�ǳ�web Knowledgebase - EV

Designing for Life: Overcoming Pneumatic Challenges in ECMO Systems

Rachel Desenberg — Tue, 25 Mar 2025 16:41:58 +0000

Category:

Extracorporeal Membrane Oxygenation (ECMO) represents one of the most critical and complex applications in medical engineering. Serving as a temporary substitute for the heart and lungs, an ECMO system removes blood from the patient, filters out carbon dioxide, oxygenates the blood externally, and returns it to the body. The pneumatic system that makes this possible must deliver precise, reliable control over every variable—gas concentration, flow rate, and system pressure—often within an extremely limited footprint.

Understanding the Pneumatic Demands of ECMO

The pneumatic control architecture in an ECMO unit is typically divided into three primary areas. First is the regulation of the sweep gas—a controlled blend of oxygen and air responsible for carbon dioxide removal. This process requires fine-tuned, closed-loop control to ensure metabolic stability. The second is the blending of oxygen concentration, or FiO₂, which must be adjustable to meet each patient’s evolving respiratory needs. Lastly, engineers must control the pressure and flow through the membrane oxygenator, maintaining steady operation while avoiding damaging pressure spikes or transients.

Subscribe to �ǳ�web's YouTube channel

Engineering Constraints: Size, Power, & Performance

From a design standpoint, the challenge begins with miniaturization. These systems are often mobile or transport-capable, meaning every component must meet strict spatial constraints without sacrificing performance. Engineers are routinely forced to balance flow capacity, pressure range, and thermal stability against size and weight targets. Compounding that is the need for redundant safety architecture and deterministic system behavior—valves must actuate precisely, repeatably, and with minimal hysteresis. This becomes especially critical in closed-loop circuits where real-time responsiveness and accuracy directly affect patient outcomes.

Power consumption is another limiting factor, especially for systems relying on battery backup. Valves with high current draw can generate unwanted heat, which risks interfering with nearby sensors or inducing thermal drift in pressure control. Quiet operation is equally important. Valves that emit audible clicks or mechanical vibration can cause issues for sensitive sensor arrays and may contribute to patient discomfort, particularly in neonatal or intensive care environments.

Material Compatibility & Cleanliness Standards

Engineers must also consider cleanliness and regulatory compliance. Components must meet ISO Class 8 or better for use in oxygen-enriched environments. This often involves sourcing valves that are oxygen-cleaned, feature inert internal materials like PTFE or stainless steel, and are free from elastomers that may off-gas under pressure.

Choosing the right valve for ECMO isn't simply a matter of selecting a high-flow or fast-acting model. The ideal solution must feature minimal internal volume to prevent gas mixing, deliver response times on the order of 10 milliseconds or less, operate at low wattage to preserve system power, and provide reliable sealing to ensure zero or near-zero leak rates. Valves must also be capable of high cycle counts with minimal performance degradation, maintaining tight tolerances over time in the face of continuous actuation.

While multiple valve technologies exist, �ǳ�web’s spider-based designs have proven particularly effective in critical care applications due to their compact footprint, rapid response characteristics, and proven longevity. In ECMO systems, spider valves are often employed in both proportional O₂ blending circuits and fast-acting isolation points for sweep gas control. Their consistent performance under tight power and space constraints makes them a natural fit for life-support designs.

Integration Over Selection

Ultimately, the key to success in ECMO development isn’t just about selecting the right valve—it’s about engineering the right solution. Many OEMs work directly with pneumatic specialists to develop custom valve-and-manifold assemblies that reduce part count, simplify assembly, and improve system reliability. These integrated solutions streamline the development process and free engineers to focus on clinical performance rather than component-level plumbing.

�ǳ�web’s experience in life science pneumatics, especially in high-precision oxygen control, makes us a trusted partner for ECMO and other life-support platforms. Whether you're in early-stage development or working to optimize a production system, we understand what it takes to build devices that must perform flawlessly, every time. Ready to get started? Contact us today to discuss your specific application.

Related Products
ES Series	DV Series	EV Series

Related Content

Tags:

ECMO

spider

Maximize Reliability in Harsh Environments with Corrosion-Resistant EV Series

Rachel Desenberg — Fri, 24 Jan 2025 16:19:20 +0000

Category:

Applications

Corrosion, malfunctions, and costly downtime are always a concern when designing systems that will be exposed to harsh outdoor conditions. But what if you could specify a valve that you could trust to maintain top-tier performance while withstanding rain, humidity, salt spray, and extreme conditions? �ǳ�web’s Corrosion-Resistant EV Series combines our innovative Spider Technology with rugged stainless steel construction to deliver unparalleled reliability in even the harshest conditions, making it an ideal choice for a wide range of environmental monitoring applications including water quality monitoring systems, air pollution analyzers, and atmospheric research equipment.

