Fulflo's hydraulic bypass valves are self-modulating, operating automatically in response to pressure on the system. The guided piston valves open and close in proportion to system pressure and do not slam open and shut. This eliminates the chatter and squealing associated with other relief valves.
 
A completely mechanical process, valve operation doesn’t depend on sensors that can be temperamental or fail. The result is consistent, reliable operation that protects pumps and downstream equipment from overpressure damage.