Pressure Independent Valves a Good Solution for Water Source Heat Pump Application

    Posted on Thu,Oct 18, 2018 @ 09:00 AM

    In a water source heat pump (WSHP) application, a variable or constant speed pump accomplishes water distribution. The primary function of valves in a WSHP application is to allow a predetermined volume of water to enter each unit through either a water-to-refrigerant coil, water-to-air coil, or a water-to-water coil. The valves used are typically on/off control for full design flow when the WSHP starts. In most applications they are not required to control the amount of flow as in a traditional HVAC hydronic system.

    The benefits of using a pressure independent valve (PIV) for a water source heat pump:

    • Dynamically balances the system by responding to changes in differential pressure
    • Maintains design flow at part load and during morning start-up when all loops become critical
    • Each terminal receives the required flow, no overflow or underflow
    • Dynamic balancing allows a mechanic to easily commission a building and eliminates the need for rebalancing when alterations have been made to the hydronic system
    • Improves overall comfort and saves on pumping energy

    To select the right pressure independent valve determine the appropriate flow required for your heat pump and select the valve that satisfies this flow. Belimo’s pressure independent valve ranges from ½” to 6” with up to 713 GPM. This combination of pressure independent valve and variable-frequency drive (VFD) enables savings of pumping energy up to 90% of the time when the building load is less than full. More information on pressure independent control valves can be found online.

    H20585_Cooling_PIQCV-2


    H20585_Heating_PIQCV-2

    Tags: Belimo News, Technical Tips, Pressure Independent Valves

    Belimo Energy Valve™ is Now Solving Low Delta T Leveraging IoT

    Posted on Tue,Apr 11, 2017 @ 03:03 PM

    Belimo Americas is excited to announce the release of the new Energy Valve that is now an IoT device utilizing advanced cloud-based analytics to leverage captured system data to the full potential providing savings and the most efficient operation. The Energy Valve is a pressure independent valve, which measures and manages coil energy by using an embedded electronic flow meter, along with supply and return water temperature sensors. It is ideal for water-side control of heating and cooling coils with programmable maximum flow settings from 1.65 - 713 GPM in valve body size ½” to 6”. Some of the key features include:

    • Patented Power Control and Delta T Manager logic built-in, monitor coil performance and optimize the belimo_energy_valve.jpgavailable energy of the coil by maintaining the Delta T.
    • Glycol monitoring an exclusive feature ensures glycol content meets design needs to provide optimum efficiency and safe operation.
    • Cloud analytics provide recommended Delta T and flow setpoints which can be updated remotely
    • Dynamic coil performance illustrates the operation of the coil in real time accurately providing transparency of power degradation and other operational issues.
    • Most expansive communication platform on the market includes Cloud, BACnet MSTP and BACnet IP, Modbus, RTU and TCP/IP, Belimo MP-Bus, and one analog feedback signal for valve flow, power, temperature or position.

    Join us on Wednesday, April 19th at 1:00 PM EDT, Register Now

    In this 30 minute webinar you will learn about the new Energy Valve that is now an IoT device utilizing advanced cloud-based analytics to leverage captured system data to provide savings and the most efficient operation. The Energy Valve is a pressure independent valve that measures and manages coil energy by using an embedded electronic flow meter and supply and return water temperature sensors. New features include glycol monitoring, a suite of cloud services, enhanced web interface, dynamic coil performance, and the most expansive communication platform on the market today. Register today.

    Download Product Brochure

     

    Tags: Green Building Technology, Pressure Independent Valves

    New Belimo ZoneTight™ Zone Valves - Efficient in Every Way

    Posted on Wed,Apr 01, 2015 @ 10:00 AM
    Belimo Americas is pleased to announce the release of their new ZoneTight zone valves which are designed for maximum efficiency in tight spaces. The Belimo’s ZoneTight zone valve product range sets new design and performance standards for both pressure dependent and pressure independent zoning applications. Belimo ZoneTight Zone Valves
    • Belimo’s zero leakage ball valve design  eliminates energy losses and is resistant to clogging.
    • Low power consumption - up to 95% less than conventional zone valves.
    • Field adjustable flow to meet your design requirements.
    • Smallest pressure independent characterized ball valve in the market.
    • 5-year warranty.
    “The ZoneTight zone valves are unlike any other zone valve on the market today”, states Nigel Gallimore, Product Manager. “The PIQCV not only provides reliable, pressure independent control—it offers several advantages to those who design, install, and rely on flow control equipment.”

