SUN HYDRAULICS
FQIAXBN

***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 FQIAXBN (FQIAXBN) 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 flow to and from the actuator but closes instantly if the flow from the actuator exceeds the valve's set limit. Notably, this rapid response makes it sensitive to any transient flow above its setting. Customers must specify a flow rating, with factory-set ratings within 10% of the requested setting. The valve closes when flow from port 1 to port 2 exceeds its setting and resets when pressures at both ports equalize. It is recommended that the flow setting be at least 25% above maximum normal system flow. The FQIAXBN is a spool-type valve, meaning some leakage and potential actuator drift may occur. It incorporates Sun's floating style construction to minimize internal parts binding due to excessive installation torque or cavity/cartridge machining variations. This model fits into cavity T18A, belongs to Series 4, and has a capacity of 50 gpm (200 L/min). It can operate at a maximum pressure of 5000 psi (350 bar) with maximum valve leakage at 110 SUS (24 cSt) being 5 in\u00b3/min (80 cc/min). The valve's hex size is 1-5/8 inches (41.3 mm), with an installation torque range between 350 and 375 lbf-ft (475 to 508 Nm). Weighing in at approximately 2.90 lb (1.30 kg), it uses Viton seals for optimal performance. Flow fuses like this one are not intended for preventing oil loss or providing fire protection; they are specifically designed to prevent uncontrolled actuator movement in case of hose failure. Proper selection and adjustment are crucial for effective operation without false tripping due to transient flows exceeding settings during normal operation.