SUN HYDRAULICS
NEEDLE CARTRDGE
NFFDLIN

***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 NFFDLIN (Material Number: NFFDLIN) is a versatile needle valve designed for precise flow regulation in hydraulic systems. This fully adjustable orifice valve allows for infinite adjustment from fully closed to the maximum orifice diameter, making it suitable for use as both a flow control and a shutoff valve. The NFFDLIN model is not pressure compensated, meaning the flow regulation is directly proportional to the square root of the pressure differential across its ports. It features a balanced adjustment mechanism that facilitates easy adjustments even under high pressures, and its sharp-edged orifice design minimizes variations in flow due to changes in fluid viscosity. This needle valve is bidirectional but is optimized for flow from port 1 to port 2, ensuring interchangeability with other flow controls. Notably, there is no leakage when the valve is shut off completely. The cartridge's dimensions are standardized for interchangeability with other 2-port flow control cartridges of the same frame size, though extension dimensions may vary. The NFFDLIN model has a capacity of 140 gpm (530 L/min) and can operate at a maximum pressure of 5000 psi (350 bar). The adjustment mechanism allows for up to 5.5 counterclockwise turns from fully closed to fully open. Installation requires specific torque settings: 350-375 lbf ft (474-508 Nm) for the valve and 80-90 lbf in (9-10 Nm) for the locknut. The model weighs approximately 3 pounds (1.35 kg) and uses Viton seals; however, EPDM seals are available for systems using phosphate ester fluids, with caution against exposure to petroleum-based substances which can damage these seals.