Collapsible portable aluminum frame, solid front, solid rear wheel plastic wheel box, up on the rails, after the hand with self-locking brakes, seat belts.
可折叠便携式铝合金车架,实心前轮,塑料轮框实心后轮,上翻扶手,自锁式后把手连刹车,安全带。
2
Many applications require gate, globe and stop-check valves to use gearing to reduce the handwheel rimpull and thus allow one man to manually seat or unseat the valve.