Siab foob li qub yog tsim los rau kev kub siab thiab kev kub siab kev pabcuam feem ntau hauv cov chaw tsim hluav taws xob.Piv nrog rau bolted bonnet li qub, BVMC siab foob li qub yog qhov nyuaj thiab tuaj yeem muab kev pabcuam sealing zoo nrog kev saib xyuas yam tsawg kawg nkaus.