![]() ![]() Note that the built-up backpressure limitations discussed above do not necessarily apply to valves with open bonnet design due to the nature of their design. When the backpressure is expected to exceed these specified limits, a balanced or pilot-operated PRV should be specified. When the downstream piping is designed within the above backpressure criteria, no backpressure capacity correction (Kb = 1.0) is required in the valve sizing equations, for gases at critical flow or for liquids. ![]() When the superimposed backpressure is constant, the spring load may be reduced to compensate for the superimposed backpressure. Another example is a nonfire case where two valves are installed with one PRV set at MAWP and one set at 1.05 times MAWP the built-up backpressure should not exceed 16% and 10% of the respective set pressures. ![]()
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