QF28 full-load sensing multi-way directional control valve is a newly developed patent product of our company. It follows the working principle and various technical indexes of the hydraulic system of all-hydraulic crane with international advanced level. It successfully meets the development needs of all-hydraulic cranes such as QY20~QY80 and crawler cranes below 80T in China, especially its excellent performance of full load sensing function fully improves crane control accuracy and minimizes energy loss, which can be called energy-saving products with high-precision control. Pressure: 31.5MPa, and maximum flow rate: 400L/min. QF28 full load sensing multi-way directional valves are now widely used in hydraulic systems of cranes, crawler cranes, rotary drilling rigs and large marine machinery.