SUN HYDRAULICS
NFDCOBN

***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 NFDCOBN (NFDCOBN) is a versatile needle valve designed for precise flow regulation in hydraulic systems. This fully adjustable orifice allows for infinite adjustment from fully closed to the maximum orifice diameter, making it suitable for use as a flow control or shutoff valve. The NFDCOBN model features a balanced adjustment mechanism that facilitates easy adjustments even at high pressures, and its sharp-edged orifice design minimizes flow variations due to viscosity changes. The valve operates bidirectionally, with the preferred flow path being from port 1 to port 2 for compatibility with other flow controls. With a maximum operating pressure of 5000 psi (350 bar) and a capacity of 12 gpm (45 L/min), this cartridge is physically and functionally interchangeable with other 2-port flow control cartridges of the same frame size, though extension dimensions may vary. It is important to note that the NFDCOBN is non-pressure compensated; thus, the fixed orifice size regulates flow proportionally to the square root of the pressure differential across ports 1 and 2. The valve's construction includes EPDM seals suitable for systems using phosphate ester fluids, but these seals are not compatible with petroleum-based fluids. Installation requires specific torque settings: valve installation torque ranges from 45-50 lbf ft (61-68 Nm), while locknut torque ranges from 80-90 lbf in (9-10 Nm). The NFDCOBN model weighs approximately .60 lb (.30 kg) and requires an internal hex size of 5/32 in (4 mm) for adjustment screw operation. For maintenance, a Viton seal kit is available under part number 990203006.