SUN HYDRAULICS
NCFCKDN

***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 NCFCKDN (NCFCKDN) is a needle valve with a reverse flow check, designed to provide precise flow regulation in hydraulic systems. This fully adjustable orifice allows for infinite adjustments from fully closed to the maximum orifice diameter, making it versatile for various applications. The valve features an integral high-capacity check valve that ensures unrestricted flow from port 2 to port 1, although it is not pressure compensated. It is compatible with all 2-port flow control cartridges of the same frame size and cavity, though extension dimensions may differ. The non-compensating nature of needle valves means that the fixed orifice size regulates flow proportionate to the square root of the pressure differential across ports 1 and 2. A balanced adjustment mechanism facilitates easy adjustments even under high pressures, while a sharp-edged orifice design minimizes flow variations due to viscosity changes. The Sun floating style construction reduces the risk of internal parts binding caused by excessive installation torque or machining variations in the cavity and cartridge. Key specifications include a capacity of 15 gpm (60 L/min) and a maximum operating pressure of 5000 psi (350 bar). The maximum valve leakage at 110 SUS (24 cSt) is limited to 5 drops/min (0.3 cc/min). Adjustment is achieved with up to 5.5 counterclockwise turns from fully closed to fully open, using an internal hex screw size of 5/32 inches (4 mm). The valve hex size measures at 1-1/4 inches (31.8 mm), with an installation torque requirement between 150-160 lbf ft (203-217 Nm). Additionally, it includes a locknut hex size of 9/16 inches (15 mm) with a locknut torque specification of 80-90 lbf in (9-10 Nm). The model weighs approximately 1.30 lb (0.60 kg) and utilizes Viton seal kits for enhanced durability.