Pages

Monday, October 15, 2012

TWO SOV SCHEME


TWO SOV SCHEMATIC (See Scheme Below)

Two sov’s are used in order to have redundant air supply arrangement to valve. Now consider following cases:
  •        Both SOV A & B are Energized: in this case air supply is through SOV A, since SOV B exhaust is blocked because vent port of SOV A is closed.
  •        SOV A Failed and SOV B Energized: Since SOV A is failed so vent/exhaust port of SOV A is now open, hence exhaust of SOV B will go via vent port of SOV A to SOV exhaust port.
  •        SOV A Energized and SOV B Failed: Now SOV B vent port/exhaust port is open and SOV A is in line, but at the time of SOV A  deenergizing vent of SOV A will pass via exhaust port of SOV B to vent port of SOV A. Hence depresurizing the system.




No comments:

Post a Comment

Note: Only a member of this blog may post a comment.