    Learn more online at www.belimo.us.

    Tags: Pressure Independent Valves, Green Building Technology, Belimo News, Product Updates

    Are Pressure Independent Valves a Good Solution for Water Source Heat Pump Application?

    Posted on Tue,Oct 07, 2014 @ 10:00 AM

    In a Water Source Heat Pump (WSHP) application, water distribution is accomplished either of two ways: variable speed pumping or constant speed pumping. The decision to use one over the other is usually made based on who has the most convincing argument. Because of the simplistic nature of a heat pump, the basic function of valves is to allow a predetermined volume of water to enter each unit through either a water-to-refrigerant coil, water-to-air coil, or a water-to-water coil. These valves are not required to control the amount of flow as in a traditional HVAC hydronic system.  Instead, they are on/off controlled to allow full design flow when the WSHP starts.

    What are the benefits?
    A Pressure Independent Characterized Control Valve (PICCV) dynamically balances a system by responding to changes in differential pressure. The PICCV regulator modulates in response to differential pressures in the system to maintain a constant differential pressure across the ball of the valve. The PICCV will maintain a constant flow at part load and during morning start-up when all loops become critical. With the PICCV, each terminal gets the required flow, no overflow or underflow at this critical time. The PICCV allows a mechanic to easily commission additional circuits after the initial system is up and running, again thanks to dynamic balancing capability. The PICCV is available in flow rates from .5 to 100 GPM. Choosing the right PICCV is as easy as determining the appropriate flow for your heat pump and then choosing the valve that satisf es the flow requirement.

    How does it work?
    The PICCV is ideally suited to save pumping cost associated with water source heat pumps. The PICCV with On/Off control actuator is used to isolate the zone coil from the main hydronic circuit when the space is not calling for heating or cooling. Hydronic friction is reduced and when the system pump is controlled with a VFD, the flow is matched to the load of the building. This combination of PICCV and VFD saves pumping energy 90% of the time when the building load is less than full. The PICCV is available with integral -S travel switch models. The switch is wired in series with the compressor enable circuitry to assure water is f owing through the coil before the compressor starts.

    Water Source Heat Pump Isolation Valve

    Learn more, down pressure independent valves technical documentation.

    Tags: Pressure Independent Valves, Technical Tips

    Energy Valve Proves Air Coils are Batting a Thousand

    Posted on Tue,May 27, 2014 @ 10:00 AM

    When sports fans crave game highlights or need to check the latest stats and ranking for their favorite teams, they turn to this large sports entertainment complex. This cable channel has been providing sports news and programming for more than 30 years. What started as one cable channel three decades ago is now a multimedia giant, with several sports channels televised in more than 200 countries.

    In July 2013, Belimo turned to this large sports entertainment complex when it needed to check some important stats, but these numbers had nothing to do with RBI’s or yards passing. The manufacturer brought its Belimo Energy Valves to see how they would perform on a 700 acre campus.

    The sprawling campus is home to several buildings with sophisticated HVAC mechanical systems. The buildings, which house the offices, radio stations, and broadcast studios, served as the perfect location to install the Belimo Energy Valve. The Energy Valve is a complete package including characterized control valve, BTU meter, and intelligent actuator with patented Delta T Manager™, on-board data storage and network integration capabilities. The Energy Valve package is easily installed and the sensor data used for the Energy Valve process logic can be also used for data acquisition purposes. The data can be used live, or stored in the actuator for later use. The data can be used to provide important and meaningful insights into the operation of a hydronic system. The Energy Valves rich data array and storage capability complements and unburdens the typical DDC system. What Belimo was able to find was a home run for their flagship valve product. 