The Power of Spider Technology for Exceptional Durability

At the heart of the EV Series valve is �ǳ�web's innovative Spider Technology, which sets the foundation for exceptional reliability and performance. This unique design incorporates a single moving part with just 0.007 inches of travel, a feature that minimizes wear and tear over time. The result is a valve capable of handling more than one billion cycles—ensuring that your system operates efficiently for years, even in demanding environments. For your critical systems, this translates to:

• Reduced maintenance
• Minimized downtime
• Uninterrupted data collection
• Increased equipment lifespan

Corrosion-Resistant Design with 430 Stainless Steel

One of the standout features of the Corrosion-Resistant EV line is the use of 430 stainless steel components. In applications where the valve will be used outdoors, even if protected from the elements, exposure to moisture, dust, and environmental contaminants can lead to corrosion in traditional valves. This line uses the same simple, efficient Spider Technology as �ǳ�web's standard EV series but replaces all electroless nickel-plated steel components with stainless steel. This upgrade provides enhanced corrosion resistance, ensuring the valve performs reliably even in humid, coastal, or high-salinity environments.

Performance That Meets Your Demands

While the Corrosion-Resistant EV Series valve is engineered to be highly durable, that durability does not come at the cost of performance. These valves operate with a nominal power consumption of 1.2 watts, ensuring efficient energy use while maintaining fast response times between 5 to 10 milliseconds. This quick response time is crucial in environmental monitoring, where precise, immediate control of air or fluid flow is essential for accurate readings.

For instance, imagine an environmental monitoring system designed to measure water levels in streams or reservoirs, where a valve needs to pulse compressed air at regular intervals to displace water and trigger sensor readings. These valves need to be durable, energy-efficient, and resistant to outdoor elements like rain, humidity, and dust. They must also respond swiftly to ensure that each cycle of air release is accurately timed and controlled. �ǳ�web’s Corrosion-Resistant EV Series can precisely control airflow to sensitive analyzers in air quality monitoring stations, ensure reliable operation of remote weather stations in extreme climates, and enable the development of compact, robust portable monitoring systems for field deployment.

Key Specifications for Design Engineers

• Cycle Life: >1 billion cycles
• Size: Compact, ideal for space-constrained designs
• Internal Volume: Low, minimizing waste and maximizing efficiency
• Response Time: 5-10 ms
• Operating Temperature: 32 to 150˚F (0 to 65˚C)
• Materials: 430 stainless steel for superior corrosion resistance

�ǳ�web’s Corrosion-Resistant EV Series valve delivers the perfect combination of durability, performance, and corrosion resistance for applications in harsh environments. Whether you’re designing systems to monitor water quality, measure air pollutants, or collect environmental data, engineers all around the world trust �ǳ�web’s renowned Spider Technology to ensure their equipment operates reliably, efficiently, and with long-lasting performance.

Ready to learn more? Contact �ǳ�web today to discuss your specific application needs.

Related Content

�ǳ�web's Spider Technology

Related Products
Corrosion-Resistant EV Series	Standard EV Series	Oxygen Clean EV Series	Analytical EV Series

Tags:

corrosion-resistant

Oxygen-Compatible Valves for Oxygen Mixing Applications

Rachel Desenberg — Wed, 15 Jan 2025 16:51:28 +0000

Category:

Applications

When working in oxygen-enriched environments, such as with oxygen mixing applications, selecting the right components is critical to ensure both safety and functionality. One of the key components in these systems is the valve, which controls the flow of gases. For engineers designing systems in medical, aerospace, or other oxygen-sensitive environments, using oxygen-compatible valves is not just a best practice—it's a necessity.

In this article, we'll explore the critical factors that make a valve oxygen-compatible, highlighting key considerations for design engineers. We’ll also introduce �ǳ�web’s solutions for oxygen mixing applications, offering a detailed look at how they meet the unique demands of this high-stakes field.

Subscribe to �ǳ�web's YouTube channel

Two Key Factors for Oxygen-Compatible Valves

When it comes to selecting valves for oxygen-enriched environments, there are two main factors that determine compatibility: material selection and cleanliness. Both are crucial in preventing contamination, ensuring safety, and maintaining reliable operation in systems that handle oxygen.

