Valve Seat Material Guide

The most challenging decision when selecting a Ball Valve is choosing the right Seat Material

Seat Code Material Description Colour
595 Reinforced PTFE (RPTFE) 15% glass reinforced PTFE, suitable for temperature -50°F to 450°F, chemical resistance is compatible to virgin PTFE with better wear factor. Chalky White
578 Virgin TFE (PTFE) Made from Virgin Teflon, this is the most common valve seating material; its chemical compatibility is excellent for almost all media. Temperature -50°F to 450°F. White
541 TFM TFM 1600 is a modified PTFE which has a significantly lower melt viscosity giving better particle fusion during sintering, resulting in smoother surfaces and exceptional chemical and heat resistance properties. Features reduced cold flow, lower porosity and permeabiltiy and lower void content. Advantages are smoother surfaces, reduced deformation under load, and increased design flexibity -328F to 500F. White
53G 50-50 Stainless Filled PTFE Stainless Steel PFTE. Combines the strength of metal with the lubricity of PFTE. Offers the abrasion resistance of metal, with higher temperature and pressure ratings than RPTFE – 20F to 500F Grey
855 UMHW Polyethylene UHMW polyethylene is used for highly radio active materials where TFE in not acceptable. These seats also meet the needs of the tobacco industry wherever TFE is prohibited. It is especially well suited for handling highly abrasive media. Temperature -57C – 93C. Not suitable for steam. Semi-translucent White
C/F Metal (Stellite) Stellite is a very hard alloy of cobalt and chromium and is known for its hardness, wear and corrosion resistance. It may also contain tungsten or molybdenum and a small but important amount of carbon.

Metallic
53H PEEK PEEK is the performance material of choice for aggressive environments such as high temperatures, wet processes, and heavy loads. It combines exceptional wear, chemical and moisture resistance with very high strength, dimensional stability and stiffness. PEEK can be continuously exposed to hot water or steam with no distortion, corrosion or galling. Comminly used in the Pharmaceutical processing and packaging, Aircraft, Semiconductor and Food and dairy processing industries. Temperature -70°F to 550°F. Black
C/F Cavity Filler (PTFE) Designed to reduce the possibilit yof contomination by the entrapment of process fluids in the void commonly found behind the ball and the valve body. 25% Carbon Graphite with 75% PTFE, this material offers a wide temperature range with better wear resistance than standard RPTFE. Commonly used for processes invlolving paints or dyes. Temperature -50°F to 450°F. White

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