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Learn About Our ProControl Proportional Solenoid Valves

Humphrey ProControl Proportional Solenoid Valves offer a wide variety of pressure opportunities for pneumatic applications. These proportional solenoid valves deliver variable control of compressed air or inert gases based on the corresponding input current to the coil.

Types of Proportional Solenoid Valves

Humphrey offers five different types of flow capacity:

  • Mini PV3 and PV10 solenoid valves: These valves offer precise control in confined spaces, cost-effectively. They deliver 0-32 and 0-75 LPM, respectively.
  • PC30 solenoid valves: Mid-size valves with additional flow capacity ranging from 0-225 LPM.
  • Servoid series: These valves are extremely precise and are excellent for various low-pressure settings. They deliver 0-200 LPM.
  • Balanced servoid: Stable performance regardless of upstream pressure changes. This solenoid valve is the industry standard for biomedical critical care patient ventilators.

Control Output Flow Options

Proportional solenoid valves can be used in medical, analytical, instrumentation, test, measurement, factory automation and process control applications.

These valves come with three types of flow options:

  • Selectable: Delivers unique output flow within each cycle.
  • Incremental: Adjusts flow at a predetermined amount within each cycle.
  • Dynamic: Responds continuously to downstream demands.

Proportional Valve Driver

Proportional valve drivers are intended for valves that run on one amp or less, regardless of the valve manufacturer. You can conveniently test, evaluate and use proportional valves with a proportional valve driver in real-time.

Check out our video breakdown for more information. Contact us to learn more about our products.

Breaking Down Proportional Solenoid Valves

Humphrey ProControl™ Proportional Solenoid Valves are an excellent option for pneumatic applications that require variable or controlled valve output flow.

Proportional Solenoid Valves - How They Work

Proportional valves are small two-port, normally closed, direct-acting solenoid valves. They respond precisely to the amount of input current applied to its solenoid. From a stabilized upstream pressure source, customers can expect precise and consistent variable output flow performance for millions of cycles. Output flow adjusts precisely to minor changes in input current.

Proportional valves can enhance pneumatic system performance with soft starts, precision stops, and reduced shock during operation. In closed-loop systems, proportional valves will deliver precise flow control and instantaneous response, even with minute adjustments from input sensors.

The ProControl™ Offering

Today, Humphrey offers three standard valve models and two customizable valve platforms from our Engineered Solutions group. Standard models:

Modifications to standard valves are possible and welcomed. Humphrey can optimize valve performance with an understanding of OEM customer requirements. Contact procontrolway@humphrey-products.com.

The ProControl™ Servoid Series are tailored to specific customer requirements. Featuring very high flow from a low supply pressure source, the Servoid Series can deliver extremely precise and linear output flow with low hysteresis and high-resolution characteristics.

Proportional Solenoid Valve Drivers

Most OEM customers drive proportional valves from their onboard PCB. For others, Valve Drivers are available and are used to take input signals sourced from sensors and deliver appropriate output current to operate the solenoid. Customers use drivers to test, evaluate and use proportional valves on benchtops or in proportional valve projects. Humphrey offers it’s driver with the ProControl™ PCD.

Advantages of Proportional Solenoid Valves

  • Consistent operation without voltage changes
  • Tight seal at rest
  • Low hysteresis
  • Low power consumption
  • Excellent resolution
  • Compact construction

Check out our video breakdown for more information. Contact us to learn more about our products.

Discover Medical Technology Innovations at MD&M West 2022

Innovation doesn’t happen in a vacuum. For nearly 40 years, serious professionals from all over the world have come to MD&M West – the largest MedTech event in North America – to find the technology, information, and resources to build life-changing medical devices.

Humphrey Products “wouldn’t miss it,” says technical product manager Deron Kaczorowski. The company’s experience in the miniaturization of valves and subsystems for liquid, vacuum, low- and high-pressure applications is particularly important in medical device manufacturing.

But new medical device innovations often need new component technology to ensure optimum performance, so MD&M West is more a “meeting of minds” than a tradeshow, said Mike Hammond, director of product management. “Every year, we meet people designing the future of medicine and get to talk through the challenges they’re facing.”

These conversations are exciting for Humphrey Products, which has an entire division devoted to the design and manufacture of custom valves and valve systems for the MedTech industry. In the last half-century, Humphrey Products’ Life Science Group has worked side-by-side with medical device designers and engineers from the pre-prototype phase through production and field testing to develop components for respiratory equipment, dialysis machines, automated slide stainers and more. They even developed a product to pilot the pumping of the first artificial heart.

For a company with innovation in its blood, the annual MD&M West expo is a must-attend event, indeed.

Meet the Humphrey Products team at the Medical Design & Manufacturing conference at the Anaheim Convention Center from April 12-14, 2022. Stop by booth 2891 to explore new products and weigh in on new valve concepts.

