Just Ask Engineering: Pump Life Expectancy
WAYNE HABLE, P.E., CHIEF ENGINEER What is a pump's life expectancy, and how can it be extended? A Darley fire pump is engineered to deliver dependable performance in some of the most demanding emergency response environments. Whether supporting municipal firefighting,...
The Role of the Thermal Expansion Valve (TXV)
BY KEVIN ROBERTS When a water pump moves coolant through the cooling system it does not contribute primarily to the pressure in the system. That pressure comes from the heat of the coolant trying to expand inside a closed system. There is a slight pressure difference...
Industry Trends and Priorities: Needs vs. Wants
BY MICHAEL HUBER Anyone who has been around a while and has attended conferences, showcases, and industry meetings knows that the fire service/emergency medical service (EMS) always has new gizmos and gadgets. There is never a shortage of new great ideas....
Darley’s James Long Retires
Darley employees often talk about the importance of people. Strategies evolve, markets change, and technologies advance, but it is dedicated individuals who build a company's culture, strengthen its capabilities, and help shape its future. This year, the company...
ARTICLES
Darley’s James Long Retires
As president of the Defense Division and a member of Darley’s executive leadership team, James has played a pivotal role in helping build Darley into the organization it is today.
Darley Named No. 2026 on the 2026 Inc. 5000 List
Among the 5,000 companies on the list, the median three-year revenue growth rate was 130%, and those companies have collectively added more than 627,208 jobs to the U.S. economy over the past three years.
The Principle of Latent Heat
Latent heat disappears, but that heat does not cease to exist, just that we cannot measure it with a thermometer. Understand how making use of latent heat is what makes an HVAC system efficient.
Inside Darley: September/October 2026 Edition
Pump modules have been a growing area for the company as fire truck builders have long backlogs coming in. Darley has been able to help fill those needs.
PRESS RELEASES
Darley “SAFE” Roll Hose Roller
Darley has partnered with Operational Fire, which developed and designed the patented Safe Roll.
Darley Welcomes Jack “J.” Taylor III to Fire Advisory Board
Darley, a leading provider of defense, fire, and emergency services equipment, announces the appointment of Jack “J.” Taylor III to its Fire Advisory Board.
Denver (CO) Fire Department Orders Three Spartan Emergency Response S-180 Custom Pumpers
The Denver Fire Department is adding Spartan custom pumpers to update its fleet and to accommodate continued growth in the city.
Darley Welcomes General Joseph Votel to Board of Directors
General Votel brings a distinguished record of military leadership, strategic expertise, and a lifelong commitment to serving the nation’s warfighters.
APPARATUS GALLERY
VIDEOS
Inside Darley: March/April 2026
Spring is here and that means it’s time for the spring/summer issue of the Darley Times newsletter, which features an article on new president Lee Wise, and more.
Inside Darley: January/February 2026
Darley starts the new year with a new five-year strategic plan called “3B30.” That’s a goal to be a $3 billion business by the year 2030.
Inside Darley: November/December 2025
In this edition, Paul Darley discusses the company’s growth with the U.S. Department of Defense. The company is also engaged in wildfire management, leadership development, and more.
Inside Darley: September/October 2025
Paul Darley discusses the success of the company’s internship program and offers tips for family businesses to continue family ownership generation after generation.
Inside Darley: July/August 2025
Paul Darley and more than 300 employees and their families enjoyed a weekend in the Wisconsin Dells to celebrate hitting a billion dollars in revenue. Deloitte presented Darley with the Best Managed Company award, one of 60 companies in the U.S. to received it.
Inside Darley: May/June 2025
Explore highlights from Darley’s May-June issue of Inside Darley, including record attendance at FDIC, new catalogs, and upcoming events like NDIA and the IL Fire Service Home Day.
LATEST
Just Ask Engineering: Pump Life Expectancy
A proactive maintenance program not only reduces the risk of unexpected failures, but also helps lower operating costs and ensures the pump is ready for an emergency.
Darley “SAFE” Roll Hose Roller
Darley has partnered with Operational Fire, which developed and designed the patented Safe Roll.
The Role of the Thermal Expansion Valve (TXV)
The TXV performs two tasks. First, it monitors the temperature of the evaporator core outlet. Second, it controls the amount of refrigerant entering the evaporator core inlet.
Industry Trends and Priorities: Needs vs. Wants
Apparatus committees must have foresight and look beyond the excitement of the newest gadgets and technology to make decisions that will serve their departments for the next 10 to 20 years.
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RIGS
Denver (CO) Fire Department Orders Three Spartan Emergency Response S-180 Custom Pumpers
The Principle of Latent Heat
E-ONE Select Series Aerial in Service for KY Department
Equipment
Just Ask Engineering: Pump Life Expectancy
A proactive maintenance program not only reduces the risk of unexpected failures, but also helps lower operating costs and ensures the pump is ready for an emergency.
Inside Darley: September/October 2026 Edition
Pump modules have been a growing area for the company as fire truck builders have long backlogs coming in. Darley has been able to help fill those needs.
Just Ask Engineering: What Makes a Part Reusable or Not?
When rebuilding a pump, deciding what to replace versus reuse is a common question. Fortunately, the process is straightforward: break the pump into individual components and evaluate each piece one at a time.
EV Tech Talk: What Happens When You Shift Out of Road Mode Into Pump Mode?
Fire department training divisions should include some input from the mechanical division. As a mechanic, I can’t teach someone the proper way to put out a fire. I’m not trained for that. In the same breath, firefighters aren’t expected to know how the equipment they use works mechanically. Although firefighters don’t need to understand how to fix the equipment, a general understanding of how something works affects how they use it.
