These valves are mounted in order to protect the accumulator in case of gas overpressures higher than the value of the maximum allowable working pressure. So the calibration of the valve must be equal or lower than this value. Flow rate regulators.
Model
VSA 18 - VSA 21 - VSA 34 - VS21 - VS34 - VS210 - VS212 - VS214 - VS234 - VS238 - NS15 - NS21 - VS18/M33-12 - VS18/M33-18 - VS18/SAE8 - VS18/SAE12