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HK5/HKL5 Miniature Diaphragm Poppet Valve Offers Practical Solution for Alternate Media Application

HK5/HKL5 Miniature Diaphragm Poppet Valve The unique construction of the direct-acting HK5 solenoid valve makes it ideal for use in precise applications for clean, dry air, alternate media, and inert operation.

The miniature diaphragm poppet design flexes as it shifts, eliminating the need for sliding seals, seal wear, and metal-on-metal contact. This design ensures media integrity over a long service life.

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Solenoid Valves Offer Application Flexibility

The HK5 and HKL5 diaphragm valve series is a compact, flexible solution for controlling gases and fluids. Its multipurpose function and flexible construction make the solenoid valve series user-friendly. The design can offer zero leakage in specific applications. The HKL5 model is designed for compatible liquids and gases found in analytical instrument applications. Download the brochure for more information.

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HK5 and HKL5 Miniature Solenoid Valve Features

The Humphrey HK5 Series 2-way & 3-way, single solenoid valve provides performance and versatility for multi-media applications.

Product advantages:

  • Diaphragm-poppet design is inert to media
  • Versatile plumbing, electrical, and mounting features
  • Quiet operation 
  • Multi-function: 2-way or 3-way, normally closed or normally open, diverter or selector 
  • Excellent flow characteristics for a small, light, compact component: 85 LPM at 100 psi
  • Direct operating: stable performance throughout the spectrum of 28” Hg to 100 psi
  • Multi-million life cycle
  • RoHS compliant
  • Made in the USA

Application advantages:

  • Media is isolated from the solenoid
  • All wetted surfaces are inert materials
  • Low leakage with bubble-tight applications available


A Track Record of High-Quality Solenoid Valve Applications

Humphrey’s HK5/HKL5 Miniature Diaphragm-Poppet Valve has years of experience with difficult applications. Several Engineered Solution designs have been developed and centered around the flexibility and capabilities of the HK5.

Learn more with our case history illustrations of satisfied customer applications:

Optimize Your Equipment Performance with the Super Quick Exhaust Valve

Super Quick Exhaust Valve Applications, Benefits & Features

Our super quick exhaust valve is renowned for its responsiveness, extremely high flow capacity and long service life. This valve is designed to enhance the performance of corresponding pneumatic valves and cylinders.

Features of the Super Quick Exhaust Valve

  • Rugged, simple design
  • Engineered molded rubber shuttle
  • Long life cycle
  • Extremely high flow capacity
  • Quick dump of exhausting air for highspeed cycling
  • Versatile: function as quick exhaust, shuttle, check or speed controller

Super Quick Exhaust Valve Applications

This durable exhaust valve is well-suited for applications that require fast response times, precision pressure control and efficiency.

Exhaust valves can be used in:

  • Manufacturing equipment to manage the movement of robotic arms, conveyor belts and automated systems
  • Medical equipment that regulates the flow of air or provides oxygen delivery
  • Pneumatic systems that deal with compressed air to rapidly release pressure and control actuators, cylinders and other pneumatic components
  • Emergency stop systems to halt movement in machinery and help prevent accidents and injuries
  • Transportation systems to handle the movement of doors and other components

Benefits of Using a Super Quick Exhaust Valve

Improved response times: Systems can respond faster to changes in input because this valve allows compressed air or gas out rapidly. That’s important in applications where speed is critical, such as manufacturing and automation.

Improved efficiency: A super quick exhaust valve reduces energy consumption and operating costs by releasing pressure promptly and efficiently. It also prevents pressure buildup, which may damage equipment and cause safety hazards.

Improved Control of Media: A super quick exhaust valve incorporated in system design can sense pressure differential and respond immediately with controlled redirected flow.

Longer lifespan: The efficiency of a super quick exhaust valve is designed to drop pressure immediately to reduce wear and tear on system components, extending the lifespan of the system as a whole.

Increased safety: Emergency stop systems and safety controls require fast response times. Use of a super quick exhaust valve can de-energize system immediately minimizing risk of risk of accidents, equipment damage and injuries.

