Lubricating grease gun

A grease gun includes a body having first and second chambers, first and second pistons within the first and second chambers, primary and secondary grease passages, a grease outlet, and an actuator. Actuation of the actuator by a user causes the first and second pistons to move within the first and second chambers. The body may also include a pressure sensitive spool that allows the grease gun to move from a high flow/low pressure operation to a high pressure/low flow operation when there is a grease plug that causes an increase in pressure in the body. 本发明公开了一种润滑脂枪，包括主体，该主体具有第一腔室和第二腔室、在第一腔室和第二腔室内的第一活塞和第二活塞、一级润滑脂通道和二级润滑脂通道、润滑脂出口、和致动器。用户对致动器的致动致使第一活塞和第二活塞在第一腔室和第二腔室内移动。主体还可以包括压敏阀芯，当存在导致主体中的压力增加的润滑脂杜塞时，该压敏阀芯允许润滑脂枪从高流量/低压操作移动到高压/低流量操作。