Hydrogen vent valve control valve
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I have been ordering a hydrogen vent control valve recently; the pressure before the valve is 5 MPa and the pressure after it is 0.1 MPa. According to the standards for hydrogen stations, the pipeline flow velocity should be 25 m/s for stainless steel pipes at pressures below 3 MPa, but the flow velocity in the vent line definitely exceeds this value, reaching 133 m/s. However, the hydrogen station standards do not specify any requirements regarding the flow velocity of vent valves. How do you guys handle this issue?
Are the diameters the same before and after the valve? Shouldn’t there be a larger diameter change after the valve?
The flow velocity at the flange outlet is as such; it may change after exiting
We referred to the EIGA design. H2 has no specific flow rate limit. Control the outlet flow rate of the regulating valve to control noise. If the flow rate is high enough to cause noise levels to exceed 110, it is recommended to install a silencer after the valve in order to reduce the pressure drop by 10 BAR ； The vent pipe behind the valve should be made of stainless steel. Similarly, for orifice plates, vortex meters, and mass flow meters, there are no special requirements regarding the material in contact with the fluid.