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.

• 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。