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Contamination Happens—But Not All Valves Handle It the Same Contamination is an unavoidable part of any mechanical system. In HVAC applications especially, fine particles are almost always present. Even with strainers in place, these tiny contaminants can pass through and pose a threat to sensitive components—particularly flow control valves. For most valves on the market, that’s a problem. Small debris can interfere with internal mechanisms, leading to clogging, jamming, and inconsistent flow. But the Hays Mesurflo® is designed differently. Thanks to its unique, no-sliding-parts construction, the Mesurflo® resists the kinds of failures that often plague traditional valves. Instead of seizing up under stress, it keeps working—delivering consistent, reliable performance even in systems where fine particulate contamination is unavoidable. Why Small Particles Matter More The purpose of this testing was to evaluate how automatic flow control valves perform in systems where a strainer is already installed. In real-world HVAC systems, strainers are standard, and they do a good job of blocking larger debris. So, this evaluation focused specifically on how valves handle smaller particulates that manage to slip through—materials like fine iron filings and oxides. Larger particles were not included in this study, for a good reason. Even in systems where such debris is present, large particulates tend to settle quickly. They don’t travel far, and they don’t circulate easily. This is because the movement of particles through a fluid system is heavily influenced by what’s known as the Reynolds Number—a calculation tied to the size (hydraulic diameter) of the particle and the characteristics of the fluid flow. According to Stoke’s Law, when the Reynolds Number is low (at or below 1), the drag force on a particle increases as the Reynolds Number decreases. This has been confirmed by experimental data and helps explain what happens in HVAC systems: smaller particles, which experience more drag, stay suspended in the flow and move throughout the system. Larger particles, with lower drag, tend to fall out of circulation more quickly. That’s why small contaminants—despite being nearly invisible—pose one of the greatest risks to flow control reliability. And that’s the kind of challenge this test was designed to address. When Flow Controllers Fail: What We Found in the Lab To better understand how automatic flow controllers perform under contaminated conditions, we set up a controlled lab test to simulate real-world HVAC system challenges. Using a custom-built open-loop system, we introduced iron filings and iron oxides into a 1 gallon-per-minute water stream at controlled rates of either 0.8 or 3.6 ounces per hour. At the end of the system, a filter collected the particulates, while the valve under test was installed just before this outlet. We varied the inlet pressure from 5 to 30 PSID and monitored water flow closely. The results were striking. Spring valve failure caused by one contaminant particle. Every single spring-loaded valve tested failed—many within the first few cycles. The culprit? Tiny iron particulates jamming the sliding members inside the valves. These spring valves rely on extremely tight internal clearances to function at high pressures. That precision, while necessary for performance, leaves little room for error—or debris. In fact, it took as little as one contaminant particle to stop the flow regulation entirely. In several cases, the amount of debris that caused failure was so small it couldn’t be measured. The mode of failure was consistent: particles lodged in the tiny gaps between the valve’s moving and fixed parts, locking them in place. And when the tests continued beyond the initial failure point, additional buildup occurred. Because these valves don’t open up significantly at lower pressures, more particulates gathered and further restricted flow, often reducing it to ineffective levels. Mesurflo ® valve maintaining flow despite particulate buildup. In contrast, Hays Mesurflo® performed reliably throughout testing. While some debris did accumulate at the base of the valve—particularly in low-velocity areas—this buildup didn’t impair functionality. That’s thanks to the Mesurflo’s unique design, which features no sliding parts and a generous opening between the orifice and diaphragm. During the low-pressure portions of the test, trapped particles were able to pass through and flush out naturally. Even at the higher contaminant rate of 0.8 oz/hr, the Mesurflo maintained accurate flow control throughout. SUPPORT For additional information or questions on the content of this article, please contact Hays Customer Service at 1-800-354-4297.

