Design issues of oxygen pipeline valves
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Why do the valves on pipelines for industrial oxygen (99.5% or higher) have bypass valves, while the valves on pipelines for high-purity oxygen (99.99999% or higher) do not have bypass valves? The pipe diameters of the two are the same (DN200).
The design of the bypass valve is based on process requirements and investment considerations; there are no mandatory specifications
The larger the pipe diameter, the lower the safety factor of the control valve. Installing a bypass charging valve to reduce the pressure on both sides of the valve, thereby decreasing the pressure difference and flow rate, is the best approach to improving the safety factor. But what is mentioned here is reducing the pressure difference; in cases where it is not possible to reduce the pressure difference, it is recommended to use multiple valves with small diameters for control. Large-diameter valves used for pressure regulation control in ordinary steel enterprises require explosion-proof walls to be installed, and valve stems that pass through these walls are used to enable operation control.