SUN HYDRAULICS
FQGAXBN

***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 FQGAXBN (FQGAXBN) is a flow fuse cartridge designed to maintain the position of a hydraulic actuator in the event of a hose or line break. This valve allows fluid to flow to and from the actuator but instantly closes if the flow exceeds a predetermined setting, effectively preventing uncontrolled actuator movement. The valve is highly sensitive and responds rapidly to any transient flow above its set threshold, requiring careful calibration during installation. Customers must specify their desired flow rating when ordering, with factory settings guaranteed within 10% of the requested specification. The FQGAXBN features a spool-type design, which may result in some leakage and potential actuator drift. To minimize binding due to excessive torque or machining variations, it incorporates Sun's floating style construction. It fits into a T16A cavity and belongs to Series 3, offering a capacity of up to 25 gpm (95 L/min) and withstanding maximum operating pressures of 5000 psi (350 bar). The valve exhibits maximum leakage at 4 in\u00b3/min at 110 SUS (24 cSt) under pressure conditions of 1000 psi (70 bar). Installation requires torque between 150-160 lbf ft (203-217 Nm), with a compact weight of just .70 lb (.30 kg). This cartridge is not intended for use in oil loss prevention or fire protection scenarios; instead, it is specifically engineered for maintaining control during hose failures by being set above typical system flows, often around 50% higher than normal operation levels. Proper selection and setting are crucial as transient flows can inadvertently trigger the valve if not correctly calibrated.