The lubrication system of a gyratory crusher is required to supply oil to two oil circuits, namely the MPS oil cylinder and the lower frame bushing. However, these two circuits face working conditions such as a large difference in pressure loss, pressure loss varying with temperature and oil viscosity, different flow requirements, and a higher lubrication priority for the MPS oil cylinder circuit. Traditional throttle valves cannot meet the requirements due to inadequate flow stability. This paper introduces the composition and working principle of the lubrication system of gyratory crushers, analyzes the flow requirements of the two oil circuits, and designs a novel manifold valve block: Circuit A (MPS oil cylinder circuit) adopts a speed control valve composed of a differential pressure reducing valve and a fixed throttle plug connected in series, and an overflow valve is installed in Circuit B (lower frame bushing circuit) to ensure the working pressure of the differential pressure reducing valve. This design achieves priority lubrication of the MPS oil cylinder circuit, and the flow rates of the two oil circuits have high stability independent of external loads and oil temperature fluctuations. Taking a certain specification of gyratory crusher of an enterprise as an example, when the total lubricating oil flow rate is 300L/min, the flow rates of Circuit A and Circuit B stably reach 170L/min and 130L/min respectively. This guarantees prioritized lubrication of Circuit A and sufficient lubrication for both target points, which significantly improves the operation stability, reliability and economy of the gyratory crusher.