1. Material Compatibility with Oxygen

The materials used in the construction of the valves must be compatible with oxygen. This is especially important in high-oxygen applications, where certain materials can react with oxygen and pose a risk of combustion or degradation.

In �ǳ�web’s oxygen-compatible valves, the wetted materials (those that come in direct contact with oxygen) are carefully selected to be compatible with oxygen use. Typically, these valves are constructed using standard materials, but with modifications to enhance their safety and performance in oxygen systems. These modifications include:

•PTFE Grease: A non-reactive, oxygen-compatible lubricant that ensures smooth valve operation without the risk of contamination.

•FKM Seals: Fluoroelastomer seals, known for their excellent resistance to a wide range of chemicals, including oxygen. These seals help maintain a tight, leak-free seal and reduce the risk of material degradation.

By using these specially chosen materials, �ǳ�web’s valves maintain their integrity and performance in oxygen environments, helping to minimize the risk of failure in critical applications.

2. Cleanliness and Contamination Control

Contamination control is another critical factor when designing valves for oxygen environments. Oxygen is highly reactive, and even minute traces of contaminants—whether organic or inorganic—can lead to dangerous situations such as fires, oxidation, or system malfunctions.

�ǳ�web takes cleanliness to the highest level by ensuring that all oxygen-compatible valves are:

•Ultrasonically Cleaned: A process that removes any contaminants from the valve components before assembly. Ultrasonic cleaning uses high-frequency sound waves to create microscopic bubbles that help dislodge dirt, oil, and particulate matter from surfaces.

• Assembled and Inspected in a Clean Room: Every valve is assembled and inspected in a positive pressure clean room that exceeds ISO 13485 standards. This clean room environment ensures that the valves are free from contaminants that could compromise their performance in oxygen systems.

• No Organic Sealants or Lubricants: To prevent contamination, �ǳ�web valves are manufactured without the use of organic sealants or lubricants, which could introduce harmful residues into the system.

• Individual Testing with Medical-Grade Nitrogen: Each valve is subjected to rigorous testing and calibration using medical-grade clean nitrogen. Dedicated test fixtures and precision inspection techniques—such as magnification, visual inspection, and ultraviolet light—ensure that no hydrocarbon oils or particulate contaminants are present.

This comprehensive cleanliness protocol ensures that �ǳ�web’s oxygen-compatible valves meet the stringent requirements for high-risk applications, providing peace of mind to engineers and end-users alike.

�ǳ�web’s Expertise in Oxygen-Compatible Valves

�ǳ�web’s commitment to quality and safety has made us a trusted partner for engineers working with oxygen and other sensitive gases. With years of experience working with medical device manufacturers and other industries that require the highest levels of safety, we are well-positioned to support your most challenging oxygen-related design needs.

Whether you're designing a system for medical oxygen delivery, aerospace applications, or industrial uses, our range of electronic on/off and proportional valves can be tailored to meet your specific requirements. By partnering with �ǳ�web, you gain access to valves that not only meet the technical requirements for oxygen mixing applications but also exceed industry standards for safety and performance.

Ready to learn more? Contact us today to discuss your specific application requirements.

Related Products
Oxygen Clean EV Series	Analytical EV Series

Related Content

Tags:

oxygen

Innovating Under Pressure: Ventilator Solutions for Respiratory Support

Rachel Desenberg — Mon, 23 Sep 2024 17:17:53 +0000

Category:

Videos

As engineers, we are constantly challenged to solve complex problems, but sometimes the stakes go beyond efficiency and innovation—they are about saving lives. During the height of the COVID-19 crisis, ventilators became essential tools for supporting patients unable to breathe on their own. The global shortage of these devices placed immense pressure on manufacturers and engineers to deliver solutions quickly and precisely.

Ventilators rely on a delicate balance of components to replicate the body’s natural breathing process. They must regulate the flow of oxygen, air, and carbon dioxide with exceptional precision, ensuring the right mixture for each patient. The precision needed to replicate this biological function requires carefully timed sequences of valves, flow controllers, and gas regulation systems—all working together in harmony. This is where �ǳ�web’s flexible manufacturing capabilities and ability to innovate under pressure made a crucial difference.

Precision for Every Breath

A ventilator does more than push air into the lungs; it ensures the right balance of life-essential gases. Every breath must be precisely calibrated—delivering the correct amount of oxygen and expelling carbon dioxide. A slight shift in balance could be life-threatening.

