Rockwell Coal Lock Hopper Valve: METC SOA Test Valve No. A-16. State-of-the-ART Lock Hopper Valve Testing and Development Project. Summary Test Report

摘要

The Rockwell Lock Hopper Valve, METC Test Valve No. A-16, has accumulated over 1000 operating cycles in the Valve Static Test Unit and over 8500 operating cycles in the Valve Dynamic Test Unit. Valve performance with a test media of coarse (less than 1/4 inch but 90 percent retained on 16 mesh) limestone, indicates good potential for solids handling lock hopper service. Operating problems were encountered with fine, caking limestone. Some sealing problems, requiring opening and reclosing the valve, and the seat damage observed show that improvements are needed in the seat design and/or seat purge system. The valve's maintainability was demonstrated by removing the body seat and the disk and refacing them. Valve performance after rework was comparable to initial performance. (ERA citation 05:033184)