Importance

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Abstract

The present invention is directed towards an air relief valve for a pressure vessel which automatically releases air from the system during filling with liquid, and which automatically seals when the liquid in the system reaches a predetermined level to prevent the liquid from leaving the system. The air relief valve of the present invention includes a valve body which provides communication between the pressure vessel and a series of output ports. These output ports are provide with a pressure indicator, a manual pressure release valve, and an automatic air relief valve. The manual pressure release valve is operable by the user to introduce air into the system, which is necessary during draining. The automatic air relief valve is generally a one-way valve, allowing air to exit but not enter the system. Communication of air to the automatic air relief valve is controlled by a float which prevents fluid communication between the pressure vessel and the automatic air relief valve when the water within the system reaches a predetermined level. A second embodiment modifies the automatic air relief valve for use in low pressure situations.

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First Claim