Double Check Valve Diagram
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![Installing a backflow prevention device](https://i2.wp.com/pw-cdn.watercorporation.com.au/-/media/WaterCorp/Image-Gallery/Page-Images/Developing-and-Building/TEMP-Developers-and-builders/double-check-valve.png?rev=8337863117004a8593983c5c39cf2b69&hash=8E6D2AC0A884E8FC806AD8F4A17FE9A6)
![Flow direction of Valve – Part 1 ( check valve ) – AMARINE](https://i2.wp.com/amarineblog.files.wordpress.com/2017/09/val-4.png)
![Figure 18-9. Double check valve-exploded view.](https://i2.wp.com/constructioncranes.tpub.com/TM-5-3810-295-34/TM-5-3810-295-340346im.jpg)
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![Double check valve relief assembly used throughout the purification](https://i2.wp.com/www.researchgate.net/profile/Oleg_Li/publication/321604301/figure/download/fig3/AS:613967730847745@1523392722219/Double-check-valve-relief-assembly-used-throughout-the-purification-system-A-check-valve.png)
![Patent US20040134537 - Double check valve assembly - Google Patenten](https://i2.wp.com/patentimages.storage.googleapis.com/US20040134537A1/US20040134537A1-20040715-D00003.png)