上海—50型拖拉机的液压系统为整体式,它由油泵、分配器、油缸及操纵机构组成,其油路详见图。为防止液压系统过载,保护油泵和拖拉机安全工作,上海—50型拖拉机在油泵通往油缸的油路上并联了一个球式安全阀。但由于一些用户不能正确使用,致使球式安全阀屡屡损坏。本文着重谈一谈上海—50型拖拉机液压系统中球式安全阀的使用和调整。 Shanghai -50 tractor hydraulic system as a whole, which consists of pumps, distributors, fuel tanks and control mechanisms, the oil details shown in Figure. In order to prevent the overload of the hydraulic system and protect the safety work of the pump and the tractor, Shanghai -50 tractor has a spherical safety valve in parallel with the oil path leading from the oil pump to the oil cylinder. However, due to some users can not be properly used, resulting in repeated damage to the ball valve. This article focuses on talk about Shanghai-50 tractor hydraulic system in the use of spherical safety valve and adjust.