它的控制部分采用双轴承结构。
The control part of tube expander adopts the structure of double bearings.
型阀采用双轴承结构，机械稳定性高，启动扭矩小，保证了阀门具有极好的灵敏度和感应速度。
V-valve dual-bearing structure, mechanical stability, high starting torque is small, to ensure the valve sensor with excellent sensitivity and speed.
车架阳极氧化，小轮轴采用双轴承，带减震橡胶，较座，8“前轮，24”后轮，双支撑，附安全带。
Aluminum oxidation frame, soft cushion, 8 "front caster and 24" rear wheel, double brace, whit safety belt.
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