SUN HYDRAULICS
RPKCKKN
$401.10 USD
- SUN HYDRAULICS
- Material:RPKCKKN
- Model:RPKC-KKN
- Summary:Cartridge
Due to extremely high demand, please call 888-905-7411 for availability
***Disclaimer: The following summary contains information gathered from various sources such as product descriptions, technical specifications and catalogs. While efforts have been made to provide accurate details, inaccuracies may occur. It is advised to verify all information by contacting Sun Hydraulics directly.***
The Sun Hydraulics RPKCKKN (RPKCKKN) is a pilot-operated, balanced-piston relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve opens to tank port 2 when the inlet port 1 pressure reaches the preset level, effectively throttling flow to maintain consistent pressure. Known for its accuracy and smooth operation, the RPKCKKN offers low pressure rise versus flow and operates quietly with moderate speed. It can handle maximum pressure at port 2, making it suitable for cross-port relief circuits, though spool leakage should be considered in such applications. The main stage orifice is safeguarded by a 150-micron stainless steel screen. However, it is not recommended for load-holding applications due to spool leakage. The valve's backpressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. All two-port relief cartridges, excluding pilot reliefs, are interchangeable in terms of flow path and cavity size within a given frame size. The RPKCKKN can be configured with EPDM seals for compatibility with phosphate ester fluids but is incompatible with petroleum-based fluids or lubricants due to potential seal damage. Featuring corrosion-resistant options identified by model code suffixes AP or LH, this cartridge uses Sun's floating style construction to minimize internal binding risks from excessive installation torque or machining variations. It fits into cavity T-18A and belongs to Series 4 with a capacity of 200 gpm (760 L/min). The factory pressure settings are established at 4 gpm (15 L/min), with a maximum operating pressure of 5000 psi (350 bar) and typical response time of 10 ms. Maximum valve leakage stands at 5 in\u00b3/min at 1000 psi (80 cc/min at 70 bar). The adjustment requires five clockwise turns to increase settings, with specific torque requirements for installation and locknut adjustments provided.
The Sun Hydraulics RPKCKKN (RPKCKKN) is a pilot-operated, balanced-piston relief cartridge designed for precise pressure regulation in hydraulic systems. This normally closed valve opens to tank port 2 when the inlet port 1 pressure reaches the preset level, effectively throttling flow to maintain consistent pressure. Known for its accuracy and smooth operation, the RPKCKKN offers low pressure rise versus flow and operates quietly with moderate speed. It can handle maximum pressure at port 2, making it suitable for cross-port relief circuits, though spool leakage should be considered in such applications. The main stage orifice is safeguarded by a 150-micron stainless steel screen. However, it is not recommended for load-holding applications due to spool leakage. The valve's backpressure on tank port 2 directly adds to the valve setting at a 1:1 ratio. All two-port relief cartridges, excluding pilot reliefs, are interchangeable in terms of flow path and cavity size within a given frame size. The RPKCKKN can be configured with EPDM seals for compatibility with phosphate ester fluids but is incompatible with petroleum-based fluids or lubricants due to potential seal damage. Featuring corrosion-resistant options identified by model code suffixes AP or LH, this cartridge uses Sun's floating style construction to minimize internal binding risks from excessive installation torque or machining variations. It fits into cavity T-18A and belongs to Series 4 with a capacity of 200 gpm (760 L/min). The factory pressure settings are established at 4 gpm (15 L/min), with a maximum operating pressure of 5000 psi (350 bar) and typical response time of 10 ms. Maximum valve leakage stands at 5 in\u00b3/min at 1000 psi (80 cc/min at 70 bar). The adjustment requires five clockwise turns to increase settings, with specific torque requirements for installation and locknut adjustments provided.
Pilot-operated, balanced-piston relief cartridges are normally closed pressure regulating valves. When the pressure at the inlet (port 1) reaches the valve setting, the valve starts to open to tank (port 2), throttling flow to regulate the pressure. These valves are accurate, have low pressure rise vs. flow, they are smooth and quiet, and are moderately fast.
- Will accept maximum pressure at port 2; suitable for use in cross port relief circuits. If used in cross port relief circuits, consider spool leakage.
- Main stage orifice is protected by a 150 micron stainless steel screen.
- Not suitable for use in load holding applications due to spool leakage.
- Back pressure on the tank port (port 2) is directly additive to the valve setting at a 1:1 ratio.
- All 2-port relief cartridges (except pilot reliefs) are physically and functionally interchangeable (same flow path, same cavity for a given frame size).
- 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.
- W and Y controls (where applicable) can be specified with or without a special setting. When no special setting is specified, the valve is adjustable throughout its full range using the W or Y control. When a special setting is specified, this setting represents the maximum setting of the valve.
- Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
- 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.
| Cavity | T-18A |
| Series | 4 |
| Capacity | 200 gpm760 L/min. |
| Factory Pressure Settings Established at | 4 gpm15 L/min. |
| Maximum Operating Pressure | 5000 psi350 bar |
| Response Time - Typical | 10 ms10 ms |
| Maximum Valve Leakage at 110 SUS (24 cSt) | 5 in³/min.@1000 psi80 cc/min.@70 bar |
| Adjustment - Number of Clockwise Turns to Increase Setting | 55 |
| Valve Hex Size | 1 5/8 in.41,3 mm |
| Valve Installation Torque | 350 - 375 lbf ft474 - 508 Nm |
| Adjustment Screw Internal Hex Size | 5/32 in.4 mm |
| Locknut Hex Size | 9/16 in.15 mm |
| Locknut Torque | 80 - 90 lbf in.9 - 10 Nm |
| Model Weight | 2.50 lb1,15 kg |
| Seal kit - Cartridge | Viton: 990-018-006 |
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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
- Sun's Floating Style Screw-In Cartridge
- Units of Measure, Settings, and Conversions
- Cavity Information (S-171) and Tooling
- Sun Model Code Explanation; 999-901-334
- Cartridges: Materials of Construction
- Fluid and Temperature Recommendations
- Performance Data
