A Water Hammer Protection Method for Mine Drainage System Based on Velocity Adjustment of Hydraulic Control Valve

Table 1

Times of equipment in single-stage valve-closing.

Equipment actions	Pump start	Valve-opening	Full open	Valve-closing	Valve closed	Water hammer finished	Total times
Times (s)	4.128	7.883	31.590	46.007	67.934	110.500	21.927