STL VALVE/SEAT CATALOGUE GUIDE

      1：Full Open Valves and Seats with Replaceable Insert.    

      2：3 Web Valves and Seats with Replaceable Insert.

      3：Full Open Valves and Seats with Replaceable Insert, Roughneck Style.

      4：4 Web Valves and Seats with Replaceable Insert.

      5：Full Open Valves and Seats with Bonded Insert.

      6：Full Open Valves and Seats with Bonded Insert, Full Surround.      

      7：Well Service Valves and Seats with Replaceable Inserts.

      8：Full Open Valves and Seats with Replaceable Insert, FKN(G2) Style.