Importance

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Abstract

A safety-pressure valve used for covers of air-tight cookers, the safety-pressure valve is able to automatically open for contacting atmosphere when an outward positive pressure or an inward negative pressure in a cooker becomes too large over a safety value, and the pressure in the cooker can be balanced, thereby prevent the cover for the cooker from being damaged because of the overly large negative pressure. The cover is provided thereon with a through hole for receiving the safety-pressure valve, the safety-pressure valve is provided therein with a movable valve which normally is closed; when an inward negative pressure in the cooker becomes too large over the safety value because of lowering of temperature, the movable valve can automatically open to render air to flow into the cooker to balance the pressure in the cooker.

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First Claim