The non-offset valves are the low end of the spectrum. They are generally "rubber" lined. Typically capable of API Cast Steel Valvessealing to 150 psi, temp-limited by the elastomer of the seats, and the Forged Steel Valvesshaft seals by interference fit between the shaft and liner. These can work on dry granular solids, or with a>Needle Valves polished vane and pedigreed liner they are used on food-or pharmaceutical applications. As theFilter valve opens and closes, some part of the vane is always wiping the seat, causing friction and wear. TheseBellow Seal Valve valves are position-seated, When the vane is at 90-degrees to the pipe centerline, they are as closed as they get.

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