The heating furnace chimney mainly acts on air and flue gas.

The gate valve's gate plate is driven by the valve stem along the sealing surface of the seat to do ( ) movement, thereby controlling the flow of the medium.

For a dark stem gate valve, the gate opens and closes with the stem ( ).

For open-stem gate valves, the gate opens and closes with the stem ( ).

The disc of the globe valve is ( ).

The fluid inlet and outlet form a ( ) Angle when the medium passes through the Angle globe valve.

The disadvantage of the globe valve is that the structure is complex and the price is expensive, ( ).

The globe valve is a ( ) valve.

Mechanical traps work with ( ) of steam and condensate.

A trap that operates on the difference in temperature between condensate and steam is ( ).

When installing a mechanical type trap, its body must be ( ) installed.

A trap that operates on the difference in density between condensate and steam is ( ).

On a pressure vessel for gases that do not pollute the environment, the relief valve where the discharged gas partially passes through the exhaust pipe and partially escapes through the gap between the bonnet and stem is ( ).

For containers where the working medium is toxic or flammable gases, ( ) should be selected.

The relief valve where the discharged gas is discharged directly above the disc into the surrounding atmospheric space is ( ).