Price of the butterfly head, non-standard torispherical head http://www.hebftc8.com/ Phone 0317-8210122, Mobile 13722724665 A method for nuclear reactor with parabolic protective effect of whole head assembly by parabolic protection The cover will be removed from the container head upgrade and enhance the standard head assembly to enhance rigging lifting column, and other components of the overall GB head assembly with the separation of the head assembly. Parabolic shield can also be removed in the top flange at the annular support member connected to the head, connected at the bottom flange of the pressure container is formed on the upper side of the ring, a heat insulator integrally disposed on the inner surface of the protective cover. The lifting column is connected with the head in the head to enhance the work support the weight of the head, almost does not bear the weight of the head in the cylinder. Thus improving the safety and economy of the head lifting and reactor operation.