Patent ID: 8733737

Claim:
A seal for a surge relief valve, comprising: a) a valve housing having a flow inlet and a flow outlet; b) an annular retainer for coupling a plug to an interior of the valve housing, the retainer having a first end oriented toward the flow inlet and a second end remote therefrom, the retainer having a plurality of bores disposed periodically around the retainer passing from the first end through to the second end; c) the plug having a first end oriented toward the flow inlet and a second end remote therefrom, the plug having a mating junction for coupling with the second end of the retainer, the plug having a counterbore, a groove, a first lip defined between the counterbore and the groove and a second lip adjacent the groove, wherein the plug includes a plurality of threaded bores disposed periodically the counterbore to receive a corresponding plurality of threaded bolts, the threaded bores being in cooperative alignment with the bores disposed through the retainer, wherein the retainer is fastened to the plug via the plurality of threaded bolts extending through the corresponding plurality of bores in the retainer and mating with the corresponding threaded bores in the plug; d) an annular plug seal having a first end oriented toward the flow inlet and a second end remote from the first end for mating with the groove and a lip that abuts an outer retainer, wherein the plug seal further comprises a bump proximal to the first end and the bump having a top surface extending annularly inwardly and parallel to a plane of the plug seal and the bump having an angled surface extending radially outwardly from a tip of the bump towards the second end, the angled surface having an angle θ at an intersection of the top surface with the angled surface such that the angle θ is between about 40 and 50 degrees; and e) an annular groove disposed about the first end of the plug seal proximal to the bump.