Double valve (one built-in, another at outside): used in angle blade, ripper to realize lift, hold , lower, float for the blade cylinder and to realize lift, hold, lower for the ripper cylinder.
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- 双阀(内置):用于直倾铲。可实现铲刀油缸的提升、封闭、下降、浮动,同时实现侧倾缸左侧倾、右侧倾、封闭。