‘Conventional’ valves are highly susceptible to this effect and hence not used in applications where high backpressure is expected. When the relief valve is discharging, effects of superimposed and built-up back pressure exist together and felt as the combined back pressure.įor certain relief valve designs, the backpressure on the valve acts as a closing force and can affect the opening pressure for the valve.
The built-up backpressure is the pressure in the vent header plus pressure drop in the line from relief valve to vent header, when the valve is discharging at full capacity.
This pressure depends on the pressure of the vent header downstream to the relief valve and the relieving flowrate which is being discharged. Built-up back pressure is the backpressure generated due to pressure losses at the outlet of an open relief valve when it is discharging.
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