... preventer actuator ways: manual, hydraulic end connection: flange,studden working pressure:2000~20000psi DN:90~346 The BOP has a single ... , sealing parts, ram, etc., and its working principle is: high-pressure oil into the cylinder closed cavity around, the push piston, piston ... to achieve the purpose of pumping wells; when the high pressure oil into the cylinder about to open chamber, the left and ...