Increased performance for two-stroke marine engines

• Bosch Rexroth introduces new ELFI and ELVA pilot valves designed for Everllence two-stroke marine engines to optimize fuel consumption and engine efficiency.

• These valves offer high precision, fast response times under 5 ms, and consume approximately 20% less energy compared to conventional valves.

• They support operation with future CO₂-free fuels such as methanol and ammonia, aligning with maritime emission reduction goals.

• The valves have a long service life of 5 to 7 years and Bosch Rexroth guarantees spare parts delivery within 24 hours through a global service network.

• Availability of the new pilot valves is planned for the second half of 2027.

New ELFI and ELVA pilot valves from Bosch Rexroth for two-stroke engines manufactured by Everllence optimize fuel consumption and availability.

• High-performance continuous operation: quality, precision, and dynamics

• Optimized engine efficiency, even with alternative fuels

• Reliable spare parts supply within 24 hours

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Modern two-stroke engines are designed to lower fuel consumption in the maritime industry and reduce emissions. Bosch Rexroth supports this development with two new pilot valves: ELFI and ELVA. They are designed for continuous operation and, thanks to their high precision and dynamics, enable optimized engine efficiency, even with future fuels such as methanol or ammonia. Bosch Rexroth’s consistently fast and reliable supply of spare parts is essential for seamless maintenance.

In Everllence’s two-stroke engines, ELFI (Electronic Fuel Injection) controls the injection timing and injection volume per cylinder, while ELVA (Electronic Valve Actuation) actuates the exhaust valve across the load range. The new pilot valves from Bosch Rexroth, with the type designations 4WRRFH (ELFI) and WRPFH (ELVA), control these two functions just as quickly and precisely as conventional valves, while consuming approximately 20 percent less energy.

The pilot valves, developed in close collaboration with Everllence, operate with high repeatability even under the most demanding conditions. Combined with a step response time of less than 5 ms and a frequency response of over 200 Hz, they can precisely reproduce the required injection profiles.

Application-specific test series by Everllence, as well as performance and endurance tests by Bosch Rexroth, demonstrate the capabilities of the new pilot valves. The service life of five to seven years, calculated on this basis, corresponds to more than 340 million switching cycles.

Both valves also support operation with future fuels such as methanol or ammonia. In the long term, these fuels could be produced from green hydrogen and can replace heavy fuel oil, which is commonly used in shipping today and emits particularly high levels of pollutants. The combustion of these future fuels is CO₂-free.

The pilot valves will be available in the second half of 2027.

At the same time, customers benefit from Bosch Rexroth’s global service network. Thanks to scalable manufacturing capacities and local inventory, manufacturers and operators of two-stroke engines can rely on the fastest possible delivery – within 24 hours – in the event of a service call. Bosch Rexroth ensures this through a global, round-the-clock network comprising over 200 service centers and strategically located repair centers, thereby creating ideal conditions for maximum availability.