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