SUN HYDRAULICS
NCGCHDN

***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 NCGCHDN (NCGCHDN) is a needle valve with a reverse flow check, designed for versatile flow regulation applications. This fully adjustable orifice enables precise control of fluid flow, allowing for adjustments from fully closed to the maximum orifice diameter. It features an integral high-capacity check valve that ensures unrestricted flow from port 2 to port 1. Notably, this model is not pressure compensated, meaning the fixed orifice size regulates flow proportional to the square root of the pressure differential across ports 1 and 2. It incorporates a balanced adjustment mechanism that facilitates easy adjustments even under high-pressure conditions. The sharp-edged orifice design effectively minimizes variations in flow due to viscosity changes, while Sun\u2019s floating style construction reduces the risk of internal parts binding due to excessive installation torque or cavity-cartridge machining variations. The NCGCHDN model fits into a Cavity T-18A Series 4 with a capacity of up to 30 gpm (120 L/min) and can withstand a maximum operating pressure of 5000 psi (350 bar). The valve has minimal leakage, with a maximum allowable leakage at 110 SUS (24 cSt) being only 5 drops/min (0.3 cc/min). For installation, the valve requires a torque between 350 - 375 lbf ft (474 - 508 Nm), and it allows for adjustment through up to five full counterclockwise turns from fully closed to fully open. The hex sizes for various components are specified as follows: valve hex size is 1-5/8 in. (41.3 mm), adjustment screw internal hex size is 5/32 in. (4 mm), and locknut hex size is 9/16 in. (15 mm) with a locknut torque range of 80 - 90 lbf in. (9 -10 Nm). Weighing approximately 3 lb (1.35 kg), this model utilizes Viton seals with seal kit number: 990018006 available for maintenance needs.