Contact a member of the Humphrey Products team to learn more about our quick exhaust valves.

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Silver and 3-port super quick exhaust valves by Humphrey Products

What’s the Right Elastomer for Your Application?

Fluoroelastomer (FKM) vs Perfluoroelastomer (FFKM)

Fluorinated, carbon-based synthetic rubber materials, known as fluoroelastomer or FKM, emerged as a popular choice for high-performance seals in the late 1950s. Those materials can withstand temperatures greater than 200°C and are still used to manufacture O-rings, seals and gaskets for automotive, aerospace, energy and other industries.

In the 1970s, DuPont™ introduced Kalrez®, a perfluoroelastomer or FFKM compound, as the gold standard elastomer for high-performance seals in aggressive media environments. FFKM has since been enhanced for even greater performance and is more widely available.

What is a Perfluoroelastomer?

FFKM has a fluorinated backbone and higher fluorine content than the FKM compound, which allows for greater material elasticity. It also has a higher temperature rating of up to 325°C. FFKM has a nearly universal chemical compatibility, making it an ideal choice for challenging applications.

Advantages of a Perfluoroelastomer

Due to its superior inert properties, FFKM resists volume swell when exposed to more than 1,800 chemicals, solvents and plasmas. FFKM can also withstand the harshest conditions, including those found in medical applications where aggressive agents and steam are used for sterilization and semiconductor manufacturing where oxygen plasma is present.

Because of those advantages, FFKM parts are a viable choice for chemical processing, aerospace, oil and gas exploration, paint and ink production, water and irrigation, life science, medical, and food manufacturing and processing applications.

FKM & FFKM Elastomers Available at Humphrey Products

Humphrey Products has offered FKM as a temperature and chemical compatibility sealing option on their industrial and specialty valves for many years. 

Today, Humphrey offers an FFKM diaphragm option for our 350 Series 2-port and 370 Series 3-port iDP aggressive media solenoid valves. We’ve paired the FFKM diaphragm option with our inert Radel® body material to ensure our iDP valves can safely control the most difficult liquid and gas media, including reagents, chemicals, cleaners, and even steam.

Trust the long-term, proven performance of FFKM parts to reduce the frequency of seal changes, lower inspection and repair costs, improve equipment uptime and increase productivity and yield.

For more information, contact Humphrey Products online or call 1.800.477.8707.

iDP Diaphragm Isolation Valves for Dialysis Treatment

Home hemodialysis continues to gain traction as an industry standard by providing the opportunity for more frequent treatments, possibly even while the patient sleeps, for a dramatically improved quality of life.

For over 20 years, dialysis equipment makers have chosen Humphrey Products' diaphragm isolation valves as an effective and dependable fluid control solution. Today, they are the obvious choice of equipment meant for the home.


iDP Kidney Dialysis Valve Features

Constructed simply for reliability and with a variety of materials compatible for water purification, pH level control and cleaning fluids, Humphrey iDP kidney dialysis valves are offered in 2- or 3-port solenoid valves and either digital or proportional control.

Fluid temperature, flow capacity and maximum pressure ratings have been optimized for dialysis treatment, and the diaphragm isolation valve operator is encapsulated to perform in dry or humid environments.


How iDP Valve Modifications Improve Performance

Additional features for our diaphragm isolation valve meet the demands of more diverse dialysis applications.

New features include:

  • FFKM elastomer for high-temperature compatibility, including steam
  • Compact manifold mount type for overall space savings in equipment
  • Stepper-operated proportional valve for precision variable flow control of fluids
  • High-pressure option can control fluid media up to 80 psi

New attributes to iDP valves were developed to meet various hemodialysis requirements and have given us a high market share in the industry.


Humphrey iDP Valves Boost Home Hemodialysis

The Humphrey iDP kidney dialysis valves have contributed to the success of new equipment targeted specifically for home hemodialysis.  Their selection was based on a proven history of performance and reliability in dialysis equipment.

