Manufacturer / Exporter / Supplier Of Low Pressure Reducers, High Pressure Galvanized Pipe, PVS 45 Lateral Tees, PVS Vinyl Coated Pipe, Low Pressure 90 Shoe Taps, Low Pressure Longitudinal Seams, Low Pressure Quadrant Damper, Low Pressure 45 Boot Saddles, Low Pressure Starting Collars, S... Read More
Year of Establishment
1962
Primary Business
Supplier
Number of Employees
10-49
Longitudinal seams which run horizontally on the duct sections are important because these locks must hold the duct pieces securely and tightly and should not leak under pressure. They can be readily and swiftly put together on the job or in the shop. The common type of longitudinal seam is the Pittsburgh Lock Seam. Originally formed in the brake or press brake, today roll forming machines are used to form the pocket on one piece and the flange on the other piece. After one piece is inserted in the pocket, the “tail” in hammered over to close the lock. The Button Punch Snap Lock is a recent innovation. Originally, the continuous snap lock was used on light gauge stove and furnace pipe to permit shipping nested. The pipe section was then snapped together. The button punch spaces the buttons on approximately two-inch centers along the flange to be inserted in the pocket. The continuous sharp fold on the pocket permits the button flange to be snapped into the pocket. The pocket and flange must be formed in a machine suited to the gauge of metal being formed. If this is not adhered to, the pocket will be loose and stiffness and air tightness will be lessened. A final note: Button punch snap lock is not recommended for aluminum.
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