In {HEAD ~ the representative embodiment} of the invention disclosed herein, {TAIL ~ a disc valve} is cooperatively arranged to include a disc member of a ductile material which is transversely positioned within an enlarged chamber in the axial bore of a tubular housing and sealingly secured to the housing 
In { HEAD ~ the representative embodiment } of the invention disclosed herein , { TAIL ~ a disc valve } is cooperatively arranged to include a disc member of a ductile material which is transversely positioned within an enlarged chamber in the axial bore of a tubular housing and sealingly secured to the housing
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