IMO MSC/Circ. 677/1009, MSC.1/Circ. 1324
ISO 15364, ISO 16852
NON-HAMMERING / NON-OSCILLATING
N.D 65 ~ 300
JIS, ANSI, DIN etc FLANGE
WEIGHT LOADED TYPE
Before loading or unloading, the High velocity pressure/vacuum valve must be test lifted to assure the movable pressure, vacuum disc. The check lift is designed to be self-closing.
Loading
When loading, the pressure unit of the SEWON High velocity pressure/ vacuum valve is in operation, Consequently, it must be check lifted by turning the check lift handle from its vertical position to the upper position and automatically back again, before the loading is commenced.
Unloading
When unloading, the vacuum unit may enter operation.
Consequently, it must be check lifted by pushing the vacuum check lift under the vacuum unit and automatically back again to the initial position.