The ZGV Full Body Lined Plug Valves use high precision investment casting method for all major pressure holding components. The standard base model offers:

» Carbon or Stainless Steel body, plug and cover (ASTM A216 Gr. WCB, A351 CF8 or CF8M).
» Low porosity PFA (Perfluoroalkoxy) as standard liner
» All cast parts have an acrylic based coating prior to lining for added protection from corrosion attack due to permeation
» ZGV Lined Plug Valves feature an unpigmented virgin PFA lining applied by Transfer Molding and locked into castings by machined dovetail-shaped grooves, and cast dovetail-shaped recesses in body castings and cast holes.

» Prevents liner collapse in vacuum conditions
» Prevents blow out in high temperature and pressure combined conditions
» Transfer Molding insures equal distribution and consistency of liner throughout the entire surface of the lined components as per ASTM F1545
» No weak sections in the valve liner
» All liner defects are directly visible
» By design, Lined Plug Valves are cavity-free both in open and closed positions.
» No particle accumulation
» Ideal for corrosive slurry applications superior sealing capabilities

The interface between the tapered outer plug and the tapered inner body liner provides a 360° primary sealing area. Additional sealing levels are achieved by a delta ring and PTFE diaphragm, both protected by a metal diaphragm. The metal diaphragm assists in encapsulation, acts as an antistatic device, and is a metal seal to atmosphere, in case of PTFE failure.

» Tight shutoff
» Compression seal (upstream and downstream)
» Bi-directional valve
» Sealed at both plug and stem