This is where engineering expertise is crucial. Designing a system that regulates pressure, flow, and gas mixtures requires meticulous attention to detail. The challenge is ensuring consistent performance in a life-support application where even the smallest miscalculation can have severe consequences.

Video filmed at �ǳ�web in Cincinnati, Ohio

Subscribe to �ǳ�web's YouTube channel

�ǳ�web's Swift Response: Delivering Critical Solutions

In response to the ventilator shortage, �ǳ�web quickly adapted to the crisis. Our flexible manufacturing capabilities enabled us to design and deliver a special manifold solution that incorporated high-performance �ǳ�web components.

At the core of this solution were our low decibel, low power, high life cycle EV valves. These valves provided the precise control of air and gas flow essential for ensuring the correct delivery of oxygen, air, and carbon dioxide. In a life-support system, reliable and consistent performance is key, and �ǳ�web’s valves excelled in providing that.

Additionally, we incorporated our Cordis Series flow controllers into the design. These controllers allowed for fine-tuned regulation of gas flow, ensuring the exact mix of oxygen and air was delivered in precise quantities for each patient. This level of accuracy is critical in critical care applications, where even the slightest deviation can lead to serious health risks.

Engineering Under Pressure: The �ǳ�web Advantage

�ǳ�web’s ability to deliver in such a high-pressure situation wasn’t just about having the right products—it was our ability to think fast, adapt, and innovate under pressure. Our deep understanding of precision fluid control, coupled with our flexible manufacturing capabilities, allowed us to meet the urgent demand for ventilator solutions with quick turnaround times and exceptional performance.

The high life cycle and low energy consumption of our EV valves made them ideally suited for the demanding environments of ventilators, where components must perform reliably over long periods without failure. In addition, the precision of the Cordis Series flow controllers ensured that the correct gas ratios were consistently delivered, preventing dangerous fluctuations in gas mixtures.

Designing for Critical Care: A New Standard

The ventilator shortage underscored the importance of rapid innovation and precision in critical applications. It was a reminder that engineering solutions must not only be technically sound but adaptable to real-time needs. In times of crisis, quick thinking and high-caliber engineering can have a direct impact on the outcome.

�ǳ�web’s engineers embraced this responsibility, ensuring that our solutions enabled ventilators to provide consistent, life-saving care in hospitals. The impact went beyond simply meeting production demand—it was about delivering the precision that enabled these life-support machines to function safely and effectively.

The Future of Engineering Solutions

In high-stakes applications like critical care, the ability to innovate quickly, adapt to changing needs, and deliver reliable solutions is essential. �ǳ�web’s flexible manufacturing capabilities and commitment to excellence allowed us to step up when it was needed most, delivering the components that helped ventilators function with the precision and reliability required for patient care.

As we look forward, the lessons learned from this experience remain crucial. When urgency meets ingenuity, we can save lives. Whether you’re working on ventilators, medical devices, or other applications that require precise fluid and gas control, �ǳ�web’s solutions are designed to meet the highest standards of performance and reliability.

Let’s continue designing systems that not only solve problems but contribute to saving lives when it matters most. Ready to get started? Contact us today to discuss your application.

Related Products
Cordis CFC Series Flow Controller	EV Series Electronic Valves

Related Content

Tags:

CFC

Custom Refrigerant Valve for Monopolar RF Equipment

Rachel Desenberg — Tue, 25 Jun 2024 13:43:50 +0000

Category:

Applications

A cosmetic surgery OEM was experiencing challenges with the valves in their monopolar RF equipment. To address the issue, �ǳ�web developed a custom electronic valve with high-performance seals to meet the specific needs of the OEM's unique application.

Problem:

Valve leak issues undermine performance in OEM's monopolar RF equipment

An OEM of monopolar RF equipment for collagen regeneration required a specialized valve capable of withstanding high pressures and preventing refrigerant leakage. The existing valves were unable to maintain a low leak seal under the elevated pressures necessary for the application, and standard valves were not compatible with the R-134 refrigerant media.

.............................................................................

Solution:

�ǳ�web develops custom valve to meet OEM's specific application needs

�ǳ�web developed a custom electronic valve that incorporated high-performance seals suitable for the media and was specially engineered to meet the performance requirements of the application's high-pressure conditions. In this application, RF energy is transmitted to penetrate the skin, heating cells to promote new growth and improve elasticity, thereby restoring skin vitality. The valve precisely controls the flow of refrigerant media to cool the skin during this process, preventing surface burns. By collaborating closely with the OEM, �ǳ�web ensured that the valve achieved ultra-low leak rates and compatibility with noise and power requirements, providing a reliable solution that enhanced the equipment's performance.

