SUN HYDRAULICS
NCGCHBN

***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 NCGCHBN (NCGCHBN) is a needle valve with a reverse-flow check, designed as an adjustable orifice to regulate flow efficiently. It allows for infinite adjustment from fully closed to its maximum orifice diameter and features an integral high-capacity check valve that enables unrestricted flow from port 2 to port 1. This model is not pressure compensated, meaning the fixed orifice size will control flow based on the square root of the pressure differential across ports 1 and 2. The valve boasts a balanced adjustment mechanism for easy manipulation even under high pressures, and its sharp-edged orifice design minimizes flow variations due to changes in viscosity. Constructed with Sun's floating style design, it reduces the risk of internal parts binding due to excessive installation torque or machining variations in cavity-cartridge interfaces. The NCGCHBN fits into a Cavity T-18A Series 4 and has a capacity of 30 gpm (120 L/min) with a maximum operating pressure of 5000 psi (350 bar). It features minimal leakage at maximum conditions, with only 5 drops/minute (0.3 cc/min). The valve allows for up to 5.5 counterclockwise turns from fully closed to fully open and requires specific torques for installation: a valve hex size of 1-5/8 inches (41.3 mm) with an installation torque range of 350 - 375 lbf ft (474 - 508 Nm), an adjustment screw internal hex size of 5/32 inches (4 mm), and a locknut hex size of 9/16 inches (15 mm) requiring torque between 80 - 90 lbf in (9 -10 Nm). The model weighs approximately 3 pounds (1.35 kg) and uses Viton seal kits, specifically part number 990018006, ensuring durability and compatibility with hydraulic systems.