Aircraft motion control still depends heavily on hydraulic technology whose core architecture has changed little in decades. For all their proven performance, conventional valve technologies often bring accepted penalties in leakage, weight, thermal burden, and continual energy consumption. In many traditional two-stage valves, hydraulic energy is lost through internal leakage and power is still required even when no useful motion is taking place. In aerospace, those losses do not stay inside the component. They add to system power demand, heat generation, packaging pressure, and ultimately fuel burn.
Electro-mechanical alternatives promised a different path, but adoption in safety-critical aerospace functions have remained limited. That has left much of the aerospace industry living with a familiar compromise; the incumbent hydraulic architectures are proven, but they are not efficient in the way modern aerospace systems increasingly need them to be.
For engineers working on flight control actuation, landing gear, or braking, the challenge is not simply to make components smaller. It is to reduce losses across the hydraulic system without compromising response, stability, or reliability. The best place to start is with how the system uses hydraulic power, then work back to the architecture and component choices that define that outcome.
Why Aerospace Fluid Control has Always Involved Compromise
Aerospace fluid control has long involved compromise. Traditional two-stage servo valves are trusted for precise, responsive control, but they bring complexity, pilot-stage leakage, and sensitivity to contamination. Direct-drive architectures offer a simpler route with lower internal leakage, but have historically struggled to match the response, flow density, and packaging demands of the most challenging aerospace applications.
That matters because aerospace engineers are rarely selecting for one parameter in isolation. Small size alone is not enough. Low leakage alone is not enough. High flow alone is not enough. The real opportunity is to reduce leakage and weight without giving away dynamic performance, thermal resilience, durability, or the reliability expected in demanding aerospace and defence environments.
Weight and Leakage are System Problems
In aerospace systems, the effects of excess weight and internal leakage go well beyond the component itself. A heavier valve does not just add grams to a bill of materials. It can increase mounting demands, consume more of the available installation envelope, and add mass elsewhere in manifolds, brackets, and surrounding structure. Internal leakage creates a different but equally important penalty. It is hydraulic energy that has already been generated and pressurised, only to be lost before it delivers useful work.
That is why the impact is cumulative. More wasted energy means more power demanded from the system. More power demand means more heat. More heat can mean more thermal management system burden. More mass brings structural burden and packaging pressure, and ultimately this all leads to more fuel required to carry that weight through the aircraft.
In an aircraft operating with traditional two-stage valves, more than 75% of the energy is lost before it has even created useful movement.
Seen in that light, reducing weight and leakage is not about chasing a better datasheet number. It is about improving how effectively the system turns hydraulic power into controlled motion.
Better Efficiency Starts with Better Control Architecture
The more useful question is not how small a component can be made, but how effectively the system controls flow and pressure without unnecessary loss or mass. That puts control architecture at the centre of the discussion.
In aerospace, reducing leakage cannot come at the expense of response, stability, or repeatability. Reducing mass cannot come at the expense of robustness. The goal is to improve hydraulic efficiency while protecting the control characteristics the application depends on.
That means looking for valve designs that manage flow cleanly, minimise wasted energy, and remain predictable under vibration, elevated temperatures, and demanding duty cycles. That is why leakage and weight should not be discussed in isolation. In aerospace, engineers also have to consider flow density, dynamic response, thermal resilience, durability, and installation constraints. Real progress comes when these factors improve together, not when one improves at the expense of the rest.
The Best Gains Come From Smarter Trade-Offs
In practice, the strongest results usually come from system-level trade-offs. A more compact valve matters if it reduces installation burden or supports a cleaner hydraulic layout. Lower leakage matters if it comes alongside stable, repeatable control.
That balance matters across aerospace applications. In flight control actuation, engineers need precise, stable response with no room for inconsistency. In landing gear and braking systems, packaging, durability, and dependable hydraulic performance all matter at once.
This is why better aerospace hydraulics are rarely the result of one dramatic change. More often, they come from a series of better design decisions that reduce unnecessary mass, lower hydraulic losses, improve thermal behaviour, and maintain control integrity as one connected outcome.
Thermal Resilience Matters
In aerospace, thermal performance is not separate from hydraulic performance. Leakage, component architecture, electronics integration, and packaging all influence how well a system can maintain stable and predictable behaviour in hotter and more demanding environments. That is important not only for efficiency, but for reliability, durability, and confidence in real operating conditions.
