--- title: Automatic Flow Control Valves vs. Manual Control Valves description: Without the proper flow control valves, system pressures in an HVAC system fluctuate and deviate from the original system design.   image: https://info.hoffman-hoffman.com/hubfs/Untitled%20design%20(50).png --- - [(336) 292-8777](tel:+3362928777) - [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) [Blog](https://blog.hoffman-hoffman.com/blog) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-icon-svg.svg)](https://www.facebook.com/HoffmanHoffmanInc) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-icon-svg.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-icon-svg.svg)](https://twitter.com/HoffandHoffInc) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-icon-svg.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) [![cropped-hoffman-logo](https://info.hoffman-hoffman.com/hs-fs/hubfs/Blog-Assets-April-2020/Images/cropped-hoffman-logo.png?width=1457&height=281&name=cropped-hoffman-logo.png "cropped-hoffman-logo")](http://hoffman-hoffman.com) - [Equipment](https://www.hoffman-hoffman.com/equipment/) - [In-Stock Catalog with Prices](https://issuu.com/hoffman-hoffman/docs/hh_2019_single_print?e=2500206/65071024) - [Projects](https://www.hoffman-hoffman.com/project-types/) - [Commercial Office Buildings](https://www.hoffman-hoffman.com/project-types/commercial-office-buildings/) - [Data Centers](https://www.hoffman-hoffman.com/project-types/data-centers/) - [Hospitality](https://www.hoffman-hoffman.com/project-types/hospitality/) - [Hospitals & Medical Offices](https://www.hoffman-hoffman.com/project-types/hospitals-medical-offices/) - [Automation](https://www.hoffman-hoffman.com/automation/) - [Services](https://www.hoffman-hoffman.com/services/) - [Training](https://www.hoffman-hoffman.com/training/) - [Parts](https://www.hoffman-hoffman.com/parts/) - [About Us](https://www.hoffman-hoffman.com/the-hoffman-way/) - [History](https://www.hoffman-hoffman.com/the-hoffman-way/history/) - [Work With Us](https://www.hoffman-hoffman.com/the-hoffman-way/work-with-us/) - [Contact Us](https://www.hoffman-hoffman.com/the-hoffman-way/contact/) - [Privacy Policy](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Privacy-Policy-FINAL-2020.04.07-.pdf) - [Terms of Use](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Hoffman-Website-Terms-of-Use-FINAL-2020.04.07-.pdf) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search.svg) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search-white.svg) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/marker-white.svg) #### Main Office 3816 Patterson St Greensboro, NC 27407 23 #### Hours of Operation 8AM to 5PM - Monday - Friday Closed Saturday and Sunday *We offer 24/7 emergency repair service* ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Stock Warehouse [(800) 334-0254](tel:+8003340254) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Replacement Parts [(800) 332-2295](tel:8003322295) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Consultation / Evaluation: [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) ![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Parts: [parts@hoffman-hoffman.com](mailto:parts@hoffman-hoffman.com) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-white.svg)](https://www.facebook.com/HoffmanHoffmanInc/) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-white.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-white.svg)](https://twitter.com/HoffandHoffInc) [![](https://info.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-white.