Product Sheet O-Series Subs
General-service equalizing subs with working pressures to 5,000 psi [34.5 MPa].
O and O-1 equalizing subs connect a C- or M-series lock to an equalizing sub to equalize differential pressures across slickline-retrievable subsurface controls before retrieving the controls from the tubing string.The difference between the O and O-1 subs is that the O-1 sub has internal threads to receive chokes.
These subs are designed for use in sweet to moderately corrosive environments.
The O or O-1 sub acts as a crossover sub by converting the thread size of the C- or M-series lock to that of the equalizing sub or velocity-type safety valve. A pin in the upper end of the O-series subs holds the locking ratchets in place on the C- or M-series lock.