Some issues with safety valves
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1. What is the relationship between the discharge pressure and the return pressure of a safety valve? What are the consequences if the return pressure is greater than the discharge pressure? 2. When in use on-site, can a plastic cover be added externally to protect the safety valve?
Is it seat-back pressure? How can the return pressure be greater than the discharge pressure? Discharge pressure > Opening pressure > Return pressure
1. If the return pressure is higher than the discharge pressure, what use is that safety valve then, since it cannot activate to relieve pressure and protect the equipment? 2. The safety valves here are all exposed to the air, with no protection; there’s probably no need for protection anyway. There’s no need for such complexity.
1. It’s not a problem at all; the safety valve just needs to have its pressure set according to the actual requirements of production； The safety valve manufacturer can provide them based on other medium requirements ； 2. As for adding protection, it’s of course better to have protection when outdoors.
Knowledge about safety valves needs to be improved
What he meant was probably the vent pipe; in some cases, direct discharge of such vents is not allowed, and the vent pipe must be connected to an exhaust gas treatment system
Question 1: Do you mean the return pressure by backpressure? Generally, for safety valves, the discharge pressure is greater than the opening pressure and greater than the return pressure. Question 2: It can be appropriately considered based on the installation environment of the safety valve, but the protective cover should not affect the valve’s operation in case of overpressure
The discharge pressure needs to be high; otherwise, how can it launch? Generally, no protection is needed, right?
Can the safety valve still open if the backpressure is greater than the discharge pressure? It’s okay to add a protective cover, but it must not block the exit; otherwise, it could be crushed, which is not allowed!