AIRBANK

 Disadvantage of the screw type diaphragm valve

  - Tedious and complicated work for cutting, welding, tapping

  - Require rubber hose to correct error caused by thermal expansion during welding

  - Operational error caused by particle and corrosion due to moisture inside header tanks

  - Pressure loss between valve on air header tanks and blow tube

  - Air leak by welding failure

 Disadvantage of the coupling type diaphragm valve

  - Same problem with screw type diaphragm valve

  - Completely make a screw when you install, otherwise unfixed valve can come out and cause 

     the personal injury

 Disadvantage of the flange type diaphragm valve

 - Tedious and complicated work for cutting, welding, tapping

 - Operational error by particle and corrosion due to moisture inside header tanks

 - Air leak by welding failure

 - Costly and time consuming for bolting