When an apparatus valve won't turn, the department calls the builder. For the OEMs and integrators who spec pump-panel components, every actuator failure is an unplanned service call.
A fire truck needs a valve that turns every time: in a cold bay at 6 a.m., after an hour of pumping, on the first call of the shift or the last. AMOT builds the electric part responsible for that turn. Our EH Series is an electric quarter-turn rotary actuator that opens and closes the apparatus valves on a fire truck's pump panel: discharge, intake, recirculation, water and foam. It works on any quarter-turn valve and is built to last in the harshest applications. In this post: what a failed actuator costs, why most aren't built for this job, and how the EH Series fits a build that already runs Elkhart Brass or Akron Brass valves.
In short: The AMOT EH Series is a 24 VDC electric quarter-turn actuator built for fire truck apparatus valves. It's rated IP67/IP69K for washdown, tested to MIL-STD-810G for shock and vibration, rated past 1,000,000 cycles, and mounts to a standard ISO 5211 F07 flange pattern, so it isn't locked to one valve brand or one bolt-on position.
Pictured above: A pump compartment with a four-valve discharge manifold. Every handwheel here is a manual valve, and each one is a candidate for an electric actuator.
What a stuck apparatus valve costs
More than the part. A stuck valve can take a rig out of service, and for emergency apparatus, that isn't an option.
Fire trucks and rescue apparatus run daily checks, pump tests, and training cycles so every system is confirmed ready before it's ever needed for real. There's no warm-up lap in an emergency. Whatever the truck did yesterday, it has to do again right now, in January or August.
When an actuator does fail, the bill goes past the part: diagnosis, labor, and the days the rig spends in the shop. With technician shortages and parts backlogs, those days can stretch longer than anyone wants.
For the apparatus builder who specified the part, a failure in the field means something else: a warranty claim, a comeback, and a harder conversation at the next order.
An actuator that fails at the wrong moment carries costs that extend well beyond the purchase. Reliability is the real measure of value.
Why most actuators aren't built for this
Because the conditions that define an emergency vehicle are the same conditions that shorten actuator life: cold soak, thermal cycling, road and pump vibration, washdown, and heavy duty cycles, repeated for years.
Electric actuation has historically been the distrusted option in this environment, and the reputation was earned, just not by the technology itself. Standard electric actuators, built for the factory floor and non-mobile applications, are the ones that struggle here. They often don't have the margin for extreme temperature swings, aren't tested to enough cycles, and aren't built to resist vibration or shock. They also lack the IP67/IP69K sealing that washdown demands.
What AMOT actually sells: the EH Series
Pictured above: The AMOT EH Series an electric quarter-turn actuator built for pump vibration, washdown, and years of heavy duty cycles on fire apparatus.
An electric quarter-turn actuator engineered from day one for apparatus-grade duty, not adapted from an industrial or automotive design after the fact.
AMOT built the EH Series specifically for apparatus-grade duty, backed by AMOT's decades of control and safety experience in engines and turbines. Every number below is a result we designed around, not a spec we added later.
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Specification |
EH Series |
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Voltage |
24 VDC |
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Torque options |
25 Nm and 125 Nm |
|
Mounting flange |
ISO 5211 F07 (standard across valve brands) |
|
Mounting orientation |
Any — vertical, horizontal, or upside-down (fully sealed unit) |
|
Sealing |
IP67 and IP69K (full washdown) |
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Shock |
MIL-STD-810G, 40G |
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Vibration |
14.1 GRMS, 10–1000 Hz, 20 hours per axis |
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Duty cycle |
100% at maximum rated load and maximum temperature |
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Endurance |
1,000,000+ cycles at rated load |
|
Operating temperature |
−40°C to 125°C |
Torque is the only variable that changes between the two EH Series models. Sealing, durability, mounting, and controls stay identical, for a retrofit or a new build. The ISO 5211 flange and full sealing also mean the same actuator works whether it's bolted right-side up, sideways, or upside-down under a pump panel.
Speccing actuators for a new apparatus build, or chasing down a valve that's failing in the field? Talk with an AMOT actuator expert about your application → Contact Us.
Does the EH Series fit Elkhart Brass and Akron Brass valves?
Elkhart Brass and Akron Brass apparatus valves are quarter-turn designs built to accept a choice of manual, air, gear, or electric actuation. The EH Series works on any quarter-turn valve, including those from Elkhart Brass and Akron Brass, with the appropriate mounting adapter. Confirm fit with an AMOT engineer.
Elkhart Brass and Akron Brass have spent decades earning trust on the valve body itself: ball design, sealing, serviceability, cross-compatibility with existing plumbing. It's solid engineering, and a big reason their valves show up across the industry.
Pictured above: AMOT EHC actuators mounted on a pump manifold during build, automating quarter-turn valve control on apparatus.