    Keeping Score 

    According to this sports entertainment complex, its 18 building main campus is the company’s “mother ship,” employing close to 4,000 people. It’s the job of these employees to keep this 24/7 sports channel running. The buildings on campus are also an important factor. They need the most efficient and reliable mechanical systems in order for the show to go on. That is why Belimo chose this facility to install its Energy Valves. “We thought this facility would be a great site to show the strength of the Energy Valve in multiple ways,” said Ayotunde Williams, Manager of Product Management (water products) for Belimo.

    The goal of the project was to employ the Energy Valves at a building on campus and record the valve’s numerous data points. Those readings would later be compared to a similar building with no relation to the campus suspected of having a less than efficient mechanical system. “Belimo wants to show the strength of the communication you can get with the Energy Valve,” said Williams.

    “The information transfer via BACnet and the points of data can be used to understand how well the system is performing. Overall, we can end up using the data to even predict how much money a system like this would use in operation.”

    So what is the Belimo Energy Valve and what is it capable of recording? The valve is a two-way pressure independent control valve capable of monitoring a variety of data points, including Delta T. Low Delta T can be a major culprit when it comes to system inefficiencies. It puts a strain on HVAC systems and could cause cooling costs to skyrocket. If air-handling are oversized, demand too much water, or foul and degrade with age, low Delta T can occur. When cooling coils are not working up to their potential, the DDC requests more chilled water but the extra water has limited or no cooling effect. This negatively impacts the chiller. In some cases, buildings must install additional chillers to keep up with the water demand. The Belimo Energy Valve can monitor Delta T and maintain a predefined Delta T setpoint which ensures only the necessary amount of chilled water through the system.

    The Energy Valve includes temperature sensors to monitor supply and return water for energy 
    management. The valve can also document coil performance and prove that it is working to design specifications. A static IP address can be assigned to the valve, giving building operators the ability to log onto the internet with TCP/IP communication and see exactly how 
    the valve and system is performing. The IP address can also be assigned to a DDC network with BACnet MS/TP or BACnet IP communication. A technician can check system parameters and make changes to flow rates by simply connecting to the valve with a PC. Tablet devices can also be used to check valve readings while in the field.

    “One of the strengths of this valve is that it enables transparency of the heat exchange process – we can see how the cooling load is behaving,” said Williams. “It not only gives you the numbers, but allows you to analyze this data and to understand what these values mean and what has affected these values.”

    The Game Plan Automated Building Systems Inc. (ABS), a Belimo Platinum Distributor for many years, was responsible for the installation. The building automation company operates three locations in Glastonbury, CT; Southborough, MA; and Braintree, RI. It has been providing service to southern New England for the past 25 years, and has a roster of high-profile customers, including the headquarters of this large sports complex. ABS was tapped by Belimo to install the Energy Valves, which would be used to record numerous points of data, including water temperature, water flow, and thermal power.

    Bill Dauphinee, Project Manager at ABS, coordinated and contracted the individuals responsible for the installation at building no. 4. The building chosen for the project houses broadcasting studios and office spaces. It also shares the heating and cooling capabilities of a chiller plant with two other nearby structures. This chiller plant operates three chillers and has several mechanical redundancies. 

    At the top of this main building are two penthouses storing air handlers and controlsBelimoEnergyValve resized 600 equipment. Two Energy Valves were installed in each of the penthouses so that four cooling air handling units were equipped with Energy Valves. This was done in order to impact enough of the capacity and to show the difference in the overall system. It would also help to understand the different effects of the chiller water temperature and cooling.

    A total of four Energy Valves replaced older valves, which are now recording flow, temperature, power, energy, and position of the valve. Flow meters were added to measure the overall flow going into the buildings. The installation team also added meters to measure the actual current usage of the three chillers and added CFM meters to measure the velocity of air flowing across the specific air handlers. All of this was done to get the complete overview of what the Energy Valve was doing. Data from the controller was then used to validate that the Energy Valve was providing good comfort and useful data.

    Continue to read the entire case study - download now.