DESIGN COMPARISON Non-Clogging Quiet Accurate Lifetime Warranty Only Mesurflo® offers all four. VALVE INSERT OVERVIEW Mesurflo® Automatic Balancing Valves are the industry’s best, trusted by military and commercial installers. During a controlled hydronic system test with debris, the Hays Mesurflo® 1 GPM valve easily outperformed the competition . While the competitor’s valve clogged with debris instantanly, the Hays Mesurflo® valve maintained steady flow, demonstrating its reliability in real-world conditions. Contact Sales SPRING-BASED DESIGN Spring-based design wears over time, is clog-prone, and noisy resulting in a short lifespan and limited 5-year warranty. ~ VS ~ MESURFLO ® A diaphragm-based design that is durable, clog-resistant, and whisper-quiet, ensuring reliability and lifetime warranty. 5-YEAR Backed by a limited 5-year warranty, the spring-based design may wear over time. WARRANTY LIFETIME Backed by a lifetime warranty, our durable design ensures long-term reliability. EASILY CLOGGED A clog-prone design with tight components that seize with debris and can’t backflush. FLOW NON-CLOGGING A non-clogging design, no tight components, and backflush capability. NOISY OPERATION A conventional spring design is prone to chatter due to metal-on-metal contact. SOUND WHISPER QUIET A self-dampening design that minimizes noise, making it virtually silent in operation. SMALL OPERATING RANGE A limited operating range with multiple spring options, where 2-32 PSID is most common. RANGE WIDE OPERATING RANGE A wide operating range with a single setup, where 2-80 PSID is standard. WARRANTY Built to last, backed for life. Our lifetime warranty ensures unwavering reliability, giving you confidence in every product. If an issue arises, we stand behind our craftsmanship—because quality isn’t just a promise, it’s our standard. Contact Sales TECHNICAL DETAILS Parameter Specification Type Automatic Balancing Valve Available Sizes 1/2" to 36" Available Flow Rates 0.5 to 35,000 GPM Available Materials Brass, DZR Brass, Lead-Free Brass, Bronze, Ductile-Iron, Carbon Steel, & Stainless Steel Operating Pressure Diff. Range 2-80 PSID (for most common flow rates) Operating Temperature 32º F to 225º F Glycol Tolerance Up to 70% Accuracy ± 10 %

OUR TEAM We are one team committed to delivering a customized experience to solve your business needs. Leadership LEADERSHIP GIL SECO President Connect SHANNON FORREST Director of Operations Connect LISA BURCH Office Manager Connect VIRAL DHARAIYA Director of Engineering Connect Sales Team REGIONAL SALES MANAGERS KIRK PHIPPS Director of Sales Connect DANA PROTANO West (760) 902-5110 Connect KIRK PHIPPS Southeast (704) 915-5176 Connect PATRICK DOLAN Midwest (763) 257-2747 Connect RYAN LORD Northeast (401) 408-1017 Connect KIRK PHIPPS South Central (704) 915-5176 Connect Customer Support Team INSIDE SALES TAMMY VAN CAMP Inside Sales Manager Direct (704) 915-3301 Connect LISA HASKIN Administrative Assistant Direct (704) 915-3319 Connect THOR HASKIN Inside Technical Sales Representative Direct (704) 915-3326 Connect TRAMEL LOVE Inside Technical Sales Representative Direct (704) 915-3316 Connect SONYA ARMSTRONG Customer Account Manager - Government Direct (704) 915-3302 Connect BRANDON SMITH Inside Technical Sales Representative Direct (704) 830-1080 Connect Cell (980) 266-0190

FAQ Find answers to common questions on services, pricing, and installation. If you can't find your answer please reach out. We look forward to finding a simple solution. SHIPPING & DELIVERY SHIPPING & DELIVERY PRICING & ORDERS INSTALLATION AUTOMATIC BALANCING CONNECTION KITS COMPONENTS ATC VALVES SHIPPING & DELIVERY Can I Quick Ship certain products? Yes. Hays offers two Expedite programs - 24 hr and 48 hr Expedite - which shorten production lead time on some HVAC and Industrial products. Please call Customer Service at 704-922-9565 (Toll free: 800-354-4297), or send your request via email: orders@haysfluidcontrols.com . Our Expedite program guide with full details can be found here: Expedited Production Program How much will freight be? Can you Quote products with freight costs included? Hays does not quote freight due to the different weights and packaging of our products. What are normal lead times? Our standard lead time for most hose kits, piping packages, and Mesurflo® valves is 5 business days to build and ship; however, size, volume, and type of components on the order could impact that. For exact lead times, we recommend contacting Customer Service ( orders@haysfluidcontrols.com or at 800-354-4297) prior to placing your order. Where are weights listed so I can quote shipping costs to my customer? As weights vary based on connections and sizes for different product offerings, please call Customer Service ( quotes@haysfluidcontrols.com or at 800-354-4297) to get an