Skip to main content

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.


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.


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.

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.

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. 

Air Piloted Valves 101 - The Basics

Air piloted valves make use of air pressure to control compressed air, liquids or gas by means of a pneumatic system. Manufacturers prefer these valves because they do not require additional electrical current or labor to operate. This proves especially useful in dirty, wet applications or when operating media in volatile environments could combust or change drastically in the presence of electricity. 

To understand air piloted valves better, we’ve compiled some basic information. We’ll be covering: 

  • What are air piloted valves? 
  • How do they work? 
  • What applications are they best suited for? 
  • What makes ours unique? 
  • What to do if you need custom air piloted valves for your system 
  • What Are Air Piloted Valves? 

Air piloted valves are operated with pneumatic pressure, and typically by the output of other pneumatic valves. They are configured as 2 and 3-port types to control pressurized liquids and gases such as water and chemicals, or as 2, 3 and 4-way types controlling compressed air (or vacuum) in industrial automation applications. 

Often, they contribute to simpler, more reliable and cost-effective solutions in media control problems, using smaller and/or fewer solenoid or manual piloting valves mounted away from the point of use.

They are commonly used in applications where the presence of electricity or manual labor may be hazardous. Additionally, air piloted valves are used in situations where an air pressure-based operating method is already in place. For example, outputs of other solenoid or manual valves can perform their work but also pilot operate these valves for simultaneous functions.

Other Terms for Air Piloted Valves

Some manufacturers and retailers may use these synonymous terms in place of “air piloted valves” to control liquids and gases in process applications for compressed air in pneumatic applications:

  • Air Operated Valves 
  • Remote Air Pilot Valves
  • Air Operated Slave Valves
  • Air Piloted Pneumatic Valves
  • Air Piloted Process Valves
  • Air Operated Pneumatic Valves
  • Air Operated Directional Control Valves
  • Pneumatically Operated Valves

How Do Air Piloted Valves Work? 

Air piloted valves use the force of compressed air on the effective area of a piston or diaphragm to shift into an actuated position. The manufacturer will specify a minimum pilot pressure requirement relative to the pressure being controlled.  

At Humphrey, we offer a variety of industry-standard and specialty function 2, 3, and 4-way air piloted valves for industrial pneumatic and low pressure, mild liquid applications. Our extremely reliable, diaphragm-poppet types are unique to industry with configurations for vacuum, dirty air, ultra clean air or mild liquids.

What Are Some Benefits of Air Piloted Valves? 

Air piloted valves can offer the following high-level benefits to end-users:

  • Cost savings: Require smaller, more efficient piloting valves, and utilize less compressed air when mounted near the point of use. Less expensive than solenoid and manually operated valves.
  • Reliable: Simple construction with few parts. High shifting forces and tight sealing. 
  • Safety: Reduces risk and more reliable when operating in hazardous or dirty environments. 
  • Amplified, high flow capacity: Excellent alternative when most flow requirements in the system are satisfied, but a few require amplified, high flow.

What Applications Are They Best Suited For?

Though not every type of valve will prove useful across all applications, air piloted valves are incredibly versatile. Some of the ways that they are used can include, but are not limited to:

  • Slave valves in simultaneous functions
  • Lockout valves in interlocking functions
  • Simple alternative when amplified, high flow capacity is required 
  • A safer alternative in hazardous or difficult environments 
  • Reliable in poor or unstable compressed air conditions 
  • Transitioning valves from lubricated, dirty air to clean dry air or alternate media
  • Consuming less compressed air than other solutions 

The Humphrey Difference

We design our products around our Classic Diaphragm-Poppet Series. This unique air piloted valve construction cannot stick and will not leak. 

Different from spool valves, diaphragm-poppet air piloted valves eliminate sliding seals that stick and wear with time. The design is also popular when “dirtier” system air needs to be isolated from clean, instrument quality air, or inert gas. 

Humphrey diaphragm-poppet air piloted valves are offered in optional brass and stainless steel bodies for use with gases and liquids as well as corrosive environments. This results in exceptional performance and reliability with certain alternative media.

Industry Standard Doesn’t Cut It? Try Humphrey Engineered Solutions

Sometimes, your system needs go beyond what the market-variety valves can provide. This is not unusual. In fact, one of the most frequent requests we receive from customers is to tailor the air piloted valve to their specific requirements. 

If your system does not or can not utilize industry-standard air piloted valves, we can help. We specialize in creating engineered solutions that more closely align with your needs without sacrificing performance or durability.

