Industrial valves are indispensable flow control devices that regulate, isolate, initiate, stop, and alter the direction of fluids. These devices can also relieve excess pressure from a piping system or from pressurized vessels. There are multiple valve designs and sizes to suit different industrial applications. Choosing or utilizing the wrong valve can affect the quality and consistency of industrial processes negatively. Engineers consider several process variables, fluid properties and environmental conditions when sizing and selecting valves.
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Effective industrial valves should provide a reliable and durable fluid service ' dispensing fluids at the required flow rates, sealing against leakages, backflows and emissions, and maintaining optimal sensitivity to pressure and temperature changes in the pipeline. Valve components should provide adequate physical and chemical resistance to corrosion by service fluids and immediate environments.
Understanding the operation of different categories of valves is beneficial for choosing and customizing flow control solutions for several industrial applications. How complex is the valve selection process, and what factors should engineers consider when selecting industrial valves to minimize their total cost of ownership?
1.
Compatibility of Valve Materials with the Service Media
Industrial pipelines handle fluids with different physical characteristics ' they can be liquid, gaseous or semi-solid (slurries), with varying chemical compositions. One should explicitly understand the qualities of the service fluid before choosing a valve. Materials used to manufacture valves should provide adequate resistance to the erosive actions of service fluids. Abrasive fluids cause premature failure of internal components like seals and closing mechanisms.
Ensure that valve materials are compatible with the service media. Extreme fluid service pipelines ' like industrial chemical pipelines, viscous fluid service and cryogenic applications ' require valves made from stainless steel, molybdenum and/or even chromium alloys. The valves can utilize metallic or chemically resistant seals. These materials provide excellent corrosion resistance and can accommodate extreme temperature and pressure changes. If unsure of compatibility, always talk with a valve engineering expert to confirm proper configuration for your service.
2.
Temperature and Pressure Classifications
Every pipeline has a specific temperature and pressure class, defining the allowable operating range. The performance of an industrial valve should remain consistent as the pressure and temperature of the service fluid change. High process temperature and pressure can lower the strength of valve materials, increasing the risk of valve shell rupture.
When selecting industrial valves, one should confirm if the temperature and pressure range is within the desired pipeline ratings. Valve materials and wall thicknesses should accommodate the maximum pressure and temperature of the pipeline without failing over multiple cycles. The valve should provide a reliable safety margin, in case an emergency causes fluid conditions to exceed the designed limits. Manufacturers rely on standards like ASME B16.34, which defines the allowable pressure and temperature ratings for different body materials.
Selecting the Right Flow Control Valve: A Guide for Operators
Water flows, winds flow, and manufacturers prefer flow production, a term to describe the smooth and orderly movement of materials and components through the facility. The flow production method promotes efficient, streamlined output, and that means all components and systems must work in concert to achieve these efficiencies.
Flow control valves, although small components, are mighty in terms of keeping production flowing smoothly in chemical processing and other industry segments, as they regulate and direct the flow of liquids, gases, or slurries through piping systems, preventing disruptions and maintaining optimal process conditions.
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Some of the most common industries that regulate gas flow for example, in addition to chemical processing, includes the food and beverage sector, pharmaceutical and biotechnology applications, water/wastewater management, oil and gas, industrial gas, and the energy and power industry.
At the heart of any well-designed system is a minor yet critical component'the flow control valve. Flow control valves not only control the flow, as the name implies, but also the volume, direction, rate, and pressure of fluids and gases. As such, the flow control valve impacts the plant's safety and efficiency, its production and profitability.
However, selecting the appropriate flow control valve can pose a complex and challenging task due to the need to balance multiple, often competing system requirements and operating conditions. This selection of a seemingly simple component is complex due to:
The flow control valve needs to be carefully matched to the unique and sometimes changing demands of the fluid system. All the relevant specifications and known or anticipated operating conditions must be considered and balanced to select a valve for the most reliable, efficient and safe operation.
As an operator, the biggest hurdle when choosing a flow control valve is selecting the proper size and matching it to specific system requirements. The wrong selection could generate many issues ' from insufficient flow capacity to excessive pressure drops, control instability to premature wear and reliability problems. Carefully evaluate the key factors to select the proper flow control valve for optimal performance and long, trouble-free service life, for a true 'set it and forget it' component.
The first and most fundamental step is to accurately define your flow requirements. This means knowing the minimum, maximum and ideal flow rates you need the valve to handle. Consider not just your current needs, but any potential future changes or expansions to your system. Underestimating your flow requirements can lead to an undersized valve unable to meet your process demands. Conversely, overestimating can result in an oversized valve that creates excessive pressure drops and control challenges.
The physical properties of the fluid flowing through the valve can impact valve selection and performance. Factors like fluid viscosity, density, temperature and phase (liquid, gas, or two-phase) must be considered.
More viscous or dense fluids will require larger valve sizes to maintain the same flow rates as less viscous fluids. The potential for issues like cavitation and flashing must also be carefully evaluated based on the fluid's vapor pressure characteristics.
Closely related to a system's flow requirements are the pressure conditions. Operators should know the upstream and downstream pressures and the maximum allowable pressure drop across the valve. These pressure parameters will help dictate the valve size, trim and actuator needed to provide the required flow control while maintaining suitable pressure conditions. Ignoring pressure requirements can lead to control instability, component damage and safety hazards.
With the flow, pressure and control parameters defined, you can begin sizing the valve. This requires careful hydraulic or pneumatic calculations, computerized flow modeling, and close collaboration with the valve manufacturer like CPV Manufacturing.
The right valve size is critical ' too small and you will restrict flow, too large and you will battle instability and cavitation. The valve materials of construction must also be compatible with your process fluids to ensure long-term reliability and avoid corrosion or erosion issues.
Even the most carefully selected valve can underperform if the installation and maintenance practices are suboptimal. Factors like upstream and downstream pipe configurations, valve orientation, and accessibility for servicing must all be considered during the installation phase. Ongoing monitoring, adjustment and preventative maintenance are also essential to keep your flow control valve operating at peak efficiency throughout its service life.
Selecting the wrong flow control valve for your application can have serious consequences. An undersized valve will be unable to meet your flow demands, potentially starving critical equipment and disrupting your entire process. An oversized valve, on the other hand, can create excessive pressure drops, control instability, and cavitation-induced damage. Both scenarios can lead to reduced efficiency, higher energy consumption and compromised system reliability.
Given the complexity involved, operators are well-advised to work closely with experienced valve manufacturers and distributors when selecting flow control valves. Their technical expertise, application knowledge and sizing tools can be invaluable in ensuring you choose the right valve for your specific needs. Do not be afraid to lean on their guidance ' it could mean the difference between a smoothly running, reliable fluid system and one plagued by persistent control and performance issues.
CPV Manufacturing focuses its efforts on fabricating and supplying high-quality valves, fittings and supplemental equipment for demanding applications like the naval and aeronautics industries. CPV can offer tailored solutions crafted with care, or more standard valves in a wide range of sizes.
By partnering with our experienced team of engineers, we can collaborate with your team to select and meet your unique requirements for reliable, precise flow control of industrial gases or liquids. Learn more about our extensive product line of valves and fittings. Or speak to a member of our staff to discuss the specifications for your next project.
Be thorough in your analysis and do not hesitate to seek expert support. Get the valve selection right, and you will enjoy trouble-free operation and optimal performance from your fluid system for years to come.
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