2026-09-17
A vulcanized seat butterfly valve has its resilient rubber seat cured and bonded directly to the valve body. For the seat to seal correctly over thousands of cycles, it must stay in exactly the right position during molding, assembly, and operation. The stop shoulder, also called a locating shoulder or seat stop, is the machined shoulder inside the body that positions the vulcanized seat, controls how much the seat compresses, and protects it from being over-loaded by the disc.
