Sequence valve can be used as relief valve. ( )

Direct acting relief valve is often used as the pilot valve of safety valve or other pilot relief valve. ( )

All ground spoilers are powered by hydraulic system _____ through a control valve and a bypass valve.

In order to ensure that the pressure difference between the front and rear of the throttle valve remains unchanged when the load changes, the flow through the throttle valve is basically unchanged. The throttle valve is often connected with ( ) to form a speed control valve, or the throttle valve and ( ) are connected in parallel to form a bypass speed control valve. A: Pressure reducing valve B: constant pressure reducing valve C: overflow valve D: differential pressure relief valve

在轮胎充气活门上安装轮胎充气适配头和压力表。 A: Install the tire inflating valve and pressure gauge upstream of the tire inflating adapter. B: The tire inflation valve and pressure gauge are respectively installed at both ends of the tire inflation adapter head. C: Installthe tire inflation adaptor and pressure gage on the tire inflation valve.

Incorrect assembly of the seal will result in leaks the valve. A: If you install the<br/>seal incorrectly, leaks can occur around the valve. B: Incorrect assembly of the seal will result in leaks past the valve. C: If you install the<br/>seal incorrectly, leaks can occur surrounding the valve.

A throttle valve is a simple flow control valve, a throttle valve is virtually equal to( ).

The word "valvulotome" means _______________. A: incision of a valve B: an opening of the valve C: an instrument for cutting a valve D: surgical repair of a valve

The commonly used pressure control valve in hydraulic transmission system is ( ) A: directional valve B: relief valve C: hydraulic control check valve

Which of the following hydraulic control valves belongs to pressure control valve （ ）. A: Unloading valve B: overflow throttle valve C: Hydraulic control check valve D: Low pressure selector valve