求：737NG空调里的流量控制关断活门工作详解

星空 · 发表于 2014-9-25 23:07:34

求：737NG空调里的流量控制关断活门工作详解
流量控制关断活门FLOW CONTROL AND SHUTOFF VALVE，在自动，高流量，APU高流量情况下的工作情况是怎样的，求高手解答！！
apu高流量2 - 副本 - 副本.jpg

Mr.Shan · 发表于 2014-9-28 00:08:49

When the pack switch is in the AUTO or HIGH position, solenoid
C receives power to the open coils. The pressurized air flows to
the actuator. It pushes against spring force in the actuator to
open the butterfly plate (valve open). When the valve opens, air
flows to the static pressure sense port and the downstream
(total pressure) sense port.

When the pack switch is in the HIGH position, solenoid B deenergizes
(high flow mode). Actuator air flows to the APU/high
flow servo. The high flow servo has a strong bias to close. This
lets more air pressure go to the valve actuator. This increases
airflow. High flow mode is approximately 80 ppm.

The APU high flow mode energizes solenoid A. The APU/high
flow servo has one more actuating piston than high flow. This
gives a higher spring bias to close the servo. This lets more
pressure go to the valve actuator. APU/high flow mode has an
airflow rate of 100 ppm.

手册25-00-00

wjk560236 · 发表于 2014-9-28 09:50:33

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[21空调] 求：737NG空调里的流量控制关断活门工作详解

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