Butterfly Valves

Both lugged and wafer butterfly valves of all materials and seat types are easy to use and long lasting as long as they are installed correctly for the appropriate application.

Storage Conditions

  • To protect the seat and seals do not unpack the valves until they are ready for install. By doing this you are protecting the valve from dust and debris which may eventually cause seat leakage.

  • Keep in a cool well ventilated space if storing for a longer period of time
    Valve Installation

  • Valves can be installed in any orientation however it is best if it can be installed upright especially in bigger sizes to reduce load on the shaft caused by the actuator or gearbox trying to pull away.

  • It is common for smaller butterfly valves to be mounted in various orientations eg. water trucks. This is fine and is common practice

  • Verify the material of the butterfly valve, seat and disc before installation. Ensure that there are no defects caused by storage or transportation

  • When installing directly to a pump or another valve be sure to put a spacer or a bit of pipe between them to allow for the butterfly disc to open

  • Complete all welding works before valve installation and be sure the flange has cooled to a sufficient temperature before installing the butterfly valve

  • Make sure there is no welding residue, waste, rust or other debris in the pipe before installation. Wash with water or a mild detergent if needed.

  • Clean the surface of the flange that will come in contact with the butterfly valve to ensure it is free of rust and debris. Wash with water or mild detergent if needed

  • Make sure there is no warpage of the flange or misalignment of the butterfly valve in relation to the flange. This is the most common cause of butterfly valve problems where it is not aligned with the flange/pipe correctly and the disc catches when trying to open/close

  • Install the spacing bolts taking care not to damage the valve seat and adjust the face to face of the two flanges so there is about 3mm space when the piping is spread open. This is enough space to slip the valve in or out.

  • Once the pipes are centred, insert the bolts so that the bottom of the valve can rest upon them to prevent the valve from falling though

  • Before tightening the bolts operate the valve to ensure it does not catch on the pipework or the flange

  • Tighten the bolts one at a time doing it in stages so even pressure is applied and a seal is formed between the valve and flanges

  • Once the installation is complete operate the valve several times to ensure it is free from impingement and it has not moved during installation.
    Maintenance

  • Cycle the valve once a month or more if it is not used regularly

  • Relieve system pressure before maintaining the valve