Advantages of this hydraulic lock closing seaming machine are that sheet sealing is tight, smooth, fast and safe. All lock seam closing machines include vertical hydraulic, pneumatic and electric lock seam closing machine. As a necessary part of all ventilation air pipe forming machines, the hydraulic sheet metal lock seam closing machine can be operated with other HVAC duct forming machines together to complete a whole duct production, such as TDF flange forming machine, pneumatic TDF sheet metal folding machine, grooving machine, Pittsburgh lockformer machine, electric sheet shearing machine, clips shearing machine, etc.