SUN HYDRAULICS
RPCCKCN

***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 RPCCKCN (RPCCKCN) is a pilot-operated, balanced piston relief cartridge designed as a normally closed pressure regulating valve. When the inlet port pressure reaches the valve's setting, it opens to the tank port, throttling flow to maintain regulated pressure. Known for its accuracy and smooth operation, this valve exhibits low pressure rise versus flow and operates quietly with moderate speed. It accepts maximum pressure at port 2, making it suitable for cross-port relief circuits; however, users should consider spool leakage in such applications. The minimum setting for all spring ranges is 75 psi (5 bar), but it's not ideal for load-holding applications due to potential spool leakage. Back pressure on the tank port directly adds to the valve setting at a 1:1 ratio. The main stage orifice is contamination-protected, ensuring reliability in demanding environments. This cartridge can be configured with EPDM seals specifically for systems using phosphate ester fluids; exposure to petroleum-based substances will damage these seals. Sun Hydraulics employs a floating style construction in this model to reduce internal part binding from excessive installation torque or machining variations. The RPCCKCN fits into a T-162A cavity and has a capacity of 12 gpm (45 L/min). Factory pressure settings are established at 4 gpm (15 L/min) with a maximum operating pressure of 5000 psi (350 bar). Its typical response time is 10 ms, with maximum valve leakage at 110 SUS being 2 in\u00b3/min (30 cc/min). Installation requires specific torques for different components: valve installation torque is between 20-25 lbf\u00b7ft (27-33 Nm), and locknut torque is between 80-90 lbf\u00b7in (9-10 Nm). The adjustment screw has an internal hex size of 5/32 in., while the locknut hex size is 1/2 in., facilitating easy adjustments up to five clockwise turns for increased settings.