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

Table 3

Measured values of water hammer parameters.

Measured parameters	Acceleration (m/s^2)			Displacement (mm)			Pressure
							(Mpa)
Valve-closing times (s)
22	4.8308	6.4582	5.4457	15.7662	28.5192	15.3051	4.5865
25	4.8207	6.4581	5.4453	15.7515	28.5139	15.3012	4.5564
28	4.7986	6.3215	5.4394	15.7495	28.4632	15.2036	4.4952
31	4.5689	6.1265	5.2563	13.6938	26.8576	13.0369	4.4678
33	4.5389	6.1063	5.1935	13.5963	24.6985	12.6325	4.4612
36	4.3236	5.9638	5.0632	12.6985	23.8965	11.7652	4.2675
39	1.7231	1.1023	1.6352	9.2514	6.3656	11.3251	3.5615
42	1.7016	1.0363	1.5426	9.0356	6.1563	10.9968	3.5423
44	1.6987	0.8692	1.4112	8.9482	5.9354	10.6432	3.5006
48	1.6886	0.8629	1.4003	8.9235	5.9139	10.6365	3.5006