比例控制阀是近年来出现的一种性能介于普通开关式控制阀和电液伺服阀之间的新型液压控制元件,它具有电液伺服阀的基本性能,能够连续地、按比例地控制回路的压力、流量和方向,又具有普通控制阀结构简单、成本低廉的优点。比例阀分手动控制和电液控制两类。渔业机械尤其是渔船渔捞机械,经常处于恶劣的变工况条件下工作,因此,液压渔捞机 Proportional control valve is a new type of hydraulic control element which has appeared in recent years between normal switch control valve and electro-hydraulic servo valve. It has the basic performance of electro-hydraulic servo valve and can control the circuit continuously and proportionally The pressure, flow and direction, but also has the advantages of simple control valve structure, low cost. Proportional valve sub-manual control and electro-hydraulic control two categories. Fishery machinery, especially fishing vessels Fishing machinery, often in harsh conditions working under variable conditions, therefore, hydraulic fishing machine