Recent features added to the iDP kidney dialysis valve series were a direct result of the needs of equipment for the home to improve patient independence and overall quality of life.

Call 1.800.477.8707 or contact us online for more information on our iDP kidney dialysis valves.

Diverse Solenoid Valve Applications

Humphrey Products has specialized in making direct-acting pneumatic solenoid valves for more than 60 years. Our Balanced Solenoid Valve Series offer universal functionality for various solenoid valve applications, thanks to compact sizes and flexible designs.


Balanced Solenoid Valve Features

Our Balanced Valve Series includes several models that have:

  • Multi-purpose piping: pipe any valve for vacuum, low or high pressure, and as normally closed or open, diverter or selector
  • 2-, 3- and 4-port solenoid valve configurations
  • Individual valve or manifold mount models
  • 15-, 19- and 25-mm sizes (1/8, 1/4 and 3/8 pipe ports)
  • Excellent flow capacity
  • Industry low leak rates
  • Environmentally protected models (IP67 ingress protection)


Benefits of Using Humphrey’s Balanced Solenoid Valves

Developed with equipment makers in mind, the Balanced Valve Series’ design is simple, reliable and cost-effective.  The flexible, direct-acting pressure-balanced construction makes each valve ideal for a long cycle life in a variety of applications.

Watch our video for a detailed analysis, and contact us to learn more about our products.

Humphrey Products to Showcase Medtech Valves at MD&M West 2023

The Humphrey Products team will be in Anaheim, California at the MD&M West 2023 medtech conference from February 7-9, 2023. Medical design manufacturers, innovators and industry leaders will come together to learn about new technology, build relationships and network.

Humphrey Products will join hundreds of other industry experts, engineers and thought leaders to highlight our innovative proportional and solenoid valve solutions. We will be at booth 1525 for the duration of the trade show.

We will showcase liquid handling and valve applications, including our:

The team looks forward to making new professional connections and continuing to build existing partnerships to better serve our customers. Add us to your Show Planner online here.

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


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.


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

Humphrey Products to Attend COMPAMED 2022

Humphrey Products has built its reputation on a wide assortment of custom valve solutions for media-handling components and valves in the medical industry. The team will feature those applications at COMPAMED 2022 in Düsseldorf, Germany, from November 14 to 17.

Humphrey Products will host a display in Hall 8B, booth G20-1, to showcase its liquid handling and valve applications. The product lineup will include:

The team will also debut MiDP, the new stepper motor-driven proportional valve developed to precisely control the delivery of aggressive chemicals and reagents.

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

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.

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.

Using Humphrey Products Online Catalog for Distributors

Our online product catalog is designed to cater to the needs of design engineers, technical buyers and Humphrey distributors. We’ve created a tutorial explaining how to browse our pneumatic and solenoid valve selection.

Two Search Methods

  1. Use the search field in the upper left corner of our web pages to find a specific product based on its model number or Humphrey valve series. The product should appear in the search results for you to view product details.
  2. Select the Products tab from the upper ribbon. A product features menu will appear on the left side of the screen, where you can search by broad category or specific valve attributes. It’s best to start from the top of the menu and work your way down. The search results will refresh with each feature selection.

Product Line Selection

This online catalog section is located at the bottom of the left-hand menu and is intended for Humphrey distributors. It provides introductory material on products and links to our online brochure and product videos. As you narrow your search, you can select and compare different valves to learn about their advantages.

Product Detail Pages

Each product page includes an image of the valve, the series and the model number. You’ll find the product description, specifications, downloadable PDFs and technical sheets.

Product pages include application examples for each valve and links to accessories and related products. View or download a CAD model or 2D drawing, which are good resources for clients.

Each valve’s list price and availability are refreshed daily, so you can provide your clients with up-to-date pricing information.

Humphrey distributors can also use the HSIS login at the bottom of any web page to access additional products and lead times information that isn’t available to the public.

Watch our video tutorial for a complete walk-through of our online catalog, and contact us for product information.

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

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.

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