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1.Such major pressure bearing components as the body and the bonnet are cast formed with alloy steels of high strength and high malleability and properly heat treated. And the water pressure test for strength is performed for each preventer according to the API Spec 16A standards before ex factory.
2. At the bottom of the chamber of the body and the ram there are high brace rods and a desilting slope tilting towards the well bore. So the sands and silts can be removed automatically when the ram is opened and closed. This can reduce the kinetic frictional resistance of the ram and is also helpful to the well pressure assisted sealing of the ram. The internal surface of the ram chamber is smooth and easy to clean.
3. A kind of floating ram sealing is adopted to reduce the resistance in opening or closing the ram, minimize the wearing of the rubber elements and lengthen the service life of the ram. It also prevents the body and ram from rusting together and thus is easy to dismount.