符合GB/T17906-2021General Technical Conditions for Hydraulic Breaking ToolsRelevant national standards。With expansion, clamping, traction and other functions。The main part adopts high-strength lightweight oil cylinder, which greatly improves the expansion tension without increasing the weight。The tail adopts single-interface technology,Liner free design,Supports the replacement tool with pressure。With automatic reversing valve system。The expansion head is made of special alloy steel with stepped anti-slip teeth;Cylinder surface using hard oxidation treatment technology, wear resistance, scratch resistance, high strength, control valve block through continuous5000 test certifications。No-load closing and opening time: 15~18 seconds (with special motor pump)