Here's why anti-fall valves are important for loaders:
Load Holding:
They prevent the load from drifting down or dropping unexpectedly when the hydraulic system is not actively being controlled. 
Safety:
In the event of a hose burst or other hydraulic failure, the valve will lock the cylinder, preventing the load from falling and potentially causing injury or damage. 
Controlled Motion:
They allow for controlled lowering of the load by regulating the flow of hydraulic fluid, preventing runaway or jerky movements. 
Stability:
By holding the load steady, they contribute to the overall stability of the loader, especially when working on uneven terrain. 
Compliance:
In some regions, the use of load-holding valves is mandated by safety regulations, such as AS 1418.8 / ISO 8643, for machines used as cranes. 
In essence, anti-fall valves act as a critical safety mechanism in hydraulic systems, providing load control and preventing potentially dangerous situations associated with the uncontrolled release of hydraulic pressure