SUN HYDRAULICS
NCFBKBN

***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 NCFBKBN (NCFBKBN) is a needle valve with a reverse flow check, designed for precise flow regulation in hydraulic systems. This valve features an infinitely adjustable orifice, allowing users to control flow from fully closed up to the maximum orifice diameter. It includes an integral high-capacity check valve that permits unrestricted flow from port 2 to port 1, although it is not pressure compensated. The NCFBKBN model is part of the 2-port flow control cartridge line, which are interchangeable in terms of flow path and cavity dimensions for a given frame size. However, cartridge extension dimensions may vary. This needle valve operates by regulating flow through the fixed orifice size in proportion 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 variations due to changes in fluid viscosity. Additionally, the Sun floating style construction reduces the risk of internal parts binding due to excessive torque or machining variations. Key specifications include a cavity T-16A series 3 capacity of 30 gpm (120 L/min), maximum operating pressure of 5000 psi (350 bar), and maximum valve leakage at 110 SUS (24 cSt) of 10 drops/min (0.7 cc/min). The valve allows for up to five and a half counterclockwise turns from fully closed to fully open. The installation requires a torque between 150-160 lbf ft (203-217 Nm), with other components requiring specific torque settings as well. The model weighs approximately 1.30 lb (0.60 kg) and uses Viton seals identified by seal kit number 990016006.