• 1. open return system: 开式回水系统
• 2. open return steam heating system: 直接蒸汽供热系统
• 3. open-type condensate return system: 开式凝结水回收系统

• 1.Open system is the pump suction from the tank, the oil through a variety of control valves, the drive hydraulic actuators, valve oil return back for another fuel tank.
  开式系统是指液压泵从油箱吸油，油经各种控制阀后，驱动液压执行元件，回油再经过换向阀回油箱。
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