| 摘要 |
A double check valve backflow prevention apparatus of lightweight modular construction. The apparatus comprises a primary housing component having a flangeless lateral opening, a first check valve module which fits within the lateral opening a second check valve module which also fits within the lateral opening a central housing component, with the central housing fitting within the lateral opening between the first check valve module and second check valve module. A first fluid tight seal is positioned between the first check valve module and central housing component, and a second fluid tight seal is positioned between the second check valve module and central housing component. A third fluid tight seal is positioned between the first check valve module and the primary housing component, and a fourth fluid tight seal is positioned between the second check valve module and the primary housing component. The primary housing component, first and second check valve modules and central housing component define a complete, fluid-tight valve body or assembly.
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