When the air shutoff valve stops the wind, it should be treated at the scene ( ).

The common English letter for manual adjustment is ( ).

When manually adjusting the instrument of the positive action, gas shutoff valve, increasing the output value, the field control valve opening will be ( ).

When the fluid flows through the ram, it does not change the flow direction, and the resistance is ( ).

The "Z" in valve model Z41H-25 DN100 means ( ).

The following are not gate valve features are ( ).

The ( ) function of gate valve is mainly used in practical application.

The ( ) function of the globe valve is mainly used in practical applications.

The globe valve generally comes in the form of straight-through, ( ), Y-shaped straight flow, needle valve, etc.

The following are not shut-off valve features ( ).

The throttle performance of the stop valve will deteriorate when the diameter of the pipe is ( ).

The main function of the trap is ( ).

Traps are usually installed at ( ).

Thermostatic trap The ( ) of the medium controls the opening and closing of the trap.

The valve that automatically acts to block steam drainage is ( ).