    Tags: Pressure Independent Valves, Green Building Technology

    New Compact Performance Solution that Manages Flow

    Posted on Tue,Jan 21, 2014 @ 10:00 AM

    The new ePIV is a 2-way pressure independent characterized control valve  describe the image
    with an integrated electronic flow meter and a powerful control algorithm. The ePIV maintains flow set point regardless of differential pressure variations. It achieves this with its powerful algorithm that modulates the valve based on its measured True Flow. The ePIV offers many features and benefits:

    • Compensates for pressure variations and perform dynamic balancing to maintain system performance at varying loads.
    • Valves are selected based on coil flow rate. No Cv calculations are needed.
    • Maintains pressure independent operation down to 1 psid.
    • Unlike mechanical pressure independent valves that provide an approximated/calculated flow feedback, the built-in electronic flow meter provides True Flow as a feedback to BAS systems.
    • Built-in CCV technology with high close-off pressure and zero leakage eliminates “ghost energy” losses in the system.
    • ZTH US handheld tool provides fast and easy access to settings and values.
    “The ePIV is unlike any other flow control device on the market today”, states Ayo Williams, Product Manager at Belimo. “The ePIV not only offers reliable, independent control—it offers several advantages to those who design, install, and rely on flow control equipment.”

    Learn more at www.belimo.us.

    Tags: Product Review, Pressure Independent Valves, Belimo News

    ePIV Now Available in Sizes ½” to 6”

    Posted on Mon,Jan 20, 2014 @ 10:00 AM

    Belimo releases the Electronic Pressure Independent Valve (ePIV) in sizes of ½” to 6”; a 2-way pressure independent characterized control valve with an integrated electronic flow meter and a powerful control algorithm. The ePIV directly measures flow by combining aPressure Independent Valve magnetic flow meter and a 2-way control valve. The actuator has a powerful algorithm that modulates the control valve to maintain the exact flow based on the control signal set by the DDC Controller. The flow reading is reported back to the controller using a standard signal, and this value can be used by the Building Automation System to perform advanced control and energy strategies.

    The advantabes of the ePIV:

    • Compensates for pressure variations and perform dynamic balancing to maintain system performance at varying loads.
    • Valves are selected based on coil flow rate. No Cv calculations are needed.
    • Maintains pressure independent operation down to 1 psid.
    • Unlike mechanical pressure independent valves that provide an approximated/calculated fl ow feedback, the built-in electronic flow meter provides True Flow as a feedback to BAS systems.
    • Built-in CCV technology with high close-off pressure and zero leakage eliminates “ghost energy” losses in the system.
    • ZTH US handheld tool provides fast and easy access to settings and values.

    Learn more at www.belimo.us.

    Tags: Product Review, Pressure Independent Valves, Belimo News, Product Updates

    Electronic Pressure Independent Valves are Now Available in ½” to 6”

    Posted on Tue,Dec 31, 2013 @ 10:00 AM

    Electronic Pressure Independent Valve  (ePIV) are now available in sizes ½” to 6”. The ePIV directly measures flow by combining a magnetic flow meter and a 2-way control valve. The Electronic Pressure Independent Valvesactuator has a powerful algorithm that modulates the control valve to maintain the exact flow based on the control signal set by the DDC Controller. The flow reading is reported back to the controller using a standard signal, and this value can be used by the Building Automation System to perform advanced control and energy strategies.

    Pressure Independent Valve Comparison

    Pressure Independent Valve Comparison

    With pressure independent control technology only a single valve is required to maintain proper flow through each circuit. Each valve arrives from the factory pre-set for each circuit, so there is no additional balancing required. The system performs perfectly from start-up. And if a facility adds new circuits as a result of expansion, the flow control of existing circuits remains intact – so no rebalancing is required. Pressure independent valves can be used to regulate flow through air handlers, heating and cooling coils, fan coil units, unit ventilators and VAV re-heat coils.

    Valves are selected based on the GPM requirements of the coil and no Cv calculations are needed. By precisely controlling the flow, the pressure independent valves eliminate the need for balancing valves, thus reducing the installation and balancing cost. By far, the biggest benefit for the owner comes in the form of energy savings by eliminating overflow thru the coil. Overflow wastes energy by over pumping and is the main cause of the low ΔT syndrome in chilled water systems.

