Double-Eccentric Hard-Seated Butterfly Valves
Zhengfa describes a double-offset butterfly construction; request the actual seat arrangement rather than treating the page general material examples as one fixed build.
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The supplier describes air admission, bulk exhaust and small-orifice venting for water pipelines; final selection requires the actual line profile and transient conditions.
Describe the controlled process variable, fluid conditions, available pressure differential and control interface. Request an identified valve and drive configuration with sizing and installation information for the intended control duty. Request the current catalogue or drawing for this item, and confirm the offered configuration and supporting documents with the company before specifying an order.