1:Water injection and hole-sealing device 2.ISO9001:2000 3:Working flow:4~4.5 tons of water per hour 4:Hole sealing:30~120mm Water injection and hole-sealing device for coalUsecoal injection,dust-fall,coal pressure reduction,coal-crack.methane drainage,ect.Function1.moisture enters into coal mass,releasing some gas,and reducing the gas content in the coal body.2.It can reduce the 80% dust,improve ...