Fully welded ball valve Free-valve's fully welded ball valve are widely used in almost all the industry .Compared to the general casting ball valve, fully welded ball valve have a highly performance and longer life time . It was widely used in city gas , city heat supply , oil chemical industry, ship building , steel , power plant etc . Fully welded ball valve can be reliable run in the long time , easy to be installed and less maintenance work . Benefits 1.Valve body material is the same as the pipe material , so they will not occur transformation due to unbalanced stress . 2.Face to face dimensions can be made according to customer requirement. 3.Material of valve seat is made up of ptfe+20%c sealing ring and metal sealing , which can adapt to the change of pressure and temperature, so the leakage will not occur during the pressure and temperature range. 4.The ball body has a highly machining precision due to the tracking of computer detector, so the ball valve was shut off/shut on conveniently. Valve specification Type : frq61fc, frq361fc Size range:nps2~nps48 , dn50 ~dn1200 Pressure range :class150~class600, 1.6mpa~4.0mpa Material of valve body: a105, f304, f316 Connect method :welding Design standard:asme b16.34, api6d Test and inspect:api598 Face to face:asme b16.10 Medium :water , oil , gas , acid , alkaili etc Driving method : electric , handle, worm gear etc . Application industry: Centralized heating , coal gas pipe, waste gas treatment system, heat supply system.