Turning the valve back a couple of turns after fully opening it, and turning it back a couple of turns after closing it completely – does this provide any protective effect? What principle? Please provide the structure diagram
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Is it beneficial to turn the valve back a couple of turns after opening it fully, or after closing it completely? What principle? Please provide the structure diagram
Turning it back a couple of turns after shutting it off is mainly to prevent death due to swelling caused by rising temperature, as well as to avoid damaging the connection of the valve core if the valve is opened too tightly.
Turning the valve back one or two turns after fully opening it is to prevent the valve stem from coming loose from its track, so that it cannot function when closing.
It provides protection to prevent the fully open valve element from coming off its track
This seemingly simple procedure has its own principles behind it; once you learn them, you’ll see how profound and complex they are.
I’m hearing about this technique for the first time – will it cause leaks if I push it all the way in and then turn it around?
If it goes back two rounds like this, can it be completely shut off? Hehe. . . If a flow meter needs to be disassembled for maintenance, the valves located before and after the flow meter should be turned clockwise two times to ensure no leaks – but sometimes they get stuck in that position, and even with a pressure rod used to close them, leaks still occur. Turning them clockwise two times really makes no sense.
It misleads people into thinking they have learned something; these two rotations are relative to when everything is turned on, not when everything is turned off. If everything is turned off, making two rotations can sometimes be fatal.
The content of the title is nonsense based on a superficial understanding; definitely do not treat it as practical experience to follow. In some cases, it is necessary to turn the valve fully according to the length of the valve stem – it might be two turns, half a turn, or even 1/4 of a turn. This is done to prevent accidental further opening of the valve, which could cause the valve stem to move out of its track and prevent the valve from closing. For ordinary people, by feeling a slight amount of force and observing how it changes when it reaches full force, they can tell when the operation is complete and need to turn it back a bit. Once fully closed, it cannot be reversed; if reversed, leakage will occur