The US Department of Energy, Morgantown Energy Technology Center (METC) has been designated the lead center for the development and testing of components for coal conversion and utilization applications, and has been active for the past several years in the development and testing of valves, coal extruders, and gas cleanup systems. METC has initiated new valve test and development projects. This test plan covers a valve for slurry letdown service in a coal liquefaction plant. 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 at an existing pilot plant facility or in special, small scale test loops. Included in this document are the program objectives, a description of the tests, and the facility functional requirements criteria delineated as follows: operational requirements, operating personnel requirements, maintenance requirements, equipment requirements, instrumentation and data recording requirements, utility requirements, and transportation/storage requirements.