ABOUT HUMPHREY PRODUCTS
Humphrey is recognized as a leading producer of pneumatic and liquid control products, serving organizations worldwide. With expertise in a wide range of industries and proven valve technology, the company is able to engineer unique solutions for medical applications, analytical equipment, commercial and industrial operations, and more.

ABOUT MD&M West
MD&M West brings together MedTech engineers, business leaders, disruptive companies, and innovative thinkers to create powerful solutions and life-changing medical devices.

Industrial Design & Manufacturing Company Humphrey Products to Host Job Fair in Kalamazoo

Humphrey Products continues its recruiting efforts as the company hosts another job fair on Tuesday, October 12, 2021. The event will be held from 2 p.m. to 6 p.m. at Humphrey’s headquarters at 5070 East N Avenue in Kalamazoo.

Representatives from the Humphrey Products Human Resources team will speak with prospective candidates and take applications for all open positions, including:

  • Assembly
  • Buyer
  • Design Engineer
  • Machinist
  • Master Production Scheduler
  • Sales Engineer
  • Mechanical Engineer Product Design Intern

This is the growing company’s second job fair in recent months. “Our September job fair was very fruitful,” says human resources manager Laura Oliver. “We have so much talent in this area, and hosting these events ourselves gives us an opportunity to spend more one-on-one time with candidates and find the right fit for their skills.”

An industry leader in the design and manufacturing of pneumatic and liquid control products, Humphrey Products offers competitive salaries and incentive programs for every position. The dynamic team values an open exchange of ideas, innovation and collaboration, making it a rewarding place to work.

For more information about the upcoming job fair, please call 269.216.5145 or email loliver@humphrey-products.com.

ABOUT HUMPHREY PRODUCTS
Humphrey is recognized as a leading producer of pneumatic and liquid control products, serving organizations worldwide. Our expertise in a wide range of industries is based on technologies proven in our range of solenoid valve and specialty valve products, enabling us to engineer unique solutions for medical, analytical, test and measurement, commercial and industrial applications.

Humphrey Products to Attend COMPAMED 2021

Humphrey Products built its reputation on a wide assortment of engineered solutions for media-handling components and valves in the medical industry, and the team is excited to showcase those applications at the 2021 COMPAMED international trade fair in Düsseldorf, Germany, from November 15 to 18.

COMPAMED is a melting-pot for high-tech medical solutions where medical manufacturers and suppliers meet with heads of research and development, production managers, engineers and technicians to discover diverse MedTech solutions.

The trade show features products including:

  • Manufactured products and parts
  • Services
  • Digital technology
  • Microtechnology
  • Raw materials
  • Adhesives

Humphrey Products will host a display in Hall 14, section D24, to showcase our liquid-handling and valve applications. We will also meet with OEM manufacturers, process and design engineers and technology procurement managers to build working relationships with companies around the world.

The product lineup will include:

Call 1-800-477-8707 or contact us online for product and service information.

ABOUT HUMPHREY PRODUCTS
Humphrey is recognized as a leading producer of pneumatic and liquid control products, serving organizations worldwide. Our expertise in a wide range of industries is based on technologies proven in our range of solenoid valve and specialty valve products, enabling us to engineer unique solutions for medical, analytical, test and measurement, commercial and industrial applications.

Headquartered in Kalamazoo, Michigan, we have an experienced staff of more than 200 employees. We serve customers globally through a network of authorized distributors located around the world.

ABOUT COMPAMED
COMPAMED is the leading international trade fair for the supplier market and medical manufacturing. The fair is geared toward focusing on diversity to shape the future of medical technology. It also serves as a hub where medical professionals and manufacturers can meet and network.

Selecting a Proportional Valve for Medical Devices

The unique characteristics and efficiency of proportional solenoid valves make them an excellent option for medical applications requiring precise electronic flow or pressure control.  These 2-port valves are available in a variety of sizes and pressure settings, and are designed for excellent repeatability and resolution with fast response to changes in the current applied to the solenoid. 

Breaking Down the Mechanics of Proportional Valves

Proportional valves are used to control pressure and flow. These devices produce a precise output in response to a controlled electronic input. They are coupled with flow or pressure sensors to provide precise flow rates or pressure settings. These are “closed loop” systems that use electronics to adjust the valve to meet exact requirements in both static and dynamic applications.

The solenoid receives input current (amperage) signals and uses the electromagnetic field of a coil to precisely move an armature, allowing the valve to correspondingly adjust it’s output flow. That allows the user to precisely control downstream flow and pressure.

A pneumatic proportional valve can control several variables, including:

  • Force
  • Position
  • Temperature
  • Level

 

Humphrey Products ProControl Valve Series are used by clients to accomplish three kinds of variable output flow control:

  • Dynamic Control: Flow continuously adjusts within a single cycle (closed-loop responses)
  • Incremental Control: Predetermined changes within each cycle (ie reduce flow at cycle end)
  • Selectable Control: Prescribe an output flow that can vary from cycle to cycle, or job to job.

