... type wellhead,integral type wellhead submersible,electric pump wellhead,metal seal wellhead,double-pipe wellhead,multi-seat type wellhead, ... the pipeline crossing hole. Secondary seal of the metal seal wellhead can adopt 'RCMS'type metal seal,the seal is safe and reliable,the ... extending neck is sealed by 'SBMS'metal.Nominal pressure of the metal seal wellhead can reach 20000psi,and the working ...