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) [![cropped-hoffman-logo](https://info.hoffman-hoffman.com/hs-fs/hubfs/Blog-Assets-April-2020/Images/cropped-hoffman-logo.png?width=1457&height=281&name=cropped-hoffman-logo.png "cropped-hoffman-logo")](http://hoffman-hoffman.com) - [Equipment](https://www.hoffman-hoffman.com/equipment/) - [In-Stock Catalog with Prices](https://issuu.com/hoffman-hoffman/docs/hh_2019_single_print?e=2500206/65071024) - [Projects](https://www.hoffman-hoffman.com/project-types/) - [Commercial Office Buildings](https://www.hoffman-hoffman.com/project-types/commercial-office-buildings/) - [Data Centers](https://www.hoffman-hoffman.com/project-types/data-centers/) - [Hospitality](https://www.hoffman-hoffman.com/project-types/hospitality/) - [Hospitals & Medical Offices](https://www.hoffman-hoffman.com/project-types/hospitals-medical-offices/) - [Automation](https://www.hoffman-hoffman.com/automation/) - [Services](https://www.hoffman-hoffman.com/services/) - [Training](https://www.hoffman-hoffman.com/training/) - [Parts](https://www.hoffman-hoffman.com/parts/) - [About Us](https://www.hoffman-hoffman.com/the-hoffman-way/) - [History](https://www.hoffman-hoffman.com/the-hoffman-way/history/) - [Work With Us](https://www.hoffman-hoffman.com/the-hoffman-way/work-with-us/) - [Contact Us](https://www.hoffman-hoffman.com/the-hoffman-way/contact/) - [Privacy Policy](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Privacy-Policy-FINAL-2020.04.07-.pdf) - [Terms of Use](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Hoffman-Website-Terms-of-Use-FINAL-2020.04.07-.pdf) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search.svg) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search-white.svg) [![mob-logo](https://info.hoffman-hoffman.com/hs-fs/hubfs/Blog-Assets-April-2020/Images/mob-logo.png?width=201&height=201&name=mob-logo.png "mob-logo")](http://hoffman-hoffman.com) - [Equipment](https://www.hoffman-hoffman.com/equipment/) - [In-Stock Catalog with Prices](https://issuu.com/hoffman-hoffman/docs/hh_2019_single_print?e=2500206/65071024) - [Projects](https://www.hoffman-hoffman.com/project-types/) - [Commercial Office Buildings](https://www.hoffman-hoffman.com/project-types/commercial-office-buildings/) - [Data Centers](https://www.hoffman-hoffman.com/project-types/data-centers/) - [Hospitality](https://www.hoffman-hoffman.com/project-types/hospitality/) - [Hospitals & Medical Offices](https://www.hoffman-hoffman.com/project-types/hospitals-medical-offices/) - [Automation](https://www.hoffman-hoffman.com/automation/) - [Services](https://www.hoffman-hoffman.com/services/) - [Training](https://www.hoffman-hoffman.com/training/) - [Parts](https://www.hoffman-hoffman.com/parts/) - [About Us](https://www.hoffman-hoffman.com/the-hoffman-way/) - [History](https://www.hoffman-hoffman.com/the-hoffman-way/history/) - [Work With Us](https://www.hoffman-hoffman.com/the-hoffman-way/work-with-us/) - [Contact Us](https://www.hoffman-hoffman.com/the-hoffman-way/contact/) - [Privacy Policy](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Privacy-Policy-FINAL-2020.04.07-.pdf) - [Terms of Use](https://www.hoffman-hoffman.com/wp-content/uploads/2020/04/Hoffman-Website-Terms-of-Use-FINAL-2020.04.07-.pdf) ![](https://www.hoffman-hoffman.com/wp-content/themes/manedigital/assets/dist/images/search.svg) ## WE BUILD THE FUTURE #### recent posts ![](https://info.hoffman-hoffman.com/hubfs/down-arrow.png) - [Maximizing Efficiency and Comfort: The Price Ultrasuite for Hospital Operating Rooms](https://info.hoffman-hoffman.com/blog/maximizing-efficiency-and-comfort-the-price-ultrasuite-for-hospital-operating-rooms) - [Dehumidification: Ensuring Optimal Conditions in Critical Environments](https://info.hoffman-hoffman.com/blog/dehumidification-ensuring-optimal-conditions-in-critical-environments) - [Bridging the Gap: Celebrating Sales Engineers During Engineers Week](https://info.hoffman-hoffman.com/blog/bridging-the-gap-celebrating-sales-engineers-during-engineers-week) - [For the Love of HVAC: A Career Story](https://info.hoffman-hoffman.com/blog/for-the-love-of-hvac-a-career-story) - [MERV-A Ratings Make the Best Filters Stand Out from the Crowd](https://info.hoffman-hoffman.com/blog/merv-a-ratings-make-the-best-filters-stand-out-from-the-crowd) #### popular ![](https://info.hoffman-hoffman.com/hubfs/down-arrow.png) - [ABB ACH580 Drives: Override Mode](https://info.hoffman-hoffman.com/blog/abb-ach580-drives-override-mode) - [Understanding