting part which is connected with the first connecting part and is arranged above the head of the valve part at intervals to limit the upward movement distance of the valve part.一種義肢裝置，包含一穿戴套體，及一裝設於穿戴套體的氣閥。穿戴套體內部中空形成一穿戴空間，並具有一連通外部的穿戴口及一第一固定部。氣閥包含一外管、一可上下移動地穿設於外管內的閥件，及一調節件。外管包括一固定於第一固定部的第二固定部，一連通穿戴空間的第一端口、一連通穿戴空間外部的第二端口、一大徑段、一小徑段，及一第一連接部。小徑段設於大徑段下方且位於大徑段與第一端口間。閥件包括一位於大徑段內且大於小徑段的頭部，及一由頭部伸入小徑段的桿部。調節件包括一配合連接於第一連接部的第二連接部，且間隔地設於閥件之頭部上方以限位閥件可向上移動的距離。
