All About Pneumatic Butterfly Valves Installation

For butterfly valves and other pneumatic valves for various industry needs, call MasterMac 2000.

Butterfly valves, also called flap valves, are regulating pneumatic valves with a simple structure. Butterfly valves are used in many varying fluid services and even perform well in slurry applications. These valves can be used in vacuum, firefighting, gasses, air, cooling water, cryogenics, steam, and liquids services. The valves can be used in all industries and applications even in high-pressure and temperature conditions.

Storage conditions

Do not unpack the valves until they are ready to install to protect the seat and seals. You also protect the valves from dust and debris that may cause seat leakage. If the valve is a crucial spare part and needs to be stored for a long period, keep it in a cool, well-ventilated space.

Valve installation

  • It is best if butterfly valves are installed upright, especially in bigger sizes, to reduce the load on the shaft. This is caused by the actuator or gearbox trying to pull away.
  • It is a safe and common practice for smaller butterfly valves to be mounted in various orientations, as in the case of water trucks.
  • Before installing, verify the material of the butterfly disc, seat, and valve to ensure that there are no defects due to transportation or storage.
  • Verify the valve pressure rating against the application requirement.
  • To allow for proper butterfly disc opening, have a pipe spacer between another valve or the pump when directly installing.
  • Finish all welding jobs before installing the valve. Be sure the flange has cooled to proper temperatures before installing the valve.
  • Before installing, clean out all welding residue, waste, rust, and other debris in the pipe before installation. Clean the surface of the flange that will come in contact with the butterfly valve. Wash the pipe and flange with water and mild detergent if needed.
  • Be sure there is no warpage or misalignment of the flange or the valve in relation to the flange.
  • Make sure there is enough space to remove the valve later for maintenance or replacement. Adjust the facing of the two flanges so there is space when the piping is spread open. Install spacing bolts and take care not to damage the valve seat.
  • Before tightening all bolts, operate the valve to make sure it doesn’t catch on the flange or pipework.

Get your butterfly valves from MasterMac 2000 P/L

MasterMac 2000 is the sole authorised agent and distributor of pneumatic valves such as butterfly valves available from Mack Valves. For Queensland and New South Wales, call us on 07 3344 4711 and ask for high-quality Mack Valves. You can also visit us at to view our complete product lists.

Leave a Comment