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May 1, 2021 | By Mary Page Bailey and Gerald Ondrey
This company’s range of butterfly valves (photo) are offered with a highly polished 316 stainless-steel housing and disc, which make the valve suitable for many applications in the food, chemical and pharmaceutical industries. The inflatable seat design of the butterfly valve provides an improved seal by utilizing air pressure to expand the seat against the disc, providing more sealing area and an even pressure distribution against the disc every time it closes. The seat automatically compensates for wear when it inflates against the disc, extending valve life considerably. Because the valve’s disc only makes casual contact with the seat during opening and closing, torque requirements are substantially lower that those experienced with other butterfly-valve configurations. This ease of movement also allows the disc to come to a precise 90-deg position every time it opens. Additionally, the smooth profile of the disc eases material flow and reduces buildup. These stainless-steel butterfly valves are available in sizes ranging from 2 to 20 in. — Posi-flate, St. Paul, Minn.
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