estimate for weights on any specific order. PRICING & ORDERS PRICING & ORDERS Can I order from you? Our customers can order directly from us. We have several distributors located in almost every state to assist other requests. How do I find pricing? We work hand-in-hand with distributors around the country, for consumer pricing please reach out to one of these valued partners. If you are a distributor looking to carry Hays products, please reach out to info@haysfluidcontrols.com . Where can I find a list of distributors? We have several Industrial and HVAC manufacturers’ representatives and distributors located in different states. Please reach out to Customer Service ( quotes@haysfluidcontrols.com or at 800-354-4297) and they can help find a distributor in your area. Where can I find shipping info for an order I already placed? You can use our website under Tools tab and click on “Get Shipping Status” or click on this link to check on the status of your order. You will need to have your Sales Order (SO) number or Purchase Order (PO) number depending on shipping carrier in order to track the shipping status. You can also call us at 704-922-9565 or toll free # 800-354-4297 or email us at: orders@haysfluidcontrols.com with your PO number. What information do you need to quote a hose kit or piping package? To timely quote the Hose Kit or Piping Package, Hays need to know the basic information such as design flow rates, sizes, connection type, and others. If available the engineering specifications, piping details, and equipment schedules and submittals provide the information required to provide a proposal. In order to make life easier, we created Quote forms that can be completed with all pertinent information and sent to Hays to process the quote request faster. These Quote Forms are located in the Downloads section of our website. Request for Quote Forms can be found on our website at the following locations: Hose Kits 2-way Piping Package 3-way Piping package Can I convert the quote that I initiated using Hays Online Price Guide (OPG) tool into an order online from the website? Yes, you can use OPG to convert the quote into an order. If preferred, you can also do the same by contacting Hays Fluid Controls Customer Service team at 800-354-4297, or emailing us at: orders@haysfluidcontrols.com Where can I find warranty terms and conditions for Hays Fluid Controls products? Please visit our Downloads page and search Terms & Conditions. Alternatively, navigate to the Terms & Conditions page via navigation. INSTALLATION INSTALLATION Does Hays provide Flow versus Pressure drop charts for Manual Balancing Valves to balance the flow in the system? Yes, the flow versus pressure drop charts for Manual Balancing Valves sold by Hays are available on our Downloads page. our website. You can also follow the direct links below . 1/2" Venturi Manual Balance Valve (PDF - 84KB) 3/4" Venturi Manual Balance Valve (PDF - 83KB) 1" Venturi Manual Balance Valve (PDF - 82KB) 1-1/4" Venturi Manual Balance Valve (PDF - 82KB) 1-1/2" Venturi Manual Balance Valve (PDF - 83KB) 2" Venturi Manual Balance Valve (PDF - 83KB) Can I substitute a locally available washer in the braided hose connection? Yes but doing so will void Hays warranty. The washer used in the hose connection is a fiber washer. While a standard washer may fit in the assembly, it is always recommended to contact Customer Service (704-922-9565, toll free: 800-354-4297) to assist you with ordering additional gaskets from Hays whenever needed. Is there a special tool to remove the coupling nut for changing the diaphragm in Automatic Inline Balancing Valves? There is no special tool required for removing the Coupling nut on the Automatic Inline Balancing Valves (25E0, 2510, 2513, 2520). Is there a right way to install the diaphragm (rubber disk) inside the Hays Automatic Balancing Valves? The diaphragm (rubber disk) is not directional, as long as it is mounted up or down and not sideways, it will function to design. Please refer to Hays Fluid Controls Technical Videos under Downloads tab on our website for Internal flow cartridge replacement instructions in some automatic balancing valve bodies. Can Hays Automatic Balancing valves be mounted in any attitude or orientation? Yes, the Hays Automatic Balancing Valves can be mounted in any orientation. What valve size fits a coil connection OD of 5/8", 7/8", 1-1/8", 1-3/8", and 1-5/8" and so on? The size selection for coils can get trickier at times. The valves design for these coils are typically Female SWT and are soldered on the OD of coil connection. Please refer to the table below for selecting the Nominal size of Automatic Balancing Valve Sizes. Example: Select ½” FSWT connection for Hays Valves for coil dimensions with 5/8” OD and ½” ID. Copper Tubing Dimensions for FSWT