DeZurik KGC Valves have a unique packing system that ensures a long-life tight seal with minimal packing gland pressure.是什么意思_DeZurik KGC Valves have a unique packing system that ensures a long-life tight seal with minimal packing gland pressure.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句