Is it meaningful to install a root valve on the oxygen safety valve?
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The oxygen pipeline is not equipped with a safety valve to prevent overpressure; if a manual valve is installed at the pipeline’s starting point, could there be a risk of the oxygen flow rate becoming too high due to the large pressure difference and high flow velocity when the safety valve activates and the manual valve is closed, thereby triggering an accident?
The safety valve activates; accidents are more likely to occur if the backflow piping is not properly installed, right?
Safety valves for gases such as oxygen are generally designed to open fully; after discharge, they return to their original position and do not remain in the open state
Before closing the manual valve, it is necessary to ensure that the safety valve has returned to its seat and that there is no excessive flow rate. If the safety valve has not returned to its original position, it indicates that the pressure is still too high; in such a case, the manual valve must not be closed.
If the safety valve opens and then returns to its original position once the pressure drops, it’s not a problem; that’s normal behavior. Once the safety valve activates and the pressure returns to normal, but the valve does not return to its original position, this indicates that the safety valve is faulty. Should the shut-off valve be closed or left open?
The super-flow rate you mentioned should indeed exist, especially when the pressure is reduced from high levels to normal levels. The materials used for this pipe section and its accessories fall within the category of materials exempt from certain restrictions. If the safety valve does not return to its original position, it is necessary to ensure that the pressure at the source can be controlled; otherwise, it will be problematic if the pressure rises again after the manual valve is closed
From a safety perspective, it can’t be turned off either... but in practice, it’s likely that people will turn it off anyway: funk:
What is the likelihood of a malfunction causing the safety valve to fail?
I just came to take a look and learn a thing or two along the way.
The safety valve opens in order to release pressure, and it closes again when the pressure returns to normal. If the manual valve is closed at that moment, then what’s the purpose of the safety valve? Its function is to be able to open on its own as well as to close again
Then several extreme scenarios can be considered: 1. The safety valve fails to return to its seat after activating, but the pressure has been brought under control and remains within acceptable parameters. 2. What if the safety valve becomes ineffective, causing internal leakage or opening automatically during stable operation?