Request a Custom Solution

Related Products
Custom Solutions	DR-2 Series Precision Regulator	ES Series Electronic Valve

Tags:

DR-2

Custom Solutions

custom

DNA Sequencing

Rachel Desenberg — Wed, 13 Oct 2021 19:58:55 +0000

Category:

Applications

Did you know? �ǳ�web products are used in DNA sequencing to help enable early detection of diseases and better, more advanced treatments.

Related Products
Cordis High Resolution Proportional Controls	EV Series Electronic Valves	Eclipse Proportional Isolation Valves	NIV Series PTFE Media Isolation Valves

Tags:

CPC

eclipse

NIV

What Is a Bidirectional Valve?

Rachel Desenberg — Thu, 07 Oct 2021 14:20:47 +0000

Category:

Videos

In this quick video, Mike Kettering, �ǳ�web's Electronic Valves Product Manager, discusses what a bidirectional valve is and how it might be beneficial for your application.

Video filmed at �ǳ�web in Cincinnati, Ohio

VIDEO TRANSCRIPT:

Hi, I’m Mike Kettering, Product Manager for Electronic Valves at �ǳ�web. What is a bidirectional valve, and why would I want one? A bidirectional valve is simply a valve that’s rated to function from inlet to outlet, or outlet to inlet. It’s like you don’t even need to label “outlet” or “inlet.” The main benefit of using a bidirectional valve is the ability to control flows and pressures in both directions.

All pneumatic applications with valves are dynamic. Confidence that your valve will function in any state within the system pressures is important. Since the valve functions in both directions, the inlet and the outlet can be swapped with little to no effect on the application. This can be a key feature in isolating pressures.

Let me give you an example. My fingers can be a pinch valve… When I blew this balloon up, I had to open my fingers—the pinch valve—to put air into the balloon. With my fingers closed, the air is trapped in the balloon. When I open my fingers, the air can come out. A pinch valve is bidirectional.

�ǳ�web offers bidirectional valves in the EV and ES series which utilize �ǳ�web’s spectacular spider technology. These valves can have vacuum or pressure applied to any of the ports.

In some applications, bidirectional valves may be required for safety reasons. It is very common for bidirectional valves to be required any time that pressure is isolated. For example, a fill and bleed application, or an electronic pressure regulator.

If a typical directional control valve were used in one of these applications, it could allow that pressure to backfeed towards the supply, which could result in a leak or reduced flow rate.

I hope this video is helpful. Thanks for watching. Don’t forget to subscribe to our YouTube channel, and have a great day.

Tags:

bidirectional

Analytical Series Valves: A Video Overview

Rachel Desenberg — Fri, 19 Mar 2021 21:06:28 +0000

Category:

Videos

Learn more about �ǳ�web’s analytical series electronic valves in this product overview video from Mike Kettering.

Video filmed at �ǳ�web in Cincinnati, Ohio

VIDEO TRANSCRIPT:

Hi there, I’m Mike Kettering, product manager for electronic valves here at �ǳ�web. Today, I’d like to talk about our A- or analytical series valve and how it can benefit your application. Any application where cleanliness, leak resistance, and cycle life is important is a good potential application for the analytical series valve. We’ve had a lot of success with life science, medical, and leak testing applications.

Some things that set the analytical series apart are, the cross-section of the o-rings—we’ve increased the cross section of the o-rings in this valve to increase the leak resistance. This valve also has a one-piece base—we have eliminated a few potential leak points on the base. All these valves are cleaned and assembled in a clean room which helps prevent any kind of contamination from getting into the valve.

All the elastomers are baked before assembly. This is important for any application where outgassing is a factor—we go ahead and outgas those seals on the front end so it’s not an issue in the application. Another thing with outgassing is there’s no anaerobic sealants used in the assembly of the valve.

These valves come standard in 12 and 24 VDC. There’s a few different electrical connections we can do, including wire leads and spade terminals. There’s a lot we can do custom for this valve including different voltages, higher pressure ranges, and different flow ranges.

For more information, please visit our website, and don’t forget to subscribe to our YouTube channel. Thanks, and have a great day.

