--- title: "Tips on Drip: Why is Pressure So Important for Check Valve (CV) Dripline?" description: When installing dripline with a check valve (CV), the pressure is critical to ensure that the emitters open and provide the specified flow rate. image: https://ewingirrigation-20200354.hs-sites.com/hubfs/Imported_Blog_Media/PRIMG-IR-Dripline1-2.jpg --- ### Resources [![Ewing Outdoor Supply Logo V 4 Color](https://ewingirrigation-20200354.hs-sites.com/hubfs/Ewing%20Outdoor%20Supply%20Logo%20V%204%20Color.png) ](https://www.ewingoutdoorsupply.com/) [![Login/Register](https://no-cache.hubspot.com/cta/default/20200354/5d045e9a-574a-4a92-a8cc-1ce2a4352784.png)](https://cta-redirect.hubspot.com/cta/redirect/20200354/5d045e9a-574a-4a92-a8cc-1ce2a4352784) 0 You have no items in your shopping cart ### Shop Products Shop Products # Irrigation & Landscape supply Blog # Tips on Drip: Why is Pressure So Important for Check Valve (CV) Dripline? [Ewing Outdoor Supply](https://ewingirrigation-20200354.hs-sites.com/author/ewing-outdoor-supply) on January 14, 2016 Share - [**](https://twitter.com/share?source=https://ewingirrigation-20200354.hs-sites.com/tips-on-drip-why-is-pressure-so-important-for-check-valve-cv-dripline&text=Tips%20on%20Drip:%20Why%20is%20Pressure%20So%20Important%20for%20Check%20Valve%20(CV)%20Dripline?%20-%20https://ewingirrigation-20200354.hs-sites.com/tips-on-drip-why-is-pressure-so-important-for-check-valve-cv-dripline) - [** ](https://www.facebook.com/sharer/sharer.php?u=https://ewingirrigation-20200354.hs-sites.com/tips-on-drip-why-is-pressure-so-important-for-check-valve-cv-dripline&title=Tips%20on%20Drip:%20Why%20is%20Pressure%20So%20Important%20for%20Check%20Valve%20(CV)%20Dripline?&picture=https://20200354.fs1.hubspotusercontent-na1.net/hubfs/20200354/Imported_Blog_Media/PRIMG-IR-Dripline1-2.jpg&description=When%20installing%20dripline%20with%20a%20check%20valve%20(CV),%20the%20pressure%20is%20critical%20to%20ensure%20that%20the%20emitters%20open%20and%20provide%20the%20specified%20flow%20rate.) - [**](http://www.linkedin.com/shareArticle?mini=true&url=https://ewingirrigation-20200354.hs-sites.com/tips-on-drip-why-is-pressure-so-important-for-check-valve-cv-dripline&title=Tips%20on%20Drip:%20Why%20is%20Pressure%20So%20Important%20for%20Check%20Valve%20(CV)%20Dripline?&summary=When%20installing%20dripline%20with%20a%20check%20valve%20(CV),%20the%20pressure%20is%20critical%20to%20ensure%20that%20the%20emitters%20open%20and%20provide%20the%20specified%20flow%20rate.) - [**](https://ewingirrigation-20200354.hs-sites.com/tips-on-drip-why-is-pressure-so-important-for-check-valve-cv-dripline) ![](https://ewingirrigation-20200354.hs-sites.com/hubfs/Imported_Blog_Media/PRIMG-IR-Dripline1-2.jpg) When installing **dripline with a check valve (CV)**, the pressure is critical to ensure that the emitters open and provide the specified flow rate. [Landscape Products EZ-ID CV](https://www.ewingirrigation.com/catalogsearch/result/?q=EZ-ID+with+Check+Valve) requires a minimum opening pressure of 12.0 psi at the emitter. Other CV dripline emitters require higher opening pressures—[Techline CV](https://www.ewingirrigation.com/catalogsearch/result/?q=Techline) is 14.5 psi and [Rain Bird XFCV](https://www.ewingirrigation.com/catalogsearch/result/?q=XFCV) is 20 psi. **Pressure-compensating (PC) dripline **(without check valves) is a little more forgiving, as it has a lower opening pressure and will emit water at lower pressures. Contractors must be aware of this when adding or replacing dripline with a check valve on an existing pressure-compensated installation. [![](https://ewingirrigation-20200354.hs-sites.com/hs-fs/hubfs/Imported_Blog_Media/PRIMG-Misc-CV-Drip-Tips-Charts-1.jpg?width=475&height=436&name=PRIMG-Misc-CV-Drip-Tips-Charts-1.jpg)](https://ewingirrigation-20200354.hs-sites.com/hubfs/Imported_Blog_Media/PRIMG-Misc-CV-Drip-Tips-Charts-1.jpg) As with sprinklers and rotary heads, two factors come into play with dripline installations: the available flow and the outlet pressure from the drip control zone kit. Let’s use an example of 12 gpm available and a 25 psi control zone kit. If we use 0.6 gph dripline with 12 inch emitter spacing, we can only install a maximum 1,200 feet of dripline with no single run greater than 255 feet. A great rule of thumb for dripline installation challenges is to ask, **“****How would I do this if I were installing sprinklers?”** The hydraulic solutions are the same. Learn more about how the check valve on the [EZ-ID CV dripline](https://www.ewingirrigation.com/downloads/dl/file/id/681/ez_id_cv_product_description_brochure.pdf) can help conserve water and protect against debris in the dripline. 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