connection: Valve Nominal Size (in) connects with Actual Outside Diameter (in) 1/2 = 5/8 3/4 = 7/8 1 = 1-1/8 1-1/4 = 1-3/8 1-1/2 = 1-5/8 2 = 2-1/8 COMPONENTS COMPONENTS What is the effect of Boiler chemicals (alkaline, solvents) on Hays Components? Most of the Hays components are compatible with standard boiler chemicals. For specific chemical compatibility information, please call Customer Service (704-922-9565, toll free: 800-354-4297) or send your inquiry via our Contact page . Are the Components compatible with steam systems? That's a tough one to answer without more detail. Please contact Customer Service ( quotes@haysfluidcontrols or by calling 800-354-4297) for information on specific components that can be used for Steam systems. CONNECTION KITS CONNECTION KITS What is the difference between a Piping Package and a Hose Kit? Piping packages and hose kits both share many common parts. The most significant difference between them is hose kits have a swivel end fitting and piping packages have a union fitting to aid in assembly. However, Hays also offers Flexible Piping packages with hoses that adds more options for customization based on customer needs. What is the Safety Factor Hays uses for Burst Testing their Hoses? Hays uses 4 times the Working Pressure to gauge their Burst testing pressure for hoses. For example, hoses supplied from Hays have 400 PSI working pressure and 1600 PSI Burst test pressure. Why is the Hays Mesurmeter™ better in Hose Kits than a Circuit Setter? The Mesurmeter™ takes advantage of a true venturi design, allowing more accurate flow measurement than the competitor's Circuit Setter. What is the female swivel thread type on Hays hoses? The female swivel on Hays hose is British Straight Pipe Thread (BSPT). If your situation calls for an alternative, BSPT Adapters are available for all other thread types; American straight thread, NPT, NPSH, JIC, and more. What is the comparable strength of the DOFI material to competitor's stainless steel? Please refer to the Gold Standard Brochure for more details. For any additional information, call Customer Service ( quotes@haysfluidcontrols.com or by calling 800-354-4297) to learn more about Hays products and how their technology is superior than competition. Are the female swivel hose threads compatible with American straight thread? Not directly but there is always a solution. Our female swivels are British Straight Pipe Thread (BSPT), not directly compatible with American straight thread. That said, BSPT Adapters are available to transition to American straight threads, NPT, NPSH, JIC, and other thread types. If sizes over 2” are available on Hose Kits, why aren't they published? Some of the configurations are not available under standard lead time or may not be stocked component and so it’s always advantageous to contact our Customer Service at 800-354-4297 or email us at quotes@haysfluidcontrols.com to assist you with the best engineered configuration for your needs. What is the default Mesh size for Strainer on Hays Packages? Can the mesh size be altered? The strainer on Hays packages comes with 20 Mesh size as default selection. Hays do offer other mesh sizes upon customer request. AUTOMATIC BALANCING AUTOMATIC BALANCING SOLUTIONS How do I "set" a valve that is automatic? Can I adjust the flow within the same valve? Hays Automatic Balancing Valves are designed to maintain one specific design flow rate value constant within published operating pressure differential range. The design flow rate is not field adjustable, but you can alter internals in most of the Hays Automatic Balancing Valves to achieve a different flow rate if the correct design flow rate was not picked during selection. Contact Hays Customer Service ( quotes@haysfluidcontrols.com or by calling 800-354-4297) for more details. How can I tell what the flow rate is on Hays Automatic Balancing valve installed in the system? Flow rate data is on the information label on the valve. In the event the label is not legible, use common flow measurement devices to determine the flow. Does Hays offer Automatic Balancing Valves in Bronze or Stainless Steel material? Hays offers Automatic Balancing Valves in Bronze C83600 and 316 Stainless Steel body material. You can find more information on our Marine Applications pages. How do the Internals of Hays Automatic Balancing Valves work? Here are some reference to understand the functionality of internals (also referred as Hays Mesurflo® technology) works. • Link to YouTube Video • Gold Standard Brochure • Hays Automatic Balancing Valves Brochure (refer to Page 5) Will Hays Automatic Balancing valves work with refrigerants? Hays Fluid Controls valves are designed to work with water and water glycol mixtures. At present we do not offer product to be used with refrigerants. Are Hays Automatic