Related Products
Analytical Series Electronic Valves

Related Content

Video: How a Basic Leak Decay Tester Works

Tags:

How to Select Electronic Directional Control Valves

Rachel Desenberg — Tue, 18 Sep 2018 15:35:22 +0000

Category:

Troubleshooting

Selecting the appropriate valve for any application is imperative to ensure proper direction of flow, flow rate, exhaust function, and even basic valve functionality.

Valve Function

Valve function outlines the number of flow paths a valve has as well as the positions of a valve. The flow paths or ports are referred to as ways in the valve function. The number of positions is how many different positions that valve can be in.

2/2 Valves

A 2-way 2 position valve is known as a 2/2 valve. A basic example of a 2/2 valve is a ball valve. A basic ball valve has two ports (in and out) along with two positions (open or closed).

3/2 Valves

A 3-way 2 position valve is known as a 3/2 valve. A basic example of a 3/2 valve is a pilot valve like the E310A-1W012 10 mm valve from �ǳ�web. A pilot valve is used to send a pressure signal when actuated and exhaust that signal when de-actuated. This valve has 3 ways (in or supply, output, and exhaust) along with 2 positions (closed—pressure blocked with the outlet vented to atmosphere, or open—pressure connected to outlet and the exhaust blocked).

4/2 Valves

A 4-way 2 position valve is known as a 4/2. These valves are common in double acting cylinder applications where they are always supplying pressure to one side of the cylinder while venting the opposite side to atmosphere.

5/2 Valves

A 5-way valve is essentially the same function as a 4/2, but with the added benefit of independent exhaust paths for each output port. This is most commonly not referred to as a 5-way, but a fully ported four way valve. This allows the designer to have specific controls on the exhaust paths for either the extend and the retract exhaust paths. Some manufacturers do not reference 5/2 or 4/2 when offering a 4-way valve and although the differences are subtle, it may be import to your specific application.

6/2 Valves

Less common but still needed in specific applications, the 6-way valve is similar to having two 3-way valves mechanically tied within a single valve. Applications that require fail safe feature that assure that both valves will actuate at the same time are ideal for this function.

3 Position Valves

Some valves may have 3 positions in their function, which allows all ports to be blocked or open to atmosphere. These can be electronic valves or manual control valves that are spring centered with no power. These valves are not very common and are used for specific applications to either lock in a specific position of a cylinder or to open paths to atmosphere allowing the cylinder to be mechanically or manually positioned.

Valve Porting

Valve Porting pertains to the usability of the port and the direction of flow through the valve in different positions. There are two key points we will cover. First, the usage of the port—can we physically connect to the port? And second, the flow direction that the valve must accommodate for the application.

Fully Ported

A "fully ported" valve is any valve that you can physically capture or plumb to all the ports. This does not mean that all the ports are necessarily threaded, but this does mean that the flow path can be captured via a specific method opposed to a vent hole that goes to atmosphere.

Fully ported valves are ideal for applications where the media needs to be plumbed, for example: in clean rooms where all gases must be vented external to the room. �ǳ�web's ET-2-12 with threads on the inlet port and threads on the outlet port could be referred to as fully ported since all the ports on the valve can be plumbed, but the ET-3-12 is not fully ported as the exhaust path is vented through small holes in the valves cap. Hence �ǳ�web's offering of the ETO-3-12 fully ported version of the ET-3-12.

It is important to note that "fully ported" does not specify that all ports can be pressurized, only that they can be ported.

Bi-Directional

A bi-directional valve is a 2/2 valve that is not sensitive to which port is the inlet or the outlet. In Europe this is referred to as a bi-stable valve. Bi-directional valves are necessary for demanding applications where the higher pressure differential could be on either the inlet or the outlet.

A common ball valve is a simple example of a valve that doesn't care what side the pressure is coming from and works in either direction. This valve would be known as bi-directional.

The opposite valve to this would be a check valve, which flows in a single direction only.

Universally Ported

What about the possibility of a valve with more than two ports that is fully ported and bi-directional? This would be a universally ported valve. A 3-way universally ported valve can be configured for six functions, such as: 3/2 normally-closed, 3/2 normally-open, 2/2 normally-closed, 2/2 normally-open, selector, or even diverter.

It is important to note that not all fully ported 3/2 valves are universally ported.

Electronic Valve Actuation Types

The actuation is what shifts the valve from one position to another and there are two popular types that need to be considered in selecting the proper valve for any application. The actuation can be any of the functions or porting discussed above and is another valve characteristic that is important to understand.

