附件24.5 maximum. (4).In the speed-regulating circuit of variable displacement pump-variable displacement motor,for both situations of higher output torque at lower speed and higher output power at higher speed,first the displacement of motor is set to the maximum at low speeds and the speed is regulated by variable displacement pump;Secondly,at high speeds the displacement of pump is kept at maximal and the speed is regulated by variable displacement motor. (5)The pressure of hydraulic system depends on th 3.Answer the questions (1)Why speed-regulating valve can keep constant movement velocity of actuator stable? Referenced answers:Refer to the answers on the pages from 151 to 152 in your textbook (2)What are the characteristics of plunger cylinders? Referenced answers:Refer to the answers on the pages from 111 to 112 in your textbook. (3)Draw the flow-pressure characteristic curve of pressure-limiting variable vane pump and explain what occasion it is applicable to? Referenced answers:Refer to the answers on the pages from 82 to 84 in your textbook. (4)Draw the symbol of the O type three position four way solenoid-operated directional control valve,speed-regulating valve and pressure reducing valve. Referenced answers: 中附件 24.5 maximum. (4). In the speed-regulating circuit of variable displacement pump-variable displacement motor , for both situations of higher output torque at lower speed and higher output power at higher speed , first the displacement of motor is set to the maximum at low speeds and the speed is regulated by variable displacement pump; Secondly, at high speeds the displacement of pump is kept at maximal and the speed is regulated by variable displacement motor . (5) The pressure of hydraulic system depends on the outside load. 3、Answer the questions (1) Why speed-regulating valve can keep constant movement velocity of actuator stable？ Referenced answers: Refer to the answers on the pages from 151 to 152 in your textbook. (2) What are the characteristics of plunger cylinders？ Referenced answers: Refer to the answers on the pages from 111 to 112 in your textbook. (3) Draw the flow- pressure characteristic curve of pressure-limiting variable vane pump and explain what occasion it is applicable to? Referenced answers: Refer to the answers on the pages from 82 to 84 in your textbook. (4) Draw the symbol of the O type three position four way solenoid-operated directional control valve, speed-regulating valve and pressure reducing valve. Referenced answers: 3