... Water injection and hole-sealing device for coalUsecoal injection,dust-fall,coal pressure reduction,coal-crack.methane drainage,ect.Function1.moisture ... some gas,and reducing the gas content in the coal body.2.It can reduce the 80% dust, ... purpose of hole sealing and coal breaking.2.The device can be used for several times repeatedly,to unload ... device. Water Injection And Hole-sealing Device For Coal