单项选择题
A(n) （） is a special type of valve which prevents the passage of steam but allows condensate to pass.
A.check valve
B.non-return valve
C.steam trap
D.quick closing trap
点击查看答案&解析
相关考题
-
单项选择题
Fuel oil tanks must be fitted with （） that can be closed rapidly and remotely in the event of an emergency such as a fire.
A.stop valves
B.non-return valves
C.quick closing valves
D.relief valves -
单项选择题
A more sophisticated pressure reducing valve incorporates a pilot valve which controls the fluid above the valve operating piston in response to downstream pressureThe bold and italic word “which” means （）.
A.a pressure reducing valve
B.a pilot valve
C.an operating piston
D.downstream pressure -
单项选择题
In its simplest form the pressure reducing valve is opened or closed by （） which is balanced by the downstream pressure acting on a diaphragm.
A.adjusting a nut
B.a pre-tensioned spring
C.any spring
D.upstream pressure
