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Types of Hinges for uPVC Doors If your uPVC door is hanging or dropping it could be due to hinges. It is possible that you need to replace or adjust the hinges on your uPVC door in order for it to work smoothly. Hinges consist of flat hinge leaves (or plates), knuckles, and a hinge pin. They permit the adjustment of compression and lateral. Butt Hinges When hinges are concerned there are many types and sizes available. Each hinge has its own distinct features to meet different requirements for installation