Connecting spherical-type expansion joints to butterfly valves and/or wafer check valves can lead to damage or premature failure of your expansion joints. Proco Products, Inc. recommends installing spherical-type expansion joints against flat face flanges when at all possible.
A butterfly valve disc may come in contact with the I.D. of the mating spherical expansion joint body as it opens and rubs or cuts into the rubber element causing premature failure. Reduced sealing surfaces of butterfly or wafer check valves used in conjunction with beaded end spherical-type expansion joints connection can leak or fail during surge conditions.
Please review Proco Products, Inc. Installation Instructions for more information.