Pavelieva, A., Vasyliev, I., Popov, S. and Vasyliev, A. 2017. The analysis of running efficiency of valve units in differential mortar pump. Technology audit and production reserves. 5, 1(37) (Sep. 2017), 4–9. DOI:https://doi.org/10.15587/2312-8372.2017.112351.