Galvi Engineering Pvt. Ltd. Offers Hydraulically Operated Emergency Callipers. Galvi Engineering Pvt. Ltd. Manufactures Shoe Brakes, Disc Brakes, accessories and rotating components for Shoe Brakes, Disc Brakes, Thrusters, Emergency Callipers and Buffers etc. The Hydraulically Operated Emergency Callipers are designed for emergency applications on discs with maximum peripheral speed of 7 m/s.