    Learn more, download the product brochure.

    Tags: Pressure Independent Valves, Belimo News

    The Belimo Energy Valve™ Cures Medical University’s Low Delta-T

    Posted on Mon,Nov 04, 2013 @ 10:00 AM

    The University of Miami medical campus saves thousands of dollars and increased plant capacity with the Belimo Energy Valve retrofit.

    The University of Miami’s Leonard M. Miller School of Medicine says it prides itself on bringing medical research from “bench to bedside,” meaning doctors are providing patients in Southern Florida with the latest cutting-edge developments in medical care. On its sprawling campus and in its state-of-the-art buildings, doctors and researchers are unlocking the secrets to not only infectious diseases, but the future of stem cells and genetics.

    What many people may not know is the preventative care that is going on behind the scenes when it comes to the university’s mechanical systems. At the heart of the university is a 47,000-sq-ft chiller plant with 12,000 tons of installed capacity, providing the much-needed cooling and chilled water for the campus’s hospitals and research buildings. While the chiller plant is still fairly new, having just opened in 2011, some buildings on campus were not operating as efficiently as they could, wasting thousands of gallons of chilled water. However, the problem was not with the chiller plant, but the cooling coils in several of the campus facilities.

    The solution to the problem came in the form of the latest research and development from Belimo — The Belimo Energy Valve.Energy Valve Installation at University of Miami

    The diagnosis – Low Delta-T
    It‘s a common mechanical illness - Low Delta-T. It occurs when air-handling coils are oversized, demand too much water, or foul and degrade with age. Poor system balance and improperly installed and controlled air handlers can also contribute to low Delta-T.  
    When this happens, air-handler efficiency and heat transfer plummets. In turn, chillers and pumps work overtime in order to maintain a given temperature set point. Return water temperature to the chiller is lower than the intended design forcing more water to be pumped through the system. As more and more gallons of water move through the system, not only is efficiency in question, but utility costs can go through the roof.
    This was the diagnosis for some of the buildings on the University of Miami Medical campus. Even with a new chiller plant, and a mix of new and older facilities, low Delta-T was negatively impacting the efficiency on campus — that is until Kerney and Associates of Dania Beach, FL, stepped in.

    The specialty piping and energy services company has had the University of Miami Medical campus as a client for several years, so when they learned about the Belimo Energy Valve, they knew it was something they had to share with the university, especially since Kerney and Associates specializes in retrofit opportunities that will provide a maximum return on investment for clients.

    “We do a lot of business with them,” said Ron Bogue, Assistant Vice President for facilities and services at the UM Medical campus. “They came to us and introduced us to the Belimo Energy Valve line.”

    The Energy Valve is a pressure independent valve optimizes and documents water coil performance. The valve includes an electromagnetic flow sensor and temperature sensors that monitor supply and return water. Differential temperature is monitored to make sure that the Delta-T across the valve is performing at the desired set point. If Delta-T drops, the valve modulates the flow of water at the coil, which improves system efficiency.
    To make sure that the valve and the coils are working as specified, the valve also has BACnet capabilities. Each valve has a static IP address, allowing technicians on campus to
    log on to the Internet, via a PC or tablet device, and check Delta-T readings and flow efficiency at the valve in real time.

    “It is a very informative diagnostic tool,” said Bogue. “I’m a facilities guy who is definitely into preventative maintenance. We are always looking for ways to improve efficiency and preventative services on campus.”

    With the valves BACnet capability, he says that much of the guesswork is taken out of the diagnostic component. Any efficiency issues with the valves, the coils, or with low Delta-T can be quickly identified and fixed. Technicians can even change the flow of the valve or modify parameters remotely from their office or in the field.Delta T Webview

    “You can go online and make sure that the coil was designed to do what it was supposed to do,” said Bogue. But before Bogue was completely sold on the Energy Valve, he took it for a test run. The results were even bigger than expected.

