There are two structure model of annular BOP, model A: tapered rubber; model D: spherical rubber.
1.Used in conjunction whit hydraulic control system,the annular BOP seals off the annulus of different sizes when pipes are in use in the hole.
2.Upper housing and the body have two connection forms as connection by bolts and connection by claw chuck.
3.Annular BOP with tapered rubber is composed of seven parts as upper housing,wear plate,body,piston,tapered rubber,anti-dust ring and supporting cylinder.
4.The dynamic seal of annular BOP adopts the sealing ring of lip structure,which reduces the wearing of sealing ring to the maximum,and the sealing is reliable;the rubber is not easy to fold back,and there is the effect of funnel;and the well pressure has the function of assisting sealing,etc.