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Valves are any of various devices that regulate the flow of gases, liquids, or loose materials through piping or through apertures by opening, closing, or obstructing ports or passageways. Valves are used in a variety of applications including industrial, military, commercial, residential, transportation.A breather valve connected to a breather passage for opening and closing a valve element to adjust the internal pressure of a sealed container corresponding to the pressure change inside the sealed container includes a valve bore, the valve element slidably fitted in the valve bore, a spring for pushing the valve element toward the sealed container, an elastic portion tapering toward the sealed container, a slit formed at the free end of the elastic portion, and a needle member extending from the side opposite to the sealed container toward the slit. Plastic deformation caused by pressure reduction inside the sealed container opens the slit while the needle member projects through and opens the slit when increase of the internal pressure of the sealed container pushes the valve element against the pressure of the spring. An object of the breather valve is to overcome the above-identified problems inherent in the conventional apparatuses and provide an improved breather valve which is simple in construction and small in size. According to the breather valve made to achieve the above object, a breather valve connected to a breathing passage for opening and closing a valve element to adjust the internal pressure of a sealed container, corresponding to the pressure change inside the sealed container, comprises a valve bore connected to the breather passage, the valve element slidably fitted inside the valve bore, a spring for pushing the valve element toward the sealed container, an elastic portion tapering toward the sealed container, the elastic portion being formed on the valve element, a suction and exhaust slit formed at the free end of the elastic portion, the suction and exhaust slit being able to open due to plastic deformation caused therein by pressure reduction inside the sealed container for opening the breather passage, and a needle member extending from the side opposite to the sealed container toward the suction and exhaust slit, the needle member being able to extend into and open the suction and exhaust slit. The breather valve more specifically relates to a breather valve, for connection to a breathing passage of a sealed container to compensate for internal pressure variations of the sealed container, the breathing valve comprising a valve casing, a valve bore extending through the valve casing and communicating with the breathing passage, a valve element slidably received within the valve bore, an elastic portion, supported by an end of the valve element adjacent the breathing passage, tapering away from the valve element, and a suction and exhaust slit being formed in the tapered end of the elastic portion, the suction and exhaust slit opening, due to plastic deformation.
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