SUN HYDRAULICS CORP
RVETLCN
Pressure Control

Ventable, pilot-operated, anti shock relief cartridges limit maximum system pressure and also limit the rate of pressure rise. The valve opens and then ramps closed at a constant speed, independent of settings and flows. These 3 port valves include a vent port (port 3) that connects between the main piston and the pilot stage to provide for remote control by other pilot or 2-way valves. The adjust screw determines the maximum (relief) setting and the minimum (threshold) setting.

• Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
• Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
• A remote pilot relief on port 3 (vent) will control the valve below its own setting.
• Not suitable for use in load holding applications.
• When pressure at the inlet (port 1) exceeds the threshold setting, the valve opens to tank (port 2). The pilot section moves forward at a steady rate, increasing the setting by compressing the pilot spring. Maximum setting is achieved when the pilot section reaches a mechanical stop.
• Valve provides protection for hydrostatic drives by reducing the jerk caused by sudden reversals. The valve is suitable for cross-port applications.
• When used with a switching device, the valve can provide the ramp characteristic typically provided by proportional valves.
• Small power units can be started against an anti shock relief to provide longer pump life.
• Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
• The main stage orifice is protected against contamination.
• Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Additional Resources

• Tri-Grip Handknob Now Offered From Sun as a Standard Control Option
• QuickDesign with SmartConnect Offers Drag-and-Drop Schematic Tool
• Sun Introduces 'Hybrid' Valves
• CE/TÜV Certified Pressure Relief Valves
• Pressure Relief and Regulating Cartridge Valve Technical Tips
• Pilot Operated, Balanced Poppet Relief Valves
• Sun Expands Corrosion-Resistant Solutions
• Sun Offers Zinc-Nickel Plating for Corrosion Resistance
• Sun Cartridges with EPDM Seals
• Series 4 PLUS Cartridges Offer Higher Flows with Lower Pressure Losses
• Pilot-Operated, Balanced Poppet, Anti Shock Reliefs
• CavitySaver multi-function valves deliver single-cartridge solutions
• 'Soft' Relief Eliminates Pressure Spikes
• Manufacturing Sun Cartridge Cavities
• Pressure Relief and Regulating Valves
• Cavity Information (S-171) and Tooling
• Sun Model Code Explanation; 999-901-334
• Cartridges: Materials of Construction
• Fluid and Temperature Recommendations
• Performance Data
• Sun's Floating Style Screw-In Cartridge
• Units of Measure, Settings, and Conversions

• Patents are pending for this product.