Knowing Subsurface Safety Valve- API14A

Functioning of SSSV
A subsurface safety valve is typically a uni-directional flapper valve, directed
in such a way that the flappers open downwards when pressure is applied
from an upward direction. The flapper can only open in the downward
direction. So even if high pressure is applied by the well fluids from a
downward direction, a safety valve can remain closed. This makes a
subsurface safety valve fail-safe. To open the valve, hydraulic signal is sent
from the surface well control panel. This hydraulic pressure is responsible for
keeping the flappers of SSSV open and loss of hydraulic pressure result in
closing of the valve. Thus wellbore can be isolated in case of system failure or
damage to the surface facilities.
Charlie Chong/ Fion Zhang