Product Description
API 16A Annular blowout preventer is manipulated by hydraulic control
system. When it is shut off, high pressure oil flows into piston
underside closed cavity through the oil port in central shell, to
push piston upwards, and the conical surface of piston squeezes
rubber core. Due to the restrictions of head cover, rubber core
can’t go upwards but is pushed towards the center of wellhead until
it encloses drilling tool or enclose wellhead totally to shut the
well. When well needs to be opened, manipulate the reversing valve
of hydraulic control system, so that high pressure oil should flow
into the open cavity on top of piston through the oil mouth on
shell, to push piston downwards and decompress closed cavity, in
which case, the extrusion force on the conical surface of rubber
core is removed, and the rubber core is reset gradually with the
action of its own elastic force to open wellhead.