{"id":19010,"date":"2026-10-23T14:59:13","date_gmt":"2026-10-23T14:59:13","guid":{"rendered":"https:\/\/oudianvalve.com\/?p=19010"},"modified":"2026-10-23T14:59:13","modified_gmt":"2026-10-23T14:59:13","slug":"double-check-valve-operation-and-principles","status":"publish","type":"post","link":"https:\/\/oudianvalve.com\/pt\/2026\/10\/double-check-valve-operation-and-principles\/","title":{"rendered":"Double Check Valve Operation and Principles"},"content":{"rendered":"
A double check valve is a specialized mechanical backflow prevention device designed to protect potable water supplies from contamination caused by reverse flow. Consisting of two independently acting, spring-loaded internal check valves<\/a> placed in series within a single body, this assembly prevents fluid from traveling backward during backpressure or backsiphonage events. Plumbing codes throughout the United States recognize this configuration as an effective safeguard for low-hazard cross-connections where potential contaminants alter the aesthetic quality of drinking water without endangering human health.<\/p>\n

Determining whether this specific assembly suits a plumbing installation requires evaluating the degree of hazard, local regulatory approvals, and the physical characteristics of the connected system. Differences in working pressure, continuous fluid exposure, and accessibility for routine inspection govern the selection between this arrangement and alternative backflow assemblies.<\/p>\n

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