HVAC Load Calculations for Commercial Spaces](https://info.hoffman-hoffman.com/blog/understanding-hvac-load-calculations-for-commercial-spaces) - [High Stakes, High Comfort: The HVAC Demands of Casinos](https://info.hoffman-hoffman.com/blog/high-stakes-high-comfort-the-hvac-demands-of-casinos) - [Psychrometrics – The Essence of HVAC](https://info.hoffman-hoffman.com/blog/psychrometrics-the-essence-of-hvac) - [HVAC Products for Magnetic Resonance Imaging (MRI) Applications](https://info.hoffman-hoffman.com/blog/hvac-products-for-magnetic-resonance-imaging-mri-applications) #### tags ![](https://info.hoffman-hoffman.com/hubfs/down-arrow.png) - [Commercial HVAC](https://info.hoffman-hoffman.com/blog/tag/commercial-hvac) - [indoor air quality](https://info.hoffman-hoffman.com/blog/tag/indoor-air-quality) - [HVAC](https://info.hoffman-hoffman.com/blog/tag/hvac) - [Price Industries](https://info.hoffman-hoffman.com/blog/tag/price-industries) - [Greenheck](https://info.hoffman-hoffman.com/blog/tag/greenheck) - [Ventilation](https://info.hoffman-hoffman.com/blog/tag/ventilation) - [Careers](https://info.hoffman-hoffman.com/blog/tag/careers) - [energy efficiency](https://info.hoffman-hoffman.com/blog/tag/energy-efficiency) - [HVAC expertise](https://info.hoffman-hoffman.com/blog/tag/hvac-expertise) - [commercial hvac system](https://info.hoffman-hoffman.com/blog/tag/commercial-hvac-system) - [healthy air](https://info.hoffman-hoffman.com/blog/tag/healthy-air) - [air circulation](https://info.hoffman-hoffman.com/blog/tag/air-circulation) - [k-12 schools](https://info.hoffman-hoffman.com/blog/tag/k-12-schools) - [ASHRAE](https://info.hoffman-hoffman.com/blog/tag/ashrae) - [ESOP](https://info.hoffman-hoffman.com/blog/tag/esop) - [Global Plasma Solutions](https://info.hoffman-hoffman.com/blog/tag/global-plasma-solutions) - [air quality](https://info.hoffman-hoffman.com/blog/tag/air-quality) - [hospitals](https://info.hoffman-hoffman.com/blog/tag/hospitals) - [Ruskin](https://info.hoffman-hoffman.com/blog/tag/ruskin) - [ABB](https://info.hoffman-hoffman.com/blog/tag/abb) - [Building](https://info.hoffman-hoffman.com/blog/tag/building) - [Camfil](https://info.hoffman-hoffman.com/blog/tag/camfil) - [filtration](https://info.hoffman-hoffman.com/blog/tag/filtration) - [Air Purification](https://info.hoffman-hoffman.com/blog/tag/air-purification) - [Big Ass Fans](https://info.hoffman-hoffman.com/blog/tag/big-ass-fans) - [Daikin Applied](https://info.hoffman-hoffman.com/blog/tag/daikin-applied) - [Louvers](https://info.hoffman-hoffman.com/blog/tag/louvers) - [NPBI](https://info.hoffman-hoffman.com/blog/tag/npbi) - [Needlepoint Bipolar Ionization](https://info.hoffman-hoffman.com/blog/tag/needlepoint-bipolar-ionization) - [air handler](https://info.hoffman-hoffman.com/blog/tag/air-handler) - [comfort](https://info.hoffman-hoffman.com/blog/tag/comfort) - [Continuing Education](https://info.hoffman-hoffman.com/blog/tag/continuing-education) - [Dampers](https://info.hoffman-hoffman.com/blog/tag/dampers) - [Ductwork](https://info.hoffman-hoffman.com/blog/tag/ductwork) - [HVLS Fans](https://info.hoffman-hoffman.com/blog/tag/hvls-fans) - [air pollution](https://info.hoffman-hoffman.com/blog/tag/air-pollution) - [energy recovery](https://info.hoffman-hoffman.com/blog/tag/energy-recovery) - [engineer tools](https://info.hoffman-hoffman.com/blog/tag/engineer-tools) - [training](https://info.hoffman-hoffman.com/blog/tag/training) - [universities](https://info.hoffman-hoffman.com/blog/tag/universities) - [Building Safety](https://info.hoffman-hoffman.com/blog/tag/building-safety) - [Daikin](https://info.hoffman-hoffman.com/blog/tag/daikin) - [DuctSox](https://info.hoffman-hoffman.com/blog/tag/ductsox) - [PDH Credits](https://info.hoffman-hoffman.com/blog/tag/pdh-credits) - [Sustainability](https://info.hoffman-hoffman.com/blog/tag/sustainability) - [VFDs](https://info.hoffman-hoffman.com/blog/tag/vfds) - [Webinar](https://info.hoffman-hoffman.com/blog/tag/webinar) - [airborne