Pistoncleaning. Remove carbon and varnish from piston surfaces. Do not use a caustic cleaning solution or a wire Brush. These could damage the piston-skirt finish.
绝不能使用苛性溶液或金属刷清除活塞表面的积碳和漆膜。因为这样会损坏活塞裙部的粗糙度。
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The valve is rated for continuous duty. 222c Valves have a short stroke water piston for fast response and dual guide areas have self-cleaning action.