Since being established in 1912, Fulflo has been a pioneer in fluid power and hydraulic bypass relief valves. Fulflo held patents for the original guided piston, direct-acting relief valves, and pilot valve controlled relief valves. Fulflo relief valves work off the principle that the valve must have flow capacity equal to that of the pipe lines to which it is connected. With the sliding piston concept and internal design contours, Fulflo valves have unique flow and stability characteristics with reliable performance without chatter. The optimal pressure range for Fulflo valves to operate reliable is as low as 2 PSI to as high as 1000 PSI. At higher pressures, the pilot valve-operated valves are used to accommodate the conditions.
Fulflo valves minimize system power loss by reducing velocities through all but the controlling interface of the valve. Transient pressures surges tend to cause ordinary direct acting relief valves to pound, squeal, and chatter, but the Fulflo guided piston valves are less responsive to such pressures eliminating those tendencies. FulFlo valves ensure quiet, stable, and efficient performance for load regulation and system protection applications involving effectively all types of liquids in the full range of viscosities including hydraulic oils, water, solvents, and chemicals.