It has a lightweight design, vibration and impact resistant construction, and integral barbed fittings molded into each body ported 'rb' valve.
它有一个轻巧的设计，振动和耐冲击性建设，整体刺到每个机构移植'模包'阀门配件。
2
Integral lifting main body of a shield machine is a quick and simple shield machine transit method through subway stations, and can save subway station construction costs.