Small body,compact structure, ISO9001:2008 Safety valve/ relief valve Coupling Electric motor Model: 3ZSB-135-17Usage: for high pressure water jet assisted rock fall of coal, coal is suitable for soft, pressure, easy to roof collapse in the coal seam, is control fall roof of the most effective wayMedium: Water, emulsion and other liquid similar to water (need contact with us)Pressure: 10-70mpa ( ...