SUN HYDRAULICS CORP
RPGS8WE
Pressure Control

This valve is a normally closed modulating element that incorporates an integral pilot control cavity. It is a balanced poppet design. The pilot control cavity will accept any T-8A pressure control cartridge. When the pressure at the inlet (port 1) reaches the pilot control cartridge's setting, the poppet element starts to open to tank (port 2), throttling flow to regulate the pressure. The pilot cartridge's setting determines the difference in pressure between port 1 and port 2.

• Because the modulating occurs inside the cartridge, these valves are immune to most of the problems associated with cavitation, namely noise and manifold erosion.
• Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
• Will accept maximum pressure at port 2; suitable for use in cross port relief circuits.
• Valve is relatively insensitive to varying oil temperatures and oil borne contamination.
• Main stage orifice is protected by a 150 micron stainless steel screen.
• Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
• NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control valve should then be installed into the main stage valve to its required torque value.
• The -8 control option allows the pilot control valve to be incorporated directly into the end of the relief cartridge via the T-8A cavity. These pilot control cartridges are sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot Control Cartridges.
• All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
• 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

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

• Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at point of use.