Direct Acting

Direct acting valves are simple in design since the actuation of the valve directly translates into the change of the position. This is typically achieved by moving the valve element via a magnetic coil. All of the �ǳ�web EV Series valves are direct acting since energizing the coil directly lifts the spider (a flat armature spring) to change the flow state. The benefits of direct acting valves are that they have no minimum pressure requirements, fast response time, and long life due to few moving parts. The lack of pressure requirements makes the valve design ideal for universally ported functions. �ǳ�web's EVO-3-12 is a great example of a universally ported valve. The EVO-3-12 can be used with 80 psig on the normally-open inlet port, vacuum on the normally-open exhaust and select between them for an output.

Pressure Assisted

Pressure assisted valves are the most common valves used in automation applications. They rely on the pressure supplied to the valve to assist with actuation. The amount of force available from pressurized air to shift a valve is far greater than the force that can be generated from a magnetic coil on a direct acting valve with similar flow and pressure ratings. Once the internal pilot valve opens the pressure will assist the valve in shifting. This allows the ports to open and the valve to flow at high flow and/or pressures.

The benefit of pressure assisted valves is that they can take little electrical power because they are using the power of pressurized media. This allows for a smaller overall size for the given flow rates and port size. The drawbacks can be that they require a minimum pressure and don't allow universal porting options unless the pilot pressure is from an external force.

Pressure assisted valves are generally engineered for specific applications to achieve the maximum flow and pressure ranges while using the smallest amount of electrical power possible. Other pressure assisted valves that do not have internal pilots are balanced and tuned so that pressure works in conjunction with spring forces and the coil to lift the seat and allow for flow. An example of a pressure assisted valve is the �ǳ�web Maximatic MME-41PES-D012. Energizing the coil on the MME-41PES-D012 applies pressure to a piston to shift the spool in the valve.

For help selecting the best valve for your application, call 877-245-6247 or contact your local distributor.

By Mike Kettering • Technical Sales Specialist • �ǳ�web

Tags:

10 mm

15 mm

Maximatic

Pneumatic Solutions for Leak Testing

Rachel Desenberg — Mon, 24 Mar 2014 14:54:19 +0000

Category:

Applications

A leak is defined as an unintended passageway that enables fluid to escape plumbing, a component or a system. There are a number of methods used to detect leaks such as pressure decay, mass flow, bubble, sniffing and vacuum.

pressure decay technology

�ǳ�web utilizes pressure decay technology, and integrates automatic leak testing circuitry into our assembly equipment. We use our EV/ET, DV and EM series electronic valves to fill and hold pressure because they are bubble tight, do not generate heat, and have a billion cycle life expectancy.

The Analytical Series has been designed specifically to reduce and limit potential leak paths within the valve.

reliability & accuracy

For reliable, accurate leak test equipment designs, �ǳ�web provides:

• High flow valves capable of filling large volumes quickly

• Built-in pneumatic circuits that automatically switch leak
tests from one side of a part to another

• Optimized systems for multiple test pressure
requirements, etc.

• Custom assemblies including valves, cylinders,
regulators, fittings and more.

�ǳ�web’s miniature valves, actuators, fittings and regulators are ideal for these types of applications.

�ǳ�web Two-Stage System
for High & Low testing

�ǳ�web Electronic Valves feature:

• Billions of life cycles
• Industry standard for leak-free operation
• Flow rates to 100 l/min @ 100 psig
• Fast response and low power
• Low heat rise
• Quiet operation
• Multiple seal options

�ǳ�web has a long history of successfully partnering with progressive companies in the design and development of innovative pneumatic solutions for both portable and stationary leak detection equipment.

How can �ǳ�web’s engineering and application expertise assist in the development of efficient, compact pneumatic assemblies for your next leak test application?

Contact �ǳ�web
Locate a Distributor
Download Whitepaper (PDF)

Relevant Product Lines:
DV Series High Flow Electronic Valves	MAV Control Valves	EM Stud Mount Electronic Valves	Hose Barb Fittings

EV/ET/EC/EW Electronic Valves	Analytical Series Electronic Valves	Hose & Tubing

Tags:

Pneumatic Solutions

Leak Testing

decay

Fill & Bleed Applications

Rachel Desenberg — Tue, 05 Mar 2013 15:41:55 +0000

Category:

Applications

A Fill and Bleed Circuit
is combination of pneumatic valve components used to inflate a volume or apparatus in one controllable function and to release or vent pressure in a second controllable function.

