A recent cross industry study in the USA estimated the average efficiency of hydraulic systems to be 22% and that for the USA alone this contributed over 300 Million of Tonnes of CO2 a year*.
An internal Domin study of the operation of construction Excavator confirmed these figures showing an overall efficiency of the hydraulic system to be 19 to 25 % (depending on operating duty).
Individual components within hydraulic systems (such as pumps and motors) have long been able to demonstrate power transfer efficiencies of up to 95%.
The challenge for system designers has been in combining high efficiency over a wide duty cycle, compact size and bi-directional energy control. As with electronic control, the obstacles have proved insurmountable when systems are controlled in an analogue or continuously variable basis. Variable control is the industry standard for Fluid Power. However, operating hydraulics in a discrete or ‘digital’ form is not new.
Displacement controlled pumps and motors have proved highly efficient with >90% in most operating conditions. They have gained acceptance in large scale applications such as wind turbine transmission**.
Domin has been able to take the principles of discrete operation and combine these with; their core technology of high-speed control valves, Domin’s emergent technology of compact hydraulic machines, energy storage in gas accumulation and advanced high speed motor control.
The result is ultra-compact digital hydraulic systems based around complex AM manifolds. The key is to be able to both drive and regenerate energy at >90% efficiency at high bandwidth and wide operating power levels.
* In our Excavator study we were able to model a reduction in fuel use to 38% of the current baseline. This is consistent with improving the overall system efficiency to 75-80%. For our example of a 20T Excavator we project an annual fuel saving of £7,800 and an environmental benefit of 41 Tonnes of CO2.
** These savings represent a global reduction in CO2 of over 1 Billion Tonnes per annum. In economic terms this represents a direct fuel cost saving for the users of £190 Billion. Additionally, we have an environmental benefit in CO2 emissions that would be reasonable to consider at £37 /Tonne saving ($50 USD). The societal benefit is therefore well over £200 Billion.
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“The Domin S6 Pro is a high-performance valve that competes very well with the other major manufacturers in terms of motion control performance, particularly with position and force control.
The linear response of control output to flow of the valve allows it to be tuned easily and the response time and bandwidth are very good. The valve exhibits excellent force control and is very stable during motion.
In the testing we performed, we were not able to get the valve to misbehave or go unstable, which means the valve can handle very difficult control situations.”
"We have now fully transitioned from the Woodward HRT 15 gpm servo valve to the Domin S6 Pro servo valve for piloting the Olmsted 32mm, 40mm, 50mm, and 63mm high performance cartridge valves.
The Domin valves have proven to be very rugged and reliable with outstanding performance."
"The valve was within specs (in terms of pressure drop and response time) and was much better than the Moog D633.
This is very good news for the future tests we will be performing."
“The Domin S6 Pro performs exactly as you advertised, extremely responsive, small in size, and looks great!”
"The valve is well made, solid, looks great and has a nice finish. It has great hysteresis and good repeatability. We tested it thoroughly and were unable to find any faults."
“Domin is an outstanding organization to work with and the advancements they’re making with once “traditional” hydraulic servo products is a game-changer for the industry.
The Domin valves are highly responsive, true to spec, easily tuned, repeatable, reliable and extremely robust.”
"The Domin S6 Pro servo valve is the best servo valve we have ever seen. It has an incredible response time and is unbelievably tiny."
“Domin’s customer service is the only thing that outshines the performance of the valves. The valves performance, configurability & durability is simply unmatched.
We’ve been able to replace several OEMS valves with a single Domin valve. We’ve put the Domin into our harshest applications & it performed flawlessly.”
"The customer and myself are very impressed with the performance of the valve in such a small package."