For the Safe-Drive isolation valve, drill one 50 mm (2 in) hole and one 25 mm (1 in) hole to the pipe. Then, remove the bridge between the holes. To help you place the holes correctly, Vaisala delivers an installation guide sticker with the valve.
- Clean the surface of the pipe around the installation area and place the guide sticker across the pipe. Make sure that the flow marker is parallel to the pipe and points to the correct flow direction.
- Disassemble the isolation valve for welding to avoid thermal damage to the isolation valve sealing.
- Drill 50 mm (2 in) and 25 mm (1 in) holes to the pipe and cut the metal away between the holes.
Weld the isolation valve to the pipe.
- The following figure shows welding instructions to a horizontal pipe.