BF型單法蘭松(song)(song)套(tao)(tao)限(xian)(xian)(xian)位(wei)(wei)補(bu)償(chang)接頭是在AF型法蘭松(song)(song)套(tao)(tao)補(bu)償(chang)接頭的基礎上增設限(xian)(xian)(xian)位(wei)(wei)伸縮管(guan)(guan)及(ji)限(xian)(xian)(xian)位(wei)(wei)螺柱而(er)成，最大伸縮量處用雙螺母(mu)鎖定，補(bu)償(chang)因(yin)熱脹冷縮和地基沉降(jiang)引起(qi)的管(guan)(guan)線軸向(xiang)位(wei)(wei)移及(ji)撓曲和偏心，從而(er)保護閥(fa)門的設備。