该阀一般安装在气缸与换向阀之间靠近气缸的管路上，使气缸的排气不经换向阀排出，达到提高气缸运动速度的目的。 This kind of valve is pipeline between the air cylinder and directional valve, closer to cylinder, so that air in cylinder is exhausted through it rather than through the directional valve for the purpose of rasing the speed of cylinder operations.