illnesses](https://info.hoffman-hoffman.com/blog/tag/airborne-illnesses) - [engineer](https://info.hoffman-hoffman.com/blog/tag/engineer) - [volume control](https://info.hoffman-hoffman.com/blog/tag/volume-control) - [Evapco](https://info.hoffman-hoffman.com/blog/tag/evapco) - [Nortek](https://info.hoffman-hoffman.com/blog/tag/nortek) - [Safety](https://info.hoffman-hoffman.com/blog/tag/safety) - [Stationary Louvers](https://info.hoffman-hoffman.com/blog/tag/stationary-louvers) - [energysolutions](https://info.hoffman-hoffman.com/blog/tag/energysolutions) - [facilities management](https://info.hoffman-hoffman.com/blog/tag/facilities-management) - [molecular filters](https://info.hoffman-hoffman.com/blog/tag/molecular-filters) - [pressurized room](https://info.hoffman-hoffman.com/blog/tag/pressurized-room) - [AHU](https://info.hoffman-hoffman.com/blog/tag/ahu) - [Architectural Design](https://info.hoffman-hoffman.com/blog/tag/architectural-design) - [Architectural Solutions](https://info.hoffman-hoffman.com/blog/tag/architectural-solutions) - [Automatic Balancing Dampers](https://info.hoffman-hoffman.com/blog/tag/automatic-balancing-dampers) - [Baldor Motors](https://info.hoffman-hoffman.com/blog/tag/baldor-motors) - [COVID-19](https://info.hoffman-hoffman.com/blog/tag/covid-19) - [CamCarb](https://info.hoffman-hoffman.com/blog/tag/camcarb) - [Controls](https://info.hoffman-hoffman.com/blog/tag/controls) - [Custom HVAC](https://info.hoffman-hoffman.com/blog/tag/custom-hvac) - [DOAS](https://info.hoffman-hoffman.com/blog/tag/doas) - [Data Centers](https://info.hoffman-hoffman.com/blog/tag/data-centers) - [Dedicated Outdoor Air System](https://info.hoffman-hoffman.com/blog/tag/dedicated-outdoor-air-system) - [Dehumidification](https://info.hoffman-hoffman.com/blog/tag/dehumidification) - [Haakon](https://info.hoffman-hoffman.com/blog/tag/haakon) - [Heat Pump](https://info.hoffman-hoffman.com/blog/tag/heat-pump) - [Make-up Air](https://info.hoffman-hoffman.com/blog/tag/make-up-air) - [Munters](https://info.hoffman-hoffman.com/blog/tag/munters) - [Remote Assistance](https://info.hoffman-hoffman.com/blog/tag/remote-assistance) - [Remote Monitoring](https://info.hoffman-hoffman.com/blog/tag/remote-monitoring) - [Revit Tool](https://info.hoffman-hoffman.com/blog/tag/revit-tool) - [Technicians](https://info.hoffman-hoffman.com/blog/tag/technicians) - [UL certified](https://info.hoffman-hoffman.com/blog/tag/ul-certified) - [Water Treatment Systems](https://info.hoffman-hoffman.com/blog/tag/water-treatment-systems) - [Zoning](https://info.hoffman-hoffman.com/blog/tag/zoning) - [ceiling exhaust fan](https://info.hoffman-hoffman.com/blog/tag/ceiling-exhaust-fan) - [chillers](https://info.hoffman-hoffman.com/blog/tag/chillers) - [cooling towers](https://info.hoffman-hoffman.com/blog/tag/cooling-towers) - [designer](https://info.hoffman-hoffman.com/blog/tag/designer) - [drives](https://info.hoffman-hoffman.com/blog/tag/drives) - [eCAPS](https://info.hoffman-hoffman.com/blog/tag/ecaps) - [environmentally friendly](https://info.hoffman-hoffman.com/blog/tag/environmentally-friendly) - [essence](https://info.hoffman-hoffman.com/blog/tag/essence) - [evaporative cooling equipment](https://info.hoffman-hoffman.com/blog/tag/evaporative-cooling-equipment) - [project profile](https://info.hoffman-hoffman.com/blog/tag/project-profile) - [refrigerant](https://info.hoffman-hoffman.com/blog/tag/refrigerant) - [rooftop systems](https://info.hoffman-hoffman.com/blog/tag/rooftop-systems) - [uvdi systems](https://info.hoffman-hoffman.com/blog/tag/uvdi-systems) - [venmar](https://info.hoffman-hoffman.com/blog/tag/venmar) - [ventilators](https://info.hoffman-hoffman.com/blog/tag/ventilators) # Automatic Flow Control Valves vs. Manual Control Valves ![](https://info.hoffman-hoffman.com/hubfs/calender-icon-black.png) January 24, 2022 ![](https://info.hoffman-hoffman.com/hubfs/Untitled%20design%20(50).png) **What Are Flow Control Valves?