Globe valve, air-open valve, air-close valve

If I had to choose, I would keep choosing D for the gate valve. For air on valves and air off valves, choose option A for the maximum value. It can be confirmed that gate valves remain unchanged; they have no installation direction, and the pressure drop loss is low when they are fully open at full diameter. The air valve should be a ventilation butterfly valve; once the valve core is removed, the cross-sectional area of the valve chamber increases, similar to that of a fully open gate valve.

I have a few questions; thank you! Do air shut-off and air on control valves refer to “pneumatic control valves”? Does \"valve core falling\" refer to the valve core coming loose or its state when it is closed? It seems that some nouns need to be standardized; it would be best if they could be found in textbooks, otherwise it becomes difficult to search through various materials. It’s even more difficult to talk about when it appears on the exam papers. For reference.

The answer is yes. The gate valve is at zero. The wind valve is at zero, and it’s at maximum when open. It’s strange

\"Wind on\" means fault off, and \"Wind off\" means fault on, right? What does it mean for the gate valve to reverse direction? I really don’t understand this

1. Question: When a gate valve is reversed, the flow rate ( ) A. reaches its maximum B. decreases C. returns to zero D. remains unchanged； Answer: The gate valve is closed, and the flow rate C becomes zero ； 2. Question ； The spool of the wind valve control valve has fallen off; flow rate: A maximum, B reduced, C back to zero, D unchanged ； Answer ； Air shut-off control valve: the valve closes when air is supplied, and it opens in case of a failure resulting in a loss of air pressure; flow rate A is the highest ； 3. Question: When the spool of the wind-open control valve falls, the flow rate () A increases B decreases C returns to zero D remains unchanged ； Answer: The valve is controlled by air pressure; it opens when air is supplied and closes in the event of a pressure loss, causing the flow rate C to return to zero. To be honest, I don’t understand what you’re saying; I’m just guessing. What drives the opening and closing of valves is air pressure, compressed air – it’s not wind. What valve core has fallen off? Why did the valve core fall off without any reason? When improving knowledge of valves, it is also necessary to enhance overall knowledge levels and communication skills; otherwise, one will not be able to express oneself clearly, which creates obstacles to communication.