Get Better Air Piloted Valves

If you are interested in learning more about air piloted valves or understanding how you can implement better solutions into your systems, we are here to help. Contact us anytime for additional information.


View in Online Catalog
air piloted valves

Improve Seal Performance in Aggressive Media Applications

FFKM test comparison
Now Available from Humphrey Products: 350/351 iDP Valves with FFKM Elastomer
FFKM (left) exhibits less volume swell than standard elastomer (right) in aggressive media applications.

Kalamazoo, MI – While o-rings and sealing components made from other elastomers are prone to failure when exposed to caustic and hazardous media, FFKM (perfluoroelastomer) offers near-universal chemical compatibility.

With superior inert properties, FFKM resists extreme volume swell when exposed to more than 1,800 chemicals, solvents and plasmas, including:

  • concentrated nitric acid
  • sodium hydroxide
  • ethylene diamine

FFKM elastomers can withstand the harshest conditions, including environments such as those found in semiconductor manufacturing where oxygen plasma is present and medical use where aggressive agents are used for sterilization.

FFKM Features

  • Excellent chemical resistance (best in class, similar to PTFE)
  • Excellent gas and liquid permeation resistance
  • Excellent weather ability and ozone resistance
  • High Density
  • Good mechanical properties, improving sealing performance

The addition of FFKM to the 350 series iDP family allows engineers to use one valve style in a system that applies both aggressive media and lighter liquids. Aggressive circuits may use the 350/351 series with FFKM elastomers, while less aggressive circuits may use the cost-effective FKM and EPDM versions of the same valve. 

The proven reliability of FFKM seals in demanding applications may also allow for longer preventative maintenance schedules. The net result – lower costs from less maintenance. At the same time, process throughput, productivity and yields are enhanced from increased equipment uptime.

For more information, contact Humphrey Products online or call 1.800.477.8707

View in Online Catalog
idp 350-351 blog image

Super Quick Exhausts Enhance Performance of Air Cylinders

Humphrey Super Quick Exhaust valves feature a specially molded shuttle designed for extremely fast response when sensing upstream pressure differential, redirecting downstream pressure to its third port. We offer a size for virtually every need, with pipe ports from 10-32 UNF to 3/4 PIPE.

Our shuttle’s full-formed seating surface provides long life and outperforms flat-disk (sheet stock) diaphragms found in competitive valve designs. Because of its rubber shuttle design, the Humphrey Super Quick Exhaust valve prevents rupture without the need for flow-restricting metal body webbing of other designs. 

There are many practical uses for the cost-effective, versatile Super Quick Exhaust valves. 

Lubrication Problems: Small-bore pneumatic cylinders and actuators are often poorly lubricated due to the small displacement of air per cycle. Airline lubricant back-flows through the control valve on each exhaust cycle without reaching the cylinder. Oil traces at the control valve’s exhaust port does not prove proper cylinder lubrication.

To solve lubrication problems, close the nipple of the Super Quick Exhaust to the cylinder port. This redirects back-flow and allows progressive oil to flow to the cylinder. 

Air "Spring” Return: Super Quick Exhaust can provide controlled “air spring” return, a potential advantage over the standard spring return cylinders. 

“Air spring” return force can be adjusted by a regulator (1) while providing a method of controlling the cylinder with a more economical 3-way valve (2). Example of use: Cylinder rod (1) extends with high pressure for impact, and rod retracts under lower pressure.

Shuttle Valve: Reduce Air from 3-way valves (1 or 2) always directed to cylinder (3).

High-Low Pressure: Reduce noise, shock, and stress on the air cylinder. Extend rod with low pressure (1) to position rod with workpiece. Switch to high pressure (2) to lock, bend, or reposition workpiece, etc.

Other Humphrey Super Quick Exhaust Functions 

  • Flow Control Valve: Close nipple Super Quick Exhaust air cylinder port. Restrict exhaust flow at Quick Exhaust port 3 and control speed of the cylinder rod by metering exhausting air.
  • Check Valve: Plug port 3 of Quick Exhaust for check function. Allows full flow from port 1 to port 2. Check function occurs from port 2 to port 1.
quick exhaust valve

Specialty Valves for Medical Device Manufacturing

Over probably the past decade, the medical field has been moving to smaller devices and at-home care. Many of these devices are now required to run on battery power at least part of the time and must be conducive to the at-home patient setting. These requirements have pushed the valve market to develop new products that are smaller, lighter and require significantly less power to run.

