SUN HYDRAULICS
FDFAHAN

***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 FDFAHAN (FDFAHAN) is a fully adjustable, pressure-compensated flow control valve with a reverse flow check, designed to provide precise flow regulation for both meter-in and meter-out applications. This product is particularly suited for scenarios where there may be significant pressure fluctuations, as it offers infinite adjustability from nearly closed to its maximum flow capacity. The valve includes an integral high-capacity check valve that allows unrestricted flow from port 2 to port 1. All 2-port flow control cartridges in this series are interchangeable in terms of flow path and cavity size, though cartridge extension dimensions may vary. This model features a balanced adjustment mechanism that facilitates easy adjustments even under high pressures, and its sharp-edged orifice design minimizes variations due to viscosity changes. The minimum leakage rate is .2 gpm when the adjustment mechanism is fully closed. It is important to note that cartridges with EPDM seals are compatible only with systems using phosphate ester fluids; exposure to petroleum-based fluids can damage these seals. The FDFAHAN fits into a T18A cavity and belongs to Series 4, offering a capacity of up to 50 gpm (200 L/min) and a maximum operating pressure of 5000 psi (350 bar). The adjustment range spans 5.5 counterclockwise turns from fully closed to fully open. Installation requires specific torque settings: valve installation torque ranges between 350-375 lbf ft (475-508 Nm), and locknut torque ranges between 80-90 lbf in (9-10 Nm). The model weighs approximately 3.30 lb (1.50 kg), and the Viton seal kit for the cartridge is identified by part number 990018006.