SUN HYDRAULICS
FQIAXAV

***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 FQIAXAV (FQIAXAV) is a flow fuse cartridge designed to ensure the stability of hydraulic actuators in the event of a hose or line break. This valve facilitates flow to and from the actuator but will close instantly if the flow exceeds a pre-set value, preventing uncontrolled actuator movement. It is crucial for customers to specify their desired flow rating when ordering, as factory settings are within 10% of this request. The valve automatically resets when pressures at both ports equalize. To avoid false tripping, the flow setting should be at least 25% above the maximum normal system flow. This spool-type valve allows for some leakage, which may cause slight actuator drift. It features Sun's floating style construction that minimizes binding risks due to excessive installation torque or machining variations. The FQIAXAV fits into cavity T18A and belongs to series 4, with a capacity of up to 50 gpm (200 L/min) and can withstand a maximum operating pressure of 5000 psi (350 bar). The valve's maximum leakage is rated at 5 in\u00b3/min (80 cc/min) at 1000 psi (70 bar). It 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). Weighing in at approximately 2.90 lb (1.30 kg), it uses a Viton seal kit with part number 990018006. Sun Hydraulics advises against using this product for oil loss prevention or fire protection as it is specifically engineered for preventing uncontrolled actuator movement during hose failures. Proper setting selection is critical due to potential transient flows; therefore, sizing should allow room for tuning beyond the typical system flow rate requirements.