Humphrey’s entry to this arena started with a portable Oxygen concentrator. The valves for this device needed to be smaller than we had produced before and of lighter material. Additionally, they need to provide a high level of flow within the small package size. These requirements were driven both by the need for the overall package to be light enough to be carried easily by the patient over their shoulder, and to allow for maximum hours of use out of a single battery charge.

From these requirements, Humphrey developed the CSV 10mm cartridge valve. The cartridge aspect of the design allowed the customer to apply the valve in several special manifold configurations while still only needing to purchase a single valve part number. The valve itself employs several plastic parts which significantly reduces the weight the valve adds to the overall package. The Humphrey design team was able to develop the valve technology to produce a significant flow rate of 40 lpm at only 30 psi. Additionally, the valve was designed to run with PWM, which can drop the power requirement from the standard 2 watts per valve to a running wattage of less than ½ watt.

One final important aspect that has been true to almost all recent medical applications Humphrey has been involved in is the need for quiet operation. As so many of the new device applications are designed for home use, quiet operation has worked its way to the top of the requirements list. Many of these devices such as Oxygen concentrators and dialysis machines are running while the patient is sleeping.  Therefore, it is vital that the previously normal “clicking” noise of a valve be significantly reduced. Customer responses to the noise variable of the CSV valves has been overwhelmingly positive. Even in the case of some dialysis machines with up to 22 valves running, the noise level was reported to be low enough to not disturb the patient.

In summary, the CSV valves offered by Humphrey can provide the user with:

  • Small package size
  • High flow
  • Quiet operation
  • Low power

Additionally, the CSV line has been expanded to now include a 12mm version, providing all the above benefits in an even higher flow package. The 12mm CSV valve can provide 125 lpm flow rates at 30 psi – more than three times the 10mm version.

Overall, the CSV valves have been a great starting point for Humphrey’s journey into the new medical device market. Expect that the CSV valves will be the lead for a number of other new advances designed specifically for this growing important market group.


Redesigned PCD Proportional Valve Driver Marries Trusted Functionality with Improved Control and Flexibility

The Humphrey Team is excited to announce the release of its redesigned ProControl™ Series PCD Proportional Valve Driver. 

Like the original model, the latest PCD proportional valve driver regulates the function of proportional valves through PWM or constant current signals. New navigation buttons provide operators with precision manual control and flexibility for various drive/control inputs. The valve and interface can also be controlled with various data acquisitions, including PLCs, IoTs or closed-loop systems.

PCD Proportional Valve Driver Features

The PCD proportional valve driver is exceptionally versatile. Its customizable interface can control a proportional valve on your test bench for evaluation and then transition to a production environment. You can also integrate the valve and driver into your system and use your DAQ output for valve control.

Input features

  • 0 to 5v, 0 to 10v and 4 to 20mA input options
  • Manual input control via navigation buttons
  • Valve presets for Humphrey valve models PV3, PV10, PC30 and iDP390/391 
  • Customized control mode for other proportional valves 
  • Signal conditioning via linearization attribute 
  • Screwless, push-button clamp connector
  • LCD screen and readout

Output features

  • Constant Current
    • 0 to 1 Amp
    • Dithering: 0 to 40mA
  • PWM
    • Frequency options: 500, 1.25k, 2.5k, 5k or 10k Hz
    • Duty Cycle: 0 to 100%
    • Dithering: 0 to 10%

Contact our ProControl™ application specialist at 1.844.447.9009 or email for more information and setup assistance.

View in Online Catalog
PCD Proportional Valve Driver

Humphrey Products Launches Updated Website

Kalamazoo, MI – Humphrey Products is committed to providing cutting-edge control products and services, including an innovative online experience.

We are pleased to announce the launch of our updated website, which features an improved layout and navigation to enhance the user experience. The content has also been reorganized to make it easier for users to find what they need. 

Users may now quickly peruse the newest products by category and search for tried and true products with the touch of a button in our upgraded online catalog, which features downloadable CAD and two-dimensional drawings, as well as data sheets and line cards. The expanded literature library includes additional product information available for download. 

Those needing assistance with valve selection or product customization can easily submit contact forms through the website, and clickable phone numbers allow for convenient calling from mobile devices. 

We look forward to your user experience feedback. Please contact us online or call 1.800.477.8707.


Subscribe to