安裝在鍋爐給水管道上或高加疏水管道上，供調節(jié)給水流量。                                                         1.閥門主要由閥體.閥座.閥瓣.閥桿.閥蓋等組成。                                                                               2.閥門的流量調節(jié)是靠圓筒形的閥瓣相對閥座回轉改變閥瓣上窗口來實現(xiàn)。                                                                                                                                         3. 閥門的開.關范圍為60度，由閥門上方的開度指示板來指示