Valve Seat Cutting with Neway Valve seat reconditioning is simple, accurate, and clean with Neway’s carbide-bladed cutters. Neway’s user-friendly cutters allow you to precisely machine a multi-angle valve seat in a matter of minutes. Grinding valve seats with stones is a messy process and relies heavily on the finesse of the operator. Grinding also requires the additional task of seat lapping to complete the job. That’s because the surface of a stone is constantly changing as it works, so it can’t create a truly flat surface. Carbide doesn’t change as it works, so there’s no need for lapping. Tungsten carbide leaves a perfectly flat, machined surface, ideal for optimal sealing efficiency and heat transfer.