This is especially critical in applications closer to engines, fuel systems, auxiliary power units, and other harsh operating zones, where high temperature capability can shape whether a technology is viable at all. In these environments, reducing thermal burden is not just about good system design. It can be central to maintaining control quality and long-term reliability.
How Domin Helps Reduce the Aerospace Trade-off
This is where Domin becomes relevant in aerospace. Not simply valves that are smaller for their own sake, but being enablers of system-level gains that matter.
A lighter, more compact valve can reduce installation burden, free up valuable space, and lower the wider package penalty around the component. Lower internal leakage means less hydraulic energy wasted before it performs useful work, helping reduce both power demand and thermal load. A direct drive design also removes the continual pilot-stage losses associated with traditional two-stage architectures, which matters in systems that spend significant periods holding position rather than actively moving. Together, those gains can have a compounding effect across the aircraft.
The opportunities here are not theoretical. Replacing all incumbent valves on a current generation wide body aircraft, points to meaningful system-level gains.
Switching to Domin Valves alone could deliver more than *79 kg reduction in aircraft hydraulics hardware mass, more than 76 kg fuel saved per aircraft per flight, more than 41,000 USD fuel saving per aircraft per year, and more than 75 tonnes CO2 saved per aircraft per year. Replacing on just the flight control system could also remove more than 3.5 kW of continuous quiescent power demand from the aircraft
*Weight and energy savings verified by the ATI Toolkit.
Aerospace fluid control has historically involved a compromise between the compact, responsive behaviour of two-stage architectures and the lower-leakage, simpler architecture of direct drive designs. Domin’s impact lies in helping reduce that trade-off. That shift is enabled by a set of core technologies:
Domin Technology | How it Enables Better Aerospace Outcomes |
| Metal 3D Printing | Enables a the most compact and lightweight valve architecture by removing the design constraints of traditional manufacturing. It also allows internal flow paths to be optimised, helping to reduce unnecessary bulk and support more efficient use of hydraulic power. |
| Slim Onboard Electronics | Enables a smaller overall valve package by integrating control electronics within the valve rather than relying on larger external or centralised electronics. This helps reduce installed weight, simplify integration, and lower system complexity. |
| Direct Drive Servo Valve Design | Enables lower internal leakage by removing the continuous pilot-stage losses associated with traditional two-stage architectures. This helps reduce wasted hydraulic energy, lower thermal load, and improve overall system efficiency. |
| Brushless DC Motors | Enables a direct-drive architecture to deliver the torque and responsiveness needed for demanding aerospace duty. This helps make low-leakage direct drive viable without sacrificing control force, pressure capability, or dynamic performance. |
| Hall Effect Sensors | Enables accurate position feedback in a much smaller and lighter package than traditional transducers. This supports compact valve design while maintaining the control position and repeatability aerospace applications require. |
| Control Algorithms and Firmware | Enables the valve to maintain stable, precise, and repeatable behaviour from a compact, low-leakage architecture. They help minimise overshoot, improve responsiveness, and protect control quality under demanding operating conditions. |
For aerospace engineers, the value is clear. Less space and mass. Less wasted hydraulic energy. Less continual power draw when nothing needs to happen. Better use of the hydraulic power already available. Better fuel economy potential as those efficiencies compound across the wider system. That is a much more meaningful impact than simply saying a valve is smaller or lighter.
Why This Matters Now
Ultimately, reducing weight and leakage in aerospace is not simply about doing less. It is about doing more with the hydraulic power, space, and thermal capacity already on the aircraft. When those gains come with the control quality, reliability, and proof aerospace programmes require, the result is a stronger motion control architecture with practical value today.
These huge benefits do not have to wait for a future aircraft platform. Where legacy valves are creating unnecessary leakage, weight, and energy loss, there is already an opportunity to improve system performance through Domin upgrade paths. Domin already supports customers across all industries, replacing incumbent valves with low-risk, high-reward Domin Valves that are designed for straightforward integration, giving aerospace teams a way to access meaningful gains now rather than postponing them to the next aircraft programme cycle.
Contact us to start the conversation.
