Supply and discharge adjusting apparatus and supply and discharge adjusting system

摘要

A supply and discharge adjusting apparatus (3) includes: a main unit (30) formed with a main passage (331) to communicate a first port (31) and a second port (32); and a speed controller (5) including a needle valve (7) arranged to adjust a discharge amount of a fluid flowing in the main passage (331) with respect to the main unit (30). A bypass passage (332) is formed in the main unit (30) with respect to the main passage (331). The apparatus further includes a relief valve (6) arranged to adjust a discharge amount of a fluid flowing in the bypass passage (332).