Finding a Proportional Valve

A proportional valve is a good fit for medical devices because it’s a simple and relatively inexpensive solution that produces precise flow or pressure in a variety of functions. When selecting a proportional valve for a medical device, consider the medium to be controlled first. Valve materials in the flow path must be compatible with the gas (O2, N2, CO2, air, etc).

Next, determine application parameters for the valve, such as:

  • Inlet pressure and maximum controlled output pressure
  • Required flow range
  • Media temperature and ambient temperature
  • Environmental factors, including location (hospital, clinical or portable), weight and space restrictions
  • Power consumption, especially for portable or mobile applications

Medical Device Valve Applications

Medical proportional valve applications include:

  • Anesthesia and ventilator gas mixing
  • Ventilator patient delivery for controlled breathing
  • Leak testing for medical components and packaging
  • Positive End-Expiratory Pressure (PEEP) control
  • Oxygen concentrators
  • Patient simulators
  • Clinical diagnostic equipment

View our proportional solenoid valve inventory, and give us a call at 844-447-9009 or email procontrolway@humphrey-products.com for Proportional Valve Application & Selection assistance.

Humphrey Products to be Employer of the Day at Michigan Works! in Kalamazoo

Humphrey Products will be the “Employer of the Day” at the Kalamazoo branch of Michigan Works! Southwest on Monday, August 30.

The event will take place at the Kalamazoo County Service Center, located at 1601 S. Burdick Street in Kalamazoo, from 1 p.m. to 4 p.m.

Representatives from the Humphrey Products Human Resources team will speak with prospective candidates and take applications for all open positions, including:

  • Assembly
  • Buyer
  • Design Engineer
  • Machinist
  • Master Production Scheduler
  • Sales Engineer
  • Mechanical Engineer Product Design Intern

An industry leader in the design and manufacturing of pneumatic and liquid control products, Humphrey Products offers competitive salaries and incentive programs for every position. The dynamic team values an open exchange of ideas, innovation and collaboration, making it a rewarding place to work.

“Employer of the Day” is an ongoing program hosted by Michigan Works!, the country’s first statewide unified workforce development system.

ABOUT HUMPHREY PRODUCTS

Humphrey is recognized as a leading producer of pneumatic and liquid control products, serving organizations worldwide. Our expertise in a wide range of industries is based on technologies proven in our range of solenoid valve and specialty valve products, enabling us to engineer unique solutions for medical, analytical, test and measurement, commercial and industrial applications.

ABOUT MICHIGAN WORKS!

Michigan Works! is the first statewide, unified workforce development system in the country. Every Michigan region is represented by public and private sector leaders who come together to share experiences and develop strategies to keep the state’s workforce strong and growing. The Michigan Works! Association provides services and support to Michigan’s workforce development system.

Humphrey Products Bringing Decades of Medical Device Manufacturing Expertise to MD&M West 2021

Kalamazoo, MI – Humphrey Products offers unique engineered solutions that are well-suited to the miniaturization of valves and subsystems for liquid, vacuum, low- and high-pressure pneumatic applications – especially for the medical device industry.

With more than 40 years of experience in tailoring valves to specific medical applications, the Humphrey team is well-versed in compliance regulations and can detect and mitigate potential problems in design and production. 
They’re committed to innovation in medical device component design and continue to develop products that reflect the ever-evolving technology in this industry.

Meet the Humphrey team at the Medical Design & Manufacturing conference at the Anaheim Convention Center from August 10 to August 12, 2021. Stop by booth 1839 to explore new products and weigh in on new valve concepts.

Humphrey will showcase its balanced ventilator valve case study, along with other Medtech products, including:

With decades of innovative experience, Humphrey Products has earned its reputation as a leading producer of pneumatic and liquid control products.
Call 1-800-477-8707 or contact them online for product and service information.

ABOUT HUMPHREY PRODUCTS
Humphrey is recognized as a leading producer of pneumatic and liquid control products, serving organizations worldwide. Our expertise in a wide range of industries is based on technologies proven in our range of solenoid valve and specialty valve products, enabling us to engineer unique solutions for medical, analytical, test and measurement, commercial and industrial applications.
Headquartered in Kalamazoo, Michigan, we have an experienced staff of more than 200 employees. We serve customers globally through a network of authorized distributors located around the world.

ABOUT MD&M West
MD&M West is where engineers and executives from across the globe converge before going on to change the lives of patients. In addition to the three-day conference covering Medtech, 3D printing, and smart manufacturing, the event offers the opportunity to meet suppliers and experts leading the charge to disrupt healthcare.

