HXF-J-1型单呼阀HXF-J-2型阻火单吸阀规格DNDNDNDNDNDNH270400400470550620H1340470470540620700L290420420535700835HXF-J-M1型密闭单吸HXF-J-M2型密闭阻火单吸阀规格DN70DN70DN70DN70DN70DN70DN70H250400400400550620700H1320470470470625700780H2110160160160250290320H3180270270270320370400L300420420520650760880L1165250250250400480550)