Balancing Valves compatible with commonly used chemicals for HVAC systems? Hays Automatic Balancing Valves are fully compatible with some known chemicals used for flushing the coil in HVAC systems such as Sodium Nitrate, Sodium Hydroxide, Borates, and Tolyltriazole. However, they are NOT compatible with Sodium Salts, Decahydrates, Sodium Saltwater, Tetras, Chlorine, or Bromines that are not commonly used for HVAC system. For more information on Chemical Compatibility with Hays product offerings, please call Customer Service (704-922-9565, toll free: 800-354-4297) or send your inquiry via our Contact page. Does Hays offer Automatic Balancing Valves that can be used for Domestic Hot Water system? Yes, Hays offer NSF/ANSI 61, 372 Certified 2517LF Lead Free Automatic Balancing Valves that can be used for balancing flows in Domestic Hot Water System. Link to 2517LF What function does the Mesurflo® technology perform in a hydronic system? The Mesurflo® technology maintains the flow rate at a pre-determined design flow rate with respect to dynamic pressure variations in the system within the specified operating pressure differential range. What is the difference between 2510 model and 2513 model in Automatic Balancing Valve Product selection? 2510 and 2513 are both Automatic Inline Balancing Valves but 2510 has Pressure/Temperature ports whereas 2513 does not. This Pressure/Temperature ports are used during troubleshooting and at times just to measure system conditions at any given time. Does Hays offer combination of Isolation Ball Valve and Automatic Balancing Valve, both integrated into one valve? Yes, Hays offers variety of integrated combo designs in different sizes and connections such as 2514, 2515, 2516, 2519, 2524 and 2528 as Automatic Y-Ball Balancing Valves. If you had an Automatic Balancing valve in your possession with label not legible, how would you determine its flow rate? The flow rate is determined by the combination of the orifice plate and the diaphragm combination. The orifice plate has a letter on it while the diaphragm has a colored indicator on one side. A matrix of the combinations with corresponding flow rates can be made available or please call Customer Service (704-922-9565, toll free: 800-354-4297) for more support to determine the flow rate. What is the accuracy range of Hays Automatic Balancing Valve? The design flow accuracy of Hays Automatic Balancing Valves is ± 10% of the nominal flow rate. This is equivalent to +/- 5% heat transfer effectiveness. More information on Mesurflo Automatic Balancing Valve tolerance can be found in our Gold Standard Brochure . Does Hays Automatic Balancing valves require straight lengths of straight pipe upstream or downstream for proper operation? No, Hays Automatic Balancing Valves do not require straight length of pipe before or after for proper operation. ATC VALVES ACTUATED TEMPERATURE CONTROL What ATC suppliers do you use? Hays currently uses Schneider Electric and Belimo Control Valve manufacturers but can source other brands based on customer requests. What type of ATCs do Hays currently offer in their product line? Hays offers the following basic types of ATCs on their packages: • On/Off Control – also referred as 2-position or Zone Valve • Floating Control – also referred as 3-point control • Proportional Control – also referred as Modulating control Where can I find the wiring diagram for ATC? Please contact Hays Customer Service quotes@haysfluidcontrols.com or by calling 800-354-4297 with specific ATC model quoted or selected for the project and we will be happy to provide additional details including wiring diagram for every specific model sourced from Hays. Does Hays offer Normally Open or Normally Closed selection for ATCs on Hose Kits? Yes Hays offers both options for ATCs on Hose Kits, more information on our ATC (Zone Valves) can be found in the Components section of our website. Which valves incorporate multiple orifice plates? The large, high flow valves have multiple orifice plates, specifically, the 2530, 2535, 2540, 2545, 2546, 2547, 2548, and 2570 valves. How does the Automatic Balancing Valve perform in conjunction with modulating ATC valves? Is it still effective and(or) required? The Automatic Balancing Valves helps to limit the flow to the maximum design flow at all conditions with respect to branch-to-branch variation when Modulating ATC valve is fully open. The Modulating ATC can thereby be used to modulate the flow below design flow to affect the temperature difference across the coil. It is very critical to size the Modulating control valves based on the system to provide better authority and system stability. More information on how Mesurflo® Automatic Balancing Valves perform with modulating zone valves can be found on our website here: Modulating Flow Control with Mesurflo