1. A hydraulically-operated piston which seals off a well when the blowout preventer is actuated.
2. The piston rod of a hydraulic cylinder as in a ram-type steering gear.
Wärtsilä is a global leader in smart technologies and complete lifecycle solutions for the marine and energy markets. By emphasising sustainable innovation, total efficiency and data analytics, Wärtsilä maximises the environmental and economic performance of the vessels and power plants of its customers.