to be tightly held in the valve body at all times even under stress conditions brought about due to pressure increases in the valve the dynamic sealing relationship afforded by the present invention is shown in fig3 of the drawings fig3 illustrates the same valve as depicted in fig1 and 2 except that the valve 3 is subjected to an elevated pressure in one or more of the conduits 16 as can be seen from fig3 the elevated pressure in any one of the conduits 16 can be transmitted to the slots 40 to thereby cause the plug 14 to become displaced upwardly in the body socket 22 as the displacement of the plug 14 occurs the third or bearing surface 34 of the flange 28 continuously engages the bearing surface 46 of the engaging ear 44 to constantly urge the flange 28 toward the plug 14 as soon as the elevated pressure is removed from the system the elastic memory of the flange portion 42 of plug 14 causes the flange portion 42 to return to its original configuration as shown in fig2 and thereby displace plug 14 into the body socket 22 during the time that the elevated pressure is present in the system the seal between the plug and the body is continuously maintained because.