In a preferred embodiment of the invention, an accessory safety valve is provided for mounting within outlet-ports of tanks designed to contain pressurized gas of some sort, particularly of an explosive or caustic nature, REDUCING VALVESto replace the conventional outlet conduit normally mounted in such tanks which normally have the on-off valve exterior to the tank devoid of any safety back-up feature, the present accessory safety valve having the pressure-responsive safety mechanism mounted within the end of the conduit passage that extends totally inside the tank totally beyond exterior-mounting male thread to the conduit,Water Pump Control Valves placing the valve and valve set therefor thereby in a removed position protected against damage and failure in the event of an exterior-tank blow or impact against portions of the conduit mounted exterior to the tank. Ball ValvesA safety valve comprising in combination: a housing structure means for supporting and mounting valve structure, having a through-passage and passage inlet and outlet openings thereto, including an inner valve structure having a first valve seat in juxta-position to said inlet opening structured and positioned to seat a valve movable in a direction of said outlet opening toward a seating position and the first valve seat including valve guide-support structure adapted to support a valve in an open state and to guide the valve toward and support the valve in a seated state; said housing structure means including external male threads adapted for inserting the passage inlet opening-end of said housing structure means into a female-threaded aperture, the external male threads being formed on said housing means encircling the housing structure and the external male threads being located at least at a first point spaced-away from said passage inlet opening-end at a position beyond and spaced from said valve guide-support structure along an axial direction of said through-passage, and the external male threads continuing from said first point toward said passage inlet opening-end; and a first valve means for being supported by and guided by said guide-support structure and for sealably seating in a closed state onto said valve seat and for being supported by the valve guide-support structure in an open state, the first valve means including guide-following structure of a shape adapted to follow said valve guide-support structure and being of a length dimension along an axis parallel to said through-passage at the inlet opening such that the guide-following structure at a distal terminal end thereof is spaced-away from said first point toward said passage inlet opening-end, whereby said guide-support structure and said guide-following structure are located fully within a tank when the housing structure is mounted at said first point by said external male threads with the female-threaded aperture.

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