Fill and Bleed Circuits are commonly used in many applications where a particular pressure, firmness or position can be controlled with the addition or venting of pressure.

Three Typical Examples of Fill and Bleed Applications

Pressure control systems typically use a fill and bleed type circuit to add or subtract air in maintaining pressure. They can also be referred to as E/P or Electronic Pressure Control when feedback is provided to read the downstream or output pressure and looped back to tell a PLC or System to fill or bleed more pressure. These can be tremendously accurate depending on the speed and orifice of the valves used in the circuit and the accuracy of a pressure transducer. �ǳ�web EV valves are commonly used in these applications in analytical and instrumentation equipment, medical devices such as blood pressure cuffs, and pressure control industrial applications.	In lumbar support applications, pressure would be better defined as firmness, where a pneumatic fill and bleed circuit is controlling the air pressure in a flexible bladder built into a seat. Massage or therapy chairs use multiple bladders filling and bleeding pressure that changes the firmness in a sequential pattern massaging the user. These applications can be found in first-class airline seats, train seats, truck or mobile cabs where the operator is sitting for extended periods of time.	Position is based on the same principle when applying a fill and bleed circuit along with the basic cylinder formula of ^{PRESSURE X AREA = FORCE} and linear spring force. Using s single acting cylinder, the linear spring force on the cylinder needs to be overcome with a particular pressure in order to move. As the cylinder moves, the force required to push against the spring force changes, therefore varying the pressure can simply vary the position. For example, if a cylinder was used to move the position of a table up or down, a fill and bleed circuit can be applied to the bottom of the cylinder to adjust pressure, which in turn changes the position.

The components can be quite simple and robust, such as the FBV manual fill and bleed valves. Or, for integration with electronic controls, a combination of electronics valves can achieve very simple or more complex circuit for your fill and bleed applications. �ǳ�web has made hundreds of different fill and bleed circuits for many different application and industries. Contact us today for assistance with circuit design, sub-assemblies quotes, or just to chat.

Related Products:
EFB Series Fill & Bleed Circuits	FBV Series Fill & Bleed Valve

Tags:

Electronic Valve Series Flow Chart

Rachel Desenberg — Tue, 08 Jan 2013 16:22:36 +0000

Category:

Product Information

�ǳ�web Electronic Valve Series Flow Chart

Note: Add "A-" prefix to any �ǳ�web EC, ET, EV or EW standard series electronic valves where an Analytical version is available.
(Example: A-ET-2-12-L)

Click here for more information on �ǳ�web Electronic Valves

Electrical Specifications
Nominal				Power (watts)	Working Range (cont. duty)
Series	Voltage	Current (amps)	Resistance (ohms)
• Standard • Oxygen Clean • Analytical	6	0.11	54	0.67	90 to 150% of rated voltage
	12	0.055	218
	24	0.028	864
• Corrosion-Resistant	12	0.098	122	1.2	90 to 110% of rated voltage
	24	0.049	486
• EM Series • ES Series	12	0.083	144	1.0	90 to 120% of rated voltage
	24	0.042	576

Tags:

electronic valve

�ǳ�web Analytical Series Electronic Valves

Chris Agricola — Wed, 19 Dec 2012 13:25:33 +0000

Category:

Product Information

�ǳ�web Analytical Series Electronic Valves

�ǳ�web Minimatic electronic valves are precision-built 2-way or 3-way control valves, utilizing a unique, patented valving principle. There are no sliding parts. Complete poppet travel is a mere 0.007”. As a result, low power consumption, quiet operation, low leak and exceptionally long life are major benefits of this design.

The Analytical Series Valve (A-) combines the proven features of �ǳ�web’s “Mouse” series with the specific needs of the analytical industry, and for applications where cleanliness is especially important. Special materials, manufacturing and assembly processes make this valve perfectly-suited for applications where internal cleanliness, bubble-tight operation, and long life are imperative.

Medium: Clean, dry air or non-corrosive gas (40 micron filter)
Wattage: 0.67 watt
Operating Temperature: 32 to 180°F (0 to 82°C)
Response: 5 to 10 milliseconds (nominal)
Operating Range: 90 to 150% of rated voltage
Voltage: 12 or 24 VDC
Mounting: Manifold only

Features
• Industry standard for leak-free operation
• 1,000,000,000 cycles
• Design flexibility and fast response
• Low heat rise/low power
• Enhanced cleaning procedures

View Product Brochure
Request Full-Line Catalog
View Cleaning Specification
View Ordering Information

Tags:

A-E

Analytical