en856 4sp 四层钢丝缠绕高压液压软管 结构：这种软管由一层耐油、耐水的合成橡胶内胶层，四层以交替方向缠绕的钢丝缠绕层和一层耐油和耐天候的合成橡胶外胶层的构成。 应用：适用于石油基和水基流体的液压系统中，温度范围为-40℃~+100℃ 软管执行：en856-4sp标准 en856 4sp four layer steel wire spiral high pressure hydraulic hose construction：this hose is consist of an inner tube of oil and water resistant synthetic rubber linling,spiral plies of steel wire wrapped in alternating directions,and an oil and weather resistant synthetic rubber cover. applications:this hose for use with petroleum base and water hydraulic fluids within a temperature range of -40℃~+100℃. hose execution: en856-4sp standard