Bosch Rexroth Debuts Pilot Valves for Marine Engine Efficiency

Bosch Rexroth has introduced two new pilot valves, ELFI and ELVA, designed to optimize fuel consumption and lower emissions in modern two-stroke marine engines manufactured by Everllence. Built for years of high-performance continuous operation, the valves deliver exceptional precision and dynamics.

The ELFI (Electronic Fuel Injection) valve controls injection timing and volume per cylinder, while the ELVA (Electronic Valve Actuation) valve actuates the exhaust valve across the load range. With a step response time of less than 5 milliseconds and a frequency response exceeding 200 Hz, the new components control these critical functions while consuming approximately 20 percent less energy than conventional alternatives.

Developed in close collaboration with Everllence, the 4WRRFH (ELFI) and WRPFH (ELVA) valves feature a calculated service life of five to seven years, equating to more than 340 million switching cycles. Furthermore, the components are fully compatible with future CO₂-free maritime fuels, such as green methanol and ammonia, supporting the shipping industry's broader decarbonization goals. Set to be available in the second half of 2027, the pilot valves will be backed by Bosch Rexroth’s global service network, ensuring 24-hour spare parts delivery to maximize engine availability for operators worldwide.

Additional Context
This section provides technological and market background not explicitly detailed in the original release.

The maritime industry is facing stringent International Maritime Organization (IMO) regulations, pushing shipowners to transition from heavy fuel oil (HFO) to low-emission alternatives. Everllence's two-stroke dual-fuel engines, such as the ME-LGIM designed for methanol and the upcoming ME-LGIA for ammonia, require extremely precise electronic fuel injection to manage these new combustion profiles safely and efficiently. In these modern engines, electronic control systems have completely replaced traditional mechanical camshafts. Pilot valves serve as the critical electro-hydraulic interface, translating digital signals into the hydraulic power required to drive the heavy main fuel injectors and exhaust valves. The extreme responsiveness of the ELFI and ELVA valves enables highly precise "rate shaping" of the fuel injection. This exact timing is essential for optimizing combustion efficiency, preventing unburned fuel slip, and ensuring reliable, carbon-neutral vessel propulsion.

Edited by Lekshman Ramdas, Induportals editor – adapted by AI.

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