**  Flow control valves are used in commercial hydronic heating systems to limit the flow of water to equipment. In its simplest form, a flow control valve consists of an aperture that is adjusted manually – opening to increase flow, closing to decrease it. More complex valves can be configured so that optimized orifices automatically limit the fluid flow either pressure-dependently or pressure-independently. More complex valves can be configured so that optimized orifices automatically limit the fluid flow either pressure-dependently or pressure-independently.   **Why Are Flow Control Valves Needed?**  When installing an HVAC system, it is necessary to measure the exact amount of constant flow required to size pumps, piping, and accessories properly. [Without the proper flow control valves, system pressures ](http://www.haysfluidcontrols.com/blog/flow-control-valves-everything-need-know/)[fluctuate and deviate from the original system design](http://www.haysfluidcontrols.com/blog/flow-control-valves-everything-need-know/).   A hydronic system needs to be balanced to ensure an even distribution of flow throughout the system. Without hydronic system balancing, some coils have too much flow, and other coils don't have enough; the system is unbalanced. An unbalanced heating or cooling system results in excessive complaints from occupants because they are either too cold or too hot.   A good control valve, [like those offered by our manufacturing partner Hays Fluid Controls](http://flowcontrolvalves.haysfluidcontrols.com/), will not only be effective, but will also eliminate vibration, noise, feedback, and oscillation,  with a design that ensures they won’t clog and can be backflushed.   **Cost-Effectiveness**   Engineers tend to concentrate on choosing the most energy-efficient boilers, chillers, and terminal units, but sometimes fail to consider the fact that their efficiencies and heat transfer capabilities are compromised without proper flow control.  Most engineers opt for manual balance valves because their initial cost is less than automatic valves; however, they may fail to factor in the total cost of maintaining a manual valve system. When the system pressure changes, automatic valves maintain the design flow, whereas manual valves experience fluctuations in flow as the pressure increases or decreases. When considering ongoing system maintenance, it is far more cost-effective to verify the flow of an automatic valve than to manually balance a system using manual valves.   It has been estimated by our manufacturer, [Griswold Controls](https://griswoldcontrols.com/), that the [contractor price to maintain a manual valve system could be up to $27 higher than that of an automatic valve system](https://griswoldcontrols.com/manual-valves-vs-automatic-flow-limiting-valves/).  Total Valves Needed  A system using automatic flow limiting or pressure independent (PI) valves requires fewer balancing valves than one with a manual balance. Figure 1 ([credit: Griswold Controls](https://griswoldcontrols.com/manual-valves-vs-automatic-flow-limiting-valves/)) shows a schematic of a system serving 18 heat transfer (heating or cooling) coils.  ![manual-vs-automatic-diagram-1](https://info.hoffman-hoffman.com/hs-fs/hubfs/manual-vs-automatic-diagram-1.jpg?width=654&name=manual-vs-automatic-diagram-1.jpg)  The manual system, shown above, requires a total of 27 valves whereas the automatic system, on the right, requires only 18 because it does not require the “partner balancing valves” (shown in red) on the risers and the branches.   Using an example contractor price of $35 for a 3/4" manual balance valve and $60 for a 3/4" automatic valve, the initial cost of 27 manual valves would be $945, while the initial cost of 18 automatic valves would be $1,080. However, once labor to balance the valves has been factored in, the cost of the manually balanced system could reach $2,633, whereas the price of the automatically balanced system would only be $1,260.   ##### // about the author ![Laiken Kuykendall](https://info.hoffman-hoffman.com/hubfs/Laikenheadshot.jpg) ### ![](https://info.hoffman-hoffman.com/hubfs/user.png) [Laiken Kuykendall](https://info.hoffman-hoffman.com/blog/author/laiken-kuykendall) Laiken is the Digital Marketing Specialist for the Hoffman Family of Companies. She learns more about the commercial/industrial HVAC industry each day and enjoys sharing her best findings here! ##### // share this post - - - - [mailto:?body=https://info.hoffman-hoffman.com/blog/automatic-flow-control-valves-vs.-manual-control-valves](mailto:?body=https://info.hoffman-hoffman.com/blog/automatic-flow-control-valves-vs.-manual-control-valves) - ### Recent Posts ### categories - [ABB (6)](https://info.hoffman-hoffman.com/blog/tag/abb) - [AHU (1)](https://info.hoffman-hoffman.com/blog/tag/ahu) - [air circulation (9)](https://info.hoffman-hoffman.com/blog/tag/air-circulation) - [air handler (5)](https://info.hoffman-hoffman.com/blog/tag/air-handler) - [air pollution (4)](https://info.hoffman-hoffman.com/blog/tag/air-pollution) - [Air Purification (5)](https://info.hoffman-hoffman.com/blog/tag/air-purification) - [air quality (8)](https://info.hoffman-hoffman.com/blog/tag/air-quality) - [airborne illnesses (3)](https://info.hoffman-hoffman.com/blog/tag/airborne-illnesses) - [Architectural Design (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-design) - [Architectural Solutions (1)](https://info.hoffman-hoffman.com/blog/tag/architectural-solutions) - [ASHRAE (8)](https://info.hoffman-hoffman.com/blog/tag/ashrae) - [Automatic Balancing Dampers (1)](https://info.hoffman-hoffman.com/blog/tag/automatic-balancing-dampers) - [Baldor Motors (1)](https://info.hoffman-hoffman.com/blog/tag/baldor-motors) - [Big Ass Fans (5)](https://info.hoffman-hoffman.com/blog/tag/big-ass-fans) - [Building (6)](https://info.hoffman-hoffman.com/blog/tag/building) ### subscribe #### Our Location Main Office 3816 Patterson St Greensboro, NC 27407 #### Hours of Operation 8AM to 5PM – Monday through Friday Closed Saturday and Sunday *We offer 24/7 emergency repair service* #### Contact Us ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Main Office [(336) 292-8777](tel:+3362928777) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Stock Warehouse [(800) 334-0254](tel:+8003340254) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/telephone-white.svg) Replacement Parts [(800) 332-2295](tel:+8003322295) ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/email-white.svg) Consultation / Evaluation: [info@hoffman-hoffman.com](mailto:info@hoffman-hoffman.com) Hoffman & Hoffman, Inc., Hoffman Building Technologies, Inc., Hoffman Mechanical Solutions, Inc., and Heat Transfer Sales, LLC, are separate legal entities. ![](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/footer-logo.png) All content © 2019, Hoffman & Hoffman [![Facebook](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/facebook-white.svg)](https://www.facebook.com/HoffmanHoffmanInc) [![Instagram](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/instagram-white.svg)](https://www.instagram.com/hoffmanhoffmaninc/) [![Twitter](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/twitter-white.svg)](https://twitter.com/HoffandHoffInc) [![LinkedIn](https://blog.hoffman-hoffman.com/hubfs/Blog-Assets-April-2020/Images/linkedin-white.svg)](https://www.linkedin.com/company/hoffman-%26-hoffman-inc./) ```json { "@context" : "https://schema.org", "@type" : "BlogPosting", "author" : { "@type" : "Person", "name" : "Laiken Kuykendall", "url" : "https://info.hoffman-hoffman.com/blog/author/laiken-kuykendall" }, "dateModified" : "2022-01-24T21:39:26.661Z", "datePublished" : "2022-01-24T21:39:26.000Z", "headline" : "Automatic Flow Control Valves vs. Manual Control Valves", "image" : [ "https://info.hoffman-hoffman.com/hubfs/Untitled%20design%20(50).png" ], "mainEntityOfPage" : { "@id" : "https://info.hoffman-hoffman.com/blog/automatic-flow-control-valves-vs.-manual-control-valves", "@type" : "WebPage" }, "publisher" : { "@type" : "Organization", "logo" : { "@type" : "ImageObject", "url" : "https://info.hoffman-hoffman.com/hubfs/HH_Logo_RGB.png" }, "name" : "Hoffman & Hoffman, Inc." } } ```