Which component restricts the lifting capacity of hoisting equipment?

The pressure relief valve plays a crucial role in regulating the lifting capacity of hoisting equipment. It is designed to prevent excessive pressure from building up in the hydraulic system, which could lead to equipment failure or accidents. By monitoring the pressure levels, the relief valve ensures that the hoisting equipment operates within its safe limits. If the pressure exceeds a predetermined level, the valve opens to release hydraulic fluid, thereby reducing the pressure and maintaining safe operational conditions. This safety mechanism ultimately restricts the lifting capacity to prevent overload and ensure the safe handling of loads.

Other components, such as the safety latch, hydraulic fluid, and load indicator, serve important functions but do not directly limit the lifting capacity in the same way that a pressure relief valve does. The safety latch prevents accidental disengagement of the load, hydraulic fluid is necessary for operation but does not limit capacity, and the load indicator provides information about the weight being lifted but does not physically restrict the lifting capacity itself.