Spares Kit For Unitech FA Split-Body PTFE Butterfly Valve

Back-up rings are used in conjunction with O-Ring for both static and dynamic sealing applications. The design of PTFE Back-up rings it used to overcome the problems of O-ring extrusion when the system pressures are greater than the sealing capabilities of an unsupported O-ring. The use of P.T.F.E. for anti-extrusion rings has many advantages over ‘hard rubber’ materials, particularly at system pressures.