Center line butterfly pneumatic valve type

center line butterfly pneumatic valve is a butterfly valve structure is sealed type center vertical plate, the butterfly plate and pneumatic seat ° circumferential concentric ( The midline, two-way sealing function, then the following to conclude center line butterfly pneumatic valve type!
the midline wafer manual adjustment pneumatic valve: DX, DF, DF, DF, DF/P, DF
the midline wafer worm gear transmission control pneumatic valve: DF, DF, DF, DF/P, DX
the midline wafer pneumatic butterfly valve, DF, DF, DF, DF/P, DX
the midline wafer pneumatic valve, electric butterfly DF, DF, DF/P, DF, DX
flange connection manual adjustment of the midline pneumatic valve: DX, DF, DF, DF/P, DF
flange connection worm gear drive center line butterfly pneumatic valve: DX, DF, DF, DF/P
flange connection pneumatic center line butterfly valve: DX, DF/P, DF, DF
flange connection electric center line butterfly pneumatic valve: DX, DF/P, DF, DF
other center line butterfly pneumatic valve: DH, DW
is above the centerline of the common control pneumatic valve type.