Chapter 11 Circuits constant pressure systems constant horsepower

Chapter 11 Circuits

定壓力系統(constant pressure systems)： 定功率系統(constant horsepower system) ：

負荷感測系統(load-sensing system)：

Other basic circuits(其他基本迴路)： ‧卸載迴路(unloading circuits)： ‧卸載迴路： (Ⅰ)

‧卸載迴路： Ⅰ：rapid traverse at low pressure Ⅱ：slow advance at high pressure (left pump is unloaded) (Ⅰ)

‧順序迴路： Position(1): (S 1) clamp drill Position(2): (S 2) drill retracts clamp retracts ‧再生迴路： (Ⅱ)

‧同步迴路： Position(1): Extension ‧with replenishing circuit(補充油路) if cylinder 1 reaches limit switch first valve A is energized and supplies additional fluid to cylinder 2 Position(2): Retraction if cylinder 2 reaches limit switch first valve A supplies fluid to cylinder 1 Fluid motor speed pressure pilot operated 2 way control valve: closed pressure (Ⅲ)

‧安全迴路： ‧overload protection: (Ⅲ)

‧安全迴路： ‧pilot shutoff valve: open cylinder retracts (main control valve: position(1) ) ‧both palm valves depressed cylinder extends (main control valve: position(2) )

‧open center circuits:

‧open center circuits:

‧closed center circuits: