3215394 Modulating shutoff valve (MSOV)

调节关断活门

一、名称

Modulating shutoff valve (MSOV)

调节关断活门

二、件号

3215394-3~8

三、章节号

29-20-17

四、适用机型

B777

五、系统

29 HYDRAULIC POWER

液压

六、安装位置

Zone 197, Aft Wing-to-Body Fairings, Left

机翼后侧到机身整流罩，左侧

七、部件原理

1.The MSOV has these components:

– Butterfly valve

– Dual coil solenoid (auto and continuous run coils)

-Pneumatic actuator.

2.The secondary speed control controls the position of the MSOV butterfly valve. The pneumatic speed sensor on the TGA sends a pulsed pneumatic signal in proportion to turbine speed. This signal goes to the secondary speed control fluidic circuit. This pneumatic circuit controls the MSOV pneumatic actuator.

1.MSOV有以下部件：

-蝶板组件

-双线圈电磁阀（自动和连续运行线圈）

-气动作动器。

2.二级速度控制装置控制MSOV蝶板的位置。TGA上的气动速度传感器发送与涡轮速度成比例的脉冲气动信号。该信号进入二级速度控制装置流体回路。该气动回路控制MSOV气动作动器。

A. modulating shutoff valve

调节关断活门

(1) The primary function of the modulating and shutoff valve is to prevent air flow by closing or to keep a constant downstream pressure that changes in relation to the external air pressure. The secondary function is to change downstream pressure as necessary when an external pneumatic signal is received. In the modulating mode, a remotely-mounted bleed-off device controls the pressure to the valve opening chamber and opens the chamber to set the butterfly element. The valve opens when electrical power is supplied by one or the other of two coils connected to the solenoid valve. When electrical power is off the valve will close. The schematics are shown with no pressure or power supplied.

调节和关断活门的主要功能是通过关闭或保持恒定的下游压力来防止气流流动，而下游压力的变化与外部气压有关。次要功能是在收到外部气动信号时根据需要改变下游压力。在调节模式下，远程安装的排气装置控制活门开启腔的压力，并打开活门开启腔以设置蝶板元件。当连接到电磁阀的两个线圈中的一个或另一个提供电力时，活门打开。断电时，活门关闭。原理图显示的是无压力或无电源的情况。

(2) Air inlet pressure moves through a downstream facing probe to the closed solenoid. When electrical power is supplied to the solenoid valve, the ball moves to the opposite opening from that shown. Air inlet pressure continues through the supply port to a remotely-mounted bleed-off device and back to the actuator opening chamber through the control port. When in the primary mode, the bleed-off device is off. When control pressure is sufficient to compress the actuator spring, the butterfly element moves toward the open position. As the butterfly opens, air inlet pressure goes around the butterfly to the downstream sense connection and to the actuator closing chamber. The actuator opening diaphragm has a larger area than the closing piston. Because of the larger net opening area, an opening force results even when pressure is supplied to the actuator closing chamber.

空气入口压力通过一个面向下游的探头移动到关闭的电磁阀。向电磁阀供电时，球会移动到与图示相反的开口。进气压力继续通过供气口到达远程安装的排气装置，然后通过控制口回到作动器的开启腔。在主要模式下，排气装置处于关闭状态。当控制压力足以压缩致动器弹簧时，蝶板元件向打开位置移动。随着蝶板元件的打开，进气压力绕过蝶板元件到达下游感应连接处和作动器关闭腔。作动器打开膜片的面积大于关闭活塞的面积。由于净开启面积较大，即使向作动器关闭腔提供压力，也会产生开启力。

(3) When the solenoid is energized,control pressure goes to the actuator opening chamber and the butterfly element moves toward open. Downstream pressure increases with increasing inlet pressure until the force generated by the downstream pressure in the actuator closing chamber, in combination with the actuator closing spring, balances the pressure in the opening chamber. If the downstream pressure continue to increase, the force balance would be upset in the closing direction and the butterfly would move toward the closed position to decrease the level of the downstream pressure. When the downstream pressure decreases, the force balance is upset in the opening direction. This causes the butterfly element to move toward the open position to put back the downstream pressure to the necessary value.

当电磁阀通电时，控制压力进入作动器开启腔，蝶板元件向开启方向移动。下游压力随着入口压力的增加而增加，直到下游压力在作动器关闭腔中产生的力与作动器关闭弹簧相结合，平衡了开启腔中的压力。如果下游压力继续增加，关闭方向的力平衡将被打破，蝶板将向关闭位置移动，以降低下游压力水平。当下游压力降低时，力平衡在开启方向被打破。这将导致蝶板元件向开启位置移动，使下游压力恢复到所需值。

(4) In the modulating mode the bleed-off device modulates the control pressure to the valve opening chamber to position the butterfly element for the required downstream pressure. When downstream pressure increases, the bleed-off device opens to vent control pressure and decrease the opening force. The butterfly element moves toward the closed position to decrease downstream pressure. When downstream pressure decreases, the bleed-off device closes to increase the control pressure to the actuator opening chamber and increase the opening force. The butterfly element moves to the open position to increase the downstream pressure.

在调节模式下，排气装置调节活门开启腔的控制压力，以根据所需的下游压力定位蝶板元件。当下游压力增加时，排气装置打开，以排出控制压力并减小开启力。蝶板元件向关闭位置移动，以降低下游压力。当下游压力降低时，排气装置关闭，以增加流向作动器开启腔的控制压力并增加开启力。蝶板元件移动到打开位置，以增加下游压力。

(5) (Codes A, B) Refer to Figure 2 modulating and shutoff valve schematic.

（代码 A、B）请参见图 2 调节和关断活门原理图。

(6) (Codes C-F) Refer to Figure 3 modulating and shutoff valve schematic

（代码 C-F）请参见图 3 调节和关断活门原理图。

八、工作参数

九、在飞机系统中的工作原理及互联

The MSOV is a pneumatically-operated butterfly valve that controls airflow to the Turbine gearbox assembly (TGA). A pneumatic actuator moves the butterfly valve.

The MSOV normally operates as a two position valve, either full open or full closed. When the MSOV is open, it supplies the airflow to the turbine. The MSOV pneumatic actuator modulates the butterfly valve position during secondary speed control. A position indicator on the MSOV shows the position of the butterfly valve. The MSOV attaches to the TGA with a V-band clamp. The MSOV also attaches with a V-band clamp to the inlet isolator. The inlet isolator decreases the vibration and noise from the ADP assembly. The inlet duct attaches to the inlet isolator with a Vband clamp.

MSOV是一种气动作动的活门，用于控制流向涡轮齿轮箱总成(TGA)的气流。气动作动器作动蝶板。

MSOV通常为两个位置，全开或全关。当MSOV打开时，它向涡轮提供气流。MSOV气动作动器在二级速度控制期间调节蝶板位置。

MSOV上的位置指示器显示蝶板的位置。

MSOV通过V形卡箍连接到TGA。MSOV还通过一个V形卡箍连接到入口隔离器上。进口隔离器可降低ADP组件的振动和噪音。进气管通过V形卡箍连接到进气隔离器上。

Air flows through the MSOV to the turbine gearbox assembly (TGA). The TGA turns the ADP hydraulic pump. The LSCU supplies primary speed control and overspeed protection.

空气通过MSOV流向涡轮齿轮箱总成（TGA）。TGA转动ADP液压泵。LSCU提供主速度控制和超速保护。