Pilot operated, balanced piston relief valve Capacity: 25 gpm (95 L/min.) Functional Group: Products : Cartridges : Relief : 2 Port : Pilot Operated, Balanced Piston Model: RPEC-KDN Product Description 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. Download Technical Features 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). Stainless steel cartridge options P or W are intended for use within corrosive environments with all external components manufactured in stainless steel or titanium. Internal working components remain the same as the standard valves. 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. Technical Data U.S. Units Metric UnitsModel Weight 0.38 lb. 0.17 kg.Cavity T-10ACapacity 25 gpm 95 L/min.Adjustment - Number of Clockwise Turns to Increase Setting 5 Factory Pressure Settings Established at 4 gpm 15 L/min.Maximum Operating Pressure 5000 psi 350 barMaximum Valve Leakage at 110 SUS (24 cSt) 2 in³/min.@1000 psi 30 cc/min.@70 barResponse Time - Typical 10 msSeries (from Cavity) Series 1Valve Hex Size 7/8 in. 22,2 mmValve Installation Torque 30 - 35 lbf ft 45 - 50 NmAdjustment Screw Hex Socket Size 5/32 in. 4 mmAdjustment Nut Hex Size 9/16 in. 15 mmAdjustment Nut Torque 108 lbf in. 12 NmSeal Kits Buna: 990-010-007 Seal Kits Viton: 990-010-006 RPEC-KDN Control Adjustment Range External Material/Seal Material K Handknob +5.00 D25 - 800 psi (1,7 - 55 bar), 400 psi (30 bar) Standard Setting+1.00 N Buna-N +0.00If the material/seal is P, the control must be L or CIf the material/seal is W, the control must be L or C* Special Setting required, specify at time of order Customer specified setting stamped on hex $1.10Related Models RPEC8 Explanation of Sun cartridge control options - US units.Explanation of Sun cartridge control options - metric units. Two-piece, floating cartridge construction. Copyright © 2007-2008 Sun Hydraulics Corporation. All rights