SUN HYDRAULICS
FCFBKBN

***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 FCFBKBN (FCFBKBN) is a fixed-orifice, pressure-compensated flow control valve with reverse flow check designed for precise flow regulation in meter-in or meter-out applications. This valve is particularly useful in scenarios where there may be wide pressure fluctuations. It features an integral high-capacity check valve that allows unrestricted flow from port 2 to port 1. The flow setting of the FCFBKBN is specified by the user and set at the factory, with a factory-set flow rating accuracy within 10% of the requested setting. Additionally, it offers a tunable control option allowing for a 20% variation from the nominal factory preset flow, adjustable via an internal hex screw. The FCFBKBN model incorporates Sun's floating style construction to minimize internal part binding due to excessive installation torque or machining variations. It uses a sharp-edged orifice design to reduce flow variations caused by changes in viscosity. The cartridge is interchangeable across all two-port flow control cartridges of the same frame size, although extension dimensions from the mounting surface may differ. Key specifications include a cavity size of T-18A, series 4 capacity of up to 50 gpm (200 L/min), and a maximum operating pressure of 5000 psi (350 bar). The valve has a hex size of 1-5/8 inches (41.3 mm) and requires an installation torque between 350 and 375 lbf ft (475 to 508 Nm). The adjustment screw has an internal hex size of 5/32 inches (4 mm), and the locknut requires a torque between 80 and 90 lbf in (9 to 10 Nm). The model weighs approximately 1 lb (0.45 kg) and uses Viton seals with cartridge seal kit number 990018006.