Choosing the Right Solenoid Valve for Your Application

There are plenty of variables to consider when selecting a solenoid valve for your fluid control application. Let’s take a look at some of the factors that come into play, and we’ll help narrow your search.

What does the solenoid valve need to accomplish?

Always begin with the valve “need”. What will the solenoid valve do in the application, both in the unactuated, at-rest state, and the actuated, coil-energized, state?  Examples:

  • Control an air cylinder (4-way valve)
  • Start or stop flow only (2-way)
  • Pilot a process valve (3-way)
  • Deliver variable flow (proportional) 

Determine what you need to do and what the timing requirements are. 

What media will the solenoid valve manage?

Your system’s pressurized fluid, whether gas or liquid, is another component to consider when determining the right valve for your application. Secondly, determine the expected minimum & maximum system pressure. It’s essential to find a valve design composition that will perform over an expected cycle life.  

The media’s chemical properties and temperature will dictate the valve’s compatibility. Incompatible valve materials will react to the media, degrade and fail prematurely. Degradation can be gradual, reducing cycle life, and requiring increased preventative maintenance or unexpected repairs.

Will there be more than one media for the application? Consider things like cleaning/flushing fluids, or the possibility of poor or water-ladened compressed air. Always plan for the most challenging media.

What size solenoid valve does the application require?

Properly sizing the flow capacity of the valve is next. Many manufacturers publish a flow rating (LPM, CFM, GPM) at the valve’s maximum pressure specification. Selecting an insufficiently sized valve will degrade system performance, or extend cycle times. It’s crucial to select a valve that can exceed the flow rate of your application, and when a minimum system pressure may exist.  Manufacturers usually provide an industry-accepted flow coefficient (Cv, Kv) that can be used to compare valve brands.

What operating conditions will the solenoid valve face?

Not all solenoid valves are used with clean dry compressed air, controlled precisely to 50 psig and within air conditioned, pristine work environments. Consider more than the most ideal conditions, and specify the valve around those parameters. This includes pressure fluctuations, quality of the media, temperature extremes and work environments.

Consider valve cycle rates and energized times to be expected of the valve, as performance and life of some brands can be affected. And finally, all valves can leak (extremely small amounts) of the media some brands more than others particularly as the valve wears over time. Take reasonable precautions and anticipate valve leakage.

A reliable valve manufacturing partner will help you find the right solenoid valve for any application. Call 800-477-8707 or contact Humphrey Products online, and we’ll get you started.
 

Basic Pneumatics - Pressure Control and Flow Control

Pressure control is the control of a fluid’s force within a vessel. It is transmitted equally in all directions. Think of your automobile’s tire pressure. When the pressure in all four tires is set properly, collectively they exert enough force (power) within, to safely support your automobile.

Flow control is controlling the movement of pressure between two vessels, and it moves from the vessel with greater pressure. When tire pressure is too high or too low, the tire valve is opened to release pressure from the tire “flowing” to the atmosphere or to receive a greater pressure “flowing” from the air compressor. Of course, a larger opening in the valve (or sadly, a tire blow-out) will flow the higher pressure quickly. 

Today, electronic sensor technology exists such that pressure and flow can be changed dynamically, in a close-looped microprocessor-based system. A simple example is today’s service station tire pump. Program your desired tire pressure and the pump shuts off when it senses 36 pounds of tire pressure.

Flow Control Valves

All valves control flow. The industry term Flow Control Valve refers to its ability to vary the flow of a fixed pressure to its output side. There are manually controlled and current (amperage) controlled valve types.

Manual Flow Control Valves usually have a knurled adjustment knob or throttle. Once the desired flow is set, these valves remain in that flow setting until further adjusted. 

Flow control valves operated by current are commonly referred to as proportional valves. As amperage is applied or varied to its solenoid operator, the output flow of the valve varies accordingly. 

The primary advantage of these “proportional valves” is their ability to be used with a microprocessor-based programmable controller, particularly in closed-loop systems. In these systems, downstream sensors continuously provide feedback to the controller to change (or not) the current to the valve’s solenoid operator.

Other names for flow control valves include needle valves, proportional valves, and meter out valves.

Pressure Control Valves

Pressure Control Valves are commonly called pressure regulators and come in manual and electronic models, similar to flow control valves. Pressure regulators are designed to respond and maintain a controlled downstream pressure setting when a pressure loss or surge occurs. Each pressure regulator has a restriction, load and reference element to respond to pressure and maintain the desired output.

They are only used in closed-loop systems since they require downstream feedback to maintain a set pressure. Pressure Regulators are offered with either piston or diaphragm type valves. Piston types are better suited to rugged applications that require some accuracy and durability, while diaphragms provide precision control.

Contact Humphrey Products online or call 800-477-8707 to learn more about our customizable valve solutions for fluid handling and pneumatic systems. 

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