What to look for in a fire truck valve actuator
Whatever valve you run, the actuator on it faces the same conditions. Before you spec one, ask your supplier for these numbers and how each was tested.
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Ask about |
Why it matters on apparatus |
EH Series |
|
Shock rating |
Potholes, curbs, and pump engagement |
MIL-STD-810G, 40G |
|
Vibration rating |
Road and pump vibration loosen and wear parts |
14.1 GRMS, 10–1000 Hz, 20 hours per axis |
|
Cycle life |
Daily checks, pump tests, and training add up |
1,000,000+ cycles at rated load |
|
Operating temperature |
From a cold bay at 6 a.m. to engine-bay heat |
−40°C to 125°C |
|
Sealing |
High-pressure, high-temperature washdown |
IP67 / IP69K |
|
Mounting |
Fit across valve brands and positions |
ISO 5211 F07, any orientation |
|
Controls |
Fitting into a networked apparatus |
CANbus J1939, 4–20 mA, 0–10 V, or PWM |
If you're speccing Elkhart or Akron valves and want to talk through actuator options, an AMOT engineer can walk through torque, mounting, and control requirements for your build → Talk to an expert.
A quick primer: actuator types, and why valves open slowly
Linear actuators position equipment: raising a light tower, aiming a deck monitor, tilting a stretcher. Rotary (quarter-turn) actuators control flow by turning a valve, the job the EH Series is built for.
There's a safety reason apparatus valves open the way they do. Open a water line too fast and you get water hammer: a pressure shock that's hard on the plumbing and harder on the firefighter holding the nozzle. NFPA 1901 addresses this directly, requiring large apparatus valves to open gradually instead of all at once. A rotary actuator delivers that control: the same quarter-turn, every time, training run or working fire.
Every call is the one that counts
Every critical apparatus valve on an emergency vehicle is only as dependable as the hardware that controls it. When reliability matters, trust AMOT.
Talk with an expert about your application, or see the EH Series in action → Contact us.
Frequently asked questions
What is the AMOT EH Series?
The AMOT EH Series is a 24 VDC electric quarter-turn rotary actuator built to control apparatus valves in demanding environments, including fire trucks and rescue vehicles. It's rated IP67 and IP69K, tested to MIL-STD-810G, and good for more than 1,000,000 cycles.
Does AMOT make apparatus valves like Elkhart Brass or Akron Brass?
No. AMOT builds the electric quarter-turn actuator that drives the valve, not the valve body for the apparatus itself. Apparatus valves from manufacturers like Elkhart Brass and Akron Brass are typically engineered to accept a choice of manual, air, gear, or electric actuation. The EH Series is AMOT's purpose-built electric option, engineered specifically for apparatus-grade duty cycles, vibration, and washdown.
Can the EH Series be used with Elkhart Brass or Akron Brass valves?
Yes. The EH Series works on any quarter-turn valve, including those from Elkhart Brass and Akron Brass, with the appropriate mounting adapter. Confirm fit for your specific valve with an AMOT engineer.
What should I look for in a fire truck valve actuator?
Look for published ratings on shock, vibration, cycle life, operating temperature, and washdown sealing, plus a standard mounting flange and controls that fit your apparatus. The EH Series publishes all of them: MIL-STD-810G 40G shock, 14.1 GRMS vibration, 1,000,000+ cycles, −40°C to 125°C, and IP67/IP69K. See the checklist above.
Can the EH Series be specified for new apparatus builds, not just retrofits?
Yes. The EH Series can be specified into new pump-panel and valve designs as well as retrofit onto apparatus already in service. Apparatus builders can talk with AMOT early in the build process to match torque and mounting to the valve.
What valves can the EH Series mount to, and in what position?
The EH Series works on any quarter-turn valve and bolts to a standard ISO 5211 F07 flange pattern, so it isn't built around one valve brand or model. It's also a fully sealed unit rated to run in any mounting orientation, vertical, horizontal, or upside-down under a pump panel. Valves with a different ISO 5211 flange size may need an adapter, so confirm fit for your valve with an AMOT engineer before ordering.
Is the EH Series rated for washdown?
Yes. The EH Series carries IP67 and IP69K ratings, covering dust ingress and high-pressure, high-temperature washdown.
Why does vibration resistance matter for mobile and emergency vehicle applications?
Actuators on mobile equipment face constant vibration from the road and, on fire apparatus, additional vibration from the pump itself. Components not designed for that load can loosen, wear, or fail early. The EH Series is tested to 14.1 GRMS (a standard measurement of vibration intensity) across 10–1000 Hz and MIL-STD-810G 40G shock, standards built around that kind of continuous, compounding vibration.
What temperature range does the EH Series operate in?
The EH Series operates from −40°C to 125°C, covering cold-weather starts through engine-bay heat.
How many cycles does the EH Series last?
The EH Series is rated for more than 1,000,000 cycles at rated load, with a 100% duty cycle at maximum rated load and maximum temperature.
