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图6-12所示液压系统中，已知泵1的流量qp1=16L／min，泵2的流量qp2=4L／min，液压缸两腔的工作面积A1=2A2=100cm2，溢流阀5的调定压力py=2．4MPa，卸载阀3的调定压力px=1MPa，工作负载F=20000N，节流阀为小孔，流量系数Cd=0．62，油液密度ρ=900kg／m3。不计泵和缸的容积损失，不计换向阀、单向阀及管路的压力损失，求： 负载为零时活塞的快进速度v；
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