Annular preventer is an important part of BOP equipment, which is designed to control wellhead pressure during drilling, repair and testing of oil and gas wells. It can effectively control wellhead pressure and prevent emissions from wells to ensure safe execution of works.

Universal preventer is used with BOP control station and, as a rule, together with a ram preventer. Design and manufacture of annular preventer manufactured in accordance with API Spec 16A.

Features:

• Packing element is spherical or tapered type with massive storage volume, low operation pressure and excellent sealing function
• Bonnet is hemispherical-shaped, so there is no stress concentration on bonnet , the pressure is evenly distributed; convenient for disassembly and assembly (except FHZ5414)
• Piston is set in low position to have a shorter moving distance; wear ring on piston
• Lip type seal rings are used to realize long service life