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小松220－3型挖掘机的多路阔组L设有一对供夹抓液压回路用的预留连接间口。该阀口的出口压力通过溢流间可调整至5－12MPa，出阀流量为160－200L／min，恰好与日本NPK公司生产的HC－7液压夯板额定压力和流量相匹配。因此若在挖掘机上改装HC－7夯板十分方便，改装时只需卸下挖掘
Komatsu 220-3 excavator multi-way wide group L is equipped with a pair of reserved connection port for clamping hydraulic circuit. The valve outlet pressure can be adjusted to 5-12MPa through the overflow, the valve flow rate of 160-200L/min, exactly with the Japan NPK Corporation HC-7 hydraulic pressure plate rated pressure and flow rate match. Therefore, it is very convenient to refit the HC-7 rocker on the excavator.