METC has initiated new valve test and development projects. This test plan covers a hot, dirty gas valve used for back pressure or flow control in a coal gasification or combined-cycle facility. Since large-scale (commercial size) testing facilities do not exist, and would be very expensive and time-consuming to construct, this test plan assumes that valves will be tested in relatively small-scale test loops. Included in this document are the program objectives, a description of the tests, and the facility functional requirements criteria.