Balance valve and engineering machine

The invention relates to a balance valve and an engineering machine. The balance valve comprises a loading cavity, an oil inlet cavity and a balance valve body core, wherein a first oil duct for communicating the loading cavity with the oil inlet cavity is arranged in the balance valve; the balance valve body core is provided with a second oil duct for communicating the loading cavity with the oil inlet cavity; when the balance valve is reversely opened, the initial section of the motion stroke of the balance valve body core is a cover stroke; and in the cover stroke, the first oil duct is closed, so that oil flows back through the second oil duct, wherein the through flow of the second oil duct is smaller than that of the first oil duct. In the cover stroke, the first oil duct is closed, the oil flows back through the second oil duct, and the through flow of the second oil duct is smaller than that of the first oil duct, thereby preventing instantaneous change of the pressure in the balance valve loading cavity and enhancing the jogging property of the system. The balance valve can avoid frequent opening and closing and prevent the hoisting system from being subjected to action impact, whipping or other phenomena, thereby enhancing the stability of the balance valve and system.