    Immediate Results
    To prove that the Energy Valve could do what it was designed to do, Scott Czubkowski, PE, Director of Engineering at Kerney Associates, installed the valve at the university’s Clinical Research Building. The building houses over 300,000 sq ft of research space, including research in pediatrics and pharmacology. It is also one of the newest buildings on campus, opening in late 2004. Even with the building less than eight years old, it was still lacking in efficiency.

    On average, the building was seeing a 7-degree Delta-T and inefficient energy transfer.    

    “Some of the air handlers were three or four years old and were not performing optimally,” said Czubkowski.

    An Energy Valve was installed on a 175-ton heat exchanger that was transferring energy at a 3-degree Delta-T. The results were verified through the valve’s analysis tool, which stores up to 13 months of system data in the actuator. Data includes absolute flow, absolute power, and temperature. All of these components can then be compared and analyzed to see improvements in the system. Czubkowski found that when the Belimo Energy Valve was installed the system reacted almost immediately.

    At the initial start-up of the valve, Czubkowsi was able to see that heat exchanger’s Delta-T was at 3.5 with a gallon per minute (GPM) reading of 520. In less than an hour, the Energy Valve Delta-T Manager took over control of the coil and the Delta-T rose to 6.5 and the flow was reduced to 300, see Fiqure 1. The flow rate continued to drop as the day went on.
    As heat exchanger performance increased, the entire building saw an improvement in Delta-T.
    “The University started seeing a 10-degree Delta-T,“ said Czubkowski. “It went from a 7-degree to a 10-degree Delta-T within a day.“

    That wasn’t all. Kerney and Associates found that within one hour, the system went from using 600 gallons of water to 100 gallons per minute. With those kinds of immediate results, Czubkowsi said that Bogue was able to validate that the technology worked.

    If the Belimo Energy Valve could have that kind of result in a newer campus building, what kind of impact could it have on an older building? The university decided to purchase more of the Energy Valves and find out.

    Typical Medical Center Savings EstimateOlder Building, Big Results
    After the success of the Clinical Research Building, Czubkowski and his team tackled the university’s 450,000 sq ft Rosenstiel Medical Science Building. The 35-year-old building houses the internal medicine, hematology, and oncology departments. 

    Czubkowski illustrates in Figure 2 the potential savings a typical medical center could have.
    Eleven major air-handling units at 30,000 cfm each serve the building. Some of the air-handling equipment is almost as old as the building itself, and the air-handling coils at the AHUs had degraded over time. Delta-T was hovering around 7 or 8, which according to Bogue, meant the system was “wasting thousands and thousands of dollars in energy.”

    With the Belimo Energy Valve installed, the Rosenstiel Building started to see a Delta-T of 10.5 to 11.

    According to preliminary calculations, Kerney and Associates believes that the University of Miami will see a three- to four-year payback on the valves it purchased for the Rosenstiel Building. Each of the 11 valves installed should create a $6,000 utility savings, bringing the total annual savings cost to an estimated of over $60,000.
    And Bogue and his mechanical team can make sure that facilities such as the Rosenstiel Building continue to save on utility costs and keep adequate Delta-T readings. As part of its preventative maintenance initiative, Bogue frequently checks the valve performance in the buildings by using the BACnet capabilities.

    “Each valve has an independent IP address,” he explained. “I can go in and look up the numbers.

    It comes up on the screen and we can see the gallons per minute flowing through the valve.”
    If Delta-T readings go under an intended set point, an alarm will go off to notify mechanical staff that there is a problem. Bogue said that the university is no longer dealing with a “blind side” when it comes to system efficiency and the amount of water that is being wasted
    on campus.

    These results have prompted the University of Miami to continue installing the Belimo Energy Valve. Work is scheduled to install the valves at two more campus buildings. First on the list is the Batchelor Children’s Research Institute. The building will install four Energy Valves to control a 1,000-ton chiller load.

    The newest building, the Biological Building, will also adopt the Belimo Energy Valve technology. Not only is it the newest building on campus, it also boasts the largest air-handling units on campus. When the air handlers are retrofitted, the university will be able to make sure their newest building is operating as intended and not wasting chiller water.
    “Belimo has really stepped up the game,” said Bogue. “This is the leading edge of the future from a diagnostics standpoint.”

    Download Case Study

    Tags: Product Review, Pressure Independent Valves, Green Building Technology

    Pressure Independent Valves for Terminal Unit Applications

    Posted on Mon,Sep 02, 2013 @ 10:00 AM

    With Pressure Independent Characterized Control Valve (PICCV), every system lives up to its full potential – saving time, money, and other precious resources.

    It’s a fact. Efficient operation of a flow system cannot occur without effective flow balancing and control. System instability and even minor performance anomalies will rob owners of comfort and efficiency throughout the life of the system.

    Pressure independent technology helps owners maximize the energy savings of variable flow pumping systems while addressing their unique control challenges.

    PICCVs directly control the water flow required by the coil and is not affected by pressure fluctuations in the system. The valves are selected based on the GPM requirements of the coil without the need for Cv calculations. By precisely controlling the flow, pressure independent valves eliminate the need for balancing valves, thus reducing the installation and balancing cost. The biggest benefit for the owner comes in the form of energy savings by eliminating overflow thru the coil.

    Pressure independent valves stabilize variable flow systems for a lifetime of efficiency and worry-free, automatic balancing.

    Everyone agrees that variable flow pumping systems have the potential to save facilities significant pump energy cost. But all too often these savings quickly disappear due to complex flow issues. With pressure independent control technology only a single valve is required to maintain proper flow through each circuit. Each valve can be shipped from the factory pre-set for each circuit, so there is no additional balancing required. The system performs perfectly from start-up. And if a facility adds new circuits as a result of expansion, the flow control of existing circuits remains intact – so no rebalancing is required. Pressure independent valves can be used to regulate flow through air handlers, heating and cooling heat exchangers, fan coil units, unit ventilators and VAV re-heat coils.

    How It Works
    Pressure Independent Characterized Control Valves (PICCV) combine a differential pressure regulator with a 2-way characterized control valve to supply a specific flow for each set degree of ball opening – regardless of system pressure fluctuations. The valve performs the function of a balancing valve and control valve in one unit. Therefore, the flow characteristic and operation of the valve is not distorted when system variables change.

    As flow passes through the valve, a uniquely designed differential pressure regulator moves according to the change in pressure above and below it. The regulator assembly adjusts to the differential pressure increasing and decreasing the orifice opening so the differential pressure across the characterized control valve stays constant. The valve maintains a constant exiting flow despite any and all changes in system activity that results in pressure variation (i.e. system expansion and or redesign).

    New Offerings with Exceptional Value
    Belimo released the PICCV with the LRB24-SA actuator which offers a complete package; a PICCV with LR Actuatormodulating balancing valve, flow verification orifice and pressure independent control valve in an economic package. Flow orifice (-F models) allow independent differential pressure  gauge verification of flow.

    The proportional control LRB24-SA actuator features a simple push button flow setter to field set required flow. When the coil design flow is less than the factory default setting adjustments are made instantly without tools. A perfect solution for custom flow needs.

    • Factory set to max flow position – must be field adjusted to achieve required flow.
    • Factory default flow setting is equal to the maximum GPM rating of the valve body.
    • Push button flow setter illuminates when max flow is achieved providing visual feedback to operators.
    • Industry standard flow orifice option regulates flow setpoint regardless of DP changes.

    Also now available is the PICCV with the KRB24-3 actuator which offers a floating point control and is an economical solution for smaller spaces without compromising functionality or efficiency. If features a fine tooth gear wheel to field set required flow.

    The PICCV with the KR offers simple flow customize feature and when factory furnished with a flow orifice users have an independent device to validate flow. Once the flow is set, the PICCV takes over precisely controlling flow and eliminating coil overflow providing system efficiencies and energy savings.PICCV with KR24-3 Actuator

    • Factory default flow setting is equal to the maximum GPM rating of the valve body.
    • Quick field set balancing with tab locking mechanism when coil flow is less than factory default setting.
    • Position indicator provides visual feedback of flow to operators.

    Download Additional Information.

    Tags: Pressure Independent Valves, Belimo News, Product Updates