Product Announcement from Check-All Valve Mfg. Co.
The Check-All Flanged & Drilled - PTFE Lined check valve is a one-piece body valve with ANSI flanged ends. The valve has a solid one-piece PTFE Liner, which covers the flange faces, out to the raised face diameter. All wetted surfaces are virgin PTFE including the PTFE Encapsulated stainless steel spring.
HT bodies are made of Carbon Steel only. The liner is made of virgin PTFE. It is installed as one solid piece of PTFE and the internal geometrical shape is machined. The PTFE liner has a minimum wall thickness of 3/32 inch which guarantees against pin holes which can be present is fused liners.