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Custom Ball Valve Seats



Carbon-graphite ball valve seats manufactured by Metallized Carbon Corporation are used in valves and designed to handle hot liquids or hot gases. The temperature range for Metcar carbon-graphite ball valve seats is from approximately 350°F, (where plastic seats can not be used because they start to soften), to over 800°F in oxidizing environments, (where high temperature carbon-graphite materials start to oxidize). Metcar carbon-graphite seats are also used for “fire safe” ball valves in the petroleum industry. These valves must operate freely after a simulated fire test where the valve is heated to 1400-1800°F for at least thirty minutes.

Because of its high degree of chemical compatibility carbon-graphite ball valve seats are utilized by many manufacturers in the most severe chemical environments.

The ball valve seats are produced by shrink fitting a carbon-graphite ring into a metal retaining ring. After shrink-fitting, the carbon-graphite is pre-stressed in compression and exhibits the same coefficient of thermal expansion as the metal retaining ring. The concave face of the carbon graphite ring is polished to make a pressure tight fit with the ball, and the back face of the carbon-graphite is lapped flat to make a pressure tight fit with the valve housing.

Metcar’s technical staff can recommend the appropriate material for your application.






Specifications

Material

Over 150 grades of our proprietary carbon/graphite METCAR material are available. Our engineers will select the optimum grade based on application, environment, temperature, etc.

Retaining Ring Material

Carpenter Alloys
Hasteloy

Inconel

Stainless Steels

Steel

Titanium

Temperature Rating 2

350 to 800°F (in oxidizing environments) ºF


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Metcar Physical Properties
(PDF, 447KB)


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