الوصف

Structure Characteristics

1. The connection between top cap and housing, top and bottom ends adopt flanges and bolts.

2. Semisphere rubber core has many advantages, such as not easy folding back, big volume of rubber storage. Under the well pressure,the piston pushes the rubber core upward to form a funnel shape. The funnel effect of rubber core increases its sealing performance and life span.

3. Characteristics of the sealing structure

1)The BOP has three important sealing positions: piston external surface seal, piston internal surface seal and mud blocking ring seal.

2)Radial direction cross section of the piston comes of the shape "Z", which makes the piston have short stroke length, low height and big diameter