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V Series Guided Piston Relief Valves

Application

 The sliding piston concept and internal design contours of FULFLO valves provide unique flow and stability characteristics for reliable performance without chatter. Unlike ordinary direct acting relief valves, FULFLO guided piston valves are less responsive to transient pressure surges thereby eliminating the tendency to pound, squeal or chatter. Quiet, stable, efficient performance is assured in both load regulation and system protection applications. FULFLO valves operate effectively with all types of liquids in the full range of viscosities including hydraulic oils, water, solvents and chemicals. Since the FULFLO relief valve is a flow-modulating device, pressure flow characteristics are completely different from spring loaded poppet or ball check valves. Both types remain substantially tight up to cracking pressure. When this pressure is exceeded, the “conventional” valve pops open with a pressure drop at very low flow and an exponential pressure rise as the flow increases. In contrast the FULFLO valve causes a pressure rise, over-pressure, as soon as flow starts; pressure increases almost proportionally with flow. Springs and areas on FULFLO valves are carefully designed to minimize this over-pressure.

Note

 FULFLO valves are not designed to be positive shut off, and will pass a minimal amount of leakage before the set pressure. FULFLO valves are NOT designed for use with air, gas or steam.

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