Vent valve nameplate
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On the nameplate of the flame-retardant breathing valve, the pressure value is indicated as 0.6 CMpa; what does the letter C stand for? I ask all the experts to refrain from giving advice.
0.6 represents the nominal pressure class of the valve flange. C is the initial set pressure rating of the valve. The initial setting pressure of this ZFQ-II type all-weather explosion-proof flame arrestor breather valve is divided into three grades: A, B, and C. Class A: Positive pressure 355 Pa (36 mm H2O), negative pressure 295 Pa (30 mm H2O) ； Grade B: Positive pressure of 980 Pa (100 mm water column), negative pressure of 295 Pa (30 mm water column) ； Class C: Positive pressure of 1765 Pa (180 mmH2O), negative pressure of 295 Pa (30 mmH2O).
I only remember three categories: negative pressure is the same in all cases, while positive pressure depends on the respiration rate of the substances inside the tank and on nitrogen sealing
Which type of breathing valve do you use? Which brand offers the best breathing valves?