Butterfly valve having metal-to-metal sealing with conical angle
Butterfly valve of inspectable type
Butterfly valve of large diameter
Butterfly valve seal retainer
Butterfly valve sealing means having an improved O-ring groove
Butterfly valve seat
Butterfly valve structure
Butterfly valve thruport seal
Butterfly valve with a sealing element of elastomeric material w
Butterfly valve with an improved obturation device
Butterfly valve with improved shaft connection
Butterfly valve with low noise
Butterfly valve with offset bearings
Butterfly valve with self locking disc
Butterfly valves
Butterfly-type control valves having non-circular valve members
Butterfly-valve
Butterfly-valve assembly having an admission passage of progress
By-pass ball valve