I'm not exactly sure if your problem is with the mud accumulating in the nozzle of the valve before it has relieved or if it is with the mud after the valve has relieved. If the problem is with mud accumulating in the nozzle before a relief event then a rupture disc may be the answer. Another solution may be a flush seated. This can resolve the problem of mud accumulating with the ball valve closed but will not resolve a problem once the valve opens. Flush seated valve are used in the polymer industry where the solidified polymor will clog nozzle type valves. A company called FEMA located in Italy makes flush seated valves. It is understood that once the pressure relief valve opens it must be removed from the system and cleaned. Deposits of solids are a problem in a few industries such as in the production of polymer and in the production of bauxite. Clogged pressure relief valves have been a problem at several aluminium production facilities. Solutions to these problems are not always easy.

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