THE STUDY OF RUNNING EFFICIENCY OF MORTAR PUMP BALL VALVES ACCORDING TO THE MOTION LAW OF PISTON. Academic journal Industrial Machine Building Civil Engineering, [S. l.], v. 1, n. 40, p. 14–19, 2017. Disponível em: https://ojs35.nupp.edu.ua/